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
  31int 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
  74static 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
  89static const char patch_id_usage[] = "git patch-id < patch";
  90
  91int 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}