convert: add a mode where mercurial_sink skips empty revisions. The getchanges function of some converter_source classes can return some false positives. I.e. they sometimes claim that a file "foo" was changed in some revision, even though its contents are still the same. convert_svn is particularly bad, but I think this can also happen with convert_cvs and, at least in theory, with mercurial_source. For regular conversions this is not really a problem - as long as getfile returns the right contents, we'll get a converted revision with the right contents. But when we use --filemap, this could lead to superfluous revisions being converted. Instead of fixing every converter_source, I decided to change mercurial_sink to work around this problem. When --filemap is used, we're interested only in revisions that touch some specific files. If a revision doesn't change any of these files, then we're not interested in it (at least for revisions with a single parent; merges are special). For mercurial_sink, we abuse this property and rollback a commit if the manifest text hasn't changed. This avoids duplicating the logic from localrepo.filecommit to detect unchanged files.

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#!/usr/bin/env python

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import sys

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from mercurial import bdiff, mpatch

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def test1(a, b):

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    d = bdiff.bdiff(a, b)

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    c = a

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    if d:

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        c = mpatch.patches(a, [d])

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    if c != b:

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        print "***", `a`, `b`

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        print "bad:"

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        print `c`[:200]

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        print `d`

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def test(a, b):

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    print "***", `a`, `b`

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    test1(a, b)

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    test1(b, a)

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test("a\nc\n\n\n\n", "a\nb\n\n\n")

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test("a\nb\nc\n", "a\nc\n")

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test("", "")

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test("a\nb\nc", "a\nb\nc")

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test("a\nb\nc\nd\n", "a\nd\n")

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test("a\nb\nc\nd\n", "a\nc\ne\n")

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test("a\nb\nc\n", "a\nc\n")

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test("a\n", "c\na\nb\n")

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test("a\n", "")

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test("a\n", "b\nc\n")

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test("a\n", "c\na\n")

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test("", "adjfkjdjksdhfksj")

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test("", "ab")

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test("", "abc")

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test("a", "a")

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test("ab", "ab")

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test("abc", "abc")

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test("a\n", "a\n")

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test("a\nb", "a\nb")

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print "done"