Merge branch 'jt/http-redact-cookies' into maint
[git.git] / diff-no-index.c
blob0ed5f0f496882cef9e04f9a93fe718a9f55a268a
1 /*
2 * "diff --no-index" support
3 * Copyright (c) 2007 by Johannes Schindelin
4 * Copyright (c) 2008 by Junio C Hamano
5 */
7 #include "cache.h"
8 #include "color.h"
9 #include "commit.h"
10 #include "blob.h"
11 #include "tag.h"
12 #include "diff.h"
13 #include "diffcore.h"
14 #include "revision.h"
15 #include "log-tree.h"
16 #include "builtin.h"
17 #include "string-list.h"
18 #include "dir.h"
20 static int read_directory_contents(const char *path, struct string_list *list)
22 DIR *dir;
23 struct dirent *e;
25 if (!(dir = opendir(path)))
26 return error("Could not open directory %s", path);
28 while ((e = readdir(dir)))
29 if (!is_dot_or_dotdot(e->d_name))
30 string_list_insert(list, e->d_name);
32 closedir(dir);
33 return 0;
37 * This should be "(standard input)" or something, but it will
38 * probably expose many more breakages in the way no-index code
39 * is bolted onto the diff callchain.
41 static const char file_from_standard_input[] = "-";
43 static int get_mode(const char *path, int *mode)
45 struct stat st;
47 if (!path || !strcmp(path, "/dev/null"))
48 *mode = 0;
49 #ifdef GIT_WINDOWS_NATIVE
50 else if (!strcasecmp(path, "nul"))
51 *mode = 0;
52 #endif
53 else if (path == file_from_standard_input)
54 *mode = create_ce_mode(0666);
55 else if (lstat(path, &st))
56 return error("Could not access '%s'", path);
57 else
58 *mode = st.st_mode;
59 return 0;
62 static int populate_from_stdin(struct diff_filespec *s)
64 struct strbuf buf = STRBUF_INIT;
65 size_t size = 0;
67 if (strbuf_read(&buf, 0, 0) < 0)
68 return error_errno("error while reading from stdin");
70 s->should_munmap = 0;
71 s->data = strbuf_detach(&buf, &size);
72 s->size = size;
73 s->should_free = 1;
74 s->is_stdin = 1;
75 return 0;
78 static struct diff_filespec *noindex_filespec(const char *name, int mode)
80 struct diff_filespec *s;
82 if (!name)
83 name = "/dev/null";
84 s = alloc_filespec(name);
85 fill_filespec(s, &null_oid, 0, mode);
86 if (name == file_from_standard_input)
87 populate_from_stdin(s);
88 return s;
91 static int queue_diff(struct diff_options *o,
92 const char *name1, const char *name2)
94 int mode1 = 0, mode2 = 0;
96 if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
97 return -1;
99 if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) {
100 struct diff_filespec *d1, *d2;
102 if (S_ISDIR(mode1)) {
103 /* 2 is file that is created */
104 d1 = noindex_filespec(NULL, 0);
105 d2 = noindex_filespec(name2, mode2);
106 name2 = NULL;
107 mode2 = 0;
108 } else {
109 /* 1 is file that is deleted */
110 d1 = noindex_filespec(name1, mode1);
111 d2 = noindex_filespec(NULL, 0);
112 name1 = NULL;
113 mode1 = 0;
115 /* emit that file */
116 diff_queue(&diff_queued_diff, d1, d2);
118 /* and then let the entire directory be created or deleted */
121 if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
122 struct strbuf buffer1 = STRBUF_INIT;
123 struct strbuf buffer2 = STRBUF_INIT;
124 struct string_list p1 = STRING_LIST_INIT_DUP;
125 struct string_list p2 = STRING_LIST_INIT_DUP;
126 int i1, i2, ret = 0;
127 size_t len1 = 0, len2 = 0;
129 if (name1 && read_directory_contents(name1, &p1))
130 return -1;
131 if (name2 && read_directory_contents(name2, &p2)) {
132 string_list_clear(&p1, 0);
133 return -1;
136 if (name1) {
137 strbuf_addstr(&buffer1, name1);
138 strbuf_complete(&buffer1, '/');
139 len1 = buffer1.len;
142 if (name2) {
143 strbuf_addstr(&buffer2, name2);
144 strbuf_complete(&buffer2, '/');
145 len2 = buffer2.len;
148 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
