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
  19         strbuf_init(&sb);
  20
  21         while (1 < ac && av[1][0] == '-') {
  22                 if (av[1][1] == 'z')
  23                         line_termination = inter_name_termination = 0;
  24                 else if (av[1][1] == 'S') {
  25                         pickaxe = av[1] + 2;
  26                 }
  27                 else if (!strcmp(av[1], "--pickaxe-all"))
  28                         pickaxe_opts = DIFF_PICKAXE_ALL;
  29                 else
  30                         usage(diff_helper_usage);
  31                 ac--; av++;
  32         }
  33         /* the remaining parameters are paths patterns */
  34
  35         diff_setup(0);
  36         while (1) {
  37                 unsigned old_mode, new_mode;
  38                 unsigned char old_sha1[20], new_sha1[20];
  39                 char old_path[PATH_MAX];
  40                 int status, score, two_paths;
  41                 char new_path[PATH_MAX];
  42
  43                 int ch;
  44                 char *cp, *ep;
  45
  46                 read_line(&sb, stdin, line_termination);
  47                 if (sb.eof)
  48                         break;
  49                 switch (sb.buf[0]) {
  50                 case ':':
  51                         /* parse the first part up to the status */
  52                         cp = sb.buf + 1;
  53                         old_mode = new_mode = 0;
  54                         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  55                                 old_mode = (old_mode << 3) | (ch - '0');
  56                                 cp++;
  57                         }
  58                         if (*cp++ != ' ')
  59                                 break;
  60                         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  61                                 new_mode = (new_mode << 3) | (ch - '0');
  62                                 cp++;
  63                         }
  64                         if (*cp++ != ' ')
  65                                 break;
  66                         if (get_sha1_hex(cp, old_sha1))
  67                                 break;
  68                         cp += 40;
  69                         if (*cp++ != ' ')
  70                                 break;
  71                         if (get_sha1_hex(cp, new_sha1))
  72                                 break;
  73                         cp += 40;
  74                         if (*cp++ != ' ')
  75                                 break;
  76                         status = *cp++;
  77                         if (!strchr("MCRNDU", status))
  78                                 break;
  79                         two_paths = score = 0;
  80                         if (status == 'R' || status == 'C') {
  81                                 two_paths = 1;
  82                                 sscanf(cp, "%d", &score);
  83                                 if (line_termination) {
  84                                         cp = strchr(cp,
  85                                                     inter_name_termination);
  86                                         if (!cp)
  87                                                 break;
  88                                 }
  89                         }
  90
  91                         if (*cp++ != inter_name_termination)
  92                                 break;
  93
  94                         /* first pathname */
  95                         if (!line_termination) {
  96                                 read_line(&sb, stdin, line_termination);
  97                                 if (sb.eof)
  98                                         break;
  99                                 strcpy(old_path, sb.buf);
 100                         }
 101                         else if (!two_paths)
 102                                 strcpy(old_path, cp);
 103                         else {
 104                                 ep = strchr(cp, inter_name_termination);
 105                                 if (!ep)
 106                                         break;
 107                                 strncpy(old_path, cp, ep-cp);
 108                                 old_path[ep-cp] = 0;
 109                                 cp = ep + 1;
 110                         }
 111
 112                         /* second pathname */
 113                         if (!two_paths)
 114                                 strcpy(new_path, old_path);
 115                         else {
 116                                 if (!line_termination) {
 117                                         read_line(&sb, stdin,
 118                                                   line_termination);
 119                                         if (sb.eof)
 120                                                 break;
 121                                         strcpy(new_path, sb.buf);
 122                                 }
 123                                 else
 124                                         strcpy(new_path, cp);
 125                         }
 126                         diff_helper_input(old_mode, new_mode,
 127                                           old_sha1, new_sha1,
 128                                           old_path, status, score,
 129                                           new_path);
 130                         continue;
 131                 }
 132                 if (pickaxe)
 133                         diffcore_pickaxe(pickaxe, pickaxe_opts);
 134                 if (1 < ac)
 135                         diffcore_pathspec(av + 1);
 136                 diff_flush(DIFF_FORMAT_PATCH, 0);
 137                 printf("%s\n", sb.buf);
 138         }
 139         if (pickaxe)
 140                 diffcore_pickaxe(pickaxe, pickaxe_opts);
 141         if (1 < ac)
 142                 diffcore_pathspec(av + 1);
 143         diff_flush(DIFF_FORMAT_PATCH, 0);
 144         return 0;
 145 }