1 from mercurial import revset

     2 

     3 def topicset(repo, subset, x):

     4     """`topic([topic])`

     5     Specified topic or all changes with any topic specified.

     6 

     7     If `topic` starts with `re:` the remainder of the name is treated

     8     as a regular expression.

     9 

    10     TODO: make `topic(revset)` work the same as `branch(revset)`.

    11     """

    12     args = revset.getargs(x, 0, 1, 'topic takes one or no arguments')

    13     if args:

    14         # match a specific topic

    15         topic = revset.getstring(args[0], 'topic() argument must be a string')

    16         _kind, _pattern, matcher = revset._stringmatcher(topic)

    17     else:

    18         matcher = lambda t: bool(t)

    19     drafts = subset.filter(lambda r: repo[r].mutable())

    20     return drafts.filter(lambda r: matcher(repo[r].extra().get('topic', '')))

    21 

    22 def modsetup():

    23     revset.symbols.update({'topic': topicset})