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
  77                 if (!get_sha1_hex(p, next_sha1)) {
  78                         found_next = 1;
  79                         break;
  80                 }
  81
  82                 /* Ignore commit comments */
  83                 if (!patchlen && memcmp(line, "diff ", 5))
  84                         continue;
  85
  86                 /* Parsing diff header?  */
  87                 if (before == -1) {
  88                         if (!memcmp(line, "index ", 6))
  89                                 continue;
  90                         else if (!memcmp(line, "--- ", 4))
  91                                 before = after = 1;
  92                         else if (!isalpha(line[0]))
  93                                 break;
  94                 }
  95
  96                 /* Looking for a valid hunk header?  */
  97                 if (before == 0 && after == 0) {
  98                         if (!memcmp(line, "@@ -", 4)) {
  99                                 /* Parse next hunk, but ignore line numbers.  */
 100                                 scan_hunk_header(line, &before, &after);
 101                                 continue;
 102                         }
 103
 104                         /* Split at the end of the patch.  */
 105                         if (memcmp(line, "diff ", 5))
 106                                 break;
 107
 108                         /* Else we're parsing another header.  */
 109                         before = after = -1;
 110                 }
 111
 112                 /* If we get here, we're inside a hunk.  */
 113                 if (line[0] == '-' || line[0] == ' ')
 114                         before--;
 115                 if (line[0] == '+' || line[0] == ' ')
 116                         after--;
 117
 118                 /* Compute the sha without whitespace */
 119                 len = remove_space(line);
 120                 patchlen += len;
 121                 git_SHA1_Update(ctx, line, len);
 122         }
 123
 124         if (!found_next)
 125                 hashclr(next_sha1);
 126
 127         return patchlen;
 128 }
 129
 130 static void generate_id_list(void)
 131 {
 132         unsigned char sha1[20], n[20];
 133         git_SHA_CTX ctx;
 134         int patchlen;
 135
 136         git_SHA1_Init(&ctx);
 137         hashclr(sha1);
 138         while (!feof(stdin)) {
 139                 patchlen = get_one_patchid(n, &ctx);
 140                 flush_current_id(patchlen, sha1, &ctx);
 141                 hashcpy(sha1, n);
 142         }
 143 }
 144
 145 static const char patch_id_usage[] = "git patch-id < patch";
 146
 147 int cmd_patch_id(int argc, const char **argv, const char *prefix)
 148 {
 149         if (argc != 1)
 150                 usage(patch_id_usage);
 151
 152         generate_id_list();
 153         return 0;
 154 }