Mercurial > evolve

--- a/README	Wed Jul 30 13:38:33 2014 -0700
+++ b/README	Wed Jul 30 13:40:40 2014 -0700
@@ -29,9 +29,19 @@
 ==========

 The simplest way to contribute is to issue a pull request on Bitbucket
-(https://bitbucket.org/marmoute/mutable-history). Please don't forget
-to update and run the tests when you fix a bug or add a feature. To
-run the tests:
+(https://bitbucket.org/marmoute/mutable-history). Alternatively, you
+can use the patchbomb extension to send email to mercurial
+devel. Please make sure to use the evolve-ext flag when doing so. You
+can use a command like this:
+
+    hg email --to mercurial-devel@selenic.com --flag evolve-ext --rev '<your patches>'
+
+See also
+http://mercurial.selenic.com/wiki/ContributingChanges#Patch_descriptions
+for guidelines on the patch description.
+
+Please don't forget to update and run the tests when you fix a bug or
+add a feature. To run the tests:

     cd tests
     python run-tests.py --with-hg=/path/to/hg
@@ -47,6 +57,16 @@
 Changelog
 =========

+4.1.0 --
+
+- amend: add -D/--current-date option
+- amend: add -U/--current-user option
+- evolve: add a --tool option
+- mark "commit -o", "graft -o" and "graft -O" as deprecated since they are
+  unlikely to eventually make it into core.
+- push obsmarkers and phases in the same transaction than changesets
+  (when using hg >= 3.1 and bundle2-exp is enabled)
+
 4.0.0 -- 2014-06-03

 - require Mercurial version 3.0.1 or above
--- a/debian/rules	Wed Jul 30 13:38:33 2014 -0700
+++ b/debian/rules	Wed Jul 30 13:40:40 2014 -0700
@@ -18,6 +18,7 @@
 	dh_python2

 clean: clean-docs
+	rm -f tests/*.err

 clean-docs:
 	rm -rf html
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/concepts.rst	Wed Jul 30 13:40:40 2014 -0700
@@ -0,0 +1,223 @@
+.. Copyright 2014 Greg Ward <greg@gerg.ca>
+
+----------------
+Evolve: Concepts
+----------------
+
+Getting the most out of software requires an accurate understanding of
+the concepts underlying it. For example, you cannot use Mercurial to
+its full potential without understanding the DAG (directed acyclic
+graph) of changesets and the meaning of parent/child relationships
+between nodes in that graph. Mercurial with changeset evolution adds
+some additional concepts to the graph of changesets. Understanding
+those concepts will make you an informed and empowered user of
+``evolve``.
+
+.. note:: This document contains math! If you have a pathological fear
+          of set theory and the associated notation, you might be
+          better off just reading the `user guide`_. But if you
+          appreciate the theoretical rigour underlying core Mercurial,
+          you will be happy to know that it continues right into
+          changeset evolution.
+
+.. note:: This document is incomplete! (The formatting of the math
+          isn't quite right yet, and the diagrams are missing for
+          malformatted.)
+
+This document follows standard set theory notation:
+
+  x ∈ A: x is a member of A
+
+  A ∪ B: union of A and B: { x | x ∈ A or x ∈ B }
+
+  A ∖ B: set difference: { x | x ∈ A and x ∉ B }
+
+  A ⊇ B: superset: if x ∈ B, then x ∈ A
+
+.. _`user guide`: user-guide.html
+
+Phases
+------
+
+First, every changeset in a Mercurial repository (since 2.3) has a
+*phase*. Phases are independent of ``evolve`` and they affect
+Mercurial usage with or without changeset evolution. However, they
+were implemented in order to support evolution, and are a critical
+foundation of ``evolve``.
+
+Phases are strictly ordered:
+
+  secret > draft > public
+
+Changesets generally only move from a higher phase to a lower phase.
+Typically, changesets start life in *draft* phase, and move to
+*public* phase when they are pushed to a public repository. (You can
+set the default phase of new commits in Mercurial configuration.)
+
+The purpose of phases is to prevent modifying published history.
+``evolve`` will therefore only let you rewrite changesets in one of
+the two *mutable* phases (secret or draft).
+
+Run ``hg help phases`` for more information on phases.
+
+Obsolete changesets
+-------------------
+
+*Obsolescence* is they key concept at the heart of changeset
+evolution. Everything else in this document depends on understanding
+obsolescence. So: what does it mean for a changeset to be obsolete?
+
+In implementation terms, there is an *obsolescence marker* associated
+with changesets: every changeset is either obsolete or not.
+
+The simplest way that a changeset becomes obsolete is by *pruning* it.
+The ``hg prune`` command simply marks the specified changesets
+obsolete, as long as they are mutable.
+
+More commonly, a changeset *A* becomes obsolete by *amending* it.
+Amendment creates a new changeset *A'* that replaces *A*, which is now
+obsolete. *A'* is the successor of *A*, and *A* the predecessor of *A'*:
+
+  [diagram: A and A' with pred/succ edge]
+
+The predecessor/successor relationship forms an additional
+*obsolescence graph* overlaid on top of the traditional DAG formed by
+changesets and their parent/child relationships. In fact, the
+obsolescence graph is second-order version control. Where the
+traditional parent/child DAG tracks changes to your source code, the
+obsolescence graph tracks changes to your changesets. It tracks the
+evolution of your changesets.
+
+(If you prefer a calculus metaphor to set theory, it might help to
+think of the traditional parent/child DAG as the first derivative of
+your source code, and the obsolescence DAG as the second derivative.)
+
+Troubled changesets (unstable, bumped, divergent)
+-------------------------------------------------
+
+Evolving history can introduce problems that need to be solved. For
+example, if you prune a changeset *P* but not its descendants, those
+descendants are now on thin ice. To push a changeset to another
+repository *R*, all of its ancestors must be present in *R* or pushed
+at the same time. But Mercurial does not push obsolete changesets like
+*P*, so it cannot push the descendants of *P*. Any non-obsolete
+changeset that is a descendant of an obsolete changeset is said to be
+*unstable*.
+
+  [diagram: obsolete cset with non-obsolete descendant]
+
+Another sort of trouble occurs when two developers, Alice and Bob,
+collaborate via a shared non-publishing repository. (This is how
+developers can safely `share mutable history`_.) Say Alice and Bob
+both start the day with changeset *C* in *draft* phase. If Alice
+pushes *C* to their public repository, then it is now published and
+therefore immutable. But Bob is working from a desert island and
+cannot pull this change in *C*'s phase. For Bob, *C* is still in draft
+phase and therefore mutable. So Bob amends *C*, which marks it
+obsolete and replaces it with *C'*. When he is back online and pulls
+from the public repository, Mercurial learns that *C* is public, which
+means it cannot be obsolete. We say that *C'* is *bumped*, since it is
+the successor of a public changeset.
+
+.. _`share mutable history`: sharing.html
+
+(Incidentally, the terminology here comes from airline overbooking: if
+two people have bought tickets for the same seat on a plane and they
+both show up at the airport, only one of them gets on the plane. The
+passenger who is left behind in the airport terminal has been
+"bumped".)
+
+The third sort of trouble is when Alice and Bob both amend the same
+changeset *C* to have different successors. When this happens, the
+successors are both called *divergent* (unless one of them is in
+public phase; only mutable changesets are divergent).
+
+The collective term for unstable, bumped, and divergent changeset is
+*troubled*:
+
+  troubled = unstable ∪ bumped ∪ divergent
+
+It is possible for a changeset to be in any of the troubled categories
+at the same time: it might be unstable and divergent, or bumped and
+divergent, or whatever.
+
+  [diagram: Venn diagram of troubled changesets, showing overlap]
+
+The presence of troubled changesets indicates the need to run ``hg
+evolve``.
+
+Hidden (and visible) changesets
+-------------------------------
+
+Some obsolete changesets are *hidden*: deliberately suppressed by
+Mercurial and usually not visible through the UI. (As of Mercurial
+2.9, there are still some commands that inadvertently reveal hidden
+changesets; these are bugs and will be fixed in due course.)
+
+All hidden changesets are obsolete, and all obsolete changesets are
+part of your repository. Mathematically speaking:
+
+  repo ⊇ obsolete ⊇ hidden
+
+Or, putting it visually:
+
+  [diagram: Venn diagram showing nested strict subsets]
+
+However, the presence of obsolete but not hidden changesets should be
+temporary. The desired end state for any history mutation operation is
+that all obsolete changesets are hidden, i.e.:
+
+  repo ⊇ obsolete, obsolete = hidden
+
+Visually:
+
+  [diagram: Venn diagram showing obsolete = hidden, subset of repo]
+
+
+Why is this changeset visible?
+------------------------------
+
+Any changeset which is not hidden is *visible*. That is,
+
+  visible = repo ∖ hidden
+
+(Recall that ∖ means set difference: *visible* is the set of
+changesets that are in *repo* but not in *hidden*.)
+
+After amending or pruning a changeset, you might expect it to be
+hidden. It doesn't always work out that way. The precise rules are:
+
+  hideable = obsolete
+  blockers = bookmarks ∪ parents(workingcopy) ∪ localtags
+  hidden = hideable ∖ ancestors((repo ∖ hideable) ∪ blockers)
+
+This will probably be clearer with a worked example. First, here's a
+repository with some obsolete changesets, some troubled changesets,
+one bookmark, a working copy, and some hidden changesets:
+
+        x-x
+       /
+  -o-o-o-o
+     \
+      x-x-o
+
+Here's the computation required to determine which changesets are
+hidden:
+
+  repo = { 0, 1, 2, 3, 4, 5, 6, 7, 8 }
+
+  hideable = obsolete = { 2, 4, 5, 8 }
+
+  blockers = { 6 } ∪ { 4 } ∪ {}
+
+  blockers = { 4, 6 }
+
+  hidden = hideable ∖ ancestors((repo ∖ { 2, 4, 5, 8 }) ∪ { 4, 6 })
+
+  hidden = hideable ∖ ancestors({ 0, 1, 3, 6, 7 } ∪ { 4, 6 })
+
+  hidden = hideable ∖ ancestors({ 0, 1, 3, 4, 6, 7 })
+
+  hidden = { 2, 4, 5, 8 } ∖ { 0, 1, 2, 3, 4, 5, 6, 7 }
+
+  hidden = { 8 }
--- a/docs/conf.py	Wed Jul 30 13:38:33 2014 -0700
+++ b/docs/conf.py	Wed Jul 30 13:40:40 2014 -0700
@@ -12,8 +12,8 @@
 master_doc = 'index'

 # General substitutions.
-project = 'Obsolete experimentation'
-copyright = '2010-2011, pierre-yves.david@logilab.fr'
+project = 'evolve extension for Mercurial'
+copyright = '2010-2014, Pierre-Yves David, Greg Ward, and contributors'

 # The default replacements for |version| and |release|, also used in various
 # other places throughout the built documents.
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--- a/docs/index.rst	Wed Jul 30 13:38:33 2014 -0700
+++ b/docs/index.rst	Wed Jul 30 13:40:40 2014 -0700
@@ -1,166 +1,105 @@
-.. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
-..                Logilab SA        <contact@logilab.fr>
-
-========================================
-Changeset Evolution Experimentation
-========================================
-
+.. Copyright © 2014 Greg Ward <greg@gerg.ca>

-This is the online documentation of the `evolve extension`_. An experimental
-extension that drive the implementation of the `changeset evolution concept`_ for
-Mercurial.
+==================================
+Changeset Evolution with Mercurial
+==================================

-.. _`evolve extension`: http://mercurial.selenic.com/wiki/EvolveExtension
-.. _`changeset evolution concept`: http://mercurial.selenic.com/wiki/ChangesetEvolution
+`evolve`_ is an experimental Mercurial extension for safe mutable history.

-Here are various materials on planned improvement to Mercurial regarding
-rewriting history.
+.. _`evolve`: http://mercurial.selenic.com/wiki/EvolveExtension

-First, read about what challenges arise while rewriting history and how we plan to
-solve them once and for all.
-
-.. toctree::
-   :maxdepth: 2
-
-   instability
-
-The effort is split in two parts:
+With core Mercurial, changesets are permanent and immutable. You can
+commit new changesets to modify your source code, but you cannot
+modify or remove old changesets—they are carved in stone for all
+eternity.

- * The **obsolescence marker** concept aims to provide an alternative to ``strip``
-   to get rid of changesets. This concept has been partially implemented since
-   Mercurial 2.3.
+For years, Mercurial has included various extensions that allow
+history modification: ``rebase``, ``mq``, ``histedit``, and so forth.
+These are useful and popular extensions, and in fact history
+modification is one of the big reasons DVCSes (distributed version
+control systems) like Mercurial took off.

- * The **evolve** Mercurial extension rewrites history using obsolete
-   *marker* under the hood.
-
-The first and most important step is by far the **obsolescence marker**. However
-most users will never be directly exposed to the concept. For this reason
-this manual starts with changeset evolution.
+But there's a catch: until now, Mercurial's various mechanisms for
+modifying history have been *unsafe*, in that changesets were
+destroyed (“stripped”) rather than simply made invisible.

-Evolve: A robust alternative to MQ
-====================================
-
-Evolve is an experimental history rewriting extension that uses obsolete
-markers. It is inspired by MQ and pbranch but has multiple advantages over
-them:
-
-* Focus on your current work.
+``evolve`` makes things better in a couple of ways:

-    You can focus your work on a single changeset and take care of adapting
-    descendent changesets later.
-
-* Handle **non-linear history with branches and merges**
+  * It changes the behaviour of most existing history modification
+    extensions (``rebase``, ``histedit``, etc.) so they use a safer
+    mechanism (*changeset obsolescence*, covered below) rather than
+    the older, less safe *strip* operation.

-* Rely internally on Mercurial's **robust merge** mechanism.
+  * It provides a new way of modifying history that is roughly
+    equivalent to ``mq`` (but much nicer and safer).

-  Simple conflicts are handled by real merge tools using the appropriate ancestor.
-  Conflicts are much rarer and much more user friendly.
+It helps to understand that ``evolve`` builds on infrastructure
+already in core Mercurial:

-*  Mutable history **fully available all the time**.
-
-  Always use 'hg update' and forget about (un)applying patches to access the
-  mutable part of your history.
-
-
-* Use only **plain changesets** and forget about patches. Evolve will create and
-  exchange real changesets. Mutable history can be used in all usual operations:
-  pull, push, log, diff, etc.
+  * *Phases* (starting in Mercurial 2.1) allow you to distinguish
+    mutable and immutable changesets. We'll cover phases early in the
+    user guide, since understanding phases is essential to
+    understanding ``evolve``.

-* Allow **sharing and collaboration** mutable history without fear of duplicates
-  (thanks to obsolete marker).
-
-* Cover all MQ usage but guard.
-
-.. warning:: The evolve extension and obsolete markers are at an experimental
-             stage. While using obsolete you willl likely be exposed to complex
-             implications of the **obsolete marker** concept. I do not recommend
-             non-power users to test this at this stage.
+  * *Changeset obsolescence* (starting in Mercurial 2.3) is how
+    Mercurial knows how history has been modified, specifically when
+    one changeset replaces another. In the obsolescence model, a
+    changeset is neither removed nor modified, but is instead marked
+    *obsolete* and typically replaced by a *successor*. Obsolete
+    changesets usually become *hidden* as well. Obsolescence is an
+    invisible feature until you start using ``evolve``, so we'll cover
+    it in the user guide too.

