Merge branch 'jn/perl-makemaker-leading-paths'
[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
19 static int read_directory(const char *path, struct string_list *list)
20 {
21         DIR *dir;
22         struct dirent *e;
23
24         if (!(dir = opendir(path)))
25                 return error("Could not open directory %s", path);
26
27         while ((e = readdir(dir)))
28                 if (strcmp(".", e->d_name) && strcmp("..", e->d_name))
29                         string_list_insert(list, e->d_name);
30
31         closedir(dir);
32         return 0;
33 }
34
35 static int get_mode(const char *path, int *mode)
36 {
37         struct stat st;
38
39         if (!path || !strcmp(path, "/dev/null"))
40                 *mode = 0;
41 #ifdef _WIN32
42         else if (!strcasecmp(path, "nul"))
43                 *mode = 0;
44 #endif
45         else if (!strcmp(path, "-"))
46                 *mode = create_ce_mode(0666);
47         else if (lstat(path, &st))
48                 return error("Could not access '%s'", path);
49         else
50                 *mode = st.st_mode;
51         return 0;
52 }
53
54 static int queue_diff(struct diff_options *o,
55                       const char *name1, const char *name2)
56 {
57         int mode1 = 0, mode2 = 0;
58
59         if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
60                 return -1;
61
62         if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2))
63                 return error("file/directory conflict: %s, %s", name1, name2);
64
65         if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
66                 struct strbuf buffer1 = STRBUF_INIT;
67                 struct strbuf buffer2 = STRBUF_INIT;
68                 struct string_list p1 = STRING_LIST_INIT_DUP;
69                 struct string_list p2 = STRING_LIST_INIT_DUP;
70                 int i1, i2, ret = 0;
71                 size_t len1 = 0, len2 = 0;
72
73                 if (name1 && read_directory(name1, &p1))
74                         return -1;
75                 if (name2 && read_directory(name2, &p2)) {
76                         string_list_clear(&p1, 0);
77                         return -1;
78                 }
79
80                 if (name1) {
81                         strbuf_addstr(&buffer1, name1);
82                         if (buffer1.len && buffer1.buf[buffer1.len - 1] != '/')
83                                 strbuf_addch(&buffer1, '/');
84                         len1 = buffer1.len;
85                 }
86
87                 if (name2) {
88                         strbuf_addstr(&buffer2, name2);
89                         if (buffer2.len && buffer2.buf[buffer2.len - 1] != '/')
90                                 strbuf_addch(&buffer2, '/');
91                         len2 = buffer2.len;
92                 }
93
94                 for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
95                         const char *n1, *n2;
96                         int comp;
97
98                         strbuf_setlen(&buffer1, len1);
99                         strbuf_setlen(&buffer2, len2);
100
101                         if (i1 == p1.nr)
102                                 comp = 1;
103                         else if (i2 == p2.nr)
104                                 comp = -1;
105                         else
106                                 comp = strcmp(p1.items[i1].string, p2.items[i2].string);
107
108                         if (comp > 0)
109                                 n1 = NULL;
110                         else {
111                                 strbuf_addstr(&buffer1, p1.items[i1++].string);
112                                 n1 = buffer1.buf;
113                         }
114
115                         if (comp < 0)
116                                 n2 = NULL;
117                         else {
118                                 strbuf_addstr(&buffer2, p2.items[i2++].string);
119                                 n2 = buffer2.buf;
120                         }
121
122                         ret = queue_diff(o, n1, n2);
123                 }
124                 string_list_clear(&p1, 0);
125                 string_list_clear(&p2, 0);
126                 strbuf_release(&buffer1);
127                 strbuf_release(&buffer2);
128
129                 return ret;
130         } else {
131                 struct diff_filespec *d1, *d2;
132
133                 if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
