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=============================
Mutable History For Mercurial
=============================

This package supplies the ``evolve`` extension for Mercurial, which
provides several commands to mutate history and deal with the
resulting issues.

It also:

    - enables the "changeset obsolescence" feature of Mercurial
    - issues several warning messages when trouble appears in your repository

**This extension is experimental and not yet meant for production.**

You can enable it by adding the line below to the ``extensions``
section of your hgrc::

    evolve = PATH/TO/evolve-main/hgext3rd/evolve/

We recommend reading the documentation first. An online version is
available here:

    https://www.mercurial-scm.org/doc/evolution/

Or see the ``doc/`` directory for a local copy.

topic
=====

Topics are an experiment to see if maybe the workflow defined by git
branches and hg bookmarks is only partially what users want - perhaps
something that feels more like a traditional VCS branch is right, but
that it should "dissolve" upon being finished. This extension exists
to be a sandbox for that experimentation.

# install

Enable topics like any mercurial extension: download the source code to a
local directory, and add that directory to your `.hgrc`:

    [extensions]
    topics=PATH/TO/evolve-main/hgext3rd/topic/

# help

See 'hg help -e topic' for a generic help.
See 'hg help topics' and 'hg help stack' for help on specific commands.
See the 'tests/test-topic-tutorial.t' file for a quick tutorial.

Contribute
==========

Bugs are to be reported on the mercurial's bug tracker (component: evolution):
https://bz.mercurial-scm.org/buglist.cgi?component=evolution&query_format=advanced&resolution=---

Please 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 [e-mail] --flag evolve-ext --rev '<your patches>'

See also
https://mercurial-scm.org/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, you need a working copy of Mercurial,
say in $HGSRC:

    cd tests
    python $HGSRC/tests/run-tests.py

(evolve's stable and default branches correspond to Mercurial's stable
and default branches. So to test evolve from default, you need
Mercurial on default.)


Changelog
=========

6.0.0 --

  - drop compatibility for Mercurial < 3.8,
  - removed old (unpackaged) pushexperiment extension,
  - move all extensions in the official 'hgext3rd' namespace package,
  - add the "topic" experimental extensions.
  - officially ship 'evolve.serveronly' extensions. That extensions contains
    only the part related to exchange and is intended to be used by server.

    Using the extension will enable evolution, use 'experimental.evolution=!'
    to disable obsmarkers echange.  The old '__temporary__.advertiseobsolete'
    option is no longer supported.

5.6.1 -- 2017-02-28

 - fix a crash that sometime happened when evolving merges.

5.6.0 -- 2017-02-01

 - compatibility with Mercurial 4.1.
 - improvement of prune error message.
 - fold: require --from flag for folding revisions to working copy
 - fix crash when trying to fold an empty revision set (issue5453)
 - uncommit: preserve copy information of remaining files (issue5403)

5.5.0 -- 2016-10-30

 - The {obsolete} template now yield "obsolete" or "".
 - compatibility with Mercurial 4.0
 - Fix erroneous manifest computation when solving 'bumped' changeset.
 - split: avoid crash on empty commit (issue5191),
 - next: improve locking to avoid issue with working copy parent (issue5244)
 - prev: improve locking to avoid issue with working copy parent (issue5244)
 - evolve: fix abort suggestion to include '.' in 'hg update -C .'

5.4.1 -- 2016-08-01

 - compat with Mercurial 3.9

5.4.0 -- 2016-05-06

- Some collaboration with the topic experimental extensions,
  - hg evolve --all with consider all troubles in your current topic,
  - preserve 'topic' during evolve,
  - 'next' and 'prev' restrict themself to the current topic by default,
- remove the dangerous 'kill' alias for 'prune' (because 'hg kill -1' without
  the leading 'hg' will give you an hardtime)
- during 'hg evolve' skip unsupported merge instead of aborting
- various documentation fix and update
- hg summary now suggest 'hg evolve --continue when appropriate`
- compatibility with Mercurial 3.8 'hgext' namespace package.
- small improvement to the `hg split` instruction
- add a 'metaedit' command to rewrite changeset meta data.

5.3.0 -- 2016-02-11

- split: add a new command to split changesets,
- tests: drop our copy of 'run-tests.py' use core one instead,
- bookmark: do all bookmark movement within a transaction.
- evolve: compatibility with Mercurial 3.7
- evolve: support merge with a single obsolete parent (hg-3.7+ only)
- evolve: prevent added file to be marked as unknown if evolve fails (issue4966)
- evolve: stop relying on graftstate file for save evolve state
          (for `hg evolve --continue`)
- evolve: fix divergence resolution when it result in an empty commit
          (issue4950) (hg-3.5+ only)
- no longer lock the repository for `hg parents` (issue4895)
- updated help for the `evolve` command

5.2.1 -- 2015-11-02

- add compatibility with Mercurial 3.6
- prune: fixed possible issue with lock and bookmark
- next/prev: fixed possible issue with lock and bookmark
- add some progress data during changesets discovery
- take advantage of dirstate/transaction collaboration