-             While numbered 1.0.0, the command line API of this version should
-             **not** be regarded as *stable*: command behavior, name and
-             options may change in future releases or once integrated into
-             Mercurial. It is still an immature extension; a lot of
-             features are still missing but there is low risk of
-             repository corruption.
-
-             Production-ready version should hide such details from normal users.
+Some of the things you can do with ``evolve`` are:

-The evolve extension requires Mercurial 2.5 (older versions supports down to 2.2)
-
-To enable the evolve extension use::
-
-    $ hg clone https://bitbucket.org/marmoute/mutable-history -u stable
-    $ echo '[extensions]\nevolve=$PWD/mutable-history/hgext/evolve.py' >> ~/.hgrc
-
-You will probably want to use hgview_ to visualize obsolescence. Version 1.7.1
-or later is required.
-
-.. _hgview: http://www.logilab.org/project/hgview/
+  * Fix a mistake immediately: “Oops! I just committed a changeset
+    with a syntax error—I'll fix that and amend the changeset so no
+    one sees my mistake.” (While this is possible using existing
+    features of core Mercurial, ``evolve`` makes it safer.)

-
- ---
-
-For more information see the documents below:
-
-.. toctree::
-   :maxdepth: 1
+  * Fix a mistake a little bit later: “Oops! I broke the tests three
+    commits back, but only noticed it now—I'll just update back to the
+    bad changeset, fix my mistake, amend the changeset, and evolve
+    history to update the affected changesets.”

-   tutorials/tutorial
-   evolve-good-practice
-   evolve-faq
-   from-mq
-   evolve-collaboration
-   qsync
+  * Remove unwanted changes: “I hacked in some debug output two
+    commits back; everything is working now, so I'll just prune that
+    unwanted changeset and evolve history before pushing.”

-Smart changeset deletion: Obsolete Marker
-==========================================
-
-The obsolete marker is a powerful concept that allows Mercurial to safely handle
-history rewriting operations. It is a new type of relation between Mercurial
-changesets that tracks the result of history rewriting operations.
+  * Share mutable history with yourself: say you do most of your
+    programming work locally, but need to test on a big remote server
+    somewhere before you know everything is good. You can use
+    ``evolve`` to share mutable history between two computers, pushing
+    finely polished changesets to a public repository only after
+    testing on the test server.

-This concept is simple to define and provides a very solid base for:
-
-- very fast history rewriting operations
-
-- auditable and reversible history rewriting process
-
-- clean final history
-
-- share and collaborate on mutable parts of the history
+  * Share mutable history for code review: you don't want to publish
+    unreviewed changesets, but you can't block every commit waiting
+    for code review. The solution is to share mutable history with
+    your reviewer, amending each changeset until it passes review.

-- gracefully handle history rewriting conflicts
-
-- allow various history rewriting UI to collaborate with a underlying common API
+``evolve`` is experimental!
+---------------------------

- ---
+TODO

-For more information, see the documents below
-
-.. toctree::
-   :maxdepth: 1
+  * unstable UI
+  * some corner cases not covered yet

-   obs-concept
-   obs-terms
-   obs-implementation
-
+Installation and setup
+----------------------

-Known limitations and bugs
-=================================
-
-Here is a list of known issues that will be fixed later:
-
+TODO

-* You need to provide to `graft --continue -O` if you started you
-  graft using `-O`.
-
-  you to manually specify target all the time.
-
-* Trying to exchange obsolete marker with a static http repo will crash.
+Next steps:
+  * For a practical guide to using ``evolve`` in a single repository,
+    see the `user guide`_.
+  * For more advanced tricks, see `sharing mutable history`_.
+  * To learn about the concepts underlying ``evolve``, see `concepts`_
+    (incomplete).
+  * If you're coming from MQ, see the `MQ migration guide`_ (incomplete).

