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 #define PLEASE_WARN -1
  48 #define WARNED_OURSELVES -2
  49
  50 static int parse_diff_tree_output(const char *buf,
  51                                   struct diff_spec *old,
  52                                   struct diff_spec *new,
  53                                   char *path) {
  54         const char *cp = buf;
  55         int ch;
  56
  57         switch (*cp++) {
  58         case 'U':
  59                 diff_unmerge(cp + 1);
  60                 return WARNED_OURSELVES;
  61         case '+':
  62                 old->file_valid = 0;
  63                 return parse_oneside_change(cp, new, path);
  64         case '-':
  65                 new->file_valid = 0;
  66                 return parse_oneside_change(cp, old, path);
  67         case '*':
  68                 break;
  69         default:
  70                 return PLEASE_WARN;
  71         }
  72
  73         /* This is for '*' entries */
  74         old->file_valid = old->sha1_valid = 1;
  75         new->file_valid = new->sha1_valid = 1;
  76
  77         old->mode = new->mode = 0;
  78         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  79                 old->mode = (old->mode << 3) | (ch - '0');
  80                 cp++;
  81         }
  82         if (strncmp(cp, "->", 2))
  83                 return PLEASE_WARN;
  84         cp += 2;
  85         while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  86                 new->mode = (new->mode << 3) | (ch - '0');
  87                 cp++;
  88         }
  89         if (strncmp(cp, "\tblob\t", 6))
  90                 return PLEASE_WARN;
  91         cp += 6;
  92         if (get_sha1_hex(cp, old->u.sha1))
  93                 return PLEASE_WARN;
  94         cp += 40;
  95         if (strncmp(cp, "->", 2))
  96                 return PLEASE_WARN;
  97         cp += 2;
  98         if (get_sha1_hex(cp, new->u.sha1))
  99                 return PLEASE_WARN;
 100         cp += 40;
 101         if (*cp++ != '\t')
 102                 return PLEASE_WARN;
 103         strcpy(path, cp);
 104         return 0;
 105 }
 106
 107 static const char *diff_tree_helper_usage =
 108 "diff-tree-helper [-R] [-z] paths...";
 109
 110 int main(int ac, char **av) {
 111         struct strbuf sb;
 112         int reverse_diff = 0;
 113         int line_termination = '\n';
 114
 115         strbuf_init(&sb);
 116
 117         while (1 < ac && av[1][0] == '-') {
 118                 if (av[1][1] == 'R')
 119                         reverse_diff = 1;
 120                 else if (av[1][1] == 'z')
 121                         line_termination = 0;
 122                 else
 123                         usage(diff_tree_helper_usage);
 124                 ac--; av++;
 125         }
 126         /* the remaining parameters are paths patterns */
 127
 128         while (1) {
 129                 int status;
 130                 struct diff_spec old, new;
 131                 char path[PATH_MAX];
 132                 read_line(&sb, stdin, line_termination);
 133                 if (sb.eof)
 134                         break;
 135                 status = parse_diff_tree_output(sb.buf, &old, &new, path);
 136                 if (status) {
 137                         if (status == PLEASE_WARN)
 138                                 fprintf(stderr, "cannot parse %s\n", sb.buf);
 139                         continue;
 140                 }
 141                 if (1 < ac && !matches_pathspec(path, av+1, ac-1))
 142                         continue;
 143
 144                 run_external_diff(path, &old, &new);
 145         }
 146         return 0;
 147 }