Andrew's git - gitweb.git/blob - builtin-patch-id.c

   1#include "cache.h"
   2#include "exec_cmd.h"
   3
   4static 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
  18static 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
  31static void generate_id_list(void)
  32{
  33        static unsigned char sha1[20];
  34        static char line[1000];
  35        git_SHA_CTX ctx;
  36        int patchlen = 0;
  37
  38        git_SHA1_Init(&ctx);
  39        while (fgets(line, sizeof(line), stdin) != NULL) {
  40                unsigned char n[20];
  41                char *p = line;
  42                int len;
  43
  44                if (!memcmp(line, "diff-tree ", 10))
  45                        p += 10;
  46                else if (!memcmp(line, "commit ", 7))
  47                        p += 7;
  48
  49                if (!get_sha1_hex(p, n)) {
  50                        flush_current_id(patchlen, sha1, &ctx);
  51                        hashcpy(sha1, n);
  52                        patchlen = 0;
  53                        continue;
  54                }
  55
  56                /* Ignore commit comments */
  57                if (!patchlen && memcmp(line, "diff ", 5))
  58                        continue;
  59
  60                /* Ignore git-diff index header */
  61                if (!memcmp(line, "index ", 6))
  62                        continue;
  63
  64                /* Ignore line numbers when computing the SHA1 of the patch */
  65                if (!memcmp(line, "@@ -", 4))
  66                        continue;
  67
  68                /* Compute the sha without whitespace */
  69                len = remove_space(line);
  70                patchlen += len;
  71                git_SHA1_Update(&ctx, line, len);
  72        }
  73        flush_current_id(patchlen, sha1, &ctx);
  74}
  75
  76static const char patch_id_usage[] = "git patch-id < patch";
  77
  78int cmd_patch_id(int argc, const char **argv, const char *prefix)
  79{
  80        if (argc != 1)
  81                usage(patch_id_usage);
  82
  83        generate_id_list();
  84        return 0;
  85}