-* Extinct changesets are hidden using the *hidden* feature of mercurial only
-  supported by a few commands.
-
-  Only ``hg log``, ``hgview`` and `hg glog` support it. Neither ``hg heads`` nor other visual viewers do.
-
-* hg heads shows extinct changesets.
+.. _`user guide`: user-guide.html
+.. _`concepts`: concepts.html
+.. _`sharing mutable history`: sharing.html
+.. _`MQ migration guide`: from-mq.html
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/sharing.rst	Wed Jul 30 13:40:40 2014 -0700
@@ -0,0 +1,461 @@
+.. Copyright © 2014 Greg Ward <greg@gerg.ca>
+
+------------------------------
+Evolve: Shared Mutable History
+------------------------------
+
+Once you have mastered the art of mutable history in a single
+repository, you might want to move up to the next level: *shared*
+mutable history. ``evolve`` lets you push and pull draft changesets
+between repositories along with their obsolescence markers. This opens
+up a number of interesting possibilities.
+
+The most common scenario is a single developer working across two
+computers. Say you're working on code that must be tested on a remote
+test server, probably in a rack somewhere, only accessible by SSH, and
+running an “enterprise-grade” (out-of-date) OS. But you probably
+prefer to write code locally: everything is setup the way you like it,
+and you can use your preferred editor, IDE, merge/diff tools, etc.
+
+Traditionally, your options are limited: either
+
+  * (ab)use your source control system by committing half-working code
+    in order to get it onto the remote test server, or
+  * go behind source control's back by using ``rsync`` (or similar) to
+    transfer your code back-and-forth until it is ready to commit
+
+The former is less bad with distributed version control systems like
+Mercurial, but it's still far from ideal. (One important version
+control “best practice” is that every commit should make things just a
+little bit better, i.e. you should never commit code that is worse
+than what came before.) The latter, avoiding version control entirely,
+means that you're walking a tightrope without a safety net. One
+accidental ``rsync`` in the wrong direction could destroy hours of
+work.
+
+Using Mercurial with ``evolve`` to share mutable history solves all of
+these problems. As with single-repository ``evolve``, you can commit
+whenever the code is demonstrably better, even if all the tests aren't
+passing yet—just ``hg amend`` when they are. And you can transfer
+those half-baked changesets between repositories to try things out on
+your test server before anything is carved in stone.
+
+A less common scenario is multiple developers sharing mutable history.
+(This is in fact how Mercurial itself is developed.) We'll cover this
+scenario later. But first, single-user sharing.
+
+Publishing and non-publishing repositories
+------------------------------------------
+
+The key to shared mutable history is to keep your changesets in
+*draft* phase as you pass them around. Recall that by default, ``hg
+push`` promotes changesets from *draft* to *public*, and public
+changesets are immutable. You can change this behaviour by
+reconfiguring the *target* repository so that it is non-publishing.
+(Short version: set ``phases.publish`` to ``false``. Long version
+follows.)
+
+Setting things up
+-----------------
+
+We'll work an example with three local repositories, although in the
+real world they'd most likely be on three different computers. First,
+the public repository is where tested, polished changesets live, and
+it is where you push/pull changesets to/from the rest of your team. ::
+
+  $ hg init public
+
+We'll need two clones where work gets done::
+
+  $ hg clone -q public test-repo
+  $ hg clone -q test-repo dev-repo
+
+``dev-repo`` is your local machine, with GUI merge tools and IDEs and
+everything configured just the way you like it. ``test-repo`` is the
+test server in a rack somewhere behind SSH. So for the most part,
+we'll develop in ``dev-repo``, push to ``test-repo``, test and polish
+there, and push to ``public``.
+
+The key to making this whole thing work is to make ``test-repo``
+non-publishing::
+
+  $ cat >> test-repo/.hg/hgrc <<EOF
+  [phases]
+  publish = false
+  EOF
+
+We also have to configure ``evolve`` in both ``test-repo`` and
+``dev-repo``, so that we can amend and evolve in both of them. ::
+
+  $ cat >> test-repo/.hg/hgrc <<EOF
+  [extensions]
+  rebase =
+  evolve = /path/to/mutable-history/hgext/evolve.py
+  EOF
+  $ cat >> dev-repo/.hg/hgrc <<EOF
+  [extensions]
+  rebase =
+  evolve = /path/to/mutable-history/hgext/evolve.py
+  EOF
+
+Keep in mind that in real life, these repositories would probably be
+on separate computers, so you'd have to login to each one to configure
+each repository.
+
+To start things off, let's make one public, immutable changeset::
+
+  $ cd test-repo
+  $ echo 'my new project' > file1
+  $ hg add file1
+  $ hg commit -m 'create new project'
+  $ hg push -q
+
+and pull that into the development repository::
+
+  $ cd ../dev-repo
+  $ hg pull -u
+
+Amending a shared changeset
+---------------------------
+
+Everything you learned in the `user guide`_ applies to work done in
+``dev-repo``. You can commit, amend, uncommit, evolve, and so forth
+just as before.
+
+.. _`user guide`: user-guide.html
+
+Things get different when you push changesets to ``test-repo``. Or
+rather, things stay the same, which *is* different: because we
+configured ``test-repo`` to be non-publishing, draft changesets stay
+draft when we push them to ``test-repo``. Importantly, they're also
+draft (mutable) in ``test-repo``.
+
+Let's commit a preliminary change and push it to ``test-repo`` for
+testing. ::
+
+  $ echo 'fix fix fix' > file1
+  $ hg commit -m 'prelim change'
+  $ hg push ../test-repo
+
+At this point, ``dev-repo`` and ``test-repo`` have the same changesets
+in the same phases:
+
+  [figure SG01: rev 0:0dc9 public, rev 1:f649 draft, same on both repos]
+
+(You may notice a change in notation from the user guide: now
+changesets are labelled with their revision number and the first four
+digits of the 40-digit hexadecimal changeset ID. Mercurial revision
+numbers are never stable when working across repositories, especially
+when obsolescence is involved. We'll see why shortly.)
+
+Now let's switch to ``test-repo`` to test our change::
+
+  $ cd ../test-repo
+  $ hg update
+
+Don't forget to ``hg update``! Pushing only adds changesets to a
+remote repository; it does not update the working directory (unless
+you have a hook that updates for you).
+
+Now let's imagine the tests failed because we didn't use proper
+punctuation and capitalization (oops). Let's amend our preliminary fix
+(and fix the lame commit message while we're at it)::
+
+  $ echo 'Fix fix fix.' > file1
+  $ hg amend -m 'fix bug 37'
+
+Now we're in a funny intermediate state (figure 2): revision 1:f649 is
+obsolete in ``test-repo``, having been replaced by revision 3:60ff
+(revision 2:2a03 is another one of those temporary amend commits that
+we saw in the user guide)—but ``dev-repo`` knows nothing of these
+recent developments.
+
+  [figure SG02: rev 0:0dc9 public, rev 1:f649, 2:2a03 obsolete, rev 3:60ff draft -- but dev-repo same as in SG01]
+
+Let's resynchronize::
+
+  $ cd ../dev-repo
+  $ hg pull -u
+
+As seen in figure 3, this transfers the new changeset *and* the
+obsolescence marker for revision 1. However, it does *not* transfer
+the temporary amend commit, because it is obsolete. Push and pull
+transfer obsolesence markers between repositories, but they do not
+normally transfer obsolete changesets.
+
+  [figure SG03: dev-repo grows new rev 2:60ff, marks 1:f649 obsolete]
+
+Because of this deliberately incomplete synchronization, revision
+numbers in ``test-repo`` and ``dev-repo`` are no longer consistent. We
+*must* use changeset IDs.
+
+Amend again, locally
+--------------------
+
+This process can repeat. Perhaps you figure out a more elegant fix to
+the bug, and want to mutate history so nobody ever knows you had a
+less-than-perfect idea. We'll implement it locally in ``dev-repo`` and
+push to ``test-repo``::
+
+  $ echo 'Fix, fix, and fix.' > file1
+  $ hg amend
+  $ hg push
+
+This time around, the temporary amend commit is in ``dev-repo``, and
+it is not transferred to ``test-repo``—the same as before, just in the
+opposite direction. Figure 4 shows the two repositories after amending
+in ``dev-repo`` and pushing to ``test-repo``.
+
+  [figure SG04: each repo has one temporary amend commit, but they're different in each one]
+
+Let's hop over to ``test-repo`` to test the more elegant fix::
+
+  $ cd ../test-repo
+  $ hg update -q
+
+This time, all the tests pass, so no further amendment is required.
+This bug fix is finished, so we push it to the public repository::
+
+  $ hg push
+  [...]
+  added 1 changesets with 1 changes to 1 files
+
+Note that only one changeset—the final version, after two
+amendments—was actually pushed. Again, Mercurial normally doesn't
+transfer obsolete changesets on push and pull. (Specifically, it
+doesn't transfer *hidden* changesets: roughly speaking, obsolete
+changesets with no non-obsolete descendants. If you're curious, see
+the `concept guide`_ for the precise definition of hidden.)
+
+.. _`concept guide`: concepts.html
+
+So the picture in ``public`` is much simpler than in either
+``dev-repo`` or ``test-repo``. None of our missteps or amendments are
+visible publicly, just the final, beautifully polished changeset:
+
+  [figure SG05: public repo with rev 0:0dc9, 1:de61, both public]
+
+There is one important step left to do. Because we pushed from
+``test-repo`` to ``public``, the pushed changeset is in *public* phase
+in those two repositories. But ``dev-repo`` knows nothing of this:
+that changeset is still *draft* there. If we're not careful, we might
+mutate history in ``dev-repo``, obsoleting a changeset that is already
+public. Let's avoid that situation for now by pulling from
+``test-repo`` down to ``dev-repo``::
+
+  $ cd ../dev-repo
+  $ hg pull -u
+
+Getting into trouble
+--------------------
+
+Mercurial with ``evolve`` is a powerful tool, and using powerful tools
+can have consequences. (You can cut yourself badly with a sharp knife,
+but every competent chef keeps several around. Ever try to chop onions
+with a spoon?)
+
+In the user guide, we saw examples of *unstable* changesets, which are
+the most common type of troubled changeset. (Recall that a
+non-obsolete changeset with obsolete ancestors is unstable.)
+
+Two other types of trouble can crop up: *bumped* and *divergent*
+changesets. Both are more likely with shared mutable history,
+especially mutable history shared by multiple developers.
+
+To demonstrate, let's start with the ``public`` repository as we left
+it in the last example, with two immutable changesets (figure 5
+above). Two developers, Alice and Bob, start working from this point::
+
+  $ hg clone -q public alice
+  $ hg clone -q public bob
+
+We need to configure Alice's and Bob's working repositories similar to
+``test-repo``, i.e. make them non-publishing and enable ``evolve``::
+
+  $ cat >> alice/.hg/hgrc <<EOF
+  [phases]
+  publish = false
+  [extensions]
+  rebase =
+  evolve = /path/to/mutable-history/hgext/evolve.py
+  EOF
+  $ cp alice/.hg/hgrc bob/.hg/hgrc
+
+Bumped changesets: only one gets on the plane
+---------------------------------------------
+
+If two people show up at the airport with tickets for the same seat on
+the same plane, only one of them gets on the plane. The would-be
+traveller left behind in the airport terminal is said to have been
+*bumped*.
+
+Similarly, if Alice and Bob are collaborating on some mutable
+changesets, it's possible to get into a situation where an otherwise
+worthwhile changeset cannot be pushed to the public repository; it is
+bumped by an alternative changeset that happened to get there first.
+Let's demonstrate one way this could happen.
+
+It starts with Alice committing a bug fix. Right now, we don't yet
+know if this bug fix is good enough to push to the public repository,
+but it's good enough for Alice to commit. ::
+
+  $ cd alice
+  $ echo 'fix' > file2
+  $ hg commit -q -A -m 'fix bug 15'
+
+Now Bob has a bad idea: he decides to pull whatever Alice is working
+on and tweak her bug fix to his taste::
+
+  $ cd ../bob
+  $ hg pull -q -u ../alice
+  $ echo 'Fix.' > file2
+  $ hg amend -q -A -m 'fix bug 15 (amended)'
+
+(Note the lack of communication between Alice and Bob. Failing to
+communicate with your colleagues is a good way to get into trouble.
+Nevertheless, ``evolve`` can usually sort things out, as we will see.)
+
+  [figure SG06: Bob's repo with one amendment]
+
+After some testing, Alice realizes her bug fix is just fine as it is:
+no need for further polishing and amending, this changeset is ready to
+publish. ::
+
+  $ cd ../alice
+  $ hg push  -q
+
+This introduces a contradiction: in Bob's repository, changeset 2:e011
+(his copy of Alice's fix) is obsolete, since Bob amended it. But in
+Alice's repository (and ``public``), that changeset is public: it is
+immutable, carved in stone for all eternity. No changeset can be both
+obsolete and public, so Bob is in for a surprise the next time he
+pulls from ``public``::
+
+  $ cd ../bob
+  $ hg pull -q -u
+  1 new bumped changesets
+
+Figure 7 shows what just happened to Bob's repository: changeset
+2:e011 is now public, so it can't be obsolete. When that changeset was
+obsolete, it made perfect sense for it to have a successor, namely
+Bob's amendment of Alice's fix (changeset 4:fe88). But it's illogical
+for a public changeset to have a successor, so 4:fe88 is in trouble:
+it has been *bumped*.
+
+  [figure SG07: 2:e011 now public not obsolete, 4:fe88 now bumped]
+
+As usual when there's trouble in your repository, the solution is to
+evolve it::
+
+  $ hg evolve --all
+
+Figure 8 illustrate's Bob's repository after evolving away the bumped
+changeset. Ignoring the obsolete changesets, Bob now has a nice,
+clean, simple history. His amendment of Alice's bug fix lives on, as
+changeset 5:227d—albeit with a software-generated commit message. (Bob
+should probably amend that changeset to improve the commit message.)
+But the important thing is that his repository no longer has any
+troubled changesets, thanks to ``evolve``.
+
+  [figure SG08: 5:227d is new, formerly bumped changeset 4:fe88 now hidden]
+
+Divergent changesets
+--------------------
+
+In addition to *unstable* and *bumped*, there is a third kind of
+troubled changeset: *divergent*. When an obsolete changeset has two
+successors, those successors are divergent.
+
+To illustrate, let's start Alice and Bob at the same
+point—specifically, the point where Alice's repository currently
+stands. Bob's repository is a bit of a mess, so we'll throw it away
+and start him off with a copy of Alice's repository::
+
+  $ cd ..
+  $ rm -rf bob
+  $ cp -rp alice bob
+
+Now we'll have Bob commit a bug fix that could still be improved::
+
+  $ cd bob
+  $ echo 'pretty good fix' >> file1
+  $ hg commit -u bob -m 'fix bug 24 (v1)'
+
+This time, Alice meddles with her colleague's work (still a bad
+idea)::
+
+  $ cd ../alice
+  $ hg pull -q -u ../bob
+  $ echo 'better (alice)' >> file1
+  $ hg amend -u alice -m 'fix bug 24 (v2 by alice)'
+
+Here's where things change from the "bumped" scenario above: this
+time, the original author (Bob) decides to amend his changeset too. ::
+
+  $ cd ../bob
+  $ echo 'better (bob)' >> file1
+  $ hg amend -u bob -m 'fix bug 24 (v2 by bob)'
+
+At this point, the divergence exists, but only in theory: Bob's
+original changeset, 3:fe81, is obsolete and has two successors. But
+those successors are in different repositories, so the trouble is not
+visible to anyone yet. It will be as soon as one of our players pulls
+from the other's repository. Let's make Bob the victim again::
+
+  $ hg pull -q -u ../alice
+  not updating: not a linear update
+  (merge or update --check to force update)
+  2 new divergent changesets
+
+The “not a linear update” is our first hint that something is wrong,
+but of course “2 new divergent changesets” is the real problem. Figure
+9 shows both problems.
+
+  [figure SG09: bob's repo with 2 heads for the 2 divergent changesets, 5:fc16 and 6:694f; wc is at 5:fc16, hence update refused; both are successors of obsolete 3:fe81, hence divergence]
+
+Now we need to get out of trouble. Unfortunately, a `bug`_ in
+``evolve`` means that the usual answer (run ``hg evolve --all``) does
+not work. Bob has to figure out the solution on his own: in this case,
+merge. To avoid distractions, we'll set ``HGMERGE`` to make Mercurial
+resolve any conflicts in favour of Bob. ::
+
+  $ HGMERGE=internal:local hg merge
+  $ hg commit -m merge
+
+.. _`bug`: https://bitbucket.org/marmoute/mutable-history/issue/48/
+
+This is approximately what ``hg evolve`` would do in this
+circumstance, if not for that bug. One annoying difference is that
+Mercurial thinks the two divergent changesets are still divergent,
+which you can see with a simple revset query::
+
+  $ hg log -q -r 'divergent()'
+  5:fc16901f4d7a
+  6:694fd0f6b503
+
+(That annoyance should go away when the bug is fixed.)
+
+Conclusion
+----------
+
+Mutable history is a powerful tool. Like a sharp knife, an experienced
+user can do wonderful things with it, much more wonderful than with a
+dull knife (never mind a rusty spoon). At the same time, an
+inattentive or careless user can do harm to himself or others.
+Mercurial with ``evolve`` goes to great lengths to limit the harm you
+can do by trying to handle all possible types of “troubled”
+changesets. But having a first-aid kit nearby does not excuse you from
+being careful with sharp knives.
+
+Mutable history shared across multiple repositories by a single
+developer is a natural extension of this model. Once you are used to
+using a single sharp knife on its own, it's pretty straightforward to
+chop onions and mushrooms using the same knife, or to alternate
+between two chopping boards with different knives.
+
+Mutable history shared by multiple developers is a scary place to go.
+Imagine a professional kitchen full of expert chefs tossing their
+favourite knives back and forth, with the occasional axe or chainsaw
+thrown in to spice things up. If you're confident that you *and your
+colleagues* can do it without losing a limb, go for it. But be sure to
+practice a lot first before you rely on it!
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/user-guide.rst	Wed Jul 30 13:40:40 2014 -0700
@@ -0,0 +1,561 @@
+.. Copyright © 2014 Greg Ward <greg@gerg.ca>
+
+------------------
+Evolve: User Guide
+------------------
+
+.. contents::
+
+Life without ``evolve``
+-----------------------
+
+Before we dive into learning about ``evolve``, let's look into some
+features of core Mercurial that interact with ``evolve``. ``commit``
+affects ``evolve``, and ``evolve`` modifies how ``commit --amend``
+works.
+
+Example 1: Commit a new changeset
+=================================
+
+To create a new changeset, simply run ``hg commit`` as usual.
+``evolve`` does not change the behaviour of ``commit`` at all.
+
+However, it's important to understand that new changesets are in the
+*draft* phase by default: they are mutable. This means that they can
+be modified by Mercurial's existing history-editing commands
+(``rebase``, ``histedit``, etc.), and also by the ``evolve``
+extension. Specifically, ``evolve`` adds a number of commands that can
+be used to modify history: ``amend``, ``uncommit``, ``prune``,
+``fold``, and ``evolve``. Generally speaking, changesets remain in
+*draft* phase until they are pushed to another repository, at which
+point they enter *public* phase. ::
+
+  $ hg commit -m 'implement feature X'
+  $ hg phase -r .
+  1: draft
+
+(Strictly speaking, changesets only become public when they are pushed
+to a *publishing* repository. But all repositories are publishing by
+default; you have to explicitly configure repositories to be
+*non-publishing*. Non-publishing repositories are an advanced topic
+which we'll see when we get to `sharing mutable history`_.)
+
+.. _`sharing mutable history`: sharing.html
+
+Example 2: Amend a changeset (traditional)
+==========================================
+
+Imagine you've just committed a new changeset, and then you discover a
+mistake. Maybe you forgot to run the tests and a failure slipped in.
+You want to modify history so that you push one perfect changeset,
+rather than one flawed changeset followed by an "oops" commit. (Or
+perhaps you made a typo in the commit message—this is really feature
+*Y*, not feature X. You can't fix that with a followup commit.)
+
+This is actually trivial with plain vanilla Mercurial since 2.2: fix
+your mistake and run ::
+
+  $ hg commit --amend -m 'implement feature Y'
+
+to create a new, amended changeset. The drawback of doing this with
+vanilla Mercurial is that your original, flawed, changeset is removed
+from the repository. This is *unsafe* history editing. It's probably
+not too serious if all you did was fix a syntax error, but still.
+
+.. figure:: figures/figure-ug01.svg
+
+   Figure 1: unsafe history modification with core Mercurial (not
+   using ``evolve``): the original revision 1 is destroyed.
+
+(Incidentally, Mercurial's traditional history modification mechanism
+isn't *really* unsafe: any changeset(s) removed from the repository
+are kept in a backup directory, so you can manually restore them later
+if you change your mind. But it's awkward and inconvenient compared to
+the features provided by ``evolve`` and changeset obsolescence.)
+
+Life with ``evolve`` (basic usage)
+----------------------------------
+
+Once you enable the ``evolve`` extension, a number of features are
+available to you. First, we're going to explore several examples of
+painless, trouble-free history modification.
+
+Example 3: Amend a changeset (with ``evolve``)
+==============================================
+
+Outwardly, amending a changeset with ``evolve`` can look exactly the
+same as it does with core Mercurial (example 2)::
+
+  $ hg commit --amend -m 'implement feature Y'
+
+Alternately, you can use the new ``amend`` command added by
+``evolve``::
+
+  $ hg amend -m 'implement feature Y'
+
+(``hg amend`` is nearly synonymous with ``hg commit --amend``. The
+difference is that ``hg amend`` reuses the existing commit message by
+default, whereas ``hg commit --amend`` runs your editor if you don't
+pass ``-m`` or ``-l``.)
+
+Under the hood, though, things are quite different. Mercurial has
+simply marked the old changeset *obsolete*, replacing it with a new
+one. We'll explore what this means in detail later, after working
+through a few more examples.
+
+Example 4: Prune an unwanted changeset
+======================================
+
+Sometimes you make a change, and then decide it was such a bad idea
+that you don't want anyone to know about it. Or maybe it was a
+debugging hack that you needed to keep around for a while, but do not
+intend to ever push publicly. ::
+
+  $ echo 'debug hack' >> file1.c
+  $ hg commit -m 'debug hack'
+
+In either case, ``hg prune`` is the answer. ``prune`` simply marks
+changesets obsolete without creating any new changesets to replace
+them::
+
+  $ hg prune .
+  1 changesets pruned
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  working directory now at 934359450037
+
+Outwardly, it appears that your “debug hack” commit never happened;
+we're right back where we started::
+
+  $ hg parents --template '{rev}:{node|short}  {desc|firstline}\n'
+  3:934359450037  implement feature Y
+
+In reality, though, the “debug hack” is still there, obsolete and hidden.
+
+Example 5: Uncommit changes to certain files
+============================================
+
+Occasionally you commit more than you intended: perhaps you made
+unrelated changes to different files, and thus intend to commit
+different files separately. ::
+
+  $ echo 'relevant' >> file1.c
+  $ echo 'irrelevant' >> file2.c
+
+If you forget to specify filenames on the ``commit`` command line,
+Mercurial commits all those changes together::
+
+  $ hg commit -m 'fix bug 234'          # oops: too many files
+
+Luckily, this mistake is easy to fix with ``uncommit``::
+
+  $ hg uncommit file2.c
+  $ hg status
+  M file2.c
+
+Let's verify that the replacement changeset looks right (i.e.,
+modifies only ``file1.c``)::
+
+  $ hg parents --template '{rev}:{node|short}  {desc|firstline}\n{files}\n'
+  6:c8defeecf7a4  fix bug 234
+  file1.c
+
+As before, the original flawed changeset is still there, but obsolete
+and hidden. It won't be exchanged with other repositories by ``push``,
+``pull``, or ``clone``.
+
+Example 6: Fold multiple changesets together into one
+=====================================================
+
+If you're making extensive changes to fragile source code, you might
+commit more frequently than normal so that you can fallback on a
+known good state if one step goes badly. ::
+
+  $ echo step1 >> file1.c
+  $ hg commit -m 'step 1'               # revision 7
+  $ echo step2 >> file1.c
+  $ hg commit -m 'step 2'               # revision 8
+  $ echo step3 >> file2.c
+  $ hg commit -m 'step 3'               # revision 9
+
+At the end of such a sequence, you often end up with a series of small
+changesets that are tedious to review individually. It might make more
+sense to combine them into a single changeset using the ``fold``
+command.
+
+To make sure we pass the right revisions to ``fold``, let's review the
+changesets we just created, from revision 7::
+
+  $ hg log --template '{rev}:{node|short}  {desc|firstline}\n' -r 7::
+  7:05e61aab8294  step 1
+  8:be6d5bc8e4cc  step 2
+  9:35f432d9f7c1  step 3
+
+and fold them::
+
+  $ hg fold -m 'fix bug 64' -r 7::
+  3 changesets folded
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+This time, Mercurial marks three changesets obsolete, replacing them
+all with a single *successor*.
+
+(You might be familiar with this operation under other names, like
+*squash* or *collapse*.)
+
+Changeset obsolescence under the hood
+-------------------------------------
+
+So far, everything has gone just fine. We haven't run into merge
+conflicts or other trouble. Before we start exploring advanced usage
+that can run into trouble, let's step back and see what happens when
+Mercurial marks changesets obsolete. That will make it much easier to
+understand the more advanced use cases we'll see later.
+
+When you have the ``evolve`` extension enabled, all history
+modification uses the same underlying mechanism: the original
+changesets are marked *obsolete* and replaced by zero or more
+*successors*. The obsolete changesets are the *precursors* of their
+successors. This applies equally to built-in commands (``commit
+--amend``), commands added by ``evolve`` (``amend``, ``prune``,
+``uncommit``, ``fold``), and even commands provided by other
+extensions (``rebase``, ``histedit``).
+
+Another way of looking at it is that obsolescence is second-order
+version control, i.e. the history of your history. We'll cover this in
+more detail (and mathematical precision) in the `concepts`_ guide.
+
+.. _`concepts`: concepts.html
+
+Under the hood: Amend a changeset
+=================================
+
+Consider Example 2, amending a changeset with ``evolve``. We saw above
+that you can do this using the exact same command-line syntax as core
+Mercurial, namely ``hg commit --amend``. But the implementation is
+quite different, and Figure 2 shows how.
+
+.. figure:: figures/figure-ug02.svg
+
+   Figure 2: safe history modification using ``evolve``: the original
+   revision 1 is preserved as an obsolete changeset. (The "temporary
+   amend commit", marked with T, is an implementation detail stemming
+   from limitations in Mercurial's current merge machinery. Future
+   versions of Mercurial will not create them.)
+
+In this case, the obsolete changesets are also *hidden*. That is the
+usual end state for obsolete changesets. But many scenarios result in
+obsolete changesets that are still visible, which indicates your
+history modification work is not yet done. We'll see examples of that
+later, when we cover advanced usage.
+
+Seeing hidden changesets
+========================
+
+TODO
+
+Under the hood: Prune an unwanted changeset
+===========================================
+
+``prune`` (example 4 above) is the simplest history modification
+command provided by ``evolve``. All it does is mark the specified
+changeset(s) obsolete, with no successor/precursor relationships
+involved. (If the working directory parent was one of the obsolete
+changesets, ``prune`` updates back to a suitable ancestor.)
+
+.. figure:: figures/figure-ug03.svg
+
+   Figure 3: pruning a changeset marks it obsolete with no successors.
+
+Under the hood: Uncommit changes to certain files
+=================================================
+
+In one sense, ``uncommit`` is a simplified version of ``amend``. Like
+``amend``, it obsoletes one changeset and leaves it with a single
+successor. Unlike ``amend``, there is no ugly "temporary amend commit"
+cluttering up the repository.
+
+In another sense, ``uncommit`` is the inverse of ``amend``: ``amend``
+takes any uncommitted changes in the working dir and “adds”
+them to the working directory's parent changeset. (In reality, of
+course, it creates a successor changeset, marking the original
+obsolete.) In contrast, ``uncommit`` takes some changes in the working
+directory's parent and moves them to the working dir, creating a new
+successor changeset in the process. Figure 4 illustrates.
+
+.. figure:: figures/figure-ug04.svg
+
+   Figure 4: uncommit moves some of the changes from the working
+   directory parent into the working dir, preserving the remaining
+   changes as a new successor changeset. (N.B. revision 4 is not shown
+   here because it was marked obsolete in the previous example.)
+
+
+Under the hood: Fold multiple changesets together into one
+==========================================================
+
+The last basic example is folding multiple changesets into one, which
+marks multiple changesets obsolete, replacing them all with a single
+successor.
+
+.. figure:: figures/figure-ug05.svg
+
+   Figure 5: fold combines multiple changesets into a single
+   successor, marking the original (folded) changesets obsolete.
+
+
+Obsolete is not hidden
+======================
+
+TODO
+
+
+Understanding revision numbers
+==============================
+
+If you're trying these examples on your own, especially using ``hg
+log`` without ``--hidden``, you have probably noticed some funny
+business going on with revision numbers: there are now gaps in the
+sequence. That's something you don't see with plain vanilla Mercurial;
+normally, revision N is always followed by revision N+1.
+
+This is just the visible manifestation of hidden changesets. If
+revision 95 is followed by revision 98, that means there are two
+hidden changesets, 96 and 97, in between.
+
+Note that changeset IDs are still the permanent, immutable identifier
+for changesets. Revision numbers are, as ever, a handy shorthand that
+work in your local repository, but cannot be used across repositories.
+They also have the useful property of showing when there are hidden
+changesets lurking under the covers, which is why this document uses
+revision numbers.
+
+
+Life with ``evolve`` (advanced usage)
+-------------------------------------
+
+Now that you've got a solid understanding of how ``evolve`` works in
+concert with changeset obsolescence, let's explore some more advanced
+scenarios. All of these scenarios will involve *unstable* changesets,
+which is an unavoidable consequence of obsolescence. What really sets
+``evolve`` apart from other history modification mechanisms is the
+fact that it recognizes troubles like unstable changesets and provides
+a consistent way for you to get out of trouble.
+
+(Incidentally, there are two other types of trouble that changesets
+can get into with ``evolve``: they may be *divergent* or *bumped*.
+Both of those states are more likely to occur when `sharing mutable
+history`_, so we won't see them in this user guide.)
+
+.. _`sharing mutable history`: sharing.html
+
+
+Example 7: Amend an older changeset
+===================================
+
+Sometimes you don't notice your mistakes until after you have
+committed some new changesets on top of them. ::
+
+  $ hg commit -m 'fix bug 17'         # rev 11 (mistake here)
+  $ hg commit -m 'cleanup'            # rev 12
+  $ hg commit -m 'feature 23'         # rev 13
+
+Traditionally, your only option is to commit an "oops" changeset that
+fixes your mistake. That works, of course, but it makes you look bad:
+you made a mistake, and the record of that mistake is recorded in
+history for all eternity. (If the mistake was in the commit message,
+too bad.)
+
+More subtly, there now exist changesets that are *worse* than what
+came before—the code no longer builds, the tests don't pass, or
+similar. Anyone reviewing these patches will waste time noticing the
+error in the earlier patch, and then the correction later on.
+
+You can avoid all this by amending the bad changeset and *evolving*
+subsequent history. Here's how it works, assuming you have just
+committed revision 13 and noticed the mistake in revision 11::
+
+  $ hg update 11
+  [...fix mistake...]
+  $ hg amend
+
+At this point, revision 11 is *obsolete* and revisions 12 and 13—the
+descendants of 11—are in a funny state: they are *unstable*.
+
+.. figure:: figures/figure-ug06.svg
+
+   Figure 6: amending a changeset with descendants means the amended
+   changeset is obsolete but remains visible; its non-obsolete
+   descendants are *unstable*. The temporary amend commit, revision
+   14, is hidden because it has no non-obsolete descendants.
+
+All non-obsolete descendants of an obsolete changeset are unstable. An
+interesting consequence of this is that revision 11 is still visible,
+even though it is obsolete. Obsolete changesets with non-obsolete
+descendants are not hidden.
+
+The fix is to *evolve* history::
+
+  $ hg evolve --all
+
+This is a separate step, not automatically part of ``hg amend``,
+because there might be conflicts. If your amended changeset modifies a
+file that one of its descendants also modified, Mercurial has to fire
+up your merge tool to resolve the conflict. More importantly, you have
+to switch contexts from "writing code" to "resolving conflicts". That
+can be an expensive context switch, so Mercurial lets you decide when
+to do it.
+
+The end state, after ``evolve`` finishes, is that the original
+revisions (11-13) are obsolete and hidden. Their successor revisions
+(15-17) replace them.
+
+.. figure:: figures/figure-ug07.svg
+
+   Figure 7: evolve your repository (``hg evolve --all``) to take care
+   of instability. Unstable changesets become obsolete, and are
+   replaced by successors just like the amended changeset was.
+
+Example 8: Prune an older changeset
+===================================
+
+Let's say you've just committed the following changesets::
+
+  $ hg commit -m 'useful work'       # rev 18
+  $ hg commit -m 'debug hack'        # rev 19
+  $ hg commit -m 'more work'         # rev 20
+
+You want to drop revision 19, but keep 18 and 20. No problem::
+
+  $ hg prune 19
+  1 changesets pruned
+  1 new unstable changesets
+
+As above, this leaves your repository in a funny intermediate state:
+revision 20 is the non-obsolete descendant of obsolete revision 19.
+That is, revision 20 is unstable.
+
+.. figure:: figures/figure-ug08.svg
+
+   Figure 8: ``hg prune`` marks a changeset obsolete without creating
+   a successor. Just like with ``hg amend``, non-obsolete descendants
+   of the pruned changeset are now unstable.
+
+As before, the solution to unstable changesets is to evolve your
+repository::
+
+  $ hg evolve --all
+
+This rebases revision 20 on top of 18 as the new revision 21, leaving
+19 and 20 obsolete and hidden:
+
+.. figure:: figures/figure-ug09.svg
+
+   Figure 9: once again, ``hg evolve --all`` takes care of instability.
+
+Example 9: Uncommit files from an older changeset (discard changes)
+=======================================================================
+
+As in example 5, let's say you accidentally commit some unrelated
+changes together. Unlike example 5, you don't notice your mistake
+immediately, but commit a new changeset on top of the bad one. ::
+
+  $ echo 'this fixes bug 53' >> file1.c
+  $ echo 'debug hack' >> file2.c
+  $ hg commit -m 'fix bug 53'                     # rev 22 (oops)
+  $ echo 'and this handles bug 67' >> file1.c
+  $ hg commit -m 'fix bug 67'                     # rev 23 (fine)
+
+As with ``amend``, you need to travel back in time and repair revision
+22, leaving your changes to ``file2.c`` back in the working
+directory::
+
+  $ hg update 22
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg uncommit file2.c
+  1 new unstable changesets
+  $ hg status
+  M file2.c
+
+Now your repository has unstable changesets, so you need to evolve it.
+But ``hg evolve`` requires a clean working directory to resolve merge
+conflicts, so you need to decide what to do with ``file2.c``.
+
+In this case, the change to ``file2.c`` was a temporary debugging
+hack, so we can discard it and immediately evolve the instability away::
+
+  $ hg revert file2.c
+  $ hg evolve --all
+  move:[23] fix bug 67
+  atop:[24] fix bug 53
+
+Figure 10 illustrates the whole process.
+
+.. figure:: figures/figure-ug10.svg
+
+   Figure 10: ``hg uncommit`` of a changeset with descendants results
+   in instability *and* a dirty working directory, both of which must
+   be dealt with.
+
+
+Example 10: Uncommit files to an older changeset (keep changes)
+===================================================================
+
+This is very similar to example 9. The difference that this time, our
+change to ``file2.c`` is valuable enough to commit, making things a
+bit more complicated. The setup is nearly identical::
+
+  $ echo 'fix a bug' >> file1.c
+  $ echo 'useful but unrelated' >> file2.c
+  $ hg commit -u dan -d '11 0' -m 'fix a bug'     # rev 26 (oops)
+  $ echo 'new feature' >> file1.c
+  $ hg commit -u dan -d '12 0' -m 'new feature'   # rev 27 (fine)
+
+As before, we update back to the flawed changeset (this time,
+revision 26) and ``uncommit``, leaving uncommitted changes to
+``file2.c`` in the working dir::
+
+  $ hg update -q 26
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg uncommit -q file2.c                        # obsoletes rev 26, creates rev 28
+  1 new unstable changesets
+  $ hg status
+  M file2.c
+
+This time, let's save that useful change before evolving::
+
+  $ hg commit -m 'useful tweak'                   # rev 29
+
+Figure 11 shows the story so far: ``uncommit`` obsoleted revision 26
+and created revision 28, the successor of 26. Then we committed
+revision 29, a child of 28. We still have to deal with the unstable
+revision 27.
+
+.. figure:: figures/figure-ug11.svg
+
+   Figure 11: Uncommitting a file and then committing that change
+   separately will soon result in a two-headed repository.
+
+This is where things get tricky. As usual when a repository has
+unstable changesets, we want to evolve it::
+
+  $ hg evolve --all
+
+The problem is that ``hg evolve`` rebases revision 27 onto revision
+28, creating 30 (the successor of 27). This is entirely logical: 27
+was the child of 26, and 26's successor is 28. So of course 27's
+successor (30) should be the child of 26's successor (28).
+Unfortunately, that leaves us with a two-headed repository:
+
+.. figure:: figures/figure-ug12.svg
+
+   Figure 12: ``evolve`` takes care of unstable changesets; it does
+   not solve all the world's problems.
+
+As usual when faced with a two-headed repository, you can either merge
+or rebase. It's up to you.
+
+
+Example 11: Recover an obsolete changeset
+=========================================
+
+TODO
--- a/hgext/drophack.py	Wed Jul 30 13:38:33 2014 -0700
+++ b/hgext/drophack.py	Wed Jul 30 13:40:40 2014 -0700
@@ -106,7 +106,7 @@
     # lock from the beginning to prevent race
     wlock = lock = None
     try:
-        lock = repo.wlock()
+        wlock = repo.wlock()
         lock = repo.lock()
         # check they have no children
         if repo.revs('%ld and public()', revs):
--- a/hgext/evolve.py	Wed Jul 30 13:38:33 2014 -0700
+++ b/hgext/evolve.py	Wed Jul 30 13:40:40 2014 -0700
@@ -19,7 +19,7 @@
     - improves some aspect of the early implementation in Mercurial core
 '''

