diff-no-index: DWIM "diff D F" into "diff D/F F"
[git/git.git] / diff-no-index.c
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1/*
2 * "diff --no-index" support
3 * Copyright (c) 2007 by Johannes Schindelin
4 * Copyright (c) 2008 by Junio C Hamano
5 */
6
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"
c455c87c 17#include "string-list.h"
fd3aeeab 18#include "dir.h"
0569e9b8 19
9daf0ef0 20static int read_directory_contents(const char *path, struct string_list *list)
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21{
22 DIR *dir;
23 struct dirent *e;
24
25 if (!(dir = opendir(path)))
26 return error("Could not open directory %s", path);
27
28 while ((e = readdir(dir)))
fd3aeeab 29 if (!is_dot_or_dotdot(e->d_name))
78a395d3 30 string_list_insert(list, e->d_name);
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31
32 closedir(dir);
33 return 0;
34}
35
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36/*
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.
40 */
41static const char file_from_standard_input[] = "-";
42
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43static int get_mode(const char *path, int *mode)
44{
45 struct stat st;
46
47 if (!path || !strcmp(path, "/dev/null"))
48 *mode = 0;
380395d0 49#ifdef GIT_WINDOWS_NATIVE
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50 else if (!strcasecmp(path, "nul"))
51 *mode = 0;
52#endif
4682d852 53 else if (path == file_from_standard_input)
0569e9b8 54 *mode = create_ce_mode(0666);
418566b6 55 else if (lstat(path, &st))
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56 return error("Could not access '%s'", path);
57 else
58 *mode = st.st_mode;
59 return 0;
60}
61
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62static int populate_from_stdin(struct diff_filespec *s)
63{
64 struct strbuf buf = STRBUF_INIT;
65 size_t size = 0;
66
67 if (strbuf_read(&buf, 0, 0) < 0)
68 return error("error while reading from stdin %s",
69 strerror(errno));
70
71 s->should_munmap = 0;
72 s->data = strbuf_detach(&buf, &size);
73 s->size = size;
74 s->should_free = 1;
75 s->is_stdin = 1;
76 return 0;
77}
78
79static struct diff_filespec *noindex_filespec(const char *name, int mode)
80{
81 struct diff_filespec *s;
82
83 if (!name)
84 name = "/dev/null";
85 s = alloc_filespec(name);
3b753148 86 fill_filespec(s, null_sha1, 0, mode);
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87 if (name == file_from_standard_input)
88 populate_from_stdin(s);
89 return s;
90}
91
0569e9b8 92static int queue_diff(struct diff_options *o,
875b91b3 93 const char *name1, const char *name2)
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94{
95 int mode1 = 0, mode2 = 0;
96
97 if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
98 return -1;
99
100 if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
101 return error("file/directory conflict: %s, %s", name1, name2);
102
103 if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
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104 struct strbuf buffer1 = STRBUF_INIT;
105 struct strbuf buffer2 = STRBUF_INIT;
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106 struct string_list p1 = STRING_LIST_INIT_DUP;
107 struct string_list p2 = STRING_LIST_INIT_DUP;
875b91b3 108 int i1, i2, ret = 0;
f3999e03 109 size_t len1 = 0, len2 = 0;
0569e9b8 110
9daf0ef0 111 if (name1 && read_directory_contents(name1, &p1))
0569e9b8 112 return -1;
9daf0ef0 113 if (name2 && read_directory_contents(name2, &p2)) {
c455c87c 114 string_list_clear(&p1, 0);
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115 return -1;
116 }
117
118 if (name1) {
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119 strbuf_addstr(&buffer1, name1);
120 if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
121 strbuf_addch(&buffer1, '/');
f3999e03 122 len1 = buffer1.len;
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123 }
124
125 if (name2) {
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126 strbuf_addstr(&buffer2, name2);
127 if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
128 strbuf_addch(&buffer2, '/');
f3999e03 129 len2 = buffer2.len;
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130 }
131
132 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
133 const char *n1, *n2;
134 int comp;
135
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136 strbuf_setlen(&buffer1, len1);
137 strbuf_setlen(&buffer2, len2);
138
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139 if (i1 == p1.nr)
140 comp = 1;
141 else if (i2 == p2.nr)
142 comp = -1;
143 else
875b91b3 144 comp = strcmp(p1.items[i1].string, p2.items[i2].string);
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145
146 if (comp > 0)
147 n1 = NULL;
148 else {
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149 strbuf_addstr(&buffer1, p1.items[i1++].string);
150 n1 = buffer1.buf;
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151 }
152
153 if (comp < 0)
154 n2 = NULL;
155 else {
