Merge branch 'sk/spawn-less-case-insensitively-from-grep-O-i'
[git] / diff-no-index.c
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"
17 #include "string-list.h"
18 #include "dir.h"
19
20 static int read_directory_contents(const char *path, struct string_list *list)
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)))
29                 if (!is_dot_or_dotdot(e->d_name))
30                         string_list_insert(list, e->d_name);
31
32         closedir(dir);
33         return 0;
34 }
35
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  */
41 static const char file_from_standard_input[] = "-";
42
43 static int get_mode(const char *path, int *mode)
44 {
45         struct stat st;
46
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;
60 }
61
62 static 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
79 static 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);
86         fill_filespec(s, null_sha1, 0, mode);
87         if (name == file_from_standard_input)
88                 populate_from_stdin(s);
89         return s;
90 }
91
92 static int queue_diff(struct diff_options *o,
93                       const char *name1, const char *name2)
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)) {
104                 struct strbuf buffer1 = STRBUF_INIT;
105                 struct strbuf buffer2 = STRBUF_INIT;
106                 struct string_list p1 = STRING_LIST_INIT_DUP;
107                 struct string_list p2 = STRING_LIST_INIT_DUP;
108                 int i1, i2, ret = 0;
109                 size_t len1 = 0, len2 = 0;
110
111                 if (name1 && read_directory_contents(name1, &p1))
112                         return -1;
113                 if (name2 && read_directory_contents(name2, &p2)) {
114                         string_list_clear(&p1, 0);
115                         return -1;
116                 }
117
118                 if (name1) {
119                         strbuf_addstr(&buffer1, name1);
120                         if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
121                                 strbuf_addch(&buffer1, '/');
122                         len1 = buffer1.len;
123                 }
124
125                 if (name2) {
126                         strbuf_addstr(&buffer2, name2);
127                         if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
128                                 strbuf_addch(&buffer2, '/');
129                         len2 = buffer2.len;
130                 }
131
132                 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
133                         const char *n1, *n2;
134                         int comp;
135
136                         strbuf_setlen(&buffer1, len1);
137                         strbuf_setlen(&buffer2, len2);
138
139                         if (i1 == p1.nr)
140                                 comp = 1;
141                         else if (i2 == p2.nr)
142                                 comp = -1;
143                         else
144                                 comp = strcmp(p1.items[i1].string, p2.items[i2].string);
145
146                         if (comp > 0)
147                                 n1 = NULL;
148                         else {
149                                 strbuf_addstr(&buffer1, p1.items[i1++].string);
150                                 n1 = buffer1.buf;
151                         }
152
153                         if (comp < 0)
154                                 n2 = NULL;
155                         else {
156                                 strbuf_addstr(&buffer2, p2.items[i2++].string);
157                                 n2 = buffer2.buf;
158                         }
159
160                         ret = queue_diff(o, n1, n2);
161                 }
162                 string_list_clear(&p1, 0);
163                 string_list_clear(&p2, 0);
164                 strbuf_release(&buffer1);
165                 strbuf_release(&buffer2);
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
178                 d1 = noindex_filespec(name1, mode1);
179                 d2 = noindex_filespec(name2, mode2);
180                 diff_queue(&diff_queued_diff, d1, d2);
181                 return 0;
182         }
183 }
184
185 void diff_no_index(struct rev_info *revs,
186                    int argc, const char **argv,
187                    const char *prefix)
188 {
189         int i, prefixlen;
190         const char *paths[2];
191
192         diff_setup(&revs->diffopt);
193         for (i = 1; i < argc - 2; ) {
194                 int j;
195                 if (!strcmp(argv[i], "--no-index"))
196                         i++;
197                 else if (!strcmp(argv[i], "--"))
198                         i++;
199                 else {
200                         j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
201                         if (j <= 0)
202                                 die("invalid diff option/value: %s", argv[i]);
203                         i += j;
204                 }
205         }
206
207         prefixlen = prefix ? strlen(prefix) : 0;
208         for (i = 0; i < 2; i++) {
209                 const char *p = argv[argc - 2 + i];
210                 if (!strcmp(p, "-"))
211                         /*
212                          * stdin should be spelled as "-"; if you have
213                          * path that is "-", spell it as "./-".
214                          */
215                         p = file_from_standard_input;
216                 else if (prefixlen)
217                         p = xstrdup(prefix_filename(prefix, prefixlen, p));
218                 paths[i] = p;
219         }
220         revs->diffopt.skip_stat_unmatch = 1;
221         if (!revs->diffopt.output_format)
222                 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
223
224         DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
225
226         revs->max_count = -2;
227         diff_setup_done(&revs->diffopt);
228
229         setup_diff_pager(&revs->diffopt);
230         DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
231
232         if (queue_diff(&revs->diffopt, paths[0], paths[1]))
233                 exit(1);
234         diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
235         diffcore_std(&revs->diffopt);
236         diff_flush(&revs->diffopt);
237
238         /*
239          * The return code for --no-index imitates diff(1):
240          * 0 = no changes, 1 = changes, else error
241          */
242         exit(diff_result_code(&revs->diffopt, 0));
243 }