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