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 static int diff_score_opt = 0;
  11
  12 static int parse_oneside_change(const char *cp, int *mode,
  13                                 unsigned char *sha1, char *path)
  14 {
  15         int ch, m;
  16
  17         m = 0;
  18         while ((ch = *cp) && '0' <= ch && ch <= '7') {
  19                 m = (m << 3) | (ch - '0');
  20                 cp++;
  21         }
  22         *mode = m;
  23         if (strncmp(cp, "\tblob\t", 6) && strncmp(cp, " blob ", 6))
  24                 return -1;
  25         cp += 6;
  26         if (get_sha1_hex(cp, sha1))
  27                 return -1;
  28         cp += 40;
  29         if ((*cp != '\t') && *cp != ' ')
  30                 return -1;
  31         strcpy(path, ++cp);
  32         return 0;
  33 }
  34
  35 static int parse_diff_raw_output(const char *buf)
  36 {
  37         char path[PATH_MAX];
  38         unsigned char old_sha1[20], new_sha1[20];
  39         const char *cp = buf;
  40         int ch, old_mode, new_mode;
  41
  42         switch (*cp++) {
  43         case 'U':
  44                 diff_unmerge(cp + 1);
  45                 break;
  46         case '+':
  47                 parse_oneside_change(cp, &new_mode, new_sha1, path);
  48                 diff_addremove('+', new_mode, new_sha1, path, NULL);
  49                 break;
  50         case '-':
  51                 parse_oneside_change(cp, &old_mode, old_sha1, path);
  52                 diff_addremove('-', old_mode, old_sha1, path, NULL);
  53                 break;
  54         case '*':
  55                 old_mode = new_mode = 0;
  56                 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  57                         old_mode = (old_mode << 3) | (ch - '0');
  58                         cp++;
  59                 }
  60                 if (strncmp(cp, "->", 2))
  61                         return -1;
  62                 cp += 2;
  63                 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  64                         new_mode = (new_mode << 3) | (ch - '0');
  65                         cp++;
  66                 }
  67                 if (strncmp(cp, "\tblob\t", 6) && strncmp(cp, " blob ", 6))
  68                         return -1;
  69                 cp += 6;
  70                 if (get_sha1_hex(cp, old_sha1))
  71                         return -1;
  72                 cp += 40;
  73                 if (strncmp(cp, "->", 2))
  74                         return -1;
  75                 cp += 2;
  76                 if (get_sha1_hex(cp, new_sha1))
  77                         return -1;
  78                 cp += 40;
  79                 if ((*cp != '\t') && *cp != ' ')
  80                         return -1;
  81                 strcpy(path, ++cp);
  82                 diff_change(old_mode, new_mode, old_sha1, new_sha1, path, NULL);
  83                 break;
  84         default:
  85                 return -1;
  86         }
  87         return 0;
  88 }
  89
  90 static const char *diff_helper_usage =
  91         "git-diff-helper [-z] [-R] [-M] paths...";
  92
  93 int main(int ac, const char **av) {
  94         struct strbuf sb;
  95         int reverse = 0;
  96         int line_termination = '\n';
  97
  98         strbuf_init(&sb);
  99
 100         while (1 < ac && av[1][0] == '-') {
 101                 if (av[1][1] == 'R')
 102                         reverse = 1;
 103                 else if (av[1][1] == 'z')
 104                         line_termination = 0;
 105                 else if (av[1][1] == 'M') {
 106                         detect_rename = 1;
 107                         diff_score_opt = diff_scoreopt_parse(av[1]);
 108                 }
 109                 else
 110                         usage(diff_helper_usage);
 111                 ac--; av++;
 112         }
 113         /* the remaining parameters are paths patterns */
 114
 115         diff_setup(detect_rename, diff_score_opt, reverse, -1, av+1, ac-1);
 116
 117         while (1) {
 118                 int status;
 119                 read_line(&sb, stdin, line_termination);
 120                 if (sb.eof)
 121                         break;
 122                 status = parse_diff_raw_output(sb.buf);
 123                 if (status) {
 124                         diff_flush();
 125                         printf("%s%c", sb.buf, line_termination);
 126                 }
 127         }
 128
 129         diff_flush();
 130         return 0;
 131 }