match: optimize visitdir() for patterns matching only root directory Because _rootsanddirs() returns a list of directories to visit recursively and a list of directories to visit non-recursively. For patterns such as 'rootfilesin:foo/bar', we clearly need to visit the directory foo/bar, but we also need to visit its parents. The method therefore uses util.dirs() to find the parent directories of 'foo/bar'. That method does not include the root directory, but since we obviously need to visit the root directory, we always added '.' to the set of directories to visit non-recursively. The visitdir() method had special handling to consider set(['.']) to mean that no includes had been specified and would thus visit all directories. However, when the pattern is 'rootfilesin:.', set(['.']) is actually the real set of directories to visit and the special handling of that set meant that all directories got visited instead of just the root directory. The fix is simple: add '.' to the set of parent directories in _rootsanddirs() and stop treating set(['.']) specially. This makes hg files -r . -I rootfilesin:. in a treemanifest version of the Firefox repo go from 1.5s to 0.26s on warm disk (and a *much* bigger improvement on cold disk). Note that the -I is necessary for no good reason. We just haven't optimized visitdir() for regular (non-include, non-exclude) patterns yet.

     1

Our full contribution guidelines are in our wiki, please see:

     2

     3

https://www.mercurial-scm.org/wiki/ContributingChanges

     4

     5

If you just want a checklist to follow, you can go straight to

     6

     7

https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist

     8

     9

If you can't run the entire testsuite for some reason (it can be

    10

difficult on Windows), please at least run `contrib/check-code.py` on

    11

any files you've modified and run `python contrib/check-commit` on any

    12

commits you've made (for example, `python contrib/check-commit

    13

273ce12ad8f1` will report some style violations on a very old commit).