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revert: special case 'hg revert --all'...
revert: special case 'hg revert --all' On large repos, hg revert --all can take over 13 seconds. This is mainly due to it walking the tree three times: once to find the list of files in the dirstate, once to find the list of files in the target, and once to compute the status from the dirstate to the target. This optimizes the hg revert --all case to only require the final status. This speeds it up to 1.3 seconds or so (with hgwatchman enabled). Further optimizations could be done for the -r NODE and pattern cases, but they are significantly more complex.
Mads Kiilerich - - Load All Authors

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revisions.txt
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Mercurial supports several ways to specify individual revisions.
A plain integer is treated as a revision number. Negative integers are
treated as sequential offsets from the tip, with -1 denoting the tip,
-2 denoting the revision prior to the tip, and so forth.
A 40-digit hexadecimal string is treated as a unique revision
identifier.
A hexadecimal string less than 40 characters long is treated as a
unique revision identifier and is referred to as a short-form
identifier. A short-form identifier is only valid if it is the prefix
of exactly one full-length identifier.
Any other string is treated as a bookmark, tag, or branch name. A
bookmark is a movable pointer to a revision. A tag is a permanent name
associated with a revision. A branch name denotes the tipmost open branch head
of that branch - or if they are all closed, the tipmost closed head of the
branch. Bookmark, tag, and branch names must not contain the ":" character.
The reserved name "tip" always identifies the most recent revision.
The reserved name "null" indicates the null revision. This is the
revision of an empty repository, and the parent of revision 0.
The reserved name "." indicates the working directory parent. If no
working directory is checked out, it is equivalent to null. If an
uncommitted merge is in progress, "." is the revision of the first
parent.