hidden: change _domainancestors() to _revealancestors() This change makes the function actually reveal the ancestors by removing them from the hidden set. This prepares for further simplification. Note that the function will now only reveal contiguous chains of hidden revisions, but that's fine because we always pass it an immediate child of any revision that should be revealed (or the revision itself). This doesn't seem to have much impact on "perfvolatilesets". Before: ! obsolete ! wall 0.004672 comb 0.010000 user 0.010000 sys 0.000000 (best of 590) ! visible ! wall 0.008936 comb 0.010000 user 0.010000 sys 0.000000 (best of 322) After: ! obsolete ! wall 0.004903 comb 0.000000 user 0.000000 sys 0.000000 (best of 535) ! visible ! wall 0.008913 comb 0.010000 user 0.010000 sys 0.000000 (best of 300)

hidden: rename "revealedrevs" to "pinnedrevs" (API) E.g. tags and bookmarks can reveal revisions that would otherwise be hidden. A revision can also be revealed because one if its descendants is visible. Let's use the term "pinned" for the former case (bookmarks etc.).

hidden: drop obsolete comment about cacheability The cache was recently dropped, so I believe the comment is now obsolete.

cat: add formatter support This is an example showing how formatter can handle the --output option. git subrepo isn't supported for now.

cat: use with statement to close output file

cat: stop using makefileobj() Prepares for porting to the formatter API. We won't be able to utilize the abstraction provided by makefilename() because formatter must be instantiated per file.

formatter: add nullformatter This can be used as a placeholder variable.

formatter: add helper to create a formatter optionally backed by file To make things simple, openformatter() and maybereopen() have no support for a plain object API. Callers must use the "with" statement. Unlike cmdutil.makefileobj(), append mode ('ab') isn't supported by these functions. This is because JSON output can't be simply concatenated. Perhaps cmdutil.export() will have to build a {filename: [revs...]} map first and write revs per file.

formatter: add option to redirect output to file object Commands like 'export' have --output=OUTFILESPEC option, so we need a way to write formatter output optionally to a file.

merge with i18n