Andrew's git - gitweb.git/blob

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