1#include "cache.h"
2#include "diff.h"
3static int cached_only = 0;
5static int diff_output_format = DIFF_FORMAT_RAW;
6static int diff_line_termination = '\n';
7static int match_nonexisting = 0;
8static int detect_rename = 0;
9static int find_copies_harder = 0;
10static int diff_setup_opt = 0;
11static int diff_score_opt = 0;
12static const char *pickaxe = NULL;
13static int pickaxe_opts = 0;
14static int diff_break_opt = -1;
15static const char *orderfile = NULL;
16static const char *diff_filter = NULL;
17/* A file entry went away or appeared */
19static void show_file(const char *prefix, struct cache_entry *ce, unsigned char *sha1, unsigned int mode)
20{
21 diff_addremove(prefix[0], ntohl(mode), sha1, ce->name, NULL);
22}
23static int get_stat_data(struct cache_entry *ce, unsigned char **sha1p, unsigned int *modep)
25{
26 unsigned char *sha1 = ce->sha1;
27 unsigned int mode = ce->ce_mode;
28 if (!cached_only) {
30 static unsigned char no_sha1[20];
31 int changed;
32 struct stat st;
33 if (lstat(ce->name, &st) < 0) {
34 if (errno == ENOENT && match_nonexisting) {
35 *sha1p = sha1;
36 *modep = mode;
37 return 0;
38 }
39 return -1;
40 }
41 changed = ce_match_stat(ce, &st);
42 if (changed) {
43 mode = create_ce_mode(st.st_mode);
44 sha1 = no_sha1;
45 }
46 }
47 *sha1p = sha1;
49 *modep = mode;
50 return 0;
51}
52static void show_new_file(struct cache_entry *new)
54{
55 unsigned char *sha1;
56 unsigned int mode;
57 /* New file in the index: it might actually be different in the working copy */
59 if (get_stat_data(new, &sha1, &mode) < 0)
60 return;
61 show_file("+", new, sha1, mode);
63}
64static int show_modified(struct cache_entry *old,
66 struct cache_entry *new,
67 int report_missing)
68{
69 unsigned int mode, oldmode;
70 unsigned char *sha1;
71 if (get_stat_data(new, &sha1, &mode) < 0) {
73 if (report_missing)
74 show_file("-", old, old->sha1, old->ce_mode);
75 return -1;
76 }
77 oldmode = old->ce_mode;
79 if (mode == oldmode && !memcmp(sha1, old->sha1, 20) &&
80 !find_copies_harder)
81 return 0;
82 mode = ntohl(mode);
84 oldmode = ntohl(oldmode);
85 diff_change(oldmode, mode,
87 old->sha1, sha1, old->name, NULL);
88 return 0;
89}
90static int diff_cache(struct cache_entry **ac, int entries, const char **pathspec)
92{
93 while (entries) {
94 struct cache_entry *ce = *ac;
95 int same = (entries > 1) && ce_same_name(ce, ac[1]);
96 if (!ce_path_match(ce, pathspec))
98 goto skip_entry;
99 switch (ce_stage(ce)) {
101 case 0:
102 /* No stage 1 entry? That means it's a new file */
103 if (!same) {
104 show_new_file(ce);
105 break;
106 }
107 /* Show difference between old and new */
108 show_modified(ac[1], ce, 1);
109 break;
110 case 1:
111 /* No stage 3 (merge) entry? That means it's been deleted */
112 if (!same) {
113 show_file("-", ce, ce->sha1, ce->ce_mode);
114 break;
115 }
116 /* We come here with ce pointing at stage 1
117 * (original tree) and ac[1] pointing at stage
118 * 3 (unmerged). show-modified with
119 * report-mising set to false does not say the
120 * file is deleted but reports true if work
121 * tree does not have it, in which case we
122 * fall through to report the unmerged state.
123 * Otherwise, we show the differences between
124 * the original tree and the work tree.
125 */
126 if (!cached_only && !show_modified(ce, ac[1], 0))
127 break;
128 /* fallthru */
129 case 3:
130 diff_unmerge(ce->name);
131 break;
132 default:
134 die("impossible cache entry stage");
135 }
136skip_entry:
138 /*
139 * Ignore all the different stages for this file,
140 * we've handled the relevant cases now.
141 */
142 do {
143 ac++;
144 entries--;
145 } while (entries && ce_same_name(ce, ac[0]));
146 }
147 return 0;
148}
149/*
151 * This turns all merge entries into "stage 3". That guarantees that
152 * when we read in the new tree (into "stage 1"), we won't lose sight
153 * of the fact that we had unmerged entries.
