Teach diff to imply --find-copies-harder upon -C -C

Earlier, a second "-C" on the command line had no effect.
But "--find-copies-harder" is so long to type, let's make doubled -C
enable that option.  It is in line with how "git blame" handles such
doubled options to mean "work harder".

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2007-06-11 21:12:19 +01:00 коммит произвёл Junio C Hamano
Родитель d52fd42acd
Коммит ca6c097089
2 изменённых файлов: 6 добавлений и 3 удалений

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@ -86,7 +86,7 @@
Detect renames.
-C::
Detect copies as well as renames.
Detect copies as well as renames. See also `--find-copies-harder`.
--diff-filter=[ACDMRTUXB*]::
Select only files that are Added (`A`), Copied (`C`),
@ -100,12 +100,13 @@
that matches other criteria, nothing is selected.
--find-copies-harder::
For performance reasons, by default, -C option finds copies only
For performance reasons, by default, `-C` option finds copies only
if the original file of the copy was modified in the same
changeset. This flag makes the command
inspect unmodified files as candidates for the source of
copy. This is a very expensive operation for large
projects, so use it with caution.
projects, so use it with caution. Giving more than one
`-C` option has the same effect.
-l<num>::
-M and -C options require O(n^2) processing time where n

2
diff.c
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@ -2201,6 +2201,8 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
options->detect_rename = DIFF_DETECT_RENAME;
}
else if (!prefixcmp(arg, "-C")) {
if (options->detect_rename == DIFF_DETECT_COPY)
options->find_copies_harder = 1;
if ((options->rename_score =
diff_scoreopt_parse(arg)) == -1)
return -1;