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-rw-r--r--diff-tree.c78
1 files changed, 76 insertions, 2 deletions
diff --git a/diff-tree.c b/diff-tree.c
index 0f37092..618fdb6 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -3,6 +3,11 @@
static int recursive = 0;
static int line_termination = '\n';
+// What paths are we interested in?
+static int nr_paths = 0;
+static char **paths = NULL;
+static int *pathlens = NULL;
+
static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base);
static void update_tree_entry(void **bufp, unsigned long *sizep)
@@ -131,9 +136,63 @@ static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, uns
return 0;
}
+static int interesting(void *tree, unsigned long size, const char *base)
+{
+ const char *path;
+ unsigned mode;
+ int i;
+ int baselen, pathlen;
+
+ if (!nr_paths)
+ return 1;
+
+ (void)extract(tree, size, &path, &mode);
+
+ pathlen = strlen(path);
+ baselen = strlen(base);
+
+ for (i=0; i < nr_paths; i++) {
+ const char *match = paths[i];
+ int matchlen = pathlens[i];
+
+ if (baselen >= matchlen) {
+ /* If it doesn't match, move along... */
+ if (strncmp(base, match, matchlen))
+ continue;
+
+ /* The base is a subdirectory of a path which was specified. */
+ return 1;
+ }
+
+ /* Does the base match? */
+ if (strncmp(base, match, baselen))
+ continue;
+
+ match += baselen;
+ matchlen -= baselen;
+
+ if (pathlen > matchlen)
+ continue;
+
+ if (strncmp(path, match, pathlen))
+ continue;
+
+ return 1;
+ }
+ return 0; /* No matches */
+}
+
static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *base)
{
while (size1 | size2) {
+ if (nr_paths && size1 && !interesting(tree1, size1, base)) {
+ update_tree_entry(&tree1, &size1);
+ continue;
+ }
+ if (nr_paths && size2 && !interesting(tree2, size2, base)) {
+ update_tree_entry(&tree2, &size2);
+ continue;
+ }
if (!size1) {
show_file("+", tree2, size2, base);
update_tree_entry(&tree2, &size2);
@@ -184,8 +243,12 @@ int main(int argc, char **argv)
{
unsigned char old[20], new[20];
- while (argc > 3) {
+ for (;;) {
char *arg = argv[1];
+
+ if (!arg || *arg != '-')
+ break;
+
argv++;
argc--;
if (!strcmp(arg, "-r")) {
@@ -199,7 +262,18 @@ int main(int argc, char **argv)
usage(diff_tree_usage);
}
- if (argc != 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new))
+ if (argc < 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new))
usage(diff_tree_usage);
+
+ if (argc > 3) {
+ int i;
+
+ paths = &argv[3];
+ nr_paths = argc - 3;
+ pathlens = malloc(nr_paths * sizeof(int));
+ for (i=0; i<nr_paths; i++)
+ pathlens[i] = strlen(paths[i]);
+ }
+
return diff_tree_sha1(old, new, "");
}