aboutsummaryrefslogtreecommitdiff
path: root/builtin/diff-tree.c
blob: 2a12b81e065bfb75f05baf6694e1a9d53129bc40 (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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
#include "cache.h"
#include "diff.h"
#include "commit.h"
#include "log-tree.h"
#include "builtin.h"
#include "submodule.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);
}

/* Diff one or more commits. */
static int stdin_diff_commit(struct commit *commit, char *line, int len)
{
	unsigned char sha1[20];
	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;

		/* Free the real parent list */
		free_commit_list(commit->parents);
		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);
}

/* Diff two trees. */
static int stdin_diff_trees(struct tree *tree1, char *line, int len)
{
	unsigned char sha1[20];
	struct tree *tree2;
	if (len != 82 || !isspace(line[40]) || get_sha1_hex(line + 41, sha1))
		return error("Need exactly two trees, separated by a space");
	tree2 = lookup_tree(sha1);
	if (!tree2 || parse_tree(tree2))
		return -1;
	printf("%s %s\n", oid_to_hex(&tree1->object.oid),
			  oid_to_hex(&tree2->object.oid));
	diff_tree_sha1(tree1->object.oid.hash, tree2->object.oid.hash,
		       "", &log_tree_opt.diffopt);
	log_tree_diff_flush(&log_tree_opt);
	return 0;
}

static int diff_tree_stdin(char *line)
{
	int len = strlen(line);
	unsigned char sha1[20];
	struct object *obj;

	if (!len || line[len-1] != '\n')
		return -1;
	line[len-1] = 0;
	if (get_sha1_hex(line, sha1))
		return -1;
	obj = parse_object(sha1);
	if (!obj)
		return -1;
	if (obj->type == OBJ_COMMIT)
		return stdin_diff_commit((struct commit *)obj, line, len);
	if (obj->type == OBJ_TREE)
		return stdin_diff_trees((struct tree *)obj, line, len);
	error("Object %s is a %s, not a commit or tree",
	      sha1_to_hex(sha1), typename(obj->type));
	return -1;
}

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;

static void diff_tree_tweak_rev(struct rev_info *rev, struct setup_revision_opt *opt)
{
	if (!rev->diffopt.output_format) {
		if (rev->dense_combined_merges)
			rev->diffopt.output_format = DIFF_FORMAT_PATCH;
		else
			rev->diffopt.output_format = DIFF_FORMAT_RAW;
	}
}

int cmd_diff_tree(int argc, const char **argv, const char *prefix)
{
	int nr_sha1;
	char line[1000];
	struct object *tree1, *tree2;
	static struct rev_info *opt = &log_tree_opt;
	struct setup_revision_opt s_r_opt;
	int read_stdin = 0;

	init_revisions(opt, prefix);
	gitmodules_config();
	git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
	opt->abbrev = 0;
	opt->diff = 1;
	opt->disable_stdin = 1;
	memset(&s_r_opt, 0, sizeof(s_r_opt));
	s_r_opt.tweak = diff_tree_tweak_rev;
	argc = setup_revisions(argc, argv, opt, &s_r_opt);

	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->oid.hash);
		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->oid.hash,
			       tree2->oid.hash,
			       "", &opt->diffopt);
		log_tree_diff_flush(opt);
		break;
	}

	if (read_stdin) {
		int saved_nrl = 0;
		int saved_dcctc = 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);
				if (saved_nrl < opt->diffopt.needed_rename_limit)
					saved_nrl = opt->diffopt.needed_rename_limit;
				if (opt->diffopt.degraded_cc_to_c)
					saved_dcctc = 1;
			}
		}
		opt->diffopt.degraded_cc_to_c = saved_dcctc;
		opt->diffopt.needed_rename_limit = saved_nrl;
	}

	return diff_result_code(&opt->diffopt, 0);
}