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 const char *orderfile = NULL;
  11 static const char *diff_filter = NULL;
  12 static int line_termination = '\n';
  13 static int inter_name_termination = '\t';
  14
  15 static void flush_them(int ac, const char **av)
  16 {
  17         diffcore_std_no_resolve(av + 1,
  18                                 pickaxe, pickaxe_opts,
  19                                 orderfile, diff_filter);
  20         diff_flush(DIFF_FORMAT_PATCH);
  21 }
  22
  23 static const char *diff_helper_usage =
  24 "git-diff-helper [-z] [-O<orderfile>] [-S<string>] [--pickaxe-all] [<path>...]";
  25
  26 int main(int ac, const char **av) {
  27         struct strbuf sb;
  28         const char *garbage_flush_format;
  29
  30         strbuf_init(&sb);
  31
  32         while (1 < ac && av[1][0] == '-') {
  33                 if (av[1][1] == 'z')
  34                         line_termination = inter_name_termination = 0;
  35                 else if (av[1][1] == 'S') {
  36                         pickaxe = av[1] + 2;
  37                 }
  38                 else if (!strcmp(av[1], "--pickaxe-all"))
  39                         pickaxe_opts = DIFF_PICKAXE_ALL;
  40                 else if (!strncmp(av[1], "--diff-filter=", 14))
  41                         diff_filter = av[1] + 14;
  42                 else if (!strncmp(av[1], "-O", 2))
  43                         orderfile = av[1] + 2;
  44                 else
  45                         usage(diff_helper_usage);
  46                 ac--; av++;
  47         }
  48         garbage_flush_format = (line_termination == 0) ? "%s" : "%s\n";
  49
  50         /* the remaining parameters are paths patterns */
  51
  52         diff_setup(0);
  53         while (1) {
  54                 unsigned old_mode, new_mode;
  55                 unsigned char old_sha1[20], new_sha1[20];
  56                 char old_path[PATH_MAX];
  57                 int status, score, two_paths;
  58                 char new_path[PATH_MAX];
  59
  60                 int ch;
  61                 char *cp, *ep;
  62
  63                 read_line(&sb, stdin, line_termination);
  64                 if (sb.eof)
  65                         break;
  66                 switch (sb.buf[0]) {
  67                 case ':':
  68                         /* parse the first part up to the status */
  69                         cp = sb.buf + 1;
  70                         old_mode = new_mode = 0;
  71                         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  72                                 old_mode = (old_mode << 3) | (ch - '0');
  73                                 cp++;
  74                         }
  75                         if (*cp++ != ' ')
  76                                 break;
  77                         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  78                                 new_mode = (new_mode << 3) | (ch - '0');
  79                                 cp++;
  80                         }
  81                         if (*cp++ != ' ')
  82                                 break;
  83                         if (get_sha1_hex(cp, old_sha1))
  84                                 break;
  85                         cp += 40;
  86                         if (*cp++ != ' ')
  87                                 break;
  88                         if (get_sha1_hex(cp, new_sha1))
  89                                 break;
  90                         cp += 40;
  91                         if (*cp++ != ' ')
  92                                 break;
  93                         status = *cp++;
  94                         if (!strchr("MCRNDU", status))
  95                                 break;
  96                         two_paths = score = 0;
  97                         if (status == 'R' || status == 'C')
  98                                 two_paths = 1;
  99
 100                         /* pick up score if exists */
 101                         if (sscanf(cp, "%d", &score) != 1)
 102                                 score = 0;
 103                         cp = strchr(cp,
 104                                     inter_name_termination);
 105                         if (!cp)
 106                                 break;
 107                         if (*cp++ != inter_name_termination)
 108                                 break;
 109
 110                         /* first pathname */
 111                         if (!line_termination) {
 112                                 read_line(&sb, stdin, line_termination);
 113                                 if (sb.eof)
 114                                         break;
 115                                 strcpy(old_path, sb.buf);
 116                         }
 117                         else if (!two_paths)
 118                                 strcpy(old_path, cp);
 119                         else {
 120                                 ep = strchr(cp, inter_name_termination);
 121                                 if (!ep)
 122                                         break;
 123                                 strncpy(old_path, cp, ep-cp);
 124                                 old_path[ep-cp] = 0;
 125                                 cp = ep + 1;
 126                         }
 127
 128                         /* second pathname */
 129                         if (!two_paths)
 130                                 strcpy(new_path, old_path);
 131                         else {
 132                                 if (!line_termination) {
 133                                         read_line(&sb, stdin,
 134                                                   line_termination);
 135                                         if (sb.eof)
 136                                                 break;
 137                                         strcpy(new_path, sb.buf);
 138                                 }
 139                                 else
 140                                         strcpy(new_path, cp);
 141                         }
 142                         diff_helper_input(old_mode, new_mode,
 143                                           old_sha1, new_sha1,
 144                                           old_path, status, score,
 145                                           new_path);
 146                         continue;
 147                 }
 148                 flush_them(ac, av);
 149                 printf(garbage_flush_format, sb.buf);
 150         }
 151         flush_them(ac, av);
 152         return 0;
 153 }