summaryrefslogtreecommitdiff
path: root/builtin-diff-tree.c
blob: 3409a39a9f73f9ed67547f5cc79619c1e402f47b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
#include "cache.h"
#include "diff.h"
#include "commit.h"
#include "log-tree.h"
#include "builtin.h"
 
static struct rev_info log_tree_opt;
 
static int diff_tree_commit_sha1(const unsigned char *sha1)
{
	struct commit *commit = lookup_commit_reference(sha1);
	if (!commit)
		return -1;
	return log_tree_commit(&log_tree_opt, commit);
}
 
static int diff_tree_stdin(char *line)
{
	int len = strlen(line);
	unsigned char sha1[20];
	struct commit *commit;
 
	if (!len || line[len-1] != '\n')
		return -1;
	line[len-1] = 0;
	if (get_sha1_hex(line, sha1))
		return -1;
	commit = lookup_commit(sha1);
	if (!commit || parse_commit(commit))
		return -1;
	if (isspace(line[40]) && !get_sha1_hex(line+41, sha1)) {
		/* Graft the fake parents locally to the commit */
		int pos = 41;
		struct commit_list **pptr, *parents;
 
		/* Free the real parent list */
		for (parents = commit->parents; parents; ) {
			struct commit_list *tmp = parents->next;
			free(parents);
			parents = tmp;
		}
		commit->parents = NULL;
		pptr = &(commit->parents);
		while (line[pos] && !get_sha1_hex(line + pos, sha1)) {
			struct commit *parent = lookup_commit(sha1);
			if (parent) {
				pptr = &commit_list_insert(parent, pptr)->next;
			}
			pos += 41;
		}
	}
	return log_tree_commit(&log_tree_opt, commit);
}
 
static const char diff_tree_usage[] =
"git-diff-tree [--stdin] [-m] [-c] [--cc] [-s] [-v] [--pretty] [-t] [-r] [--root] "
"[<common diff options>] <tree-ish> [<tree-ish>] [<path>...]\n"
"  -r            diff recursively\n"
"  --root        include the initial commit as diff against /dev/null\n"
COMMON_DIFF_OPTIONS_HELP;
 
int cmd_diff_tree(int argc, const char **argv, char **envp)
{
	int nr_sha1;
	char line[1000];
	struct object *tree1, *tree2;
	static struct rev_info *opt = &log_tree_opt;
	int read_stdin = 0;
 
	git_config(git_diff_config);
	nr_sha1 = 0;
	init_revisions(opt);
	opt->abbrev = 0;
	opt->diff = 1;
	argc = setup_revisions(argc, argv, opt, NULL);
 
	while (--argc > 0) {
		const char *arg = *++argv;
 
		if (!strcmp(arg, "--stdin")) {
			read_stdin = 1;
			continue;
		}
		usage(diff_tree_usage);
	}
 
	/*
	 * NOTE! We expect "a ^b" to be equal to "a..b", so we
	 * reverse the order of the objects if the second one
	 * is marked UNINTERESTING.
	 */
	nr_sha1 = opt->pending.nr;
	switch (nr_sha1) {
	case 0:
		if (!read_stdin)
			usage(diff_tree_usage);
		break;
	case 1:
		tree1 = opt->pending.objects[0].item;
		diff_tree_commit_sha1(tree1->sha1);
		break;
	case 2:
		tree1 = opt->pending.objects[0].item;
		tree2 = opt->pending.objects[1].item;
		if (tree2->flags & UNINTERESTING) {
			struct object *tmp = tree2;
			tree2 = tree1;
			tree1 = tmp;
		}
		diff_tree_sha1(tree1->sha1,
			       tree2->sha1,
			       "", &opt->diffopt);
		log_tree_diff_flush(opt);
		break;
	}
 
	if (!read_stdin)
		return 0;
 
	if (opt->diffopt.detect_rename)
		opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
				       DIFF_SETUP_USE_CACHE);
	while (fgets(line, sizeof(line), stdin)) {
		unsigned char sha1[20];
 
		if (get_sha1_hex(line, sha1)) {
			fputs(line, stdout);
			fflush(stdout);
		}
		else
			diff_tree_stdin(line);
	}
	return 0;
}