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->blob_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                                   const char **spec, int cnt, int reverse)
  49 {
  50         struct diff_spec old, new;
  51         char path[PATH_MAX];
  52         const char *cp = buf;
  53         int ch;
  54
  55         switch (*cp++) {
  56         case 'U':
  57                 if (!cnt || matches_pathspec(cp + 1, spec, cnt))
  58                         diff_unmerge(cp + 1);
  59                 return 0;
  60         case '+':
  61                 old.file_valid = 0;
  62                 parse_oneside_change(cp, &new, path);
  63                 break;
  64         case '-':
  65                 new.file_valid = 0;
  66                 parse_oneside_change(cp, &old, path);
  67                 break;
  68         case '*':
  69                 old.file_valid = old.sha1_valid =
  70                         new.file_valid = new.sha1_valid = 1;
  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.blob_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.blob_sha1))
  93                         return -1;
  94                 cp += 40;
  95                 if (*cp++ != '\t')
  96                         return -1;
  97                 strcpy(path, cp);
  98                 break;
  99         default:
 100                 return -1;
 101         }
 102         if (!cnt || matches_pathspec(path, spec, cnt)) {
 103                 if (reverse)
 104                         run_external_diff(path, &new, &old);
 105                 else
 106                         run_external_diff(path, &old, &new);
 107         }
 108         return 0;
 109 }
 110
 111 static const char *diff_tree_helper_usage =
 112 "diff-tree-helper [-R] [-z] paths...";
 113
 114 int main(int ac, const char **av) {
 115         struct strbuf sb;
 116         int reverse = 0;
 117         int line_termination = '\n';
 118
 119         strbuf_init(&sb);
 120
 121         while (1 < ac && av[1][0] == '-') {
 122                 if (av[1][1] == 'R')
 123                         reverse = 1;
 124                 else if (av[1][1] == 'z')
 125                         line_termination = 0;
 126                 else
 127                         usage(diff_tree_helper_usage);
 128                 ac--; av++;
 129         }
 130         /* the remaining parameters are paths patterns */
 131
 132         while (1) {
 133                 int status;
 134                 read_line(&sb, stdin, line_termination);
 135                 if (sb.eof)
 136                         break;
 137                 status = parse_diff_tree_output(sb.buf, av+1, ac-1, reverse);
 138                 if (status)
 139                         fprintf(stderr, "cannot parse %s\n", sb.buf);
 140         }
 141         return 0;
 142 }