summaryrefslogtreecommitdiff
path: root/diff-files.c
blob: c96ad35fb6cdb74494d1fdd93e1f125412ee024c (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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.h"
#include "diff.h"
 
static const char diff_files_usage[] =
"git-diff-files [-q] [-0/-1/2/3 |-c|--cc] [<common diff options>] [<path>...]"
COMMON_DIFF_OPTIONS_HELP;
 
static struct diff_options diff_options;
static int silent = 0;
static int diff_unmerged_stage = 2;
static int combine_merges = 0;
static int dense_combined_merges = 0;
 
static void show_unmerge(const char *path)
{
	diff_unmerge(&diff_options, path);
}
 
static void show_file(int pfx, struct cache_entry *ce)
{
	diff_addremove(&diff_options, pfx, ntohl(ce->ce_mode),
		       ce->sha1, ce->name, NULL);
}
 
static void show_modified(int oldmode, int mode,
			  const unsigned char *old_sha1, const unsigned char *sha1,
			  char *path)
{
	diff_change(&diff_options, oldmode, mode, old_sha1, sha1, path, NULL);
}
 
int main(int argc, const char **argv)
{
	const char **pathspec;
	const char *prefix = setup_git_directory();
	int entries, i;
 
	git_config(git_diff_config);
	diff_setup(&diff_options);
	while (1 < argc && argv[1][0] == '-') {
		if (!strcmp(argv[1], "--")) {
			argv++;
			argc--;
			break;
		}
		if (!strcmp(argv[1], "-0"))
			diff_unmerged_stage = 0;
		else if (!strcmp(argv[1], "-1"))
			diff_unmerged_stage = 1;
		else if (!strcmp(argv[1], "-2"))
			diff_unmerged_stage = 2;
		else if (!strcmp(argv[1], "-3"))
			diff_unmerged_stage = 3;
		else if (!strcmp(argv[1], "--base"))
			diff_unmerged_stage = 1;
		else if (!strcmp(argv[1], "--ours"))
			diff_unmerged_stage = 2;
		else if (!strcmp(argv[1], "--theirs"))
			diff_unmerged_stage = 3;
		else if (!strcmp(argv[1], "-q"))
			silent = 1;
		else if (!strcmp(argv[1], "-r"))
			; /* no-op */
		else if (!strcmp(argv[1], "-s"))
			; /* no-op */
		else if (!strcmp(argv[1], "-c"))
			combine_merges = 1;
		else if (!strcmp(argv[1], "--cc"))
			dense_combined_merges = combine_merges = 1;
		else {
			int diff_opt_cnt;
			diff_opt_cnt = diff_opt_parse(&diff_options,
						      argv+1, argc-1);
			if (diff_opt_cnt < 0)
				usage(diff_files_usage);
			else if (diff_opt_cnt) {
				argv += diff_opt_cnt;
				argc -= diff_opt_cnt;
				continue;
			}
			else
				usage(diff_files_usage);
		}
		argv++; argc--;
	}
	if (combine_merges) {
		diff_options.output_format = DIFF_FORMAT_PATCH;
	}
 
	/* Find the directory, and set up the pathspec */
	pathspec = get_pathspec(prefix, argv + 1);
	entries = read_cache();
 
	if (diff_setup_done(&diff_options) < 0)
		usage(diff_files_usage);
 
	/* At this point, if argc == 1, then we are doing everything.
	 * Otherwise argv[1] .. argv[argc-1] have the explicit paths.
	 */
	if (entries < 0) {
		perror("read_cache");
		exit(1);
	}
 
	for (i = 0; i < entries; i++) {
		struct stat st;
		unsigned int oldmode, newmode;
		struct cache_entry *ce = active_cache[i];
		int changed;
 
		if (!ce_path_match(ce, pathspec))
			continue;
 
		if (ce_stage(ce)) {
			struct {
				struct combine_diff_path p;
				struct combine_diff_parent filler[5];
			} combine;
			int num_compare_stages = 0;
 
			combine.p.next = NULL;
			combine.p.len = ce_namelen(ce);
			combine.p.path = xmalloc(combine.p.len + 1);
			memcpy(combine.p.path, ce->name, combine.p.len);
			combine.p.path[combine.p.len] = 0;
			combine.p.mode = 0;
			memset(combine.p.sha1, 0, 20);
			memset(&combine.p.parent[0], 0,
			       sizeof(combine.filler));
 
			while (i < entries) {
				struct cache_entry *nce = active_cache[i];
				int stage;
 
				if (strcmp(ce->name, nce->name))
					break;
 
				/* Stage #2 (ours) is the first parent,
				 * stage #3 (theirs) is the second.
				 */
				stage = ce_stage(nce);
				if (2 <= stage) {
					int mode = ntohl(nce->ce_mode);
					num_compare_stages++;
					memcpy(combine.p.parent[stage-2].sha1,
					       nce->sha1, 20);
					combine.p.parent[stage-2].mode =
						DIFF_FILE_CANON_MODE(mode);
				}
 
				/* diff against the proper unmerged stage */
				if (stage == diff_unmerged_stage)
					ce = nce;
				i++;
			}
			/*
			 * Compensate for loop update
			 */
			i--;
 
			if (combine_merges && num_compare_stages == 2) {
				show_combined_diff(&combine.p, 2,
						   dense_combined_merges,
						   NULL);
				free(combine.p.path);
				continue;
			}
			free(combine.p.path);
 
			/*
			 * Show the diff for the 'ce' if we found the one
			 * from the desired stage.
			 */
			show_unmerge(ce->name);
			if (ce_stage(ce) != diff_unmerged_stage)
				continue;
		}
 
		if (lstat(ce->name, &st) < 0) {
			if (errno != ENOENT && errno != ENOTDIR) {
				perror(ce->name);
				continue;
			}
			if (silent)
				continue;
			show_file('-', ce);
			continue;
		}
		changed = ce_match_stat(ce, &st, 0);
		if (!changed && !diff_options.find_copies_harder)
			continue;
		oldmode = ntohl(ce->ce_mode);
 
		newmode = DIFF_FILE_CANON_MODE(st.st_mode);
		if (!trust_executable_bit &&
		    S_ISREG(newmode) && S_ISREG(oldmode) &&
		    ((newmode ^ oldmode) == 0111))
			newmode = oldmode;
		show_modified(oldmode, newmode,
			      ce->sha1, (changed ? null_sha1 : ce->sha1),
			      ce->name);
	}
	diffcore_std(&diff_options);
	diff_flush(&diff_options);
	return 0;
}