5.2.0 -- 2015-06-25

- evolve: gain a --rev option to control what revisions to evolve (issue4391)
- evolve: revision are processed in the order they stack on destination
- evolve: properly skip unstable revision with non-evolved unstable parent
- evolve: gain --unstable --divergent --bumped flag to select the trouble
- evolve: issue more useful error message and hint when evolve has nothing to
          do as invocated.
- evolve: bare `hg evolve` commands now abort when multiple changesets could be
          a target.
- evolve: `hg evolve --all` only evolve changeset that will end up as
          descendant of the current working copy. The old behavior of `--all`
          in now in `--all --any`.
- evolve: add a 'experimental.evolutioncommands' for fine grained commands
          enabling
- next/prev: requires `--merge` to move with uncommitted changes
- next: significantly reword error messages
- next: add a --evolve flag to evolve aspiring children when on a head

5.1.5 -- 2015-06-23

- minor documentation cleanup
- support -i option for `hg amend` if commit supports it (3.4)
- fix the `debugrecordpruneparents` utility
- fix some possible crash during command abort (release nonexistent transaction)
- fix simple4server bug tracker URL
- compatibility with bookmark API change in future Mercurial 3.5
- prune no longer move the active bookmark for no reason (issue4559)
- evolve: stop reporting divergence base as missing when we actually have it
- significant performance improvement for all revsets.
- provide a hint of how to update to the successor of an obsolete working copy
  parent.

5.1.4 -- 2015-04-23

- significant documentation update
- fix issue4616: pulling with bundle2 would crash if common marker when
  discovered on non-served changesets.
- fix the debugobsrelsethashtree command

5.1.3 -- 2015-04-20

- discovery: fix misbehaving discovery across python version
- pull: properly install the bundle2 par generator
  (avoid sending all markers for each pull)
- commit: avoid potential deadlock (acquires wlock before lock)
- graft: avoid potential deadlock (acquires wlock before lock)

5.1.2 -- 2015-04-01

- evolve: prevent a crash in httpclient_pushobsmarkers() when pushing

5.1.1 -- 2015-03-05

- debugobsconvert: fix invalid markers during conversion
- discovery: cache some of the obs hash computation to improve performance (issue4518)
- revset: fix some crash with (issue4515)

5.1 -- 2015-01-30

- evolve: explicitly disable bookmark on evolve (issue4432)
- evolve: don't abort Mercurial on version mismatch
- compatibility with mercurial 3.3

5.0.2 -- 2014-12-14

- evolve: remove dependency to the rebase extension

5.0.1 -- 2014-11-25

- amend: fix --logfile argument
- evolve: preserve branch change when evolving
- evolve: fix potential crash while solving `bumped` changesets.
- uncommit: abort when rev specifies the current changeset
- evolve: various message improvement
- evolve: fix selection of changeset to evolve from the middle of a stack (issue4434)
- evolve: make next/prev only move bookmarks optionally
- evolve: tell user which "base of divergent changeset" is not found



5.0.0 -- 2014-10-22

- drop compat with Mercurial pre 3.2
- uncommit: add a --rev argument
- evolve: add a `working directory now at xxxxxxxxxx` message
- evolve: automatically translate obsolete hashes when evolving
- properly skip marker creating if patch apply cleanly
- prune: work around a massive slowdown from lazy revset
- grab: "fix" the grab alias on window

- fix an issue where prune performance were quadratic with the number of
  changesets pruned.
- pull: use discovery to pull less obsmarkers through bundle2


4.1.0 -- 2014-08-08

- amend: add -D/--current-date option
- amend: add -U/--current-user option
- evolve: add a --tool option
- evolve: add a --confirm 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)
- hide message about the obsolescence marker exchange behind a
  `experimental.verbose-obsolescence-exchange` variable (default to False).

4.0.1 -- 2014-08-08

- createmarkers() accept an iterable (for compat with other extension)

4.0.0 -- 2014-06-03

- require Mercurial version 3.0.1 or above
- some compatibility fixes with future 3.1.0
- deprecated `gup` and `gdown` in favor of prev and next
- record parent of pruned parent at prune time
- added a `debugobsstorestat` command to gather data on obsmarker content.
- added a `debugrecordpruneparents` command to upgrade existing prune marker
  with parent information. Please run it once per repo after upgrading.
- improvement to obsolescence marker exchange:
  - added progress when pushing obsmarkers
  - added multiple output during obsolescence markers exchange
  - only push markers relevant to pushed subset
  - add a new experimental way to exchange marker (when server support):

    - added progress when pulling obsmarkers
    - only pull markers relevant to pulled subset
    - avoid exchanging common markers in some case
    - use bundle2 as transport when available.

