Mercurial 4.7 release

1. New Features

• 'hg graft' now has a '--stop' flag to stop interrupted graft.
• 'hg graft' now has an '--abort' flag which aborts the interrupted graft and rollbacks to state before the graft.

• 'hg graft' now has a '--no-commit' mode (issue5631)

• 'hg rebase' now supports '--confirm' and '--dry-run' flags.
• 'hg export' now has a '-B/--bookmark' option to select a bookmarked branch.
• The 'acl' extension now has support for bookmarks as well as branches.

• 'word-diff' option is now officially supported, and enabled by ui.tweakdefaults or can be enabled by setting diff.word-diff=True.

• The 'optimize-delta-parent-choice' is now enabled by default. It makes storing merge changesets more efficient by checking against which parent to make a delta.
• 'sparse-revlog' option is now available. This option allows for a better storage and compression of the manifest for very big repositories at a minimal cost on day-to-day commands.

2. Backwards Compatibility Changes

• The fileset expression may include untracked files by default. Use "tracked()" to explicitly filter out files not existing at the context revision.
• graft: reuse --user, --date, a --log values in 'hg graft --continue' (BC)
• revset: fix heads() order to always follow the input set (BC)
• revset: make id() an empty set for ambiguous nodeid (BC)
• revset: make id() to resolve node id prefix in unfiltered repo (BC)
• templater: consistently join() string-like object per character (BC)

3. Bug Fixes

• dispatch: fix exit code of unhandled exception recorded in blackbox log

• merge: mark file gets as not thread safe (issue5933)

• patch: don't separate \r and \n when colorizing diff output

• sparse-revlog: implement algorithm to write sparse delta chains (issue5480)

• obsolete: store user name and note in UTF-8 (issue5754) (BC)

• phases: remove excessive optimization from newheads() (issue5939)

• unlinkpath: make empty directory removal optional (issue5901) (issue5826)

• revlog: suggest other parent when a parent was refused for a delta (issue5481)

• templatefuncs: show hint if extdata source is evaluated to empty (issue5843)

• bookmarks: cache reverse mapping (issue5868)

• hgweb: strip trailing '/' in apppath before appending '/static/' (issue5943)

4. Performance improvements

• fncache: avoid loading the filename cache when not actually modifying it. This makes commits to existing files faster.

5. New experimental features

• grep: '--all-files -r "wdir()"' to search working-directory files, which is the default if tweakdefaults is on.

6. Other notable features

• annotate, files: automatically populate fields referenced from template
• bookmarks, files, status, tags: add support for log-like template keywords and functions
• grep: deprecates '--all' flag in favor of '--diff'
• serve: add --print-url option
• shelve: pick the most recent shelve if none specified for --patch/--stat
• status: add a config knob for setting default of --terse

7. API Changes

• repo[x] is now more strict about its input, see https://www.mercurial-scm.org/repo/hg/file/4.6/mercurial/context.py#l380

• "sshserver()" no longer sets stdin and stdout to binary mode.
• New context manager "ui.uninterruptable()" to mark portions of a command as potentially unsafe places to interrupt Mercurial with Control-C or similar.
• New ui.makeprogress() that makes it easier to update progress.
• changegroup: use progress helper in apply() (API)
• cmdutil: drop deprecated log helper methods (API)
• cmdutil: drop deprecated precursor of registrar.command (API)
• cmdutil: remove deprecated _revertprefetch code (API)
• context: drop support for looking up context by ambiguous changeid (API)
• context: explicitly take diffopts in 'context.diff' (API)
• context: make workingctx.matches() filter our removed files (API)
• demandimport: make module ignores a set (API)
• fileset: remove callexisting flag and mctx.existing() (API)
• fileset: restrict getfileset() to not return a computed set (API)
• merge: drop support for using updateresults as tuples (API)
• obsolete: explode if metadata contains invalid UTF-8 sequence (API)
• pycompat: export queue module instead of symbols in module (API)
• revlog: do inclusive descendant testing (API)
• revlog: replace descendant(b, a) by isdescendantrev(a, b) (API)
• scmutil: move repair.stripbmrevset as scmutil.bookmarkrevs (API)
• scmutil: remove deprecated revpairnodes method (API)
• shortest: don't keep checking for longer prefix if node doesn't exist (API)
• templatekw: drop deprecated showlist() and showdict() (API)
• templater: drop extension point of engine classes (API)
• update: use context manager for config override (API)
• util: drop deprecated forwarding to dateutil, procutil, and stringutil (API)