-testedwith = '3.0.1'
+testedwith = '3.0.1 3.1'
 buglink = 'http://bz.selenic.com/'

 import sys
@@ -58,11 +58,12 @@
 from mercurial import node
 from mercurial import phases
 from mercurial import patch
+from mercurial import pushkey
 from mercurial import revset
 from mercurial import scmutil
 from mercurial import templatekw
 from mercurial.i18n import _
-from mercurial.commands import walkopts, commitopts, commitopts2
+from mercurial.commands import walkopts, commitopts, commitopts2, mergetoolopts
 from mercurial.node import nullid
 from mercurial import wireproto
 from mercurial import localrepo
@@ -325,6 +326,25 @@
 ### experimental behavior                                         ###
 #####################################################################

+commitopts3 = [
+    ('D', 'current-date', None,
+     _('record the current date as commit date')),
+    ('U', 'current-user', None,
+     _('record the current user as committer')),
+]
+
+def _resolveoptions(ui, opts):
+    """modify commit options dict to handle related options
+
+    For now, all it does is figure out the commit date: respect -D unless
+    -d was supplied.
+    """
+    # N.B. this is extremely similar to setupheaderopts() in mq.py
+    if not opts.get('date') and opts.get('current_date'):
+        opts['date'] = '%d %d' % util.makedate()
+    if not opts.get('user') and opts.get('current_user'):
+        opts['user'] = ui.username()
+
 @eh.wrapfunction(mercurial.obsolete, 'createmarkers')
 def _createmarkers(orig, repo, relations, *args, **kwargs):
     """register parent information at prune time"""
@@ -435,7 +455,7 @@
     """``troubled()``
     Changesets with troubles.
     """
-    _ = revset.getargs(x, 0, 0, 'troubled takes no arguments')
+    revset.getargs(x, 0, 0, 'troubled takes no arguments')
     return repo.revs('%ld and (unstable() + bumped() + divergent())',
                      subset)

@@ -594,6 +614,13 @@
         return 'unstable'
     return 'stable'

+@eh.templatekw('troubles')
+def showtroubles(repo, ctx, **args):
+    """:troubles: List of strings. Evolution troubles affecting the changeset
+    (zero or more of "unstable", "divergent" or "bumped")."""
+    return templatekw.showlist('trouble', ctx.troubles(), plural='troubles',
+                               **args)
+
 #####################################################################
 ### Various trouble warning                                       ###
 #####################################################################
@@ -1126,7 +1153,8 @@
         'do not perform actions, just print what would be done'),
     ('A', 'any', False, 'evolve any troubled changeset'),
     ('a', 'all', False, 'evolve all troubled changesets'),
-    ('c', 'continue', False, 'continue an interrupted evolution'), ],
+    ('c', 'continue', False, 'continue an interrupted evolution'),
+    ] + mergetoolopts,
     _('[OPTIONS]...'))
 def evolve(ui, repo, **opts):
     """Solve trouble in your repository
@@ -1156,6 +1184,7 @@
     anyopt = opts['any']
     allopt = opts['all']
     dryrunopt = opts['dry_run']
+    ui.setconfig('ui', 'forcemerge', opts.get('tool', ''), 'evolve')

     if contopt:
         if anyopt:
@@ -1322,11 +1351,10 @@
     target = targets[0]
     displayer = cmdutil.show_changeset(ui, repo, {'template': shorttemplate})
     target = repo[target]
-    repo.ui.status(_('move:'))
     if not ui.quiet:
+        repo.ui.status(_('move:'))
         displayer.show(orig)
-    repo.ui.status(_('atop:'))
-    if not ui.quiet:
+        repo.ui.status(_('atop:'))
         displayer.show(target)
     if progresscb: progresscb()
     todo = 'hg rebase -r %s -d %s\n' % (orig, target)
@@ -1796,7 +1824,7 @@
     ('', 'close-branch', None,
      _('mark a branch as closed, hiding it from the branch list')),
     ('s', 'secret', None, _('use the secret phase for committing')),
-    ] + walkopts + commitopts + commitopts2,
+    ] + walkopts + commitopts + commitopts2 + commitopts3,
     _('[OPTION]... [FILE]...'))
 def amend(ui, repo, *pats, **opts):
     """combine a changeset with updates and replace it with a new one
@@ -1821,6 +1849,7 @@
     opts['amend'] = True
     if not (edit or opts['message']):
         opts['message'] = repo['.'].description()
+    _resolveoptions(ui, opts)
     _alias, commitcmd = cmdutil.findcmd('commit', commands.table)
     return commitcmd[0](ui, repo, *pats, **opts)