 - add a hook related to the new commands

3.3.2 -- 2014-05-14

- fix a bug where evolve were creating changeset with 2 parents on windows
  (fix issues #16, #35 and #42)
- adds a --obsolete flag to import (requires Mercurial 3.0)
- prune: update to successor rather than parent when pruning '.' with -s
- fold: add missing --message and --logfile option
- fold: add squash as an alias

3.3.1 -- 2014-04-23

- various language fix
- active bookmark now move when using prev/next (#37)
- fix some preservation of rename information on evolve (#33)
- abort when evolve tries to move a node on top of itself (will helps on the #35 front)
- fold: enable --date and --user options

3.3.0 -- 2014-03-04

- raise Mercurial's minimal requirement to 2.7
- drop `latercomer` and `conflicting` compatibility. Those old alias are
  deprecated for a long time now.
- add verbose hint about how to handle corner case by hand.
  This should help people until evolve is able to to it itself.
- removed the qsync extension. The only user I knew about (logilab) is not
  using it anymore. It not compatible with coming Mercurial version 2.9.
- add progress indicator for long evolve command
- report troubles creation from `hg import`

3.2.0 -- 2013-11-15

- conform to the Mercurial custom of lowercase messages
- added a small extension to experiment with obsolescence marker push
- amend: drop the deprecated note option
- amend: use core mechanism for amend (fix multiple bugs)
- parents command: add "working directory parent is obsolete" message
- evolve command: allow updating to the successor if the parent is
  obsolete
- gdown and gup commands: add next and previous alias, respectively
- make grab aliases compatible with Mercurial 2.8
- Tested with 2.6, 2.7 and 2.8

3.1.0 -- 2013-02-11

- amend: drop deprecated --change option for amend
- alias: add a grab alias to be used instead of graft -O
- touch: add a --duplicate option to *not* obsolete the old version
- touch: fix touching multiple revision at the same time
- evolve: add a --all option
- prune: various minor improvements
- prune: add option to prune a specific bookmark
- prune: add -u and -d option to control metadata

3.0.0 -- 2013-02-02

- compatibility with 2.5

2.2.0 --

- make evolve smarter at picking next troubled to solved without --any

2.1.0 -- 2012-12-03

- qsync fixes
- have qfold ask for commit message

2.0.0 -- 2012-10-26

- compat with mercurial 2.4

1.1.0 -- 2012-10-26

- fix troubles creation reporting from rebase
- rename latecomer to bumped
- renamed conflicting to divergent
- smarter divergent handling

1.0.2 -- 2012-09-19

- fix hg fold bug
- fix hg pull --rebase
- fix detection of conflict with external tools
- adapt to core movement (caches and --amend)

1.0.1 -- 2012-08-31

- documentation improvement
- fix a performance bug with hgweb

1.0 -- 2012-08-29

- Align with Mercurial version 2.3 (drop 2.2 support).
- stabilize handle killed parent
- stabilize handle late comer
- stabilize handle conflicting
- stabilize get a --continue switch
- merge and update ignore extinct changeset in most case.
- new "troubled()" revset
- summary now reports troubles changesets
- new touch command
- new fold command
- new basic olog alias

- rebase refuse to work on public changeset again
- rebase explicitly state that there is nothing to rebase because everything is
  extinct() when that happen.
- amend now cleanly abort when --change switch is misused


0.7 -- 2012-08-06

- hook: work around insanely huge value in obsolete pushkey call
- pushkey: properly handle abort during obsolete markers push
- amend: wrap the whole process in a single transaction.
- evolve: tweak and add EOL to kill warning
- obsolete: fix doc, rebase no longer aborts with --keep
- obsolete/evolve: fix grammar in prerequisite messages
- evolve: avoid duplication in graft wrapper
- evolve: graft --continue is optional, test

0.6 -- 2012-07-31

- obsolete: change warning output to match mercurial core on
- qsync: ignore nonexistent nodes
- make compat server both compatible with "dump" and "dump%i" version

0.5 -- 2012-07-16

- obsolete: Detect conflicting changeset!
- obsolete: adapt to core: marker are written in transaction now
- evolve: add the solve alias to obsolete
- doc: big update of terms and summary of the concept
- evolve: switch the official name for "kill" to prune


0.4.1 -- 2012-07-10

- [convert] properly exclude null successors from conversion
- Ignore buggy marker in newerversion


0.4.0 -- 2012-07-06

- obsolete: public changeset are no longer latecomer.
- obsolete: move to official binary format
- adapt for new mercurial
- obsolete: we are not compatible with 2.1 any more

0.3.0 -- 2012-06-27

- obsolete:  Add "latecomer" error detection (stabilize does not handle resolution yet)
- evolve:    Introduce a new `uncommit` command to remove change from a changeset
- rebase:    allow the use of --keep again
- commit:    --amend option create obsolete marker (but still strip)
- obsolete:  fewer marker are created when collapsing revision.
- revset:    add, successors(), allsuccessors(), precursors(), allprecursors(),
             latecomer() and hidden()
- evolve:    add `prune` alias to `kill`.
- stabilize: clearly state that stabilize does not handle conflict
- template:  add an {obsolete} keyword

0.2.0 -- 2012-06-20

- stabilize: improve choice of the next changeset to stabilize
- stabilize: improve resolution of several corner case
- rebase:    handle removing empty changesets
- rebase:    handle --collapse
- evolve:   add `obsolete` alias to `kill`
- evolve:   add `evolve` alias to `stabilize`