Diff: -l<num> to limit rename/copy detection.

When many paths are modified, rename detection takes a lot of time.
The new option -l<num> can be used to disable rename detection when
more than <num> paths are possibly created as renames.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 15 insertions, 15 deletions

diff --git a/diff.h b/diff.h
index 5800f15a3..2e3287090 100644
--- a/diff.h
+++ b/diff.h
@@ -21,6 +21,7 @@ struct diff_options {
 	int pickaxe_opts;
 	int rename_score;
 	int reverse_diff;
+	int rename_limit;
 	int setup;
 };
 
@@ -61,23 +62,22 @@ extern void diffcore_std_no_resolve(struct diff_options *);
 
 #define COMMON_DIFF_OPTIONS_HELP \
 "\ncommon diff options:\n" \
-"  -r		diff recursively (only meaningful in diff-tree)\n" \
-"  -z		output diff-raw with lines terminated with NUL.\n" \
-"  -p		output patch format.\n" \
-"  -u		synonym for -p.\n" \
-"  --name-only	show only names of changed files.\n" \
-"  --name-only-z\n" \
-"		same as --name-only but terminate lines with NUL.\n" \
-"  -R		swap input file pairs.\n" \
-"  -B		detect complete rewrites.\n" \
-"  -M		detect renames.\n" \
-"  -C		detect copies.\n" \
+"  -r            diff recursively (only meaningful in diff-tree)\n" \
+"  -z            output diff-raw with lines terminated with NUL.\n" \
+"  -p            output patch format.\n" \
+"  -u            synonym for -p.\n" \
+"  --name-only   show only names of changed files.\n" \
+"  -R            swap input file pairs.\n" \
+"  -B            detect complete rewrites.\n" \
+"  -M            detect renames.\n" \
+"  -C            detect copies.\n" \
 "  --find-copies-harder\n" \
-"		try unchanged files as candidate for copy detection.\n" \
-"  -O<file>	reorder diffs according to the <file>.\n" \
-"  -S<string>	find filepair whose only one side contains the string.\n" \
+"                try unchanged files as candidate for copy detection.\n" \
+"  -l<n>         limit rename attempts up to <n> paths.\n" \
+"  -O<file>      reorder diffs according to the <file>.\n" \
+"  -S<string>    find filepair whose only one side contains the string.\n" \
 "  --pickaxe-all\n" \
-"		show all files diff when -S is used and hit is found.\n"
+"                show all files diff when -S is used and hit is found.\n"
 
 extern int diff_queue_is_empty(void);