diff-tree-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 int matches_pathspec(const char *name, const char **spec, int cnt)
   9 {
  10         int i;
  11         int namelen = strlen(name);
  12         for (i = 0; i < cnt; i++) {
  13                 int speclen = strlen(spec[i]);
  14                 if (! strncmp(spec[i], name, speclen) &&
  15                     speclen <= namelen &&
  16                     (name[speclen] == 0 ||
  17                      name[speclen] == '/'))
  18                         return 1;
  19         }
  20         return 0;
  21 }
  22
  23 static int parse_oneside_change(const char *cp, struct diff_spec *one,
  24                                 char *path)
  25 {
  26         int ch;
  27
  28         one->file_valid = one->sha1_valid = 1;
  29         one->mode = 0;
  30         while ((ch = *cp) && '0' <= ch && ch <= '7') {
  31                 one->mode = (one->mode << 3) | (ch - '0');
  32                 cp++;
  33         }
  34
  35         if (strncmp(cp, "\tblob\t", 6))
  36                 return -1;
  37         cp += 6;
  38         if (get_sha1_hex(cp, one->u.sha1))
  39                 return -1;
  40         cp += 40;
  41         if (*cp++ != '\t')
  42                 return -1;
  43         strcpy(path, cp);
  44         return 0;
  45 }
  46
  47 static int parse_diff_tree_output(const char *buf, const char **spec, int cnt)
  48 {
  49         struct diff_spec old, new;
  50         char path[PATH_MAX];
  51         const char *cp = buf;
  52         int ch;
  53
  54         switch (*cp++) {
  55         case 'U':
  56                 if (!cnt || matches_pathspec(cp + 1, spec, cnt))
  57                         diff_unmerge(cp + 1);
  58                 return 0;
  59         case '+':
  60                 old.file_valid = 0;
  61                 parse_oneside_change(cp, &new, path);
  62                 break;
  63         case '-':
  64                 new.file_valid = 0;
  65                 parse_oneside_change(cp, &old, path);
  66                 break;
  67         case '*':
  68                 old.file_valid = old.sha1_valid =
  69                         new.file_valid = new.sha1_valid = 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 (strncmp(cp, "->", 2))
  76                         return -1;
  77                 cp += 2;
  78                 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  79                         new.mode = (new.mode << 3) | (ch - '0');
  80                         cp++;
  81                 }
  82                 if (strncmp(cp, "\tblob\t", 6))
  83                         return -1;
  84                 cp += 6;
  85                 if (get_sha1_hex(cp, old.u.sha1))
  86                         return -1;
  87                 cp += 40;
  88                 if (strncmp(cp, "->", 2))
  89                         return -1;
  90                 cp += 2;
  91                 if (get_sha1_hex(cp, new.u.sha1))
  92                         return -1;
  93                 cp += 40;
  94                 if (*cp++ != '\t')
  95                         return -1;
  96                 strcpy(path, cp);
  97                 break;
  98         default:
  99                 return -1;
 100         }
 101         if (!cnt || matches_pathspec(path, spec, cnt))
 102                 run_external_diff(path, &old, &new);
 103         return 0;
 104 }
 105
 106 static const char *diff_tree_helper_usage =
 107 "diff-tree-helper [-R] [-z] paths...";
 108
 109 int main(int ac, const char **av) {
 110         struct strbuf sb;
 111         int reverse_diff = 0;
 112         int line_termination = '\n';
 113
 114         strbuf_init(&sb);
 115
 116         while (1 < ac && av[1][0] == '-') {
 117                 if (av[1][1] == 'R')
 118                         reverse_diff = 1;
 119                 else if (av[1][1] == 'z')
 120                         line_termination = 0;
 121                 else
 122                         usage(diff_tree_helper_usage);
 123                 ac--; av++;
 124         }
 125         /* the remaining parameters are paths patterns */
 126
 127         while (1) {
 128                 int status;
 129                 read_line(&sb, stdin, line_termination);
 130                 if (sb.eof)
 131                         break;
 132                 status = parse_diff_tree_output(sb.buf, av+1, ac-1);
 133                 if (status)
 134                         fprintf(stderr, "cannot parse %s\n", sb.buf);
 135         }
 136         return 0;
 137 }