@@ -1946,7 +1975,8 @@
                 match = scmutil.match(old, pats, opts)
                 newid = _commitfiltered(repo, old, match)
             if newid is None:
-                raise util.Abort(_('nothing to uncommit'))
+                raise util.Abort(_('nothing to uncommit'),
+                                 hint=_("use --all to uncommit all files"))
             # Move local changes on filtered changeset
             createmarkers(repo, [(old, (repo[newid],))])
             phases.retractboundary(repo, oldphase, [newid])
@@ -2029,9 +2059,9 @@
                 p2 = ctx.p2().node()
                 p1 = newmapping.get(p1, p1)
                 p2 = newmapping.get(p2, p2)
-                new, _ = rewrite(repo, ctx, [], ctx,
-                                 [p1, p2],
-                                 commitopts={'extra': extra})
+                new, unusedvariable = rewrite(repo, ctx, [], ctx,
+                                              [p1, p2],
+                                              commitopts={'extra': extra})
                 # store touched version to help potential children
                 newmapping[ctx.node()] = new
                 if not duplicate:
@@ -2046,41 +2076,76 @@
         lockmod.release(lock, wlock)

 @command('^fold|squash',
-    [('r', 'rev', [], _("explicitly specify the full set of revision to fold")),
+    [('r', 'rev', [], _("revision to fold")),
+     ('', 'exact', None, _("only fold specified revisions"))
     ] + commitopts + commitopts2,
-    # allow to choose the seed ?
-    _('rev'))
+    _('hg fold [OPTION]... [-r] REV'))
 def fold(ui, repo, *revs, **opts):
-    """Fold multiple revisions into a single one
-
-    The revisions from your current working directory to the given one are folded
-    into a single successor revision.
-
-    you can alternatively use --rev to explicitly specify revisions to be folded,
-    ignoring the current working directory parent.
+    """fold multiple revisions into a single one
+
+    Folds a set of revisions with the parent of the working directory.
+    All revisions linearly between the given revisions and the parent
+    of the working directory will also be folded.
+
+    Use --exact for folding only the specified revisions while ignoring the
+    parent of the working directory. In this case, the given revisions must
+    form a linear unbroken chain.
+
+    .. container:: verbose
+
+     Some examples:
+
+     - Fold the current revision with its parent::
+
+         hg fold .^
+
+     - Fold all draft revisions with working directory parent::
+
+         hg fold 'draft()'
+
+       See :hg:`help phases` for more about draft revisions and
+       :hg:`help revsets` for more about the `draft()` keyword
+
+     - Fold revisions 3, 4, 5, and 6 with the working directory parent::
+
+         hg fold 3:6
+
+     - Only fold revisions linearly between foo and @::
+
+         hg fold foo::@ --exact
     """
     revs = list(revs)
-    if revs:
-        if opts.get('rev', ()):
-            raise util.Abort("cannot specify both --rev and a target revision")
-        targets = scmutil.revrange(repo, revs)
-        revs = repo.revs('(%ld::.) or (.::%ld)', targets, targets)
-    elif 'rev' in opts:
-        revs = scmutil.revrange(repo, opts['rev'])
-    else:
-        revs = ()
+    revs.extend(opts['rev'])
     if not revs:
-        ui.write_err('no revision to fold\n')
+        raise util.Abort(_('no revisions specified'))
+
+    revs = scmutil.revrange(repo, revs)
+
+    if not opts['exact']:
+        # Try to extend given revision starting from the working directory
+        extrevs = repo.revs('(%ld::.) or (.::%ld)', revs, revs)
+        discardedrevs = [r for r in revs if r not in extrevs]
+        if discardedrevs:
+            raise util.Abort(_("cannot fold non-linear revisions"),
+                               hint=_("given revisions are unrelated to parent "
+                                      "of working directory"))
+        revs = extrevs
+
+    if len(revs) == 1:
+        ui.write_err(_('single revision specified, nothing to fold\n'))
         return 1
+
     roots = repo.revs('roots(%ld)', revs)
     if len(roots) > 1:
-        raise util.Abort("set has multiple roots")
+        raise util.Abort(_("cannot fold non-linear revisions "
+                           "(multiple roots given)"))
     root = repo[roots[0]]
     if root.phase() <= phases.public:
-        raise util.Abort("can't fold public revisions")
+        raise util.Abort(_("cannot fold public revisions"))
     heads = repo.revs('heads(%ld)', revs)
     if len(heads) > 1:
-        raise util.Abort("set has multiple heads")
+        raise util.Abort(_("cannot fold non-linear revisions "
+                           "(multiple heads given)"))
     head = repo[heads[0]]
     wlock = lock = None
     try:
@@ -2101,9 +2166,9 @@
                 commitopts['message'] =  "\n".join(msgs)
                 commitopts['edit'] = True

-            newid, _ = rewrite(repo, root, allctx, head,
-                             [root.p1().node(), root.p2().node()],
-                             commitopts=commitopts)
+            newid, unusedvariable = rewrite(repo, root, allctx, head,
+                                            [root.p1().node(), root.p2().node()],
+                                            commitopts=commitopts)
             phases.retractboundary(repo, targetphase, [newid])
             createmarkers(repo, [(ctx, (repo[newid],))
                                  for ctx in allctx])
@@ -2156,12 +2221,12 @@

     entry = cmdutil.findcmd('commit', commands.table)[1]
     entry[1].append(('o', 'obsolete', [],
-                     _("make commit obsolete this revision")))
+                     _("make commit obsolete this revision (DEPRECATED)")))
     entry = cmdutil.findcmd('graft', commands.table)[1]
     entry[1].append(('o', 'obsolete', [],
-                     _("make graft obsoletes this revision")))
+                     _("make graft obsoletes this revision (DEPRECATED)")))
     entry[1].append(('O', 'old-obsolete', False,
-                     _("make graft obsoletes its source")))
+                     _("make graft obsoletes its source (DEPRECATED)")))

 #####################################################################
 ### Obsolescence marker exchange experimenation                   ###
@@ -2254,25 +2319,125 @@
             yield d
             d = self.read(4096)

-
-
-@eh.wrapfunction(exchange, '_pushobsolete')
-def _pushobsolete(orig, pushop):
-    """utility function to push obsolete markers to a remote"""
-    pushop.ui.debug('try to push obsolete markers to remote\n')
+bundle2partsgenerators = getattr(exchange, 'bundle2partsgenerators', None)
+
+
+if bundle2partsgenerators is not None:
+
+    def _pushb2phases(pushop, bundler):
+        """adds phases update to the main bundle2 push"""
+        outgoing = pushop.outgoing
+        unfi = pushop.repo.unfiltered()
+        remotephases = pushop.remote.listkeys('phases')
+        publishing = remotephases.get('publishing', False)
+        ana = phases.analyzeremotephases(pushop.repo,
+                                         outgoing.commonheads,
+                                         remotephases)
+        pheads, droots = ana
+        revset = 'heads((%ln::%ln))'
+        if not publishing:
+            revset += ' and public()'
+        # Get the list of all revs draft on remote by public here.
+        # XXX Beware that revset break if droots is not strictly
+        # XXX root we may want to ensure it is but it is costly
+        fallback = list(unfi.set(revset, droots, outgoing.commonheads))
+        if not outgoing.missing:
+            future = fallback
+        else:
+            # adds changeset we are going to push as draft
+            #
+            # should not be necessary for pushblishing server, but because of
+            # an issue fixed in xxxxx we have to do it anyway.
+            fdroots = list(unfi.set('roots(%ln  + %ln::)', outgoing.missing, droots))
+            fdroots = [f.node() for f in fdroots]
+            future = list(unfi.set(revset, fdroots, outgoing.missingheads))
+
+        b2caps = bundle2.bundle2caps(pushop.remote)
+        if 'b2x:pushkey' not in b2caps:
+            return
+        pushop.stepsdone.add('phases')
+        part2node = []
+        enc = pushkey.encode
+        for newremotehead in future:
+            part = bundler.newpart('b2x:pushkey')
+            part.addparam('namespace', enc('phases'))
+            part.addparam('key', enc(newremotehead.hex()))
+            part.addparam('old', enc(str(phases.draft)))
+            part.addparam('new', enc(str(phases.public)))
+            part2node.append((part.id, newremotehead))
+        def handlereply(op):
+            for partid, pnode in part2node:
+                partrep = op.records.getreplies(partid)
+                results = partrep['pushkey']
+                assert len(results) <= 1
+                msg = None
+                if not results:
+                    msg = _('server ignored update of %s to public!\n') % pnode
+                elif not int(results[0]['return']):
+                    msg = _('updating %s to public failed!\n') % pnode
+                if msg is not None:
+                    pushop.ui.warn(msg)
+        return handlereply
+
+    def _pushb2obsmarker(pushop, bundler):
+        """adds obsmarker to the main bundle2 push"""
+        repo = pushop.repo
+        remote = pushop.remote
+        if ('obsmarkers' not in pushop.stepsdone
+            and (obsolete._enabled and repo.obsstore and
+                 'obsolete' in remote.listkeys('namespaces'))
+            and remote.capable('_evoext_b2x_obsmarkers_0')):
+            #
+            pushop.stepsdone.add('obsmarkers')
+            markers = _obsmarkersdiscovery(pushop)
+            if not markers:
+                repo.ui.status("OBSEXC: no marker to push\n")
+                repo.ui.status("OBSEXC: DONE\n")
+                return
+            obsdata = pushobsmarkerStringIO()
+            _encodemarkersstream(obsdata, markers)
+            obsdata.seek(0)
+            obsdata.ui = repo.ui
+            repo.ui.status("OBSEXC: pushing %i markers (%i bytes)\n"
+                           % (len(markers), len(obsdata.getvalue())))
+            bundler.newpart('EVOLVE:B2X:OBSMARKERV1', data=obsdata)
+            def callback(op):
+                repo.ui.progress('OBSEXC', None)
+                repo.ui.status("OBSEXC: DONE\n")
+            return callback
+    bundle2partsgenerators.append(_pushb2phases)
+    bundle2partsgenerators.append(_pushb2obsmarker)
+
+
+def _obsmarkersdiscovery(pushop):
+    """return the list of marker that needs to be pushed to the server
+
+    When used before (or at the same time) the changegroup have been pushed, it
+    returns the value as if the planned changegroup was succesful. Othewise it
+    use te actual common heads to decide whats needs to be pushed.
+    """
     repo = pushop.repo
     remote = pushop.remote
     unfi = repo.unfiltered()
     cl = unfi.changelog
+    commonheads = pushop.commonheads
+    if commonheads is None:
+        if pushop.revs is None:
+            commonheads = pushop.outgoing.commonheads
+            sch = set(commonheads)
+            commonheads.extend(h for h in pushop.outgoing.missingheads
+                               if h not in sch)
+        else:
+            commonheads = pushop.outgoing.missingheads
     if (obsolete._enabled and repo.obsstore and
         'obsolete' in remote.listkeys('namespaces')):
         repo.ui.status("OBSEXC: computing relevant nodes\n")
-        revs = unfi.revs('::%ln', pushop.commonheads)
+        revs = unfi.revs('::%ln', commonheads)
         common = []
         if remote.capable('_evoext_obshash_0'):
             repo.ui.status("OBSEXC: looking for common markers in %i nodes\n"
                            % len(revs))
-            common = findcommonobsmarkers(pushop.ui, repo, remote, revs)
+            common = findcommonobsmarkers(pushop.ui, unfi, remote, revs)
             revs = list(unfi.revs('%ld - (::%ln)', revs, common))
         nodes = [cl.node(r) for r in revs]
         if nodes:
@@ -2282,6 +2447,24 @@
         else:
             repo.ui.status("OBSEXC: markers already in sync\n")
             markers = []
+        return markers
+
+@eh.wrapfunction(exchange, '_pushobsolete')
+def _pushobsolete(orig, pushop):
+    """utility function to push obsolete markers to a remote"""
+    stepsdone = getattr(pushop, 'stepsdone', None)
+    if stepsdone is not None:
+        if 'obsmarkers' in stepsdone:
+            return
+        stepsdone.add('obsmarkers')
+    pushop.ui.debug('try to push obsolete markers to remote\n')
+    repo = pushop.repo
+    remote = pushop.remote
+    unfi = repo.unfiltered()
+    cl = unfi.changelog
+    if (obsolete._enabled and repo.obsstore and
+        'obsolete' in remote.listkeys('namespaces')):
+        markers = _obsmarkersdiscovery(pushop)
         if not markers:
             repo.ui.status("OBSEXC: no marker to push\n")
         elif remote.capable('_evoext_b2x_obsmarkers_0'):
--- a/tests/_exc-util.sh	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/_exc-util.sh	Wed Jul 30 13:40:40 2014 -0700
@@ -20,7 +20,7 @@
    hg ci -m "$1"
 }
 getid() {
-   hg id --hidden --debug -ir "$1"
+   hg log --hidden --template '{node}\n' --rev "$1"
 }

 setuprepos() {
--- a/tests/test-amend.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-amend.t	Wed Jul 30 13:40:40 2014 -0700
@@ -1,6 +1,4 @@
   $ cat >> $HGRCPATH <<EOF
-  > [defaults]
-  > amend=-d "0 0"
   > [extensions]
   > hgext.rebase=
   > hgext.graphlog=
@@ -17,12 +15,12 @@
   $ hg ci -Am adda
   adding a

-Test amend captures branches
+Test that amend captures branches

   $ hg branch foo
   marked working directory as branch foo
   (branches are permanent and global, did you want a bookmark?)
-  $ hg amend
+  $ hg amend -d '0 0'
   $ hg debugobsolete
   07f4944404050f47db2e5c5071e0e84e7a27bba9 6a022cbb61d5ba0f03f98ff2d36319dfea1034ae 0 {'date': '* *', 'user': 'test'} (glob)
   b2e32ffb533cbe1d5759638c0cd4e8abc43b2738 0 {'date': '* *', 'user': 'test'} (glob)
@@ -35,7 +33,7 @@

 Test no-op

-  $ hg amend
+  $ hg amend -d '0 0'
   nothing changed
   [1]
   $ glog
@@ -44,7 +42,7 @@

 Test forcing the message to the same value, no intermediate revision.

