Andrew's git - gitweb.git/blob - builtin/patch-id.c

   1#include "builtin.h"
   2
   3static 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
  17static 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
  30static 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
  59static 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
 131static 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
 146static const char patch_id_usage[] = "git patch-id < patch";
 147
 148int 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}