builtin/patch-id.c

   1 #include "cache.h"
   2 #include "exec_cmd.h"
   3
   4 static void flush_current_id(int patchlen, unsigned char *id, git_SHA_CTX *c)
   5 {
   6         unsigned char result[20];
   7         char name[50];
   8
   9         if (!patchlen)
  10                 return;
  11
  12         git_SHA1_Final(result, c);
  13         memcpy(name, sha1_to_hex(id), 41);
  14         printf("%s %s\n", sha1_to_hex(result), name);
  15         git_SHA1_Init(c);
  16 }
  17
  18 static int remove_space(char *line)
  19 {
  20         char *src = line;
  21         char *dst = line;
  22         unsigned char c;
  23
  24         while ((c = *src++) != '\0') {
  25                 if (!isspace(c))
  26                         *dst++ = c;
  27         }
  28         return dst - line;
  29 }
  30
  31 int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx)
  32 {
  33         static char line[1000];
  34         int patchlen = 0, found_next = 0;
  35
  36         while (fgets(line, sizeof(line), stdin) != NULL) {
  37                 char *p = line;
  38                 int len;
  39
  40                 if (!memcmp(line, "diff-tree ", 10))
  41                         p += 10;
  42                 else if (!memcmp(line, "commit ", 7))
  43                         p += 7;
  44
  45                 if (!get_sha1_hex(p, next_sha1)) {
  46                         found_next = 1;
  47                         break;
  48                 }
  49
  50                 /* Ignore commit comments */
  51                 if (!patchlen && memcmp(line, "diff ", 5))
  52                         continue;
  53
  54                 /* Ignore git-diff index header */
  55                 if (!memcmp(line, "index ", 6))
  56                         continue;
  57
  58                 /* Ignore line numbers when computing the SHA1 of the patch */
  59                 if (!memcmp(line, "@@ -", 4))
  60                         continue;
  61
  62                 /* Compute the sha without whitespace */
  63                 len = remove_space(line);
  64                 patchlen += len;
  65                 git_SHA1_Update(ctx, line, len);
  66         }
  67
  68         if (!found_next)
  69                 hashclr(next_sha1);
  70
  71         return patchlen;
  72 }
  73
  74 static void generate_id_list(void)
  75 {
  76         unsigned char sha1[20], n[20];
  77         git_SHA_CTX ctx;
  78         int patchlen;
  79
  80         git_SHA1_Init(&ctx);
  81         hashclr(sha1);
  82         while (!feof(stdin)) {
  83                 patchlen = get_one_patchid(n, &ctx);
  84                 flush_current_id(patchlen, sha1, &ctx);
  85                 hashcpy(sha1, n);
  86         }
  87 }
  88
  89 static const char patch_id_usage[] = "git patch-id < patch";
  90
  91 int cmd_patch_id(int argc, const char **argv, const char *prefix)
  92 {
  93         if (argc != 1)
  94                 usage(patch_id_usage);
  95
  96         generate_id_list();
  97         return 0;
  98 }