-  $ hg amend -m 'adda'
+  $ hg amend -d '0 0' -m 'adda'
   nothing changed
   [1]
   $ glog
@@ -80,4 +78,22 @@
   |
   o  2@foo(draft) adda

+Specify precise commit date with -d
+  $ hg amend -d '2001-02-03 04:05:06 +0700'
+  $ hg parents --template '{rev}  {date|date}\n'
+  5  Sat Feb 03 04:05:06 2001 +0700

+Specify "now" as commit date with -D
+  $ before=`date +%s`
+  $ hg amend -D
+  $ commit=`hg parents --template '{date|hgdate} rev{rev}\n'`
+  $ after=`date +%s`
+  $ (echo $before ; echo $commit; echo $after) | sort -k1 -n -s
+  \d+ (re)
+  \d+ 0 rev6 (re)
+  \d+ (re)
+
+Specify current user as committer with -U
+  $ HGUSER=newbie hg amend -U
+  $ hg parents --template '{rev}  {author}\n'
+  7  newbie
--- a/tests/test-evolve.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-evolve.t	Wed Jul 30 13:40:40 2014 -0700
@@ -341,6 +341,27 @@
   $ hg commit --amend -m 'dansk!'
   2 new unstable changesets

+(ninja test for the {trouble} template:
+
+  $ hg log -G --template '{rev} {troubles}\n'
+  @  13
+  |
+  | o  11 unstable
+  | |
+  | o  10 unstable
+  | |
+  | x  9
+  |/
+  o  7
+  |
+  o  6
+  |
+  o  0
+
+
+
+(/ninja)
+
   $ hg evolve --all --traceback
   move:[10] dansk 2!
   atop:[13] dansk!
@@ -518,6 +539,7 @@
   7:a5bfd90a2f29 stable
   $ echo 3 > 1
   $ hg resolve -m 1
+  (no more unresolved files)
   $ hg graft --continue -O
   grafting revision 7
   $ glog --hidden
@@ -592,26 +614,35 @@

   $ rm *.orig
   $ hg fold
-  no revision to fold
+  abort: no revisions specified
+  [255]
+  $ hg fold .
+  single revision specified, nothing to fold
   [1]
-  $ hg fold 6 --rev 10
-  abort: cannot specify both --rev and a target revision
+  $ hg fold 0::10 --rev 1 --exact
+  abort: cannot fold non-linear revisions (multiple heads given)
+  [255]
+  $ hg fold -r 4 -r 6 --exact
+  abort: cannot fold non-linear revisions (multiple roots given)
   [255]
-  $ hg fold 6 # want to run hg fold 6
-  2 changesets folded
+  $ hg fold 10 1
+  abort: cannot fold non-linear revisions
+  (given revisions are unrelated to parent of working directory)
+  [255]
+  $ hg phase --public 0
+  $ hg fold -r 0
+  abort: cannot fold public revisions
+  [255]
+  $ hg fold -r 5
+  3 changesets folded
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
-  $ glog
-  @  11:dd4682c1a481@default(draft) add 1
-  |
-  o  5:0b9e50c35132@default(draft) add 3
-  |
-  o  4:ce341209337f@default(draft) add 4
-  |
-  | o  1:73d38bb17fd7@default(draft) add 1
-  |/
-  o  0:8685c6d34325@default(draft) add 0
+  $ hg fold 6 # want to run hg fold 6
+  abort: unknown revision '6'!
+  [255]
+  $ hg log -r 11 --template '{desc}\n'
+  add 3

-  $ hg log -r 11 --template '{desc}\n'
+
   add 1


@@ -623,15 +654,15 @@

   $ hg up 4
   0 files updated, 0 files merged, 2 files removed, 0 files unresolved
-  $ hg fold --rev 4::11 --user victor
-  3 changesets folded
+  $ hg fold --rev 4::11 --user victor --exact
+  2 changesets folded
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ glog
   @  12:d26d339c513f@default(draft) add 4
   |
   | o  1:73d38bb17fd7@default(draft) add 1
   |/
-  o  0:8685c6d34325@default(draft) add 0
+  o  0:8685c6d34325@default(public) add 0

   $ hg log --template '{rev}: {author}\n'
   12: victor
@@ -655,8 +686,7 @@

   $ hg olog
   4	: add 4 - test
-  5	: add 3 - test
-  11	: add 1 - test
+  11	: add 3 - test

 Test obsstore stat
--- a/tests/test-exchange-A1.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-A1.t	Wed Jul 30 13:40:40 2014 -0700
@@ -54,8 +54,8 @@
   $ cp -r A.1.1 A.1.1.b


-Variante a: push -r A
----------------------
+Variant a: push -r A
+--------------------

   $ dotest A.1.1.a A
   ## Running testcase A.1.1.a
@@ -105,8 +105,8 @@


-Variante b: push
----------------------
+Variant b: push
+---------------

   $ dotest A.1.1.b
   ## Running testcase A.1.1.b
@@ -213,8 +213,8 @@
   $ cp -r A.1.2 A.1.2.b


-Variante a: push -r A
----------------------
+Variant a: push -r A
+--------------------

   $ dotest A.1.2.a B
   ## Running testcase A.1.2.a
@@ -261,8 +261,8 @@
   # obstore: pulldest
   aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa f5bc6836db60e308a17ba08bf050154ba9c4fad7 0 {'date': '', 'user': 'test'}

-Variante b: push
----------------------
+Variant b: push
+---------------

   $ dotest A.1.2.b
   ## Running testcase A.1.2.b
--- a/tests/test-exchange-A3.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-A3.t	Wed Jul 30 13:40:40 2014 -0700
@@ -73,8 +73,8 @@
   $ cd ..
   $ cd ..

-Actual Test for first version (changeset unknown remotly)
----------------------------------------------------------
+Actual Test for first version (changeset unknown in remote)
+-----------------------------------------------------------

   $ dotest A.3.a A1
   ## Running testcase A.3.a
@@ -125,8 +125,8 @@
   28b51eb45704506b5c603decd6bf7ac5e0f6a52f e5ea8f9c73143125d36658e90ef70c6d2027a5b7 0 {'date': '', 'user': 'test'}


-other variant: changeset know remotly
--------------------------------------------
+other variant: changeset known in remote
+----------------------------------------

   $ setuprepos A.3.b
   creating test repo for test case A.3.b
@@ -164,8 +164,8 @@
   $ cd ..
   $ cd ..

-Actual Test for first version (changeset unknown remotly)
----------------------------------------------------------
+Actual Test for first version (changeset unknown in remote)
+-----------------------------------------------------------

 check it complains about multiple heads
--- a/tests/test-exchange-A4.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-A4.t	Wed Jul 30 13:40:40 2014 -0700
@@ -66,8 +66,8 @@
   $ cd ..
   $ cd ..

-Actual Test for first version (changeset unknown remotly)
----------------------------------------------------------
+Actual Test for first version (changeset unknown in remote)
+-----------------------------------------------------------

   $ dotest A.4 B -f
   ## Running testcase A.4
--- a/tests/test-exchange-A5.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-A5.t	Wed Jul 30 13:40:40 2014 -0700
@@ -54,7 +54,6 @@
   $ hg debugobsolete aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa `getid 'desc(A0)'`
   $ hg debugobsolete `getid 'desc(B0)'` `getid 'desc(B1)'`
   $ hg debugobsolete `getid 'desc(A0)'` `getid 'desc(A1)'`
-  invalid branchheads cache (served): tip differs
   $ hg log -G --hidden
   @  8c0a98c83722 (draft): A1
   |
--- a/tests/test-exchange-A6.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-A6.t	Wed Jul 30 13:40:40 2014 -0700
@@ -42,7 +42,7 @@
   $ mkcommit A1
   created new head

-make both changeset known remotly
+make both changeset known in remote

   $ hg push -qf ../pushdest
   $ hg push -qf ../pulldest
@@ -106,7 +106,7 @@
   28b51eb45704506b5c603decd6bf7ac5e0f6a52f e5ea8f9c73143125d36658e90ef70c6d2027a5b7 0 {'date': '', 'user': 'test'}

 Actual Test (bare push version)
------------------------------------
+-------------------------------

   $ dotest A.6.b
   ## Running testcase A.6.b
--- a/tests/test-exchange-B1.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-B1.t	Wed Jul 30 13:40:40 2014 -0700
@@ -3,7 +3,7 @@

   $ . $TESTDIR/_exc-util.sh

-=== B.1 Prune on non targeted common changeset ===
+=== B.1 Prune on non-targeted common changeset ===

 .. {{{
 ..     ⊗ B
@@ -53,7 +53,7 @@
   $ cp -r B.1 B.1.a
   $ cp -r B.1 B.1.b

-Actual Test (explicite push version)
+Actual Test (explicit push version)
 -----------------------------------

   $ dotest B.1.a A
--- a/tests/test-exchange-B2.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-B2.t	Wed Jul 30 13:40:40 2014 -0700
@@ -3,7 +3,7 @@

   $ . $TESTDIR/_exc-util.sh

-=== B.2 Pruned changeset on head. nothing pushed ===
+=== B.2 Pruned changeset on head: nothing pushed ===

 .. {{{
 ..     ⊗ A
@@ -48,7 +48,7 @@
   $ cp -r B.2 B.2.a
   $ cp -r B.2 B.2.b

-Actual Test (explicite push version)
+Actual Test (explicit push version)
 -----------------------------------

   $ dotest B.2.a O
--- a/tests/test-exchange-B4.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-B4.t	Wed Jul 30 13:40:40 2014 -0700
@@ -74,7 +74,7 @@
   $ cp -r B.4 B.4.a
   $ cp -r B.4 B.4.b

-Actual Test (explicite push version)
+Actual Test (explicit push version)
 -----------------------------------

   $ dotest B.4.a O
--- a/tests/test-exchange-B5.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-B5.t	Wed Jul 30 13:40:40 2014 -0700
@@ -72,8 +72,8 @@
   $ cp -r B.5 B.5.a
   $ cp -r B.5 B.5.b

-Actual Test (explicite push version)
--------------------------------------
+Actual Test (explicit push version)
+-----------------------------------

   $ dotest B.5.a B -f
   ## Running testcase B.5.a
--- a/tests/test-exchange-B7.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-B7.t	Wed Jul 30 13:40:40 2014 -0700
@@ -4,7 +4,7 @@
   $ . $TESTDIR/_exc-util.sh


-=== B.7 Prune on non targeted common changeset ===
+=== B.7 Prune on non-targeted common changeset ===
 ..
 .. {{{
 ..     ⊗ B
--- a/tests/test-exchange-C1.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-C1.t	Wed Jul 30 13:40:40 2014 -0700
@@ -54,8 +54,8 @@
   $ cp -r C.1 C.1.a
   $ cp -r C.1 C.1.b

-Actual Test (explicite push)
--------------------------------------
+Actual Test (explicit push)
+---------------------------

   $ dotest C.1.a O
   ## Running testcase C.1.a
--- a/tests/test-exchange-C2.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-C2.t	Wed Jul 30 13:40:40 2014 -0700
@@ -61,8 +61,8 @@
   $ cp -r C.2 C.2.a
   $ cp -r C.2 C.2.b

-Actual Test (explicite push)
--------------------------------------
+Actual Test (explicit push)
+---------------------------

   $ dotest C.2.a A1
   ## Running testcase C.2.a
--- a/tests/test-exchange-C3.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-C3.t	Wed Jul 30 13:40:40 2014 -0700
@@ -66,8 +66,8 @@
   $ cp -r C.3 C.3.a
   $ cp -r C.3 C.3.b

-Actual Test (explicite push)
--------------------------------------
+Actual Test (explicit push)
+---------------------------

   $ dotest C.3.a O
   ## Running testcase C.3.a
--- a/tests/test-exchange-C4.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-C4.t	Wed Jul 30 13:40:40 2014 -0700
@@ -56,7 +56,6 @@
   created new head
   $ hg debugobsolete --hidden `getid 'desc(A)'` `getid 'desc(B)'`
   $ hg debugobsolete --hidden `getid 'desc(A)'` `getid 'desc(C)'`
-  invalid branchheads cache (served): tip differs
   $ hg prune -qd '0 0' .
   $ hg log -G --hidden
   x  7f7f229b13a6 (draft): C
--- a/tests/test-exchange-D1.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-D1.t	Wed Jul 30 13:40:40 2014 -0700
@@ -3,7 +3,7 @@

   $ . $TESTDIR/_exc-util.sh

-=== D.1 Pruned changeset based on a missing precursors of something we miss ===
+=== D.1 Pruned changeset based on missing precursor of something not present ===

 .. {{{
 ..   B ⊗
--- a/tests/test-exchange-D4.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-exchange-D4.t	Wed Jul 30 13:40:40 2014 -0700
@@ -49,7 +49,6 @@
   $ hg debugobsolete aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa `getid 'desc(A1)'`
   $ hg debugobsolete `getid 'desc(B0)'` bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
   $ hg debugobsolete bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb `getid 'desc(B1)'`
-  invalid branchheads cache (served): tip differs
   $ hg log -G --hidden
   @  069b05c3876d (draft): B1
   |
@@ -69,8 +68,8 @@
   $ cd ..
   $ cd ..

-Actual Test for first version (changeset unknown remotly)
----------------------------------------------------------
+Actual Test for first version (changeset unknown in remote)
+-----------------------------------------------------------

   $ dotest A.3.a A1
   ## Running testcase A.3.a
--- a/tests/test-import.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-import.t	Wed Jul 30 13:40:40 2014 -0700
@@ -1,6 +1,6 @@

 This feature requires mercurial 3.0
-(and the `only(` revset is 3.0 specific)
+(and the `only()` revset is 3.0 specific)

   $ (hg help revset | grep '"only(' > /dev/null) || exit 80
--- a/tests/test-obsolete.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-obsolete.t	Wed Jul 30 13:40:40 2014 -0700
@@ -65,7 +65,7 @@
   2
   - 4538525df7e2

-Test that obsolete parent a properly computed
+Test that obsolete precursors are properly computed

   $ qlog -r 'precursors(.)' --hidden
   2
@@ -85,13 +85,13 @@
   @@ -0,0 +1,1 @@
   +obsol_c

-Test that obsolete successors a properly computed
+Test that obsolete successors are properly computed

   $ qlog -r 'successors(2)' --hidden
   3
   - 0d3f46688ccc

-test obsolete changeset with no-obsolete descendant
+test obsolete changeset with non-obsolete descendant
   $ hg up 1 -q
   $ mkcommit "obsol_c'" # 4 (on 1)
   created new head
@@ -257,7 +257,7 @@
   2
   - 0d3f46688ccc

-Pushing again does not advertise extinct changeset
+Pushing again does not advertise extinct changesets

   $ hg push ../other-new
   pushing to ../other-new
@@ -299,9 +299,9 @@
   0
   - 1f0dee641bb7

-pushing to stuff that doesn't support obsolete
+pushing to stuff that doesn't support obsolescence

-DISABLED. the _enable switch it global :-/
+DISABLED. the _enable switch is global :-/

 ..  $ hg init ../other-old
 ..  > # XXX I don't like this but changeset get published otherwise
@@ -464,7 +464,7 @@
   0
   - 1f0dee641bb7

-Check that auto update ignore hidden changeset
+Check that auto update ignores hidden changeset
   $ hg up 0
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ hg up
@@ -472,7 +472,7 @@
   $ hg id -n
   8

-Check that named update do too
+Check that named update does too

   $ hg update default
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
@@ -495,33 +495,36 @@
   o  0 - 1f0dee641bb7 add a


-  $ hg log -G  --template='{rev} - {node|short}\n' --hidden
-  x  9 - 83b5778897ad
+  $ hg log -G  --template='{rev} - {node|short} {desc}\n' --hidden
+  x  9 - 83b5778897ad add toto

-  o  8 - 159dfc9fa5d3
+  o  8 - 159dfc9fa5d3 add obsol_d''
   |
-  | x  7 - 909a0fb57e5d
+  | x  7 - 909a0fb57e5d add obsol_d'
   |/
-  | x  6 - 95de7fc6918d
+  | x  6 - 95de7fc6918d add obsol_d
   |/
-  | x  5 - a7a6f2b5d8a5
+  | x  5 - a7a6f2b5d8a5 add d
   |/
-  | o  4 - 725c380fe99b
+  | o  4 - 725c380fe99b add obsol_c'
   | |
-  x |  3 - 0d3f46688ccc
+  x |  3 - 0d3f46688ccc add obsol_c
   |/
-  | x  2 - 4538525df7e2
+  | x  2 - 4538525df7e2 add c
   |/
-  o  1 - 7c3bad9141dc
+  o  1 - 7c3bad9141dc add b
   |
-  o  0 - 1f0dee641bb7
+  o  0 - 1f0dee641bb7 add a


-should not rebase extinct changeset
+should not rebase extinct changesets

 #excluded 'whole rebase set is extinct and ignored.' message not in core
   $ hg rebase -b '3' -d 4 --traceback
   2 new divergent changesets
+  $ hg --hidden log -q -r 'successors(3)'
+  4:725c380fe99b
+  10:2033b4e49474
   $ hg up tip
   ? files updated, 0 files merged, 0 files removed, 0 files unresolved (glob)
   $ hg log -G --template='{rev} - {node|short} {desc}\n'
@@ -537,7 +540,7 @@