8. More notes to sort into the above

8.1. commands

8.2. core

• cmdutil: drop deprecated log helper methods (API)
• cmdutil: drop deprecated precursor of registrar.command (API)
• cmdutil: remove deprecated _revertprefetch code (API)
• context: also accept diff option directly
• context: drop support for looking up context by ambiguous changeid (API)
• context: explicitly take diffopts in 'context.diff' (API)
• context: make workingctx.matches() filter our removed files (API)
• context: no longer accept diff options as dictionnary
• dispatch: mask negative exit code recorded in blackbox log
• dispatch: unify handling of None returned by a command function

• filelog: don't crash on invalid copy metadata (issue5748)

• hook: add support for disabling the shell to native command translation
• hook: disable the shell to native command translation by default
• revlog: _segmentspan computes the byte span of a segment
• revlog: add function to slice chunk down to a given size
• revlog: delete isdescendantrev() in favor of isancestorrev()
• revlog: disallow setting uncompressed length to None
• revlog: do inclusive descendant testing (API)
• revlog: don't say "not found" on internal error
• revlog: early return in _slicechunk when density is already good
• revlog: early return in _slicechunk when span is already small enough
• revlog: efficient implementation of 'descendant'
• revlog: enforce chunk slicing down to a certain size
• revlog: handle error from node lookup
• revlog: handle errors from index_node() in nt_insert() and index_slice_del()
• revlog: introduce a tiny mock of a revlog class
• revlog: isgooddeltainfo takes the whole revinfo object
• revlog: make chainbase cache its result for the correct revision
• revlog: make getcandidaterevs more consistent about updating tested revs set

• revlog: make isdescendantrev(a, b) check if a < b

• revlog: make variable name 'd' more explicit in _isgooddeltainfo
• revlog: postprocess chunk to slice them down to a certain size
• revlog: replace descendant(b, a) by isdescendantrev(a, b) (API)
• revlog: reuse 'descendant' implemention in 'isancestor'
• revlog: use node tree (native code) for shortest() calculation
• revlog: use radix tree also for matching keys shorter than 4 hex digits
• revset: add partial support for ancestor(wdir())
• revset: fix heads() order to always follow the input set (BC)
• revset: make id() an empty set for ambiguous nodeid (BC)

• revset: pass in lookup function to matchany() (issue5879)

• revset: use resolvehexnodeidprefix() in id() predicate (BC)
• templater: make date wrapper support dot/map operations
• transaction-summary: show phase changes statistics in pull/unbundle
• worker: support more return types in posix worker

8.3. extensions

• convert: don't pass --no-files to "darcs show repo" command
• histedit: add history-editing-backup config option
• shelve: use more accurate description in conflict marker

8.4. hgweb

• hgweb: propagate http headers from ErrorResponse for web interface commands

8.5. unsorted

• aggressivemergedeltas: enabled the option by default
• filemerge: support specifying a python function to custom merge-tools
• fuzzutil: make it possible to use absl when C++17 isn't supported
• mpatch: introduce a safeadd() helper to work around UB int overflow
• mpatch: introduce a safesub() helper as well
• phase: clarify the message about movement on command changeset
• remotenames: enable the storage config option if extension is enabled
• sparse-revlog: new requirement enabled with format.sparse-revlog

• zstandard: pull in bug fixes from upstream 0.9.1 release (issue5884)