diff-helper.c

   1 /*
   2  * Copyright (C) 2005 Junio C Hamano
   3  */
   4 #include <limits.h>
   5 #include "cache.h"
   6 #include "strbuf.h"
   7 #include "diff.h"
   8
   9 static int detect_rename = 0;
  10 static int diff_score_opt = 0;
  11 static int generate_patch = 1;
  12 static const char *pickaxe = NULL;
  13
  14 static int parse_oneside_change(const char *cp, int *mode,
  15                                 unsigned char *sha1, char *path)
  16 {
  17         int ch, m;
  18
  19         m = 0;
  20         while ((ch = *cp) && '0' <= ch && ch <= '7') {
  21                 m = (m << 3) | (ch - '0');
  22                 cp++;
  23         }
  24         *mode = m;
  25         if (strncmp(cp, "\tblob\t", 6) && strncmp(cp, " blob ", 6) &&
  26             strncmp(cp, "\ttree\t", 6) && strncmp(cp, " tree ", 6))
  27                 return -1;
  28         cp += 6;
  29         if (get_sha1_hex(cp, sha1))
  30                 return -1;
  31         cp += 40;
  32         if ((*cp != '\t') && *cp != ' ')
  33                 return -1;
  34         strcpy(path, ++cp);
  35         return 0;
  36 }
  37
  38 static int parse_diff_raw_output(const char *buf)
  39 {
  40         char path[PATH_MAX];
  41         unsigned char old_sha1[20], new_sha1[20];
  42         const char *cp = buf;
  43         int ch, old_mode, new_mode;
  44
  45         switch (*cp++) {
  46         case 'U':
  47                 diff_unmerge(cp + 1);
  48                 break;
  49         case '+':
  50                 if (parse_oneside_change(cp, &new_mode, new_sha1, path))
  51                         return -1;
  52                 diff_addremove('+', new_mode, new_sha1, path, NULL);
  53                 break;
  54         case '-':
  55                 if (parse_oneside_change(cp, &old_mode, old_sha1, path))
  56                         return -1;
  57                 diff_addremove('-', old_mode, old_sha1, path, NULL);
  58                 break;
  59         case '*':
  60                 old_mode = new_mode = 0;
  61                 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  62                         old_mode = (old_mode << 3) | (ch - '0');
  63                         cp++;
  64                 }
  65                 if (strncmp(cp, "->", 2))
  66                         return -1;
  67                 cp += 2;
  68                 while ((ch = *cp) && ('0' <= ch && ch <= '7')) {
  69                         new_mode = (new_mode << 3) | (ch - '0');
  70                         cp++;
  71                 }
  72                 if (strncmp(cp, "\tblob\t", 6) && strncmp(cp, " blob ", 6) &&
  73                     strncmp(cp, "\ttree\t", 6) && strncmp(cp, " tree ", 6))
  74                         return -1;
  75                 cp += 6;
  76                 if (get_sha1_hex(cp, old_sha1))
  77                         return -1;
  78                 cp += 40;
  79                 if (strncmp(cp, "->", 2))
  80                         return -1;
  81                 cp += 2;
  82                 if (get_sha1_hex(cp, new_sha1))
  83                         return -1;
  84                 cp += 40;
  85                 if ((*cp != '\t') && *cp != ' ')
  86                         return -1;
  87                 strcpy(path, ++cp);
  88                 diff_change(old_mode, new_mode, old_sha1, new_sha1, path, NULL);
  89                 break;
  90         default:
  91                 return -1;
  92         }
  93         return 0;
  94 }
  95
  96 static const char *diff_helper_usage =
  97         "git-diff-helper [-z] [-R] [-M] [-C] [-S<string>] paths...";
  98
  99 int main(int ac, const char **av) {
 100         struct strbuf sb;
 101         int reverse = 0;
 102         int line_termination = '\n';
 103
 104         strbuf_init(&sb);
 105
 106         while (1 < ac && av[1][0] == '-') {
 107                 if (av[1][1] == 'R')
 108                         reverse = 1;
 109                 else if (av[1][1] == 'z')
 110                         line_termination = 0;
 111                 else if (av[1][1] == 'p') /* hidden from the help */
 112                         generate_patch = 0;
 113                 else if (av[1][1] == 'M') {
 114                         detect_rename = 1;
 115                         diff_score_opt = diff_scoreopt_parse(av[1]);
 116                 }
 117                 else if (av[1][1] == 'C') {
 118                         detect_rename = 2;
 119                         diff_score_opt = diff_scoreopt_parse(av[1]);
 120                 }
 121                 else if (av[1][1] == 'S') {
 122                         pickaxe = av[1] + 2;
 123                 }
 124                 else
 125                         usage(diff_helper_usage);
 126                 ac--; av++;
 127         }
 128         /* the remaining parameters are paths patterns */
 129
 130         diff_setup(detect_rename, diff_score_opt, pickaxe,
 131                    reverse, (generate_patch ? -1 : line_termination),
 132                    av+1, ac-1);
 133
 134         while (1) {
 135                 int status;
 136                 read_line(&sb, stdin, line_termination);
 137                 if (sb.eof)
 138                         break;
 139                 status = parse_diff_raw_output(sb.buf);
 140                 if (status) {
 141                         diff_flush();
 142                         printf("%s%c", sb.buf, line_termination);
 143                 }
 144         }
 145
 146         diff_flush();
 147         return 0;
 148 }