diff-tree: support list if input trees on stdin
This means that you can do
git-rev-list HEAD --max-count=10 | git-diff-tree --stdin update-cache.c
to see which (if any) of the last ten commits changed update-cache.c.
Use the "-m" flag to see merges too. Normally they are suppressed.
diff --git a/diff-tree.c b/diff-tree.c
index c689c61..9e15b70 100644
--- a/diff-tree.c
+++ b/diff-tree.c
@@ -1,7 +1,10 @@
+#include <ctype.h>
#include "cache.h"
#include "diff.h"
+static int ignore_merges = 1;
static int recursive = 0;
+static int read_stdin = 0;
static int line_termination = '\n';
static int generate_patch = 0;
@@ -250,20 +253,67 @@
return retval;
}
+static int diff_tree_stdin(char *line)
+{
+ int len = strlen(line);
+ unsigned char commit[20], parent[20];
+ unsigned long size, offset;
+ char *buf;
+
+ if (!len || line[len-1] != '\n')
+ return -1;
+ line[len-1] = 0;
+ if (get_sha1_hex(line, commit))
+ return -1;
+ if (isspace(line[40]) && !get_sha1_hex(line+41, parent)) {
+ line[40] = ' ';
+ line[81] = 0;
+ printf("%s:\n", line);
+ return diff_tree_sha1(parent, commit, "");
+ }
+ buf = read_object_with_reference(commit, "commit", &size, NULL);
+ if (!buf)
+ return -1;
+
+ /* More than one parent? */
+ if (ignore_merges) {
+ if (!memcmp(buf + 46 + 48, "parent ", 7))
+ return 0;
+ }
+
+ line[40] = 0;
+ offset = 46;
+ while (offset + 48 < size && !memcmp(buf + offset, "parent ", 7)) {
+ if (get_sha1_hex(buf + offset + 7, parent))
+ return -1;
+ printf("%s %s:\n", line, sha1_to_hex(parent));
+ diff_tree_sha1(parent, commit, "");
+ offset += 48;
+ }
+ return -1;
+}
+
static char *diff_tree_usage = "diff-tree [-p] [-r] [-z] <tree sha1> <tree sha1>";
int main(int argc, char **argv)
{
+ char line[1000];
unsigned char old[20], new[20];
for (;;) {
- char *arg = argv[1];
-
- if (!arg || *arg != '-')
- break;
+ char *arg;
argv++;
argc--;
+ arg = *argv;
+ if (!arg || *arg != '-')
+ break;
+
+ if (!strcmp(arg, "-")) {
+ argv++;
+ argc--;
+ break;
+ }
if (!strcmp(arg, "-r")) {
recursive = 1;
continue;
@@ -276,21 +326,39 @@
line_termination = '\0';
continue;
}
+ if (!strcmp(arg, "-m")) {
+ ignore_merges = 0;
+ continue;
+ }
+ if (!strcmp(arg, "--stdin")) {
+ read_stdin = 1;
+ continue;
+ }
usage(diff_tree_usage);
}
- if (argc < 3 || get_sha1(argv[1], old) || get_sha1(argv[2], new))
- usage(diff_tree_usage);
+ if (!read_stdin) {
+ if (argc < 2 || get_sha1(argv[0], old) || get_sha1(argv[1], new))
+ usage(diff_tree_usage);
+ argv += 2;
+ argc -= 2;
+ }
- if (argc > 3) {
+ if (argc > 0) {
int i;
- paths = &argv[3];
- nr_paths = argc - 3;
+ paths = argv;
+ nr_paths = argc;
pathlens = xmalloc(nr_paths * sizeof(int));
for (i=0; i<nr_paths; i++)
pathlens[i] = strlen(paths[i]);
}
- return diff_tree_sha1(old, new, "");
+ if (!read_stdin)
+ return diff_tree_sha1(old, new, "");
+
+ while (fgets(line, sizeof(line), stdin))
+ diff_tree_stdin(line);
+
+ return 0;
}
