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/*
* Copyright (c) 2005 Junio C Hamano
*/
#include "cache.h"
#include "diff.h"
static struct diff_options diff_options;
static const char diff_stages_usage[] =
"git-diff-stages [<common diff options>] <stage1> <stage2> [<path>...]"
COMMON_DIFF_OPTIONS_HELP;
static void diff_stages(int stage1, int stage2, const char **pathspec)
{
int i = 0;
while (i < active_nr) {
struct cache_entry *ce, *stages[4] = { NULL, };
struct cache_entry *one, *two;
const char *name;
int len, skip;
ce = active_cache[i];
skip = !ce_path_match(ce, pathspec);
len = ce_namelen(ce);
name = ce->name;
for (;;) {
int stage = ce_stage(ce);
stages[stage] = ce;
if (active_nr <= ++i)
break;
ce = active_cache[i];
if (ce_namelen(ce) != len ||
memcmp(name, ce->name, len))
break;
}
one = stages[stage1];
two = stages[stage2];
if (skip || (!one && !two))
continue;
if (!one)
diff_addremove(&diff_options, '+', ntohl(two->ce_mode),
two->sha1, name, NULL);
else if (!two)
diff_addremove(&diff_options, '-', ntohl(one->ce_mode),
one->sha1, name, NULL);
else if (memcmp(one->sha1, two->sha1, 20) ||
(one->ce_mode != two->ce_mode) ||
diff_options.find_copies_harder)
diff_change(&diff_options,
ntohl(one->ce_mode), ntohl(two->ce_mode),
one->sha1, two->sha1, name, NULL);
}
}
int main(int ac, const char **av)
{
int stage1, stage2;
const char *prefix = setup_git_directory();
const char **pathspec = NULL;
git_config(git_diff_config);
read_cache();
diff_setup(&diff_options);
while (1 < ac && av[1][0] == '-') {
const char *arg = av[1];
if (!strcmp(arg, "-r"))
; /* as usual */
else {
int diff_opt_cnt;
diff_opt_cnt = diff_opt_parse(&diff_options,
av+1, ac-1);
if (diff_opt_cnt < 0)
usage(diff_stages_usage);
else if (diff_opt_cnt) {
av += diff_opt_cnt;
ac -= diff_opt_cnt;
continue;
}
else
usage(diff_stages_usage);
}
ac--; av++;
}
if (ac < 3 ||
sscanf(av[1], "%d", &stage1) != 1 ||
! (0 <= stage1 && stage1 <= 3) ||
sscanf(av[2], "%d", &stage2) != 1 ||
! (0 <= stage2 && stage2 <= 3))
usage(diff_stages_usage);
av += 3; /* The rest from av[0] are for paths restriction. */
pathspec = get_pathspec(prefix, av);
if (diff_setup_done(&diff_options) < 0)
usage(diff_stages_usage);
diff_stages(stage1, stage2, pathspec);
diffcore_std(&diff_options);
diff_flush(&diff_options);
return 0;
}
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