diff-helper.c

   1 /*
   2  * Copyright (C) 2005 Junio C Hamano
   3  */
   4 #include "cache.h"
   5 #include "strbuf.h"
   6 #include "diff.h"
   7
   8 static int detect_rename = 0;
   9 static int diff_score_opt = 0;
  10 static const char *pickaxe = NULL;
  11 static int diff_output_style = DIFF_FORMAT_PATCH;
  12 static int line_termination = '\n';
  13 static int inter_name_termination = '\t';
  14
  15 static int parse_diff_raw(char *buf1, char *buf2, char *buf3)
  16 {
  17         char old_path[PATH_MAX];
  18         unsigned char old_sha1[20], new_sha1[20];
  19         char *ep;
  20         char *cp = buf1;
  21         int ch, old_mode, new_mode;
  22
  23         old_mode = new_mode = 0;
  24         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  25                 old_mode = (old_mode << 3) | (ch - '0');
  26                 cp++;
  27         }
  28         if (*cp++ != ' ')
  29                 return -1;
  30         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  31                 new_mode = (new_mode << 3) | (ch - '0');
  32                 cp++;
  33         }
  34         if (*cp++ != ' ')
  35                 return -1;
  36         if (get_sha1_hex(cp, old_sha1))
  37                 return -1;
  38         cp += 40;
  39         if (*cp++ != ' ')
  40                 return -1;
  41         if (get_sha1_hex(cp, new_sha1))
  42                 return -1;
  43         cp += 40;
  44         if (*cp++ != inter_name_termination)
  45                 return -1;
  46         if (buf2)
  47                 cp = buf2;
  48         ep = strchr(cp, inter_name_termination);
  49         if (!ep)
  50                 return -1;
  51         *ep++ = 0;
  52         strcpy(old_path, cp);
  53         diff_guif(old_mode, new_mode, old_sha1, new_sha1,
  54                   old_path, buf3 ? buf3 : ep);
  55         return 0;
  56 }
  57
  58 static const char *diff_helper_usage =
  59         "git-diff-helper [-z] [-R] [-M] [-C] [-S<string>] paths...";
  60
  61 int main(int ac, const char **av) {
  62         struct strbuf sb1, sb2, sb3;
  63         int reverse_diff = 0;
  64
  65         strbuf_init(&sb1);
  66         strbuf_init(&sb2);
  67         strbuf_init(&sb3);
  68
  69         while (1 < ac && av[1][0] == '-') {
  70                 if (av[1][1] == 'R')
  71                         reverse_diff = 1;
  72                 else if (av[1][1] == 'z')
  73                         line_termination = inter_name_termination = 0;
  74                 else if (av[1][1] == 'p') /* hidden from the help */
  75                         diff_output_style = DIFF_FORMAT_HUMAN;
  76                 else if (av[1][1] == 'P') /* hidden from the help */
  77                         diff_output_style = DIFF_FORMAT_MACHINE;
  78                 else if (av[1][1] == 'M') {
  79                         detect_rename = DIFF_DETECT_RENAME;
  80                         diff_score_opt = diff_scoreopt_parse(av[1]);
  81                 }
  82                 else if (av[1][1] == 'C') {
  83                         detect_rename = DIFF_DETECT_COPY;
  84                         diff_score_opt = diff_scoreopt_parse(av[1]);
  85                 }
  86                 else if (av[1][1] == 'S') {
  87                         pickaxe = av[1] + 2;
  88                 }
  89                 else
  90                         usage(diff_helper_usage);
  91                 ac--; av++;
  92         }
  93         /* the remaining parameters are paths patterns */
  94
  95         diff_setup(reverse_diff);
  96         while (1) {
  97                 int status;
  98                 read_line(&sb1, stdin, line_termination);
  99                 if (sb1.eof)
 100                         break;
 101                 switch (sb1.buf[0]) {
 102                 case 'U':
 103                         diff_unmerge(sb1.buf + 2);
 104                         continue;
 105                 case ':':
 106                         break;
 107                 default:
 108                         goto unrecognized;
 109                 }
 110                 if (!line_termination) {
 111                         read_line(&sb2, stdin, line_termination);
 112                         if (sb2.eof)
 113                                 break;
 114                         read_line(&sb3, stdin, line_termination);
 115                         if (sb3.eof)
 116                                 break;
 117                         status = parse_diff_raw(sb1.buf+1, sb2.buf, sb3.buf);
 118                 }
 119                 else
 120                         status = parse_diff_raw(sb1.buf+1, NULL, NULL);
 121                 if (status) {
 122                 unrecognized:
 123                         diff_flush(diff_output_style);
 124                         printf("%s%c", sb1.buf, line_termination);
 125                 }
 126         }
 127         if (detect_rename)
 128                 diffcore_rename(detect_rename, diff_score_opt);
 129         diffcore_prune();
 130         if (pickaxe)
 131                 diffcore_pickaxe(pickaxe);
 132         if (ac)
 133                 diffcore_pathspec(av + 1);
 134         diff_flush(diff_output_style);
 135         return 0;
 136 }