diff: make more cases implicit --no-index
When specifying an absolute path, or a relative path pointing outside
the working tree, do not fail, but roll your own diffopt parsing,
and execute a --no-index diff.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/diff-lib.c b/diff-lib.c
index 2e91619..75ff0dd 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -200,6 +200,60 @@
return 0;
}
+static int is_outside_repo(const char *path, int nongit, const char *prefix)
+{
+ int i;
+ if (nongit || !strcmp(path, "-") || path[0] == '/')
+ return 1;
+ if (prefixcmp(path, "../"))
+ return 0;
+ if (!prefix)
+ return 1;
+ for (i = strlen(prefix); !prefixcmp(path, "../"); ) {
+ while (i > 0 && prefix[i - 1] != '/')
+ i--;
+ if (--i < 0)
+ return 1;
+ path += 3;
+ }
+ return 0;
+}
+
+int setup_diff_no_index(struct rev_info *revs,
+ int argc, const char ** argv, int nongit, const char *prefix)
+{
+ int i;
+ for (i = 1; i < argc; i++)
+ if (argv[i][0] != '-')
+ break;
+ else if (!strcmp(argv[i], "--")) {
+ i++;
+ break;
+ } else if (i < argc - 3 && !strcmp(argv[i], "--no-index")) {
+ i = argc - 3;
+ break;
+ }
+ if (argc != i + 2 || (!is_outside_repo(argv[i + 1], nongit, prefix) &&
+ !is_outside_repo(argv[i], nongit, prefix)))
+ return -1;
+
+ diff_setup(&revs->diffopt);
+ for (i = 1; i < argc - 2; )
+ if (!strcmp(argv[i], "--no-index"))
+ i++;
+ else {
+ int j = diff_opt_parse(&revs->diffopt,
+ argv + i, argc - i);
+ if (!j)
+ die("invalid diff option/value: %s", argv[i]);
+ i += j;
+ }
+ revs->diffopt.paths = argv + argc - 2;
+ revs->diffopt.nr_paths = 2;
+ revs->max_count = -2;
+ return 0;
+}
+
int run_diff_files_cmd(struct rev_info *revs, int argc, const char **argv)
{
int silent_on_removed;