 Does not complain about new head if you obsolete the old one
-(re necesarry when we start runnind discovery on unfiltered repo in core)
+(re necessary when we start running discovery on unfiltered repo in core)

   $ hg push ../other-new --traceback
   pushing to ../other-new
--- a/tests/test-prev-next.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-prev-next.t	Wed Jul 30 13:40:40 2014 -0700
@@ -48,6 +48,7 @@
      no-move                   2:4e26ef31f919
   $ hg up 1
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  (leaving bookmark mark)
   $ hg next
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   [2] added c
--- a/tests/test-prune.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-prune.t	Wed Jul 30 13:40:40 2014 -0700
@@ -41,11 +41,12 @@
   $ hg prune --user blah --date '1979-12-15' .
   1 changesets pruned
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  (leaving bookmark BABAR)
   working directory now at 47d2a3944de8
   $ hg debugobsolete
   9d206ffc875e1bc304590549be293be36821e66c 0 {'date': '314064000 0', ('p1': '47d2a3944de8b013de3be9578e8e344ea2e6c097', )?'user': 'blah'} (re)

-prune leaving unstability behind
+prune leaving instability behind

   $ hg prune 1
   1 changesets pruned
@@ -236,6 +237,7 @@
   $ hg bookmark -r 'c' 'delete'
   $ hg up -C todelete
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  (activating bookmark todelete)
   $ hg prune -B nostrip
   bookmark 'nostrip' deleted
   abort: nothing to prune
@@ -244,6 +246,7 @@
   $ hg prune -B todelete
   1 changesets pruned
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  (leaving bookmark todelete)
   working directory now at d62d843c9a01
   bookmark 'todelete' deleted
   $ hg id -ir dcbb326fdec2
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-sharing.t	Wed Jul 30 13:40:40 2014 -0700
@@ -0,0 +1,314 @@
+Test script based on sharing.rst: ensure that all scenarios in that
+document work as advertised.
+
+Setting things up
+
+  $ cat >> $HGRCPATH <<EOF
+  > [alias]
+  > shortlog = log --template '{rev}:{node|short}  {phase}  {desc|firstline}\n'
+  > [extensions]
+  > rebase =
+  > EOF
+  $ echo "evolve=$(echo $(dirname $TESTDIR))/hgext/evolve.py" >> $HGRCPATH
+  $ hg init public
+  $ hg clone -q public test-repo
+  $ hg clone -q test-repo dev-repo
+  $ cat >> test-repo/.hg/hgrc <<EOF
+  > [phases]
+  > publish = false
+  > EOF
+
+To start things off, let's make one public, immutable changeset::
+
+  $ cd test-repo
+  $ echo 'my new project' > file1
+  $ hg add file1
+  $ hg commit -m'create new project'
+  $ hg push -q
+
+and pull that into the development repository::
+
+  $ cd ../dev-repo
+  $ hg pull -q -u
+
+Let's commit a preliminary change and push it to ``test-repo`` for
+testing. ::
+
+  $ echo 'fix fix fix' > file1
+  $ hg commit -m'prelim change'
+  $ hg push -q ../test-repo
+
+Figure SG01 (roughly)
+  $ hg shortlog -G
+  @  1:f6490818a721  draft  prelim change
+  |
+  o  0:0dc9c9f6ab91  public  create new project
+
+Now let's switch to test-repo to test our change and amend::
+  $ cd ../test-repo
+  $ hg update -q
+  $ echo 'Fix fix fix.' > file1
+  $ hg amend -m'fix bug 37'
+
+Figure SG02
+  $ hg shortlog --hidden -G
+  @  3:60ffde5765c5  draft  fix bug 37
+  |
+  | x  2:2a039763c0f4  draft  temporary amend commit for f6490818a721
+  | |
+  | x  1:f6490818a721  draft  prelim change
+  |/
+  o  0:0dc9c9f6ab91  public  create new project
+
+Pull into dev-repo: obsolescence markers are transferred, but not
+the new obsolete changeset.
+  $ cd ../dev-repo
+  $ hg pull -q -u
+
+Figure SG03
+  $ hg shortlog --hidden -G
+  @  2:60ffde5765c5  draft  fix bug 37
+  |
+  | x  1:f6490818a721  draft  prelim change
+  |/
+  o  0:0dc9c9f6ab91  public  create new project
+
+Amend again in dev-repo
+  $ echo 'Fix, fix, and fix.' > file1
+  $ hg amend
+  $ hg push -q
+
+Figure SG04 (dev-repo)
+  $ hg shortlog --hidden -G
+  @  4:de6151c48e1c  draft  fix bug 37
+  |
+  | x  3:ad19d3570adb  draft  temporary amend commit for 60ffde5765c5
+  | |
+  | x  2:60ffde5765c5  draft  fix bug 37
+  |/
+  | x  1:f6490818a721  draft  prelim change
+  |/
+  o  0:0dc9c9f6ab91  public  create new project
+
+Figure SG04 (test-repo)
+  $ cd ../test-repo
+  $ hg update -q
+  $ hg shortlog --hidden -G
+  @  4:de6151c48e1c  draft  fix bug 37
+  |
+  | x  3:60ffde5765c5  draft  fix bug 37
+  |/
+  | x  2:2a039763c0f4  draft  temporary amend commit for f6490818a721
+  | |
+  | x  1:f6490818a721  draft  prelim change
+  |/
+  o  0:0dc9c9f6ab91  public  create new project
+
+This bug fix is finished. We can push it to the public repository.
+  $ hg push
+  pushing to $TESTTMP/public
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  OBSEXC: computing relevant nodes
+  OBSEXC: computing markers relevant to 2 nodes
+  OBSEXC: pushing 4 markers (341 bytes)
+  OBSEXC: DONE
+
+Figure SG05
+  $ hg -R ../public shortlog -G
+  o  1:de6151c48e1c  public  fix bug 37
+  |
+  o  0:0dc9c9f6ab91  public  create new project
+
+Oops, still have draft changesets in dev-repo.
+  $ cd ../dev-repo
+  $ hg shortlog -r 'draft()'
+  4:de6151c48e1c  draft  fix bug 37
+  $ hg pull -q -u
+  $ hg shortlog -r 'draft()'
+
+Sharing by Alice and Bob to demonstrate bumped and divergent changesets.
+First, setup repos for them.
+
+  $ cd ..
+  $ hg clone -q public alice
+  $ hg clone -q public bob
+  $ cat >> alice/.hg/hgrc <<EOF
+  > [phases]
+  > publish = false
+  > EOF
+  $ cp alice/.hg/hgrc bob/.hg/hgrc
+
+Alice commits a bug fix.
+  $ cd alice
+  $ echo 'fix' > file2
+  $ hg commit -q -A -u alice -m 'fix bug 15'
+
+Bob pulls and amends Alice's fix.
+  $ cd ../bob
+  $ hg pull -q -u ../alice
+  $ echo 'Fix.' > file2
+  $ hg amend -q -A -u bob -m 'fix bug 15 (amended)'
+
+Figure SG06: Bob's repository after amending Alice's fix.
+(Nothing new here; we could have seen this in the user guide.
+  $ hg --hidden shortlog -G
+  @  4:fe884dfac355  draft  fix bug 15 (amended)
+  |
+  | x  3:0376cac226f8  draft  temporary amend commit for e011baf925da
+  | |
+  | x  2:e011baf925da  draft  fix bug 15
+  |/
+  o  1:de6151c48e1c  public  fix bug 37
+  |
+  o  0:0dc9c9f6ab91  public  create new project
+
+
+But in the meantime, Alice decides the fix is just fine and publishes it.
+  $ cd ../alice
+  $ hg push -q
+
+Which means that Bob now has an formerly obsolete changeset that is
+also public (2:6e83). As soon as he pulls its phase change, he's got
+trouble: the successors of that formerly obsolete changeset are
+bumped.
+
+  $ cd ../bob
+  $ hg --hidden shortlog -r 'obsolete()'
+  2:e011baf925da  draft  fix bug 15
+  3:0376cac226f8  draft  temporary amend commit for e011baf925da
+  $ hg pull -q -u
+  1 new bumped changesets
+  $ hg --hidden shortlog -r 'obsolete()'
+  3:0376cac226f8  draft  temporary amend commit for e011baf925da
+  $ hg shortlog -r 'bumped()'
+  4:fe884dfac355  draft  fix bug 15 (amended)
+
+Figure SG07: Bob's repo with one bumped changeset (rev 4:c02d)
+  $ hg --hidden shortlog -G
+  @  4:fe884dfac355  draft  fix bug 15 (amended)
+  |
+  | x  3:0376cac226f8  draft  temporary amend commit for e011baf925da
+  | |
+  | o  2:e011baf925da  public  fix bug 15
+  |/
+  o  1:de6151c48e1c  public  fix bug 37
+  |
+  o  0:0dc9c9f6ab91  public  create new project
+
+
+Bob gets out of trouble by evolving the repository.
+  $ hg evolve --all
+  recreate:[4] fix bug 15 (amended)
+  atop:[2] fix bug 15
+  computing new diff
+  committed as 227d860d9ad0
+
+Figure SG08
+  $ hg --hidden shortlog -G
+  @  5:227d860d9ad0  draft  bumped update to e011baf925da:
+  |
+  | x  4:fe884dfac355  draft  fix bug 15 (amended)
+  | |
+  +---x  3:0376cac226f8  draft  temporary amend commit for e011baf925da
+  | |
+  o |  2:e011baf925da  public  fix bug 15
+  |/
+  o  1:de6151c48e1c  public  fix bug 37
+  |
+  o  0:0dc9c9f6ab91  public  create new project
+
+
+Throw away Bob's messy repo and start over.
+  $ cd ..
+  $ rm -rf bob
+  $ cp -rp alice bob
+
+Bob commits a pretty good fix that both he and Alice will amend,
+leading to divergence.
+  $ cd bob
+  $ echo 'pretty good fix' >> file1
+  $ hg commit -u bob -m 'fix bug 24 (v1)'
+
+Alice pulls Bob's fix and improves it.
+  $ cd ../alice
+  $ hg pull -q -u ../bob
+  $ echo 'better (alice)' >> file1
+  $ hg amend -u alice -m 'fix bug 24 (v2 by alice)'
+
+Likewise, Bob amends his own fix. Now we have an obsolete changeset
+with two successors, although the successors are in different repos.
+  $ cd ../bob
+  $ echo 'better (bob)' >> file1
+  $ hg amend -u bob -m 'fix bug 24 (v2 by bob)'
+
+Bob pulls from Alice's repo and discovers the trouble: divergent changesets!
+  $ hg pull -q -u ../alice
+  not updating: not a linear update
+  (merge or update --check to force update)
+  2 new divergent changesets
+  $ hg shortlog -r 'divergent()'
+  5:fc16901f4d7a  draft  fix bug 24 (v2 by bob)
+  6:694fd0f6b503  draft  fix bug 24 (v2 by alice)
+
+Figure SG09
+  $ hg --hidden shortlog -G
+  o  6:694fd0f6b503  draft  fix bug 24 (v2 by alice)
+  |
+  | @  5:fc16901f4d7a  draft  fix bug 24 (v2 by bob)
+  |/
+  | x  4:162612d3335b  draft  temporary amend commit for fe81d904ed08
+  | |
+  | x  3:fe81d904ed08  draft  fix bug 24 (v1)
+  |/
+  o  2:e011baf925da  public  fix bug 15
+  |
+  o  1:de6151c48e1c  public  fix bug 37
+  |
+  o  0:0dc9c9f6ab91  public  create new project
+
+Merge the trouble away.
+  $ hg merge --tool internal:local
+  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
+  (branch merge, don't forget to commit)
+  $ hg commit -m merge
+  $ hg shortlog -G
+  @    7:b1d30ba26e44  draft  merge
+  |\
+  | o  6:694fd0f6b503  draft  fix bug 24 (v2 by alice)
+  | |
+  o |  5:fc16901f4d7a  draft  fix bug 24 (v2 by bob)
+  |/
+  o  2:e011baf925da  public  fix bug 15
+  |
+  o  1:de6151c48e1c  public  fix bug 37
+  |
+  o  0:0dc9c9f6ab91  public  create new project
+
+  $ hg log -q -r 'divergent()'
+  5:fc16901f4d7a
+  6:694fd0f6b503
+
+# XXX hg evolve does not solve this trouble! bug in evolve?
+#Evolve the trouble away.
+#  $ hg evolve --all --tool=internal:local
+#  merge:[5] fix bug 24 (v2 by bob)
+#  with: [6] fix bug 24 (v2 by alice)
+#  base: [3] fix bug 24 (v1)
+#  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
+#  $ hg status
+#  $ hg shortlog -G
+#  o  6:694fd0f6b503  draft  fix bug 24 (v2 by alice)
+#  |
+#  | @  5:fc16901f4d7a  draft  fix bug 24 (v2 by bob)
+#  |/
+#  o  2:e011baf925da  public  fix bug 15
+#  |
+#  o  1:de6151c48e1c  public  fix bug 37
+#  |
+#  o  0:0dc9c9f6ab91  public  create new project
+#
+#  $ hg --hidden shortlog -G
--- a/tests/test-stabilize-conflict.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-stabilize-conflict.t	Wed Jul 30 13:40:40 2014 -0700
@@ -1,6 +1,6 @@
-=================================================================
-This files test the proper behavior of evo during merge conflict.
-=================================================================
+=========================================================
+Test the proper behavior of evolve during merge conflict.
+=========================================================

 Initial setup

@@ -164,6 +164,7 @@
   reverting babar
   $ safesed 's/dix/ten/' babar
   $ hg resolve --all -m
+  (no more unresolved files)
   $ hg evolve --continue
   grafting revision 5
   $ hg resolve -l
@@ -185,8 +186,8 @@
      date:        Thu Jan 01 00:00:00 1970 +0000
      summary:     babar count up to five

-proper behavior with conflict using an external merge tools
------------------------------------------------------------
+proper behavior with conflict using an external merge tool
+----------------------------------------------------------

   $ safesed 's/merge=.*/merge=touch/' $HGRCPATH
   $ safesed 's/touch.gui=.*/touch.gui=false/' $HGRCPATH
@@ -208,7 +209,7 @@
   $ hg amend
   1 new unstable changesets
   $ safesed 's/interactive=.*/interactive=true/' $HGRCPATH
-  $ HGMERGE=touch hg evolve <<EOF
+  $ hg evolve --tool touch <<EOF
   > n
   > EOF
   move:[8] babar count up to fifteen
--- a/tests/test-stabilize-order.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-stabilize-order.t	Wed Jul 30 13:40:40 2014 -0700
@@ -85,7 +85,7 @@
   o  0:c471ef929e6a@default(draft) addroot


-Test stabilizing a descendant predecessors child
+Test stabilizing a descendant predecessor's child

   $ hg up 7
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
--- a/tests/test-stabilize-result.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-stabilize-result.t	Wed Jul 30 13:40:40 2014 -0700
@@ -25,6 +25,7 @@
   $ hg bookmark changea
   $ hg up 1
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  (leaving bookmark changea)
   $ echo a >> a
   $ hg amend -m changea
   1 new unstable changesets
@@ -94,13 +95,14 @@
   abort: unresolved merge conflicts (see hg help resolve)
   [255]
   $ hg resolve -m a
+  (no more unresolved files)
   $ hg evolve --continue
   grafting revision 5

-Stabilize of late comer with different parent
-==================================================
+Stabilize latecomer with different parent
+=========================================

-(the same parent case is handled in test-evolve.t)
+(the same-parent case is handled in test-evolve.t)

   $ glog
   @  8:1cf0aacfd363@default(draft) bk:[] newer a
@@ -146,7 +148,7 @@
   o  0:07f494440405@default(public) bk:[] adda


-Stabilize !
+Stabilize!

