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 static int scan_hunk_header(const char *p, int *p_before, int *p_after)
  32 {
  33         static const char digits[] = "0123456789";
  34         const char *q, *r;
  35         int n;
  36
  37         q = p + 4;
  38         n = strspn(q, digits);
  39         if (q[n] == ',') {
  40                 q += n + 1;
  41                 n = strspn(q, digits);
  42         }
  43         if (n == 0 || q[n] != ' ' || q[n+1] != '+')
  44                 return 0;
  45
  46         r = q + n + 2;
  47         n = strspn(r, digits);
  48         if (r[n] == ',') {
  49                 r += n + 1;
  50                 n = strspn(r, digits);
  51         }
  52         if (n == 0)
  53                 return 0;
  54
  55         *p_before = atoi(q);
  56         *p_after = atoi(r);
  57         return 1;
  58 }
  59
  60 int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx)
  61 {
  62         static char line[1000];
  63         int patchlen = 0, found_next = 0;
  64         int before = -1, after = -1;
  65
  66         while (fgets(line, sizeof(line), stdin) != NULL) {
  67                 char *p = line;
  68                 int len;
  69
  70                 if (!memcmp(line, "diff-tree ", 10))
  71                         p += 10;
  72                 else if (!memcmp(line, "commit ", 7))
  73                         p += 7;
  74                 else if (!memcmp(line, "From ", 5))
  75                         p += 5;
  76                 else if (!memcmp(line, "\\ ", 2) && 12 < strlen(line))
  77                         continue;
  78
  79                 if (!get_sha1_hex(p, next_sha1)) {
  80                         found_next = 1;
  81                         break;
  82                 }
  83
  84                 /* Ignore commit comments */
  85                 if (!patchlen && memcmp(line, "diff ", 5))
  86                         continue;
  87
  88                 /* Parsing diff header?  */
  89                 if (before == -1) {
  90                         if (!memcmp(line, "index ", 6))
  91                                 continue;
  92                         else if (!memcmp(line, "--- ", 4))
  93                                 before = after = 1;
  94                         else if (!isalpha(line[0]))
  95                                 break;
  96                 }
  97
  98                 /* Looking for a valid hunk header?  */
  99                 if (before == 0 && after == 0) {
 100                         if (!memcmp(line, "@@ -", 4)) {
 101                                 /* Parse next hunk, but ignore line numbers.  */
 102                                 scan_hunk_header(line, &before, &after);
 103                                 continue;
 104                         }
 105
 106                         /* Split at the end of the patch.  */
 107                         if (memcmp(line, "diff ", 5))
 108                                 break;
 109
 110                         /* Else we're parsing another header.  */
 111                         before = after = -1;
 112                 }
 113
 114                 /* If we get here, we're inside a hunk.  */
 115                 if (line[0] == '-' || line[0] == ' ')
 116                         before--;
 117                 if (line[0] == '+' || line[0] == ' ')
 118                         after--;
 119
 120                 /* Compute the sha without whitespace */
 121                 len = remove_space(line);
 122                 patchlen += len;
 123                 git_SHA1_Update(ctx, line, len);
 124         }
 125
 126         if (!found_next)
 127                 hashclr(next_sha1);
 128
 129         return patchlen;
 130 }
 131
 132 static void generate_id_list(void)
 133 {
 134         unsigned char sha1[20], n[20];
 135         git_SHA_CTX ctx;
 136         int patchlen;
 137
 138         git_SHA1_Init(&ctx);
 139         hashclr(sha1);
 140         while (!feof(stdin)) {
 141                 patchlen = get_one_patchid(n, &ctx);
 142                 flush_current_id(patchlen, sha1, &ctx);
 143                 hashcpy(sha1, n);
 144         }
 145 }
 146
 147 static const char patch_id_usage[] = "git patch-id < patch";
 148
 149 int cmd_patch_id(int argc, const char **argv, const char *prefix)
 150 {
 151         if (argc != 1)
 152                 usage(patch_id_usage);
 153
 154         generate_id_list();
 155         return 0;
 156 }