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# Mercurial extension to make it easy to refer to the parent of a revision
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#
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# Copyright (C) 2007 Alexis S. L. Carvalho <alexis@cecm.usp.br>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2, incorporated herein by reference.
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'''interpret suffixes to refer to ancestor revisions
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This extension allows you to use git-style suffixes to refer to the
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ancestors of a specific revision.
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For example, if you can refer to a revision as "foo", then::
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foo^N = Nth parent of foo
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foo^0 = foo
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foo^1 = first parent of foo
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foo^2 = second parent of foo
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foo^ = foo^1
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foo~N = Nth first grandparent of foo
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foo~0 = foo
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foo~1 = foo^1 = foo^ = first parent of foo
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foo~2 = foo^1^1 = foo^^ = first parent of first parent of foo
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'''
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from mercurial import error
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def reposetup(ui, repo):
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if not repo.local():
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return
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class parentrevspecrepo(repo.__class__):
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def lookup(self, key):
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try:
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_super = super(parentrevspecrepo, self)
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return _super.lookup(key)
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except error.RepoError:
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pass
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circ = key.find('^')
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tilde = key.find('~')
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if circ < 0 and tilde < 0:
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raise
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elif circ >= 0 and tilde >= 0:
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end = min(circ, tilde)
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else:
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end = max(circ, tilde)
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cl = self.changelog
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base = key[:end]
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try:
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node = _super.lookup(base)
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except error.RepoError:
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# eek - reraise the first error
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return _super.lookup(key)
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rev = cl.rev(node)
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suffix = key[end:]
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i = 0
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while i < len(suffix):
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# foo^N => Nth parent of foo
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# foo^0 == foo
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# foo^1 == foo^ == 1st parent of foo
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# foo^2 == 2nd parent of foo
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if suffix[i] == '^':
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j = i + 1
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p = cl.parentrevs(rev)
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if j < len(suffix) and suffix[j].isdigit():
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j += 1
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n = int(suffix[i+1:j])
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if n > 2 or n == 2 and p[1] == -1:
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raise
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else:
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n = 1
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if n:
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rev = p[n - 1]
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i = j
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# foo~N => Nth first grandparent of foo
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# foo~0 = foo
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# foo~1 = foo^1 == foo^ == 1st parent of foo
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# foo~2 = foo^1^1 == foo^^ == 1st parent of 1st parent of foo
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elif suffix[i] == '~':
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j = i + 1
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while j < len(suffix) and suffix[j].isdigit():
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j += 1
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if j == i + 1:
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raise
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n = int(suffix[i+1:j])
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for k in xrange(n):
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rev = cl.parentrevs(rev)[0]
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i = j
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else:
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raise
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return cl.node(rev)
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repo.__class__ = parentrevspecrepo
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