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156 strbuf_addstr(&buffer2, p2.items[i2++].string);
157 n2 = buffer2.buf;
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158 }
159
160 ret = queue_diff(o, n1, n2);
161 }
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162 string_list_clear(&p1, 0);
163 string_list_clear(&p2, 0);
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164 strbuf_release(&buffer1);
165 strbuf_release(&buffer2);
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166
167 return ret;
168 } else {
169 struct diff_filespec *d1, *d2;
170
171 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
172 unsigned tmp;
173 const char *tmp_c;
174 tmp = mode1; mode1 = mode2; mode2 = tmp;
175 tmp_c = name1; name1 = name2; name2 = tmp_c;
176 }
177
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178 d1 = noindex_filespec(name1, mode1);
179 d2 = noindex_filespec(name2, mode2);
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180 diff_queue(&diff_queued_diff, d1, d2);
181 return 0;
182 }
183}
184
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185/* append basename of F to D */
186static void append_basename(struct strbuf *path, const char *dir, const char *file)
187{
188 const char *tail = strrchr(file, '/');
189
190 strbuf_addstr(path, dir);
191 while (path->len && path->buf[path->len - 1] == '/')
192 path->len--;
193 strbuf_addch(path, '/');
194 strbuf_addstr(path, tail ? tail + 1 : file);
195}
196
197/*
198 * DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F"
199 * Note that we append the basename of F to D/, so "diff a/b/file D"
200 * becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file".
201 */
202static void fixup_paths(const char **path, struct strbuf *replacement)
203{
204 unsigned int isdir0, isdir1;
205
206 if (path[0] == file_from_standard_input ||
207 path[1] == file_from_standard_input)
208 return;
209 isdir0 = is_directory(path[0]);
210 isdir1 = is_directory(path[1]);
211 if (isdir0 == isdir1)
212 return;
213 if (isdir0) {
214 append_basename(replacement, path[0], path[1]);
215 path[0] = replacement->buf;
216 } else {
217 append_basename(replacement, path[1], path[0]);
218 path[1] = replacement->buf;
219 }
220}
221
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222void diff_no_index(struct rev_info *revs,
223 int argc, const char **argv,
470faf96 224 const char *prefix)
0569e9b8 225{
3b069b1b 226 int i, prefixlen;
c20f5926 227 const char *paths[2];
c9e1f2c7 228 struct strbuf replacement = STRBUF_INIT;
0569e9b8 229
0569e9b8 230 diff_setup(&revs->diffopt);
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231 for (i = 1; i < argc - 2; ) {
232 int j;
233 if (!strcmp(argv[i], "--no-index"))
234 i++;
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235 else if (!strcmp(argv[i], "--"))
236 i++;
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237 else {
238 j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
ad1c3fbd 239 if (j <= 0)
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240 die("invalid diff option/value: %s", argv[i]);
241 i += j;
242 }
243 }
244
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245 prefixlen = prefix ? strlen(prefix) : 0;
246 for (i = 0; i < 2; i++) {
247 const char *p = argv[argc - 2 + i];
248 if (!strcmp(p, "-"))
0569e9b8 249 /*
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250 * stdin should be spelled as "-"; if you have
251 * path that is "-", spell it as "./-".
0569e9b8 252 */
4682d852 253 p = file_from_standard_input;
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254 else if (prefixlen)
255 p = xstrdup(prefix_filename(prefix, prefixlen, p));
256 paths[i] = p;
0569e9b8 257 }
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258
259 fixup_paths(paths, &replacement);
260
d61027b2 261 revs->diffopt.skip_stat_unmatch = 1;
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262 if (!revs->diffopt.output_format)
263 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
0569e9b8 264
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265 DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
266
267 revs->max_count = -2;
28452655 268 diff_setup_done(&revs->diffopt);
0569e9b8 269
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270 setup_diff_pager(&revs->diffopt);
271 DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
272
c20f5926 273 if (queue_diff(&revs->diffopt, paths[0], paths[1]))
0569e9b8 274 exit(1);
a5a818ee 275 diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
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276 diffcore_std(&revs->diffopt);
277 diff_flush(&revs->diffopt);
278
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279 strbuf_release(&replacement);
280
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281 /*
282 * The return code for --no-index imitates diff(1):
283 * 0 = no changes, 1 = changes, else error
284 */
304970dd 285 exit(diff_result_code(&revs->diffopt, 0));
0569e9b8 286}