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-rw-r--r--builtin/patch-id.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/builtin/patch-id.c b/builtin/patch-id.c
new file mode 100644
index 0000000..f821eb3
--- /dev/null
+++ b/builtin/patch-id.c
@@ -0,0 +1,155 @@
+#include "builtin.h"
+
+static void flush_current_id(int patchlen, unsigned char *id, git_SHA_CTX *c)
+{
+ unsigned char result[20];
+ char name[50];
+
+ if (!patchlen)
+ return;
+
+ git_SHA1_Final(result, c);
+ memcpy(name, sha1_to_hex(id), 41);
+ printf("%s %s\n", sha1_to_hex(result), name);
+ git_SHA1_Init(c);
+}
+
+static int remove_space(char *line)
+{
+ char *src = line;
+ char *dst = line;
+ unsigned char c;
+
+ while ((c = *src++) != '\0') {
+ if (!isspace(c))
+ *dst++ = c;
+ }
+ return dst - line;
+}
+
+static int scan_hunk_header(const char *p, int *p_before, int *p_after)
+{
+ static const char digits[] = "0123456789";
+ const char *q, *r;
+ int n;
+
+ q = p + 4;
+ n = strspn(q, digits);
+ if (q[n] == ',') {
+ q += n + 1;
+ n = strspn(q, digits);
+ }
+ if (n == 0 || q[n] != ' ' || q[n+1] != '+')
+ return 0;
+
+ r = q + n + 2;
+ n = strspn(r, digits);
+ if (r[n] == ',') {
+ r += n + 1;
+ n = strspn(r, digits);
+ }
+ if (n == 0)
+ return 0;
+
+ *p_before = atoi(q);
+ *p_after = atoi(r);
+ return 1;
+}
+
+static int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx)
+{
+ static char line[1000];
+ int patchlen = 0, found_next = 0;
+ int before = -1, after = -1;
+
+ while (fgets(line, sizeof(line), stdin) != NULL) {
+ char *p = line;
+ int len;
+
+ if (!memcmp(line, "diff-tree ", 10))
+ p += 10;
+ else if (!memcmp(line, "commit ", 7))
+ p += 7;
+ else if (!memcmp(line, "From ", 5))
+ p += 5;
+ else if (!memcmp(line, "\\ ", 2) && 12 < strlen(line))
+ continue;
+
+ if (!get_sha1_hex(p, next_sha1)) {
+ found_next = 1;
+ break;
+ }
+
+ /* Ignore commit comments */
+ if (!patchlen && memcmp(line, "diff ", 5))
+ continue;
+
+ /* Parsing diff header? */
+ if (before == -1) {
+ if (!memcmp(line, "index ", 6))
+ continue;
+ else if (!memcmp(line, "--- ", 4))
+ before = after = 1;
+ else if (!isalpha(line[0]))
+ break;
+ }
+
+ /* Looking for a valid hunk header? */
+ if (before == 0 && after == 0) {
+ if (!memcmp(line, "@@ -", 4)) {
+ /* Parse next hunk, but ignore line numbers. */
+ scan_hunk_header(line, &before, &after);
+ continue;
+ }
+
+ /* Split at the end of the patch. */
+ if (memcmp(line, "diff ", 5))
+ break;
+
+ /* Else we're parsing another header. */
+ before = after = -1;
+ }
+
+ /* If we get here, we're inside a hunk. */
+ if (line[0] == '-' || line[0] == ' ')
+ before--;
+ if (line[0] == '+' || line[0] == ' ')
+ after--;
+
+ /* Compute the sha without whitespace */
+ len = remove_space(line);
+ patchlen += len;
+ git_SHA1_Update(ctx, line, len);
+ }
+
+ if (!found_next)
+ hashclr(next_sha1);
+
+ return patchlen;
+}
+
+static void generate_id_list(void)
+{
+ unsigned char sha1[20], n[20];
+ git_SHA_CTX ctx;
+ int patchlen;
+
+ git_SHA1_Init(&ctx);
+ hashclr(sha1);
+ while (!feof(stdin)) {
+ patchlen = get_one_patchid(n, &ctx);
+ flush_current_id(patchlen, sha1, &ctx);
+ hashcpy(sha1, n);
+ }
+}
+
+static const char patch_id_usage[] = "git patch-id < patch";
+
+int cmd_patch_id(int argc, const char **argv, const char *prefix)
+{
+ if (argc != 1)
+ usage(patch_id_usage);
+
+ generate_id_list();
+ return 0;
+}