154 */
155static void mark_merge_entries(void)
156{
157 int i;
158 for (i = 0; i < active_nr; i++) {
159 struct cache_entry *ce = active_cache[i];
160 if (!ce_stage(ce))
161 continue;
162 ce->ce_flags |= htons(CE_STAGEMASK);
163 }
164}
165static char *diff_cache_usage =
167"git-diff-cache [-m] [--cached] "
168"[<common diff options>] <tree-ish> [<path>...]"
169COMMON_DIFF_OPTIONS_HELP;
170int main(int argc, const char **argv)
172{
173 const char *tree_name = NULL;
174 unsigned char sha1[20];
175 const char **pathspec = NULL;
176 void *tree;
177 unsigned long size;
178 int ret;
179 int allow_options = 1;
180 int i;
181 read_cache();
183 for (i = 1; i < argc; i++) {
184 const char *arg = argv[i];
185 if (!allow_options || *arg != '-') {
187 if (tree_name) {
188 pathspec = argv + i;
189 break;
190 }
191 tree_name = arg;
192 continue;
193 }
194
195 if (!strcmp(arg, "--")) {
196 allow_options = 0;
197 continue;
198 }
199 if (!strcmp(arg, "-r")) {
200 /* We accept the -r flag just to look like git-diff-tree */
201 continue;
202 }
203 /* We accept the -u flag as a synonym for "-p" */
204 if (!strcmp(arg, "-p") || !strcmp(arg, "-u")) {
205 diff_output_format = DIFF_FORMAT_PATCH;
206 continue;
207 }
208 if (!strncmp(arg, "-B", 2)) {
209 if ((diff_break_opt = diff_scoreopt_parse(arg)) == -1)
210 usage(diff_cache_usage);
211 continue;
212 }
213 if (!strncmp(arg, "-M", 2)) {
214 detect_rename = DIFF_DETECT_RENAME;
215 if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
216 usage(diff_cache_usage);
217 continue;
218 }
219 if (!strncmp(arg, "-C", 2)) {
220 detect_rename = DIFF_DETECT_COPY;
221 if ((diff_score_opt = diff_scoreopt_parse(arg)) == -1)
222 usage(diff_cache_usage);
223 continue;
224 }
225 if (!strcmp(arg, "--find-copies-harder")) {
226 find_copies_harder = 1;
227 continue;
228 }
229 if (!strcmp(arg, "-z")) {
230 diff_line_termination = 0;
231 continue;
232 }
233 if (!strcmp(arg, "--name-only")) {
234 diff_output_format = DIFF_FORMAT_NAME;
235 continue;
236 }
237 if (!strcmp(arg, "-R")) {
238 diff_setup_opt |= DIFF_SETUP_REVERSE;
239 continue;
240 }
241 if (!strncmp(arg, "-S", 2)) {
242 pickaxe = arg + 2;
243 continue;
244 }
245 if (!strncmp(arg, "--diff-filter=", 14)) {
246 diff_filter = arg + 14;
247 continue;
248 }
249 if (!strncmp(arg, "-O", 2)) {
250 orderfile = arg + 2;
251 continue;
252 }
253 if (!strcmp(arg, "--pickaxe-all")) {
254 pickaxe_opts = DIFF_PICKAXE_ALL;
255 continue;
256 }
257 if (!strcmp(arg, "-m")) {
258 match_nonexisting = 1;
259 continue;
260 }
261 if (!strcmp(arg, "--cached")) {
262 cached_only = 1;
263 continue;
264 }
265 usage(diff_cache_usage);
266 }
267 if (find_copies_harder && detect_rename != DIFF_DETECT_COPY)
269 usage(diff_cache_usage);
270 if (!tree_name || get_sha1(tree_name, sha1))
272 usage(diff_cache_usage);
273 /* The rest is for paths restriction. */
275 diff_setup(diff_setup_opt);
276 mark_merge_entries();
278 tree = read_object_with_reference(sha1, "tree", &size, NULL);
280 if (!tree)
281 die("bad tree object %s", tree_name);
282 if (read_tree(tree, size, 1, pathspec))
283 die("unable to read tree object %s", tree_name);
284 ret = diff_cache(active_cache, active_nr, pathspec);
286 diffcore_std(pathspec,
288 detect_rename, diff_score_opt,
289 pickaxe, pickaxe_opts,
290 diff_break_opt,
291 orderfile, diff_filter);
292 diff_flush(diff_output_format, diff_line_termination);
293 return ret;
294}