improve missing repository error message
[git] / 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 static 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
76 static const char patch_id_usage[] = "git patch-id < patch";
77
78 int main(int argc, char **argv)
79 {
80         if (argc != 1)
81                 usage(patch_id_usage);
82
83         git_extract_argv0_path(argv[0]);
84
85         generate_id_list();
86         return 0;
87 }