filemerge: support passing labels to external merge tools This adds $labellocal, $labelother, and $labelbase to the replacement set for merge-tools.<tool>.args config variables, and to the environment as HG_MY_LABEL, HG_OTHER_LABEL, and HG_BASE_LABEL, respectively. We also add merge-tools.<tool>.mergemarkers and merge-tools.<tool>.mergemarkertemplate config variables as counterparts of the variables available in [ui]. We are intentionally *not* respecting ui.mergemarkers when calling out to external merge programs; too often the default template will be too wide to display comfortably in most GUIs. Differential Revision: https://phab.mercurial-scm.org/D2011

bookmarks: drop deprecated methods (API) The ProgrammingError prevents accidental usage of the dict base class methods. .. api:: The following deprecated methods have been removed from bookmarks: __setitem__(), __delitem__(), update(), and recordchange(). Use bookmarks.applychanges() instead.

archive: rewrite default metadata template as a multi-line bytes literal This fixes test-directaccess.t on Python 3.

py3: drop b'' from repr() of smartset cmdutil._maybebytestr() is moved to pycompat.

py3: always drop b'' prefix from repr() of bytestr Perhaps this is what we wanted for py2-3 compatibility.

py3: format revision number as '%d' in debugrevspec Now "hg debugrevspec" works on Python 3.

py3: build repr() of smartset as bytes then convert to str This isn't pretty, but we have no way to teach Python 3 that our __repr__() would like to return a byte string.

py3: factor out helpers to apply string conversion recursively

py3: replace "if ispy3" by pycompat.sysbytes() or util.forcebytestr()

py3: replace "if ispy3" by pycompat.bytestr()

py3: replace "if ispy3" by encoding.strtolocal()

localrepo: drop the deprecated walk() method (API) .. api:: The deprecated localrepo.walk() has been removed, and replaced by repo[node].walk().

dirstate: drop deprecated methods (API) .. api:: beginparentchange() and endparentchange() have been replaced by the parentchange context manager.

templatekw: drop the deprecated '{troubles}' keyword

obsutil: drop deprecated methods (API) .. api:: The following deprecated methods have been removed from obsutil: marker.precnode() and allprecursors(). Use marker.prednode() and allpredecessors() instead.

revset: drop deprecated evolution predicates

obsolete: drop deprecated methods (API) .. api:: The following deprecated methods have been removed from obsolete, with replacements: - _addprecursors() -> _addpredecessors() - obsstore.precursors -> obsstore.predecessors - allprecursors() -> obsutil.allprecursors() - allsuccessors() -> obsutil.allsuccessors() - marker() -> obsutil.marker - getmarkers() -> obsutil.getmarkers() - exclusivemarkers() -> obsutil.exclusivemarkers() - foreground() -> obsutil.foreground() - successorssets() -> obsutil.successorsset() - unstable() -> orphan() - bumped() -> phasedivergent() - divergent() -> contentdivergent()

context: drop deprecated methods (API) .. api:: The following deprecated methods have been removed from context, with replacements: - unstable() -> orphan() - bumped() -> phasedivergent() - divergent() -> contentdivergent() - troubled() -> isunstable() - troubles() -> instabilities()

ui: improve performance for multi-component writes It is more efficient to pass down one large string to the output streams than many small ones. For a ``hg diff`` test case, it improves time from 2m26s to 2m8s. Differential Revision: https://phab.mercurial-scm.org/D1939

cmdutil: drop aliases for logcmdutil functions (API) .. api:: Log-related utility functions has been renamed as follows: - cmdutil.loglimit -> logcmdutil.getlimit - cmdutil.diffordiffstat -> logcmdutil.diffordiffstat - cmdutil._changesetlabels -> logcmdutil.changesetlabels - cmdutil.changeset_printer -> logcmdutil.changesetprinter - cmdutil.jsonchangeset = logcmdutil.jsonchangeset - cmdutil.changeset_templater -> logcmdutil.changesettemplater - cmdutil.logtemplatespec -> logcmdutil.templatespec - cmdutil.makelogtemplater -> logcmdutil.maketemplater - cmdutil.show_changeset -> logcmdutil.changesetdisplayer - cmdutil.getlogrevs -> logcmdutil.getrevs - cmdutil.getloglinerangerevs -> logcmdutil.getlinerangerevs - cmdutil.displaygraph -> logcmdutil.displaygraph - cmdutil.graphlog -> logcmdutil.graphlog - cmdutil.checkunsupportedgraphflags -> logcmdutil.checkunsupportedgraphflags - cmdutil.graphrevs -> logcmdutil.graphrevs - cmdutil._makenofollowlogfilematcher -> logcmdutil._makenofollowfilematcher

logcmdutil: drop redundant "log" from function names (API) A few exceptions: - s/loglimit/getlimit/ to avoid name conflict - s/_logrevs/_initialrevs/ to clarify its functionality

logcmdutil: rename classes and functions to conform to our coding style (API) show_changeset is renamed to changesetdisplayer as its return value is called a displayer.

cmdutil: split functions of log-like commands to new module (API) cmdutil.py is painfully big and makes Emacs slow. Let's split log-related functions. % wc -l mercurial/cmdutil.py 4027 mercurial/cmdutil.py % wc -l mercurial/cmdutil.py mercurial/logcmdutil.py 3141 mercurial/cmdutil.py 933 mercurial/logcmdutil.py 4074 total

httppeer: remove support for connecting to <0.9.1 servers (BC) Previously, HTTP wire protocol clients would attempt a "capabilities" wire protocol command. If that failed, they would fall back to issuing a "between" command. The "capabilities" command was added in Mercurial 0.9.1 (released July 2006). The "between" command has been present for as long as the wire protocol has existed. So if the "between" command failed, it was safe to assume that the remote could not speak any version of the Mercurial wire protocol. The "between" fallback was added in 395a84f78736 in 2011. Before that changeset, Mercurial would *always* issue the "between" command and would issue "capabilities" if capabilities were requested. At that time, many connections would issue "capabilities" eventually, so it was decided to issue "capabilities" by default and fall back to "between" if that failed. This saved a round trip when connecting to modern servers while still preserving compatibility with legacy servers. Fast forward ~7 years. Mercurial servers supporting "capabilities" have been around for over a decade. If modern clients are connecting to <0.9.1 servers, they are getting a bad experience. They may even be getting bad data (an old server is vulnerable to numerous security issues and could have been p0wned, leading to a Mercurial repository serving backdoors or other badness). In addition, the fallback can harm experience for modern servers. If a client experiences an intermittent HTTP request failure (due to bad network, etc) and falls back to a "between" that works, it would assume an empty capability set and would attempt to communicate with the repository using a very ancient wire protocol. Auditing HTTP logs for hg.mozilla.org, I did find a handful of requests for the null range of the "between" command. However, requests can be days apart. And when I do see requests, they come in batches. Those batches seem to correlate to spikes of HTTP 500 or other server/network events. So I think these requests are fallbacks from failed "capabilities" requests and not from old clients. If you need even more evidence to discontinue support, apparently we have no test coverage for communicating with servers not supporting "capabilities." I know this because all tests pass with the "between" fallback removed. Finally, server-side support for <0.9.1 pushing (the "addchangegroup" wire protocol command along with locking-related commands) was dropped from the HTTP client in fda0867cfe03 in 2017 and the SSH client in 9f6e0e7ef828 in 2015. I think this all adds up to enough justification for removing client support for communicating with servers not supporting "capabilities." So this commit removes that fallback. Differential Revision: https://phab.mercurial-scm.org/D2001