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, 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,
  48                                   struct diff_spec *old,
  49                                   struct diff_spec *new,
  50                                   char *path) {
  51         const char *cp = buf;
  52         int ch;
  53
  54         switch (*cp++) {
  55         case '+':
  56                 old->file_valid = 0;
  57                 return parse_oneside_change(cp, new, path);
  58         case '-':
  59                 new->file_valid = 0;
  60                 return parse_oneside_change(cp, old, path);
  61         case '*':
  62                 break;
  63         default:
  64                 return -1;
  65         }
  66
  67         /* This is for '*' entries */
  68         old->file_valid = old->sha1_valid = 1;
  69         new->file_valid = new->sha1_valid = 1;
  70
  71         old->mode = new->mode = 0;
  72         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  73                 old->mode = (old->mode << 3) | (ch - '0');
  74                 cp++;
  75         }
  76         if (strncmp(cp, "->", 2))
  77                 return -1;
  78         cp += 2;
  79         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  80                 new->mode = (new->mode << 3) | (ch - '0');
  81                 cp++;
  82         }
  83         if (strncmp(cp, "\tblob\t", 6))
  84                 return -1;
  85         cp += 6;
  86         if (get_sha1_hex(cp, old->u.sha1))
  87                 return -1;
  88         cp += 40;
  89         if (strncmp(cp, "->", 2))
  90                 return -1;
  91         cp += 2;
  92         if (get_sha1_hex(cp, new->u.sha1))
  93                 return -1;
  94         cp += 40;
  95         if (*cp++ != '\t')
  96                 return -1;
  97         strcpy(path, cp);
  98         return 0;
  99 }
 100
 101 static const char *diff_tree_helper_usage =
 102 "diff-tree-helper [-R] [-z] paths...";
 103
 104 int main(int ac, char **av) {
 105         struct strbuf sb;
 106         int reverse_diff = 0;
 107         int line_termination = '\n';
 108
 109         strbuf_init(&sb);
 110
 111         while (1 < ac && av[1][0] == '-') {
 112                 if (av[1][1] == 'R')
 113                         reverse_diff = 1;
 114                 else if (av[1][1] == 'z')
 115                         line_termination = 0;
 116                 else
 117                         usage(diff_tree_helper_usage);
 118                 ac--; av++;
 119         }
 120         /* the remaining parameters are paths patterns */
 121
 122         while (1) {
 123                 struct diff_spec old, new;
 124                 char path[PATH_MAX];
 125                 read_line(&sb, stdin, line_termination);
 126                 if (sb.eof)
 127                         break;
 128                 if (parse_diff_tree_output(sb.buf, &old, &new, path)) {
 129                         fprintf(stderr, "cannot parse %s\n", sb.buf);
 130                         continue;
 131                 }
 132                 if (1 < ac && !matches_pathspec(path, av+1, ac-1))
 133                         continue;
 134
 135                 run_external_diff(path, &old, &new);
 136         }
 137         return 0;
 138 }