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.

#!/bin/sh

echo '% Show all commands except debug commands'
hg debugcomplete

echo
echo '% Show all commands that start with "a"'
hg debugcomplete a

echo
echo '% Do not show debug commands if there are other candidates'
hg debugcomplete d

echo
echo '% Show debug commands if there are no other candidates'
hg debugcomplete debug

echo
echo '% Do not show the alias of a debug command if there are other candidates'
echo '% (this should hide rawcommit)'
hg debugcomplete r

echo
echo '% Show the alias of a debug command if there are no other candidates'
hg debugcomplete rawc

echo
echo '% Show the global options'
hg debugcomplete --options | sort

echo
echo '% Show the options for the "serve" command'
hg debugcomplete --options serve | sort

echo
echo '% Show an error if we use --options with an ambiguous abbreviation'
hg debugcomplete --options s

exit 0