log: allow matchfn to be non-null even if both --patch/--stat are off
This makes the next patch slightly simpler.
log: replace "not pats" with matcher attribute for consistency
We use match.always() in _makelogrevset(). match.always() is identical to
"not pats" here since scmutil.matchandpats() empties pats in that case.
log: follow file history across copies even with -rREV (BC) (
issue4959)
Still it falls back to changelog path if glob patterns or missing paths
are specified. This will be changed later.
.. bc::
``log --follow -rREV FILE..`` now follows file history across copies and
renames.
log: resolve --follow thoroughly in getlogrevs()
This makes sense because --follow isn't really an option to filter revisions,
but an option to extend revisions to be filtered.
_fileancestors() is a minimal copy of revset._follow(). They are slightly
different in that which revision the matcher sees. _fileancestors() also
uses ctx.walk() instead of ctx.manifest().walk() to show a better warning
on bad match, which will be tested later.
log: extract function that processes log file patterns
We'll need a matcher to compute revs followed from the given patterns.
log: resolve --follow with -rREV in cmdutil.getlogrevs()
This also fixes alias expansion. Before, reverse() could be overridden by user
alias.
This isn't processed at _logrevs() as we'll need starting revisions to parse
file patterns. See the subsequent patches for details.