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 #include "diffcore.h" /* just for MAX_SCORE */
   8
   9 static const char *pickaxe = NULL;
  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
  28                         usage(diff_helper_usage);
  29                 ac--; av++;
  30         }
  31         /* the remaining parameters are paths patterns */
  32
  33         diff_setup(0);
  34         while (1) {
  35                 unsigned old_mode, new_mode;
  36                 unsigned char old_sha1[20], new_sha1[20];
  37                 char old_path[PATH_MAX];
  38                 int status, score, two_paths;
  39                 char new_path[PATH_MAX];
  40
  41                 int ch;
  42                 char *cp, *ep;
  43
  44                 read_line(&sb, stdin, line_termination);
  45                 if (sb.eof)
  46                         break;
  47                 switch (sb.buf[0]) {
  48                 case ':':
  49                         /* parse the first part up to the status */
  50                         cp = sb.buf + 1;
  51                         old_mode = new_mode = 0;
  52                         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  53                                 old_mode = (old_mode << 3) | (ch - '0');
  54                                 cp++;
  55                         }
  56                         if (*cp++ != ' ')
  57                                 break;
  58                         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  59                                 new_mode = (new_mode << 3) | (ch - '0');
  60                                 cp++;
  61                         }
  62                         if (*cp++ != ' ')
  63                                 break;
  64                         if (get_sha1_hex(cp, old_sha1))
  65                                 break;
  66                         cp += 40;
  67                         if (*cp++ != ' ')
  68                                 break;
  69                         if (get_sha1_hex(cp, new_sha1))
  70                                 break;
  71                         cp += 40;
  72                         if (*cp++ != ' ')
  73                                 break;
  74                         status = *cp++;
  75                         if (!strchr("MCRNDU", status))
  76                                 break;
  77                         two_paths = score = 0;
  78                         if (status == 'R' || status == 'C') {
  79                                 two_paths = 1;
  80                                 sscanf(cp, "%d", &score);
  81                                 score = score * MAX_SCORE / 100;
  82                                 if (line_termination) {
  83                                         cp = strchr(cp,
  84                                                     inter_name_termination);
  85                                         if (!cp)
  86                                                 break;
  87                                 }
  88                         }
  89
  90                         if (*cp++ != inter_name_termination)
  91                                 break;
  92
  93                         /* first pathname */
  94                         if (!line_termination) {
  95                                 read_line(&sb, stdin, line_termination);
  96                                 if (sb.eof)
  97                                         break;
  98                                 strcpy(old_path, sb.buf);
  99                         }
 100                         else if (!two_paths)
 101                                 strcpy(old_path, cp);
 102                         else {
 103                                 ep = strchr(cp, inter_name_termination);
 104                                 if (!ep)
 105                                         break;
 106                                 strncpy(old_path, cp, ep-cp);
 107                                 old_path[ep-cp] = 0;
 108                                 cp = ep + 1;
 109                         }
 110
 111                         /* second pathname */
 112                         if (!two_paths)
 113                                 strcpy(new_path, old_path);
 114                         else {
 115                                 if (!line_termination) {
 116                                         read_line(&sb, stdin,
 117                                                   line_termination);
 118                                         if (sb.eof)
 119                                                 break;
 120                                         strcpy(new_path, sb.buf);
 121                                 }
 122                                 else
 123                                         strcpy(new_path, cp);
 124                         }
 125                         diff_helper_input(old_mode, new_mode,
 126                                           old_sha1, new_sha1,
 127                                           old_path, status, score,
 128                                           new_path);
 129                         continue;
 130                 }
 131                 if (pickaxe)
 132                         diffcore_pickaxe(pickaxe);
 133                 if (1 < ac)
 134                         diffcore_pathspec(av + 1);
 135                 diff_flush(DIFF_FORMAT_PATCH, 0);
 136                 printf("%s\n", sb.buf);
 137         }
 138         if (pickaxe)
 139                 diffcore_pickaxe(pickaxe);
 140         if (1 < ac)
 141                 diffcore_pathspec(av + 1);
 142         diff_flush(DIFF_FORMAT_PATCH, 0);
 143         return 0;
 144 }