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 const char *pickaxe = NULL;
   9 static int pickaxe_opts = 0;
  10 static int line_termination = '\n';
  11 static int inter_name_termination = '\t';
  12
  13 static const char *diff_helper_usage =
  14         "git-diff-helper [-z] [-S<string>] paths...";
  15
  16 int main(int ac, const char **av) {
  17         struct strbuf sb;
  18         const char *garbage_flush_format;
  19
  20         strbuf_init(&sb);
  21
  22         while (1 < ac && av[1][0] == '-') {
  23                 if (av[1][1] == 'z')
  24                         line_termination = inter_name_termination = 0;
  25                 else if (av[1][1] == 'S') {
  26                         pickaxe = av[1] + 2;
  27                 }
  28                 else if (!strcmp(av[1], "--pickaxe-all"))
  29                         pickaxe_opts = DIFF_PICKAXE_ALL;
  30                 else
  31                         usage(diff_helper_usage);
  32                 ac--; av++;
  33         }
  34         garbage_flush_format = (line_termination == 0) ? "%s" : "%s\n";
  35
  36         /* the remaining parameters are paths patterns */
  37
  38         diff_setup(0);
  39         while (1) {
  40                 unsigned old_mode, new_mode;
  41                 unsigned char old_sha1[20], new_sha1[20];
  42                 char old_path[PATH_MAX];
  43                 int status, score, two_paths;
  44                 char new_path[PATH_MAX];
  45
  46                 int ch;
  47                 char *cp, *ep;
  48
  49                 read_line(&sb, stdin, line_termination);
  50                 if (sb.eof)
  51                         break;
  52                 switch (sb.buf[0]) {
  53                 case ':':
  54                         /* parse the first part up to the status */
  55                         cp = sb.buf + 1;
  56                         old_mode = new_mode = 0;
  57                         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  58                                 old_mode = (old_mode << 3) | (ch - '0');
  59                                 cp++;
  60                         }
  61                         if (*cp++ != ' ')
  62                                 break;
  63                         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  64                                 new_mode = (new_mode << 3) | (ch - '0');
  65                                 cp++;
  66                         }
  67                         if (*cp++ != ' ')
  68                                 break;
  69                         if (get_sha1_hex(cp, old_sha1))
  70                                 break;
  71                         cp += 40;
  72                         if (*cp++ != ' ')
  73                                 break;
  74                         if (get_sha1_hex(cp, new_sha1))
  75                                 break;
  76                         cp += 40;
  77                         if (*cp++ != ' ')
  78                                 break;
  79                         status = *cp++;
  80                         if (!strchr("MCRNDU", status))
  81                                 break;
  82                         two_paths = score = 0;
  83                         if (status == 'R' || status == 'C')
  84                                 two_paths = 1;
  85
  86                         /* pick up score if exists */
  87                         if (sscanf(cp, "%d", &score) != 1)
  88                                 score = 0;
  89                         cp = strchr(cp,
  90                                     inter_name_termination);
  91                         if (!cp)
  92                                 break;
  93                         if (*cp++ != inter_name_termination)
  94                                 break;
  95
  96                         /* first pathname */
  97                         if (!line_termination) {
  98                                 read_line(&sb, stdin, line_termination);
  99                                 if (sb.eof)
 100                                         break;
 101                                 strcpy(old_path, sb.buf);
 102                         }
 103                         else if (!two_paths)
 104                                 strcpy(old_path, cp);
 105                         else {
 106                                 ep = strchr(cp, inter_name_termination);
 107                                 if (!ep)
 108                                         break;
 109                                 strncpy(old_path, cp, ep-cp);
 110                                 old_path[ep-cp] = 0;
 111                                 cp = ep + 1;
 112                         }
 113
 114                         /* second pathname */
 115                         if (!two_paths)
 116                                 strcpy(new_path, old_path);
 117                         else {
 118                                 if (!line_termination) {
 119                                         read_line(&sb, stdin,
 120                                                   line_termination);
 121                                         if (sb.eof)
 122                                                 break;
 123                                         strcpy(new_path, sb.buf);
 124                                 }
 125                                 else
 126                                         strcpy(new_path, cp);
 127                         }
 128                         diff_helper_input(old_mode, new_mode,
 129                                           old_sha1, new_sha1,
 130                                           old_path, status, score,
 131                                           new_path);
 132                         continue;
 133                 }
 134                 if (1 < ac)
 135                         diffcore_pathspec(av + 1);
 136                 if (pickaxe)
 137                         diffcore_pickaxe(pickaxe, pickaxe_opts);
 138                 diff_flush(DIFF_FORMAT_PATCH, 0);
 139                 printf(garbage_flush_format, sb.buf);
 140         }
 141         if (1 < ac)
 142                 diffcore_pathspec(av + 1);
 143         if (pickaxe)
 144                 diffcore_pickaxe(pickaxe, pickaxe_opts);
 145         diff_flush(DIFF_FORMAT_PATCH, 0);
 146         return 0;
 147 }