[PATCH] Introducing software archaeologist's tool "pickaxe".
This steals the "pickaxe" feature from JIT and make it available
to the bare Plumbing layer. From the command line, the user
gives a string he is intersted in.
Using the diff-core infrastructure previously introduced, it
filters the differences to limit the output only to the diffs
between <src> and <dst> where the string appears only in one but
not in the other. For example:
$ ./git-rev-list HEAD | ./git-diff-tree -Sdiff-tree-helper --stdin -M
would show the diffs that touch the string "diff-tree-helper".
In real software-archaeologist application, you would typically
look for a few to several lines of code and see where that code
came from.
The "pickaxe" module runs after "rename/copy detection" module,
so it even crosses the file rename boundary, as the above
example demonstrates.
Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/diff-files.c b/diff-files.c
index d020254..d3b80a0 100644
--- a/diff-files.c
+++ b/diff-files.c
@@ -7,13 +7,14 @@
#include "diff.h"
static const char *diff_files_usage =
-"git-diff-files [-p] [-q] [-r] [-z] [-M] [-C] [-R] [paths...]";
+"git-diff-files [-p] [-q] [-r] [-z] [-M] [-C] [-R] [-S<string>] [paths...]";
static int generate_patch = 0;
static int line_termination = '\n';
static int detect_rename = 0;
static int reverse_diff = 0;
static int diff_score_opt = 0;
+static char *pickaxe = 0;
static int silent = 0;
static int matches_pathspec(struct cache_entry *ce, char **spec, int cnt)
@@ -67,6 +68,8 @@
line_termination = 0;
else if (!strcmp(argv[1], "-R"))
reverse_diff = 1;
+ else if (!strcmp(argv[1], "-S"))
+ pickaxe = argv[1] + 2;
else if (!strncmp(argv[1], "-M", 2)) {
diff_score_opt = diff_scoreopt_parse(argv[1]);
detect_rename = generate_patch = 1;
@@ -89,8 +92,8 @@
exit(1);
}
- diff_setup(detect_rename, diff_score_opt, reverse_diff,
- (generate_patch ? -1 : line_termination),
+ diff_setup(detect_rename, diff_score_opt, pickaxe,
+ reverse_diff, (generate_patch ? -1 : line_termination),
NULL, 0);
for (i = 0; i < entries; i++) {
