diff-helper.c

   1 /*
   2  * Copyright (C) 2005 Junio C Hamano
   3  */
   4 #include <limits.h>
   5 #include "cache.h"
   6 #include "strbuf.h"
   7 #include "diff.h"
   8
   9 static int detect_rename = 0;
  10
  11 static int parse_oneside_change(const char *cp, int *mode,
  12                                 unsigned char *sha1, char *path)
  13 {
  14         int ch, m;
  15
  16         m = 0;
  17         while ((ch = *cp) && '0' <= ch && ch <= '7') {
  18                 m = (m << 3) | (ch - '0');
  19                 cp++;
  20         }
  21         *mode = m;
  22         if (strncmp(cp, "\tblob\t", 6))
  23                 return -1;
  24         cp += 6;
  25         if (get_sha1_hex(cp, sha1))
  26                 return -1;
  27         cp += 40;
  28         if (*cp++ != '\t')
  29                 return -1;
  30         strcpy(path, cp);
  31         return 0;
  32 }
  33
  34 static int parse_diff_raw_output(const char *buf)
  35 {
  36         char path[PATH_MAX];
  37         unsigned char old_sha1[20], new_sha1[20];
  38         const char *cp = buf;
  39         int ch, old_mode, new_mode;
  40
  41         switch (*cp++) {
  42         case 'U':
  43                 diff_unmerge(cp + 1);
  44                 break;
  45         case '+':
  46                 parse_oneside_change(cp, &new_mode, new_sha1, path);
  47                 diff_addremove('+', new_mode, new_sha1, path, NULL);
  48                 break;
  49         case '-':
  50                 parse_oneside_change(cp, &old_mode, old_sha1, path);
  51                 diff_addremove('-', old_mode, old_sha1, path, NULL);
  52                 break;
  53         case '*':
  54                 old_mode = new_mode = 0;
  55                 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  56                         old_mode = (old_mode << 3) | (ch - '0');
  57                         cp++;
  58                 }
  59                 if (strncmp(cp, "->", 2))
  60                         return -1;
  61                 cp += 2;
  62                 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  63                         new_mode = (new_mode << 3) | (ch - '0');
  64                         cp++;
  65                 }
  66                 if (strncmp(cp, "\tblob\t", 6))
  67                         return -1;
  68                 cp += 6;
  69                 if (get_sha1_hex(cp, old_sha1))
  70                         return -1;
  71                 cp += 40;
  72                 if (strncmp(cp, "->", 2))
  73                         return -1;
  74                 cp += 2;
  75                 if (get_sha1_hex(cp, new_sha1))
  76                         return -1;
  77                 cp += 40;
  78                 if (*cp++ != '\t')
  79                         return -1;
  80                 strcpy(path, cp);
  81                 diff_change(old_mode, new_mode, old_sha1, new_sha1, path, 0);
  82                 break;
  83         default:
  84                 return -1;
  85         }
  86         return 0;
  87 }
  88
  89 static const char *diff_helper_usage =
  90         "git-diff-helper [-z] [-R] [-M] paths...";
  91
  92 int main(int ac, const char **av) {
  93         struct strbuf sb;
  94         int reverse = 0;
  95         int line_termination = '\n';
  96
  97         strbuf_init(&sb);
  98
  99         while (1 < ac && av[1][0] == '-') {
 100                 if (av[1][1] == 'R')
 101                         reverse = 1;
 102                 else if (av[1][1] == 'z')
 103                         line_termination = 0;
 104                 else if (av[1][1] == 'M')
 105                         detect_rename = 1;
 106                 else
 107                         usage(diff_helper_usage);
 108                 ac--; av++;
 109         }
 110         /* the remaining parameters are paths patterns */
 111
 112         diff_setup(detect_rename, 0, reverse, av+1, ac-1);
 113
 114         while (1) {
 115                 int status;
 116                 read_line(&sb, stdin, line_termination);
 117                 if (sb.eof)
 118                         break;
 119                 status = parse_diff_raw_output(sb.buf);
 120                 if (status) {
 121                         diff_flush();
 122                         printf("%s%c", sb.buf, line_termination);
 123                 }
 124         }
 125
 126         diff_flush();
 127         return 0;
 128 }