149 const char *n1, *n2;
150 int comp;
152 strbuf_setlen(&buffer1, len1);
153 strbuf_setlen(&buffer2, len2);
155 if (i1 == p1.nr)
156 comp = 1;
157 else if (i2 == p2.nr)
158 comp = -1;
159 else
160 comp = strcmp(p1.items[i1].string, p2.items[i2].string);
162 if (comp > 0)
163 n1 = NULL;
164 else {
165 strbuf_addstr(&buffer1, p1.items[i1++].string);
166 n1 = buffer1.buf;
169 if (comp < 0)
170 n2 = NULL;
171 else {
172 strbuf_addstr(&buffer2, p2.items[i2++].string);
173 n2 = buffer2.buf;
176 ret = queue_diff(o, n1, n2);
178 string_list_clear(&p1, 0);
179 string_list_clear(&p2, 0);
180 strbuf_release(&buffer1);
181 strbuf_release(&buffer2);
183 return ret;
184 } else {
185 struct diff_filespec *d1, *d2;
187 if (o->flags.reverse_diff) {
188 SWAP(mode1, mode2);
189 SWAP(name1, name2);
192 d1 = noindex_filespec(name1, mode1);
193 d2 = noindex_filespec(name2, mode2);
194 diff_queue(&diff_queued_diff, d1, d2);
195 return 0;
199 /* append basename of F to D */
200 static void append_basename(struct strbuf *path, const char *dir, const char *file)
202 const char *tail = strrchr(file, '/');
204 strbuf_addstr(path, dir);
205 while (path->len && path->buf[path->len - 1] == '/')
206 path->len--;
207 strbuf_addch(path, '/');
208 strbuf_addstr(path, tail ? tail + 1 : file);
212 * DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F"
213 * Note that we append the basename of F to D/, so "diff a/b/file D"
214 * becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file".
216 static void fixup_paths(const char **path, struct strbuf *replacement)
218 unsigned int isdir0, isdir1;
220 if (path[0] == file_from_standard_input ||
221 path[1] == file_from_standard_input)
222 return;
223 isdir0 = is_directory(path[0]);
224 isdir1 = is_directory(path[1]);
225 if (isdir0 == isdir1)
226 return;
227 if (isdir0) {
228 append_basename(replacement, path[0], path[1]);
229 path[0] = replacement->buf;
230 } else {
231 append_basename(replacement, path[1], path[0]);
232 path[1] = replacement->buf;
236 void diff_no_index(struct rev_info *revs,
237 int argc, const char **argv)
239 int i;
240 const char *paths[2];
241 struct strbuf replacement = STRBUF_INIT;
242 const char *prefix = revs->prefix;
244 diff_setup(&revs->diffopt);
245 for (i = 1; i < argc - 2; ) {
246 int j;
247 if (!strcmp(argv[i], "--no-index"))
248 i++;
249 else if (!strcmp(argv[i], "--"))
250 i++;
251 else {
252 j = diff_opt_parse(&revs->diffopt, argv + i, argc - i,
253 revs->prefix);
254 if (j <= 0)
255 die("invalid diff option/value: %s", argv[i]);
256 i += j;
260 for (i = 0; i < 2; i++) {
261 const char *p = argv[argc - 2 + i];
262 if (!strcmp(p, "-"))
264 * stdin should be spelled as "-"; if you have
265 * path that is "-", spell it as "./-".
267 p = file_from_standard_input;
268 else if (prefix)
269 p = prefix_filename(prefix, p);
270 paths[i] = p;
273 fixup_paths(paths, &replacement);
275 revs->diffopt.skip_stat_unmatch = 1;
276 if (!revs->diffopt.output_format)
277 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
279 revs->diffopt.flags.no_index = 1;
281 revs->diffopt.flags.relative_name = 1;
282 revs->diffopt.prefix = prefix;
284 revs->max_count = -2;
285 diff_setup_done(&revs->diffopt);
287 setup_diff_pager(&revs->diffopt);
288 revs->diffopt.flags.exit_with_status = 1;
290 if (queue_diff(&revs->diffopt, paths[0], paths[1]))
291 exit(1);
292 diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
293 diffcore_std(&revs->diffopt);
294 diff_flush(&revs->diffopt);
296 strbuf_release(&replacement);
299 * The return code for --no-index imitates diff(1):
300 * 0 = no changes, 1 = changes, else error
302 exit(diff_result_code(&revs->diffopt, 0));