tags: unblock log-like template keywords and functions It checks if ctx will be used in template since loading ctx per revision could take extra 10-100msec in total depending on the number of tags.

formatter: provide hint of context keys required by template This allows us to create ctx objects only if necessary. I tried another idea which is to populate ctx from 'repo' and 'node' value on demand. It worked, but seemed unnecessarily complicated. So I chose a simpler one. The datafields argument is a space-separated string for consistency with fm.write() API.

templatefuncs: declare resource requirements for future use

templatefuncs: minimize resource requirements

merge with stable

merge: do not fill manifest of committed revision with pseudo node (issue5526) Since a75d24539aba "convert: fix convert dropping p2 contents during filemap merge", wctx is not always a committablectx because the convert extension passes in repo[n] as wctx. If wctx is a committed changeset, its manifest dict shouldn't be mutated reflecting to the working directory.

split: preserve phase of commit that is being split With this change, hg split will preserve the phase of the commit that is being split, ignoring the phases.new-commit setting. Previously, we would use whatever phases.new-commit was set to (unless our parent was secret, then we would be secret even if phases.new-commit=draft). Now, splitting a draft commit with phases.new-commit=secret does not cause the new commits to become secret, and splitting a secret commit with phases.new-commit=draft and a draft parent does not cause the new commits to become draft. Test cases and commit message taken from Kyle Lippincott's D2016 (thanks!). Differential Revision: https://phab.mercurial-scm.org/D3819

scmutil: make cleanupnodes optionally also fix the phase We have had multiple bugs where the phase wasn't correctly carried forward to a rewritten changeset (for example: phabricator, split, evolve, fix). Handling the phase update in cleanupnodes() makes it less likely to happen again, especially once we have made it fix the phase by default (perhaps in the next release cycle). This patch also updates all applicable callers so we get some testing of it. Note that rebase and histedit can't be fixed yet because they call cleanupnodes() only at the end and the phase may have been changed by the user when the rebase/histedit was interrupted (due to merge conflicts). I think we should make them write one commit at a time (as it already does), along with associated obsmarkers, bookmark moves, etc. When that's done, we can switch them over to cleanupnodes(). Differential Revision: https://phab.mercurial-scm.org/D3818

tests: add test of uncommit with default phase as secret We didn't seem to have any test checking that uncommitting a draft commit with phase.new-phase=secret preserved the draft phase. Differential Revision: https://phab.mercurial-scm.org/D3817

grep: add --diff flag Adds a diff flag, which works exactly same as all, in fact since --all searches diffs, there diff is a better name for it. The all flag is still here for backward compatibility reasons. Some major tests for all has been picked and added for diff. Differential Revision: https://phab.mercurial-scm.org/D3763

fix: include cleanupnodes() in transaction As pointed out by Yuya, we need a transaction to make sure the state before the call to cleanupnodes() is not observable. Differential Revision: https://phab.mercurial-scm.org/D3823

progress: enforce use of complete() on the helper class complete() is preferred over update(None), so let's enforce that. Differential Revision: https://phab.mercurial-scm.org/D3822