diff-stages.c

   1 /*
   2  * Copyright (c) 2005 Junio C Hamano
   3  */
   4
   5 #include "cache.h"
   6 #include "diff.h"
   7
   8 static struct diff_options diff_options;
   9
  10 static const char diff_stages_usage[] =
  11 "git-diff-stages [<common diff options>] <stage1> <stage2> [<path>...]"
  12 COMMON_DIFF_OPTIONS_HELP;
  13
  14 static void diff_stages(int stage1, int stage2, const char **pathspec)
  15 {
  16         int i = 0;
  17         while (i < active_nr) {
  18                 struct cache_entry *ce, *stages[4] = { NULL, };
  19                 struct cache_entry *one, *two;
  20                 const char *name;
  21                 int len, skip;
  22
  23                 ce = active_cache[i];
  24                 skip = !ce_path_match(ce, pathspec);
  25                 len = ce_namelen(ce);
  26                 name = ce->name;
  27                 for (;;) {
  28                         int stage = ce_stage(ce);
  29                         stages[stage] = ce;
  30                         if (active_nr <= ++i)
  31                                 break;
  32                         ce = active_cache[i];
  33                         if (ce_namelen(ce) != len ||
  34                             memcmp(name, ce->name, len))
  35                                 break;
  36                 }
  37                 one = stages[stage1];
  38                 two = stages[stage2];
  39
  40                 if (skip || (!one && !two))
  41                         continue;
  42                 if (!one)
  43                         diff_addremove(&diff_options, '+', ntohl(two->ce_mode),
  44                                        two->sha1, name, NULL);
  45                 else if (!two)
  46                         diff_addremove(&diff_options, '-', ntohl(one->ce_mode),
  47                                        one->sha1, name, NULL);
  48                 else if (memcmp(one->sha1, two->sha1, 20) ||
  49                          (one->ce_mode != two->ce_mode) ||
  50                          diff_options.find_copies_harder)
  51                         diff_change(&diff_options,
  52                                     ntohl(one->ce_mode), ntohl(two->ce_mode),
  53                                     one->sha1, two->sha1, name, NULL);
  54         }
  55 }
  56
  57 int main(int ac, const char **av)
  58 {
  59         int stage1, stage2;
  60         const char *prefix = setup_git_directory();
  61         const char **pathspec = NULL;
  62
  63         git_config(git_diff_config);
  64         read_cache();
  65         diff_setup(&diff_options);
  66         while (1 < ac && av[1][0] == '-') {
  67                 const char *arg = av[1];
  68                 if (!strcmp(arg, "-r"))
  69                         ; /* as usual */
  70                 else {
  71                         int diff_opt_cnt;
  72                         diff_opt_cnt = diff_opt_parse(&diff_options,
  73                                                       av+1, ac-1);
  74                         if (diff_opt_cnt < 0)
  75                                 usage(diff_stages_usage);
  76                         else if (diff_opt_cnt) {
  77                                 av += diff_opt_cnt;
  78                                 ac -= diff_opt_cnt;
  79                                 continue;
  80                         }
  81                         else
  82                                 usage(diff_stages_usage);
  83                 }
  84                 ac--; av++;
  85         }
  86
  87         if (ac < 3 ||
  88             sscanf(av[1], "%d", &stage1) != 1 ||
  89             ! (0 <= stage1 && stage1 <= 3) ||
  90             sscanf(av[2], "%d", &stage2) != 1 ||
  91             ! (0 <= stage2 && stage2 <= 3))
  92                 usage(diff_stages_usage);
  93
  94         av += 3; /* The rest from av[0] are for paths restriction. */
  95         pathspec = get_pathspec(prefix, av);
  96
  97         if (diff_setup_done(&diff_options) < 0)
  98                 usage(diff_stages_usage);
  99
 100         diff_stages(stage1, stage2, pathspec);
 101         diffcore_std(&diff_options);
 102         diff_flush(&diff_options);
 103         return 0;
 104 }