builtin/patch-id.c

   1 #include "builtin.h"
   2
   3 static void flush_current_id(int patchlen, unsigned char *id, git_SHA_CTX *c)
   4 {
   5         unsigned char result[20];
   6         char name[50];
   7
   8         if (!patchlen)
   9                 return;
  10
  11         git_SHA1_Final(result, c);
  12         memcpy(name, sha1_to_hex(id), 41);
  13         printf("%s %s\n", sha1_to_hex(result), name);
  14         git_SHA1_Init(c);
  15 }
  16
  17 static int remove_space(char *line)
  18 {
  19         char *src = line;
  20         char *dst = line;
  21         unsigned char c;
  22
  23         while ((c = *src++) != '\0') {
  24                 if (!isspace(c))
  25                         *dst++ = c;
  26         }
  27         return dst - line;
  28 }
  29
  30 static int scan_hunk_header(const char *p, int *p_before, int *p_after)
  31 {
  32         static const char digits[] = "0123456789";
  33         const char *q, *r;
  34         int n;
  35
  36         q = p + 4;
  37         n = strspn(q, digits);
  38         if (q[n] == ',') {
  39                 q += n + 1;
  40                 n = strspn(q, digits);
  41         }
  42         if (n == 0 || q[n] != ' ' || q[n+1] != '+')
  43                 return 0;
  44
  45         r = q + n + 2;
  46         n = strspn(r, digits);
  47         if (r[n] == ',') {
  48                 r += n + 1;
  49                 n = strspn(r, digits);
  50         }
  51         if (n == 0)
  52                 return 0;
  53
  54         *p_before = atoi(q);
  55         *p_after = atoi(r);
  56         return 1;
  57 }
  58
  59 static int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx)
  60 {
  61         static char line[1000];
  62         int patchlen = 0, found_next = 0;
  63         int before = -1, after = -1;
  64
  65         while (fgets(line, sizeof(line), stdin) != NULL) {
  66                 char *p = line;
  67                 int len;
  68
  69                 if (!memcmp(line, "diff-tree ", 10))
  70                         p += 10;
  71                 else if (!memcmp(line, "commit ", 7))
  72                         p += 7;
  73                 else if (!memcmp(line, "From ", 5))
  74                         p += 5;
  75                 else if (!memcmp(line, "\\ ", 2) && 12 < strlen(line))
  76                         continue;
  77
  78                 if (!get_sha1_hex(p, next_sha1)) {
  79                         found_next = 1;
  80                         break;
  81                 }
  82
  83                 /* Ignore commit comments */
  84                 if (!patchlen && memcmp(line, "diff ", 5))
  85                         continue;
  86
  87                 /* Parsing diff header?  */
  88                 if (before == -1) {
  89                         if (!memcmp(line, "index ", 6))
  90                                 continue;
  91                         else if (!memcmp(line, "--- ", 4))
  92                                 before = after = 1;
  93                         else if (!isalpha(line[0]))
  94                                 break;
  95                 }
  96
  97                 /* Looking for a valid hunk header?  */
  98                 if (before == 0 && after == 0) {
  99                         if (!memcmp(line, "@@ -", 4)) {
 100                                 /* Parse next hunk, but ignore line numbers.  */
 101                                 scan_hunk_header(line, &before, &after);
 102                                 continue;
 103                         }
 104
 105                         /* Split at the end of the patch.  */
 106                         if (memcmp(line, "diff ", 5))
 107                                 break;
 108
 109                         /* Else we're parsing another header.  */
 110                         before = after = -1;
 111                 }
 112
 113                 /* If we get here, we're inside a hunk.  */
 114                 if (line[0] == '-' || line[0] == ' ')
 115                         before--;
 116                 if (line[0] == '+' || line[0] == ' ')
 117                         after--;
 118
 119                 /* Compute the sha without whitespace */
 120                 len = remove_space(line);
 121                 patchlen += len;
 122                 git_SHA1_Update(ctx, line, len);
 123         }
 124
 125         if (!found_next)
 126                 hashclr(next_sha1);
 127
 128         return patchlen;
 129 }
 130
 131 static void generate_id_list(void)
 132 {
 133         unsigned char sha1[20], n[20];
 134         git_SHA_CTX ctx;
 135         int patchlen;
 136
 137         git_SHA1_Init(&ctx);
 138         hashclr(sha1);
 139         while (!feof(stdin)) {
 140                 patchlen = get_one_patchid(n, &ctx);
 141                 flush_current_id(patchlen, sha1, &ctx);
 142                 hashcpy(sha1, n);
 143         }
 144 }
 145
 146 static const char patch_id_usage[] = "git patch-id < patch";
 147
 148 int cmd_patch_id(int argc, const char **argv, const char *prefix)
 149 {
 150         if (argc != 1)
 151                 usage(patch_id_usage);
 152
 153         generate_id_list();
 154         return 0;
 155 }