Sync with 1.7.9.5

[git.git] / builtin / patch-id.c

diff --git a/builtin/patch-id.c b/builtin/patch-id.c
index af0911e4bd54848eadc7485c985e2a010e720e7f..3cfe02d5a5716de1a3aaa5edc1ca0e3d74c03b03 100644 (file)
--- a/builtin/patch-id.c
+++ b/builtin/patch-id.c
@@ -1,5 +1,4 @@
-#include "cache.h"
-#include "exec_cmd.h"
+#include "builtin.h"
 
 static void flush_current_id(int patchlen, unsigned char *id, git_SHA_CTX *c)
 {
@@ -28,16 +27,42 @@ static int remove_space(char *line)
        return dst - line;
 }
 
-static void generate_id_list(void)
+static int scan_hunk_header(const char *p, int *p_before, int *p_after)
 {
-       static unsigned char sha1[20];
-       static char line[1000];
-       git_SHA_CTX ctx;
-       int patchlen = 0;
+       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;
 
-       git_SHA1_Init(&ctx);
-       while (fgets(line, sizeof(line), stdin) != NULL) {
-               unsigned char n[20];
+       *p_before = atoi(q);
+       *p_after = atoi(r);
+       return 1;
+}
+
+static int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx, struct strbuf *line_buf)
+{
+       int patchlen = 0, found_next = 0;
+       int before = -1, after = -1;
+
+       while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
+               char *line = line_buf->buf;
                char *p = line;
                int len;
 
@@ -45,32 +70,79 @@ static void generate_id_list(void)
                        p += 10;
                else if (!memcmp(line, "commit ", 7))
                        p += 7;
-
-               if (!get_sha1_hex(p, n)) {
-                       flush_current_id(patchlen, sha1, &ctx);
-                       hashcpy(sha1, n);
-                       patchlen = 0;
+               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;
 
-               /* Ignore git-diff index header */
-               if (!memcmp(line, "index ", 6))
-                       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;
+               }
 
-               /* Ignore line numbers when computing the SHA1 of the patch */
-               if (!memcmp(line, "@@ -", 4))
-                       continue;
+               /* 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);
+               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;
+       struct strbuf line_buf = STRBUF_INIT;
+
+       git_SHA1_Init(&ctx);
+       hashclr(sha1);
+       while (!feof(stdin)) {
+               patchlen = get_one_patchid(n, &ctx, &line_buf);
+               flush_current_id(patchlen, sha1, &ctx);
+               hashcpy(sha1, n);
        }
-       flush_current_id(patchlen, sha1, &ctx);
+       strbuf_release(&line_buf);
 }
 
 static const char patch_id_usage[] = "git patch-id < patch";