   $ hg evolve --any --dry-run
   recreate:[12] newer a
@@ -173,8 +175,8 @@
   o  0:07f494440405@default(public) bk:[] adda


-Stabilize divergenent changesets with same parent
-=================================================
+Stabilize divergent changesets with same parent
+===============================================

   $ rm a.orig
   $ hg up 9
@@ -228,7 +230,7 @@
   o  0:07f494440405@default(public) bk:[] adda


-Stabilize It
+Stabilize it

   $ hg evolve -qn --traceback
   hg update -c eacc9c8240fe &&
--- a/tests/test-tutorial.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-tutorial.t	Wed Jul 30 13:40:40 2014 -0700
@@ -473,21 +473,24 @@
 The tutorial part is not written yet but can use `hg fold`:

   $ hg help fold
-  hg fold rev
+  hg fold [OPTION]... [-r] REV

   aliases: squash

-  Fold multiple revisions into a single one
+  fold multiple revisions into a single one

-      The revisions from your current working directory to the given one are
-      folded into a single successor revision.
+      Folds a set of revisions with the parent of the working directory. All
+      revisions linearly between the given revisions and the parent of the
+      working directory will also be folded.

-      you can alternatively use --rev to explicitly specify revisions to be
-      folded, ignoring the current working directory parent.
+      Use --exact for folding only the specified revisions while ignoring the
+      parent of the working directory. In this case, the given revisions must
+      form a linear unbroken chain.

   options:

-   -r --rev VALUE [+] explicitly specify the full set of revision to fold
+   -r --rev VALUE [+] revision to fold
+      --exact         only fold specified revisions
    -m --message TEXT  use text as commit message
    -l --logfile FILE  read commit message from file
    -d --date DATE     record the specified date as commit date
@@ -495,7 +498,7 @@

   [+] marked option can be specified multiple times

-  use "hg -v help fold" to show the global options
+  use "hg -v help fold" to show more complete help and the global options


 -----------------------
--- a/tests/test-uncommit.t	Wed Jul 30 13:38:33 2014 -0700
+++ b/tests/test-uncommit.t	Wed Jul 30 13:40:40 2014 -0700
@@ -152,6 +152,7 @@

   $ hg uncommit
   abort: nothing to uncommit
+  (use --all to uncommit all files)
   [255]
   $ hg bookmarks
    * touncommit-bm             3:5eb72dbe0cb4
@@ -162,6 +163,7 @@

   $ hg uncommit --include nothere
   abort: nothing to uncommit
+  (use --all to uncommit all files)
   [255]

 Enjoy uncommit
@@ -238,6 +240,7 @@

   $ hg up -C 3 --hidden
   8 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  (leaving bookmark touncommit-bm)
   working directory parent is obsolete!
   $ hg --config extensions.purge= purge
   $ hg uncommit -I 'set:added() and e'
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-userguide.t	Wed Jul 30 13:40:40 2014 -0700
@@ -0,0 +1,316 @@
+ensure that all the scenarios in the user guide work as documented
+
+basic repo
+  $ hg init t
+  $ cd t
+  $ touch file1.c file2.c
+  $ hg -q commit -A -m init
+
+example 1: commit creates a changeset in draft phase
+(this is nothing to do with evolve, but it's mentioned in the user guide)
+  $ echo 'feature Y' >> file1.c
+  $ hg commit -u alice -d '0 0' -m 'implement feature X'
+  $ hg phase -r .
+  1: draft
+  $ hg identify -in
+  6e725fd2be6f 1
+
+example 2: unsafe amend with plain vanilla Mercurial: the original
+commit is stripped
+  $ hg commit --amend -u alice -d '1 0' -m 'implement feature Y'
+  saved backup bundle to $TESTTMP/t/.hg/strip-backup/6e725fd2be6f-amend-backup.hg
+  $ hg log -r 23fe4ac6d3f1
+  abort: unknown revision '23fe4ac6d3f1'!
+  [255]
+  $ hg identify -in
+  fe0ecd3bd2a4 1
+
+enable evolve for safe history modification
+  $ cat >> $HGRCPATH <<EOF
+  > [alias]
+  > shortlog = log --template '{rev}:{node|short}  {phase}  {desc|firstline}\n'
+  > [extensions]
+  > rebase =
+  > EOF
+  $ echo "evolve=$(echo $(dirname $TESTDIR))/hgext/evolve.py" >> $HGRCPATH
+
+example 3: safe amend with "hg commit --amend" (figure 2)
+  $ echo 'tweak feature Y' >> file1.c
+  $ hg commit --amend -u alice -d '2 0' -m 'implement feature Y'
+  $ hg shortlog -q -r fe0ecd3bd2a4
+  abort: unknown revision 'fe0ecd3bd2a4'!
+  [255]
+  $ hg --hidden shortlog -G
+  @  3:934359450037  draft  implement feature Y
+  |
+  | x  2:6c5f78d5d467  draft  temporary amend commit for fe0ecd3bd2a4
+  | |
+  | x  1:fe0ecd3bd2a4  draft  implement feature Y
+  |/
+  o  0:08c4b6f4efc8  draft  init
+
+example 3 redux: repeat safe amend, this time with "hg amend"
+  $ hg rollback -q
+  $ hg amend -u alice -d '2 0' -m 'implement feature Y'
+  $ hg --hidden shortlog -G
+  @  3:934359450037  draft  implement feature Y
+  |
+  | x  2:6c5f78d5d467  draft  temporary amend commit for fe0ecd3bd2a4
+  | |
+  | x  1:fe0ecd3bd2a4  draft  implement feature Y
+  |/
+  o  0:08c4b6f4efc8  draft  init
+
+example 4: prune at head (figure 3)
+  $ echo 'debug hack' >> file1.c
+  $ hg commit -m 'debug hack'
+  $ hg prune .
+  1 changesets pruned
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  working directory now at 934359450037
+  $ hg parents --template '{rev}:{node|short}  {desc|firstline}\n'
+  3:934359450037  implement feature Y
+  $ hg --hidden shortlog -G -r 3:
+  x  4:a3e0ef24aaf0  draft  debug hack
+  |
+  @  3:934359450037  draft  implement feature Y
+  |
+
+example 5: uncommit files at head (figure 4)
+  $ echo 'relevant' >> file1.c
+  $ echo 'irrelevant' >> file2.c
+  $ hg commit -u dan -d '10 0' -m 'fix bug 234'
+  $ hg uncommit file2.c
+  $ hg status
+  M file2.c
+  $ hg --hidden shortlog -G -r 'descendants(3) - 4'
+  @  6:c8defeecf7a4  draft  fix bug 234
+  |
+  | x  5:da4331967f5f  draft  fix bug 234
+  |/
+  o  3:934359450037  draft  implement feature Y
+  |
+  $ hg parents --template '{rev}:{node|short}  {desc|firstline}\n{files}\n'
+  6:c8defeecf7a4  fix bug 234
+  file1.c
+  $ hg revert --no-backup file2.c
+
+example 6: fold multiple changesets together into one (figure 5)
+  $ echo step1 >> file1.c
+  $ hg commit -m 'step 1'
+  $ echo step2 >> file1.c
+  $ hg commit -m 'step 2'
+  $ echo step3 >> file2.c
+  $ hg commit -m 'step 3'
+  $ hg log --template '{rev}:{node|short}  {desc|firstline}\n' -r 7::
+  7:05e61aab8294  step 1
+  8:be6d5bc8e4cc  step 2
+  9:35f432d9f7c1  step 3
+  $ hg fold -d '0 0' -m 'fix bug 64' -r 7::
+  3 changesets folded
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg --hidden shortlog -G -r 6::
+  @  10:171c6a79a27b  draft  fix bug 64
+  |
+  | x  9:35f432d9f7c1  draft  step 3
+  | |
+  | x  8:be6d5bc8e4cc  draft  step 2
+  | |
+  | x  7:05e61aab8294  draft  step 1
+  |/
+  o  6:c8defeecf7a4  draft  fix bug 234
+  |
+  $ hg --hidden log -q -r 'successors(7) | successors(8) | successors(9)'
+  10:171c6a79a27b
+  $ hg --hidden log -q -r 'precursors(10)'
+  7:05e61aab8294
+  8:be6d5bc8e4cc
+  9:35f432d9f7c1
+  $ hg diff -c 10 -U 0
+  diff -r c8defeecf7a4 -r 171c6a79a27b file1.c
+  --- a/file1.c	Thu Jan 01 00:00:10 1970 +0000
+  +++ b/file1.c	Thu Jan 01 00:00:00 1970 +0000
+  @@ -3,0 +4,2 @@
+  +step1
+  +step2
+  diff -r c8defeecf7a4 -r 171c6a79a27b file2.c
+  --- a/file2.c	Thu Jan 01 00:00:10 1970 +0000
+  +++ b/file2.c	Thu Jan 01 00:00:00 1970 +0000
+  @@ -0,0 +1,1 @@
+  +step3
+
+setup for example 7: amend an older changeset
+  $ echo 'fix fix oops fix' > file2.c
+  $ hg commit -u bob -d '3 0' -m 'fix bug 17'
+  $ echo 'cleanup' >> file1.c
+  $ hg commit -u bob -d '4 0' -m 'cleanup'
+  $ echo 'new feature' >> file1.c
+  $ hg commit -u bob -d '5 0' -m 'feature 23'
+  $ hg --hidden shortlog -G -r 10::
+  @  13:dadcbba2d606  draft  feature 23
+  |
+  o  12:debd46bb29dc  draft  cleanup
+  |
+  o  11:3e1cb8f70c02  draft  fix bug 17
+  |
+  o  10:171c6a79a27b  draft  fix bug 64
+  |
+
+example 7: amend an older changeset (figures 6, 7)
+  $ hg update -q 11
+  $ echo 'fix fix fix fix' > file2.c
+  $ hg amend -u bob -d '6 0'
+  2 new unstable changesets
+  $ hg shortlog -r 'obsolete()'
+  11:3e1cb8f70c02  draft  fix bug 17
+  $ hg shortlog -r 'unstable()'
+  12:debd46bb29dc  draft  cleanup
+  13:dadcbba2d606  draft  feature 23
+  $ hg --hidden shortlog -G -r 10::
+  @  15:395cbeda3a06  draft  fix bug 17
+  |
+  | x  14:f7fab707e247  draft  temporary amend commit for 3e1cb8f70c02
+  | |
+  | | o  13:dadcbba2d606  draft  feature 23
+  | | |
+  | | o  12:debd46bb29dc  draft  cleanup
+  | |/
+  | x  11:3e1cb8f70c02  draft  fix bug 17
+  |/
+  o  10:171c6a79a27b  draft  fix bug 64
+  |
+  $ hg evolve -q --all
+  $ hg shortlog -G -r 10::
+  @  17:91b4b0f8b5c5  draft  feature 23
+  |
+  o  16:fe8858bd9bc2  draft  cleanup
+  |
+  o  15:395cbeda3a06  draft  fix bug 17
+  |
+  o  10:171c6a79a27b  draft  fix bug 64
+  |
+
+setup for example 8: prune an older changeset (figure 8)
+  $ echo 'useful' >> file1.c
+  $ hg commit -u carl -d '7 0' -m 'useful work'
+  $ echo 'debug' >> file2.c
+  $ hg commit -u carl -d '8 0' -m 'debug hack'
+  $ echo 'more useful' >> file1.c
+  $ hg commit -u carl -d '9 0' -m 'more work'
+  $ hg shortlog -G -r 17::
+  @  20:ea8fafca914b  draft  more work
+  |
+  o  19:b23d06b457a8  draft  debug hack
+  |
+  o  18:1f33e68b18b9  draft  useful work
+  |
+  o  17:91b4b0f8b5c5  draft  feature 23
+  |
+
+example 8: prune an older changeset (figures 8, 9)
+  $ hg prune 19
+  1 changesets pruned
+  1 new unstable changesets
+  $ hg --hidden shortlog -G -r 18::
+  @  20:ea8fafca914b  draft  more work
+  |
+  x  19:b23d06b457a8  draft  debug hack
+  |
+  o  18:1f33e68b18b9  draft  useful work
+  |
+  $ hg evolve -q --all
+  $ hg --hidden shortlog -G -r 18::
+  @  21:4393e5877437  draft  more work
+  |
+  | x  20:ea8fafca914b  draft  more work
+  | |
+  | x  19:b23d06b457a8  draft  debug hack
+  |/
+  o  18:1f33e68b18b9  draft  useful work
+  |
+
+example 9: uncommit files from an older changeset (discard changes)
+(figure 10)
+  $ echo 'this fixes bug 53' >> file1.c
+  $ echo 'debug hack' >> file2.c
+  $ hg commit -u dan -d '11 0' -m 'fix bug 53'
+  $ echo 'and this handles bug 67' >> file1.c
+  $ hg commit -u dan -d '12 0' -m 'fix bug 67'
+  $ hg update 22
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg shortlog -G -r 21::
+  o  23:4db2428c8ae3  draft  fix bug 67
+  |
+  @  22:f84357446753  draft  fix bug 53
+  |
+  o  21:4393e5877437  draft  more work
+  |
+  $ hg uncommit file2.c
+  1 new unstable changesets
+  $ hg status
+  M file2.c
+  $ hg revert file2.c
+  $ hg evolve --all
+  move:[23] fix bug 67
+  atop:[24] fix bug 53
+  $ hg --hidden shortlog -G -r 21::
+  @  25:0d972d6888e6  draft  fix bug 67
+  |
+  o  24:71bb83d674c5  draft  fix bug 53
+  |
+  | x  23:4db2428c8ae3  draft  fix bug 67
+  | |
+  | x  22:f84357446753  draft  fix bug 53
+  |/
+  o  21:4393e5877437  draft  more work
+  |
+  $ rm file2.c.orig
+
+example 10: uncommit files from an older changeset (keep changes)
+(figures 11, 12)
+  $ echo 'fix a bug' >> file1.c
+  $ echo 'useful but unrelated' >> file2.c
+  $ hg commit -u dan -d '11 0' -m 'fix a bug'
+  $ echo 'new feature' >> file1.c
+  $ hg commit -u dan -d '12 0' -m 'new feature'
+  $ hg update 26
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ hg --hidden shortlog -G -r 25::
+  o  27:fbb3c6d50427  draft  new feature
+  |
+  @  26:5b31a1239ab9  draft  fix a bug
+  |
+  o  25:0d972d6888e6  draft  fix bug 67
+  |
+  $ hg uncommit file2.c
+  1 new unstable changesets
+  $ hg status
+  M file2.c
+  $ hg commit -m 'useful tweak'
+  $ hg --hidden shortlog -G -r 25::
+  @  29:51e0d8c0a922  draft  useful tweak
+  |
+  o  28:2594e98553a9  draft  fix a bug
+  |
+  | o  27:fbb3c6d50427  draft  new feature
+  | |
+  | x  26:5b31a1239ab9  draft  fix a bug
+  |/
+  o  25:0d972d6888e6  draft  fix bug 67
+  |
+  $ hg evolve --all
+  move:[27] new feature
+  atop:[28] fix a bug
+  $ hg --hidden shortlog -G -r 25::
+  @  30:166c1c368ab6  draft  new feature
+  |
+  | o  29:51e0d8c0a922  draft  useful tweak
+  |/
+  o  28:2594e98553a9  draft  fix a bug
+  |
+  | x  27:fbb3c6d50427  draft  new feature
+  | |
+  | x  26:5b31a1239ab9  draft  fix a bug
+  |/
+  o  25:0d972d6888e6  draft  fix bug 67
+  |