134                         unsigned tmp;
135                         const char *tmp_c;
136                         tmp = mode1; mode1 = mode2; mode2 = tmp;
137                         tmp_c = name1; name1 = name2; name2 = tmp_c;
138                 }
139
140                 if (!name1)
141                         name1 = "/dev/null";
142                 if (!name2)
143                         name2 = "/dev/null";
144                 d1 = alloc_filespec(name1);
145                 d2 = alloc_filespec(name2);
146                 fill_filespec(d1, null_sha1, mode1);
147                 fill_filespec(d2, null_sha1, mode2);
148
149                 diff_queue(&diff_queued_diff, d1, d2);
150                 return 0;
151         }
152 }
153
154 void diff_no_index(struct rev_info *revs,
155                    int argc, const char **argv,
156                    int nongit, const char *prefix)
157 {
158         int i;
159         int no_index = 0;
160         unsigned options = 0;
161
162         /* Were we asked to do --no-index explicitly? */
163         for (i = 1; i < argc; i++) {
164                 if (!strcmp(argv[i], "--")) {
165                         i++;
166                         break;
167                 }
168                 if (!strcmp(argv[i], "--no-index"))
169                         no_index = 1;
170                 if (argv[i][0] != '-')
171                         break;
172         }
173
174         if (!no_index && !nongit) {
175                 /*
176                  * Inside a git repository, without --no-index.  Only
177                  * when a path outside the repository is given,
178                  * e.g. "git diff /var/tmp/[12]", or "git diff
179                  * Makefile /var/tmp/Makefile", allow it to be used as
180                  * a colourful "diff" replacement.
181                  */
182                 if ((argc != i + 2) ||
183                     (path_inside_repo(prefix, argv[i]) &&
184                      path_inside_repo(prefix, argv[i+1])))
185                         return;
186         }
187         if (argc != i + 2)
188                 usagef("git diff %s <path> <path>",
189                        no_index ? "--no-index" : "[--no-index]");
190
191         diff_setup(&revs->diffopt);
192         for (i = 1; i < argc - 2; ) {
193                 int j;
194                 if (!strcmp(argv[i], "--no-index"))
195                         i++;
196                 else if (!strcmp(argv[i], "-q")) {
197                         options |= DIFF_SILENT_ON_REMOVED;
198                         i++;
199                 }
200                 else if (!strcmp(argv[i], "--"))
201                         i++;
202                 else {
203                         j = diff_opt_parse(&revs->diffopt, argv + i, argc - i);
204                         if (!j)
205                                 die("invalid diff option/value: %s", argv[i]);
206                         i += j;
207                 }
208         }
209
210         if (prefix) {
211                 int len = strlen(prefix);
212                 const char *paths[3];
213                 memset(paths, 0, sizeof(paths));
214
215                 for (i = 0; i < 2; i++) {
216                         const char *p = argv[argc - 2 + i];
217                         /*
218                          * stdin should be spelled as '-'; if you have
219                          * path that is '-', spell it as ./-.
220                          */
221                         p = (strcmp(p, "-")
222                              ? xstrdup(prefix_filename(prefix, len, p))
223                              : p);
224                         paths[i] = p;
225                 }
226                 diff_tree_setup_paths(paths, &revs->diffopt);
227         }
228         else
229                 diff_tree_setup_paths(argv + argc - 2, &revs->diffopt);
230         revs->diffopt.skip_stat_unmatch = 1;
231         if (!revs->diffopt.output_format)
232                 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
233
234         DIFF_OPT_SET(&revs->diffopt, NO_INDEX);
235
236         revs->max_count = -2;
237         if (diff_setup_done(&revs->diffopt) < 0)
238                 die("diff_setup_done failed");
239
240         setup_diff_pager(&revs->diffopt);
241         DIFF_OPT_SET(&revs->diffopt, EXIT_WITH_STATUS);
242
243         if (queue_diff(&revs->diffopt, revs->diffopt.pathspec.raw[0],
244                        revs->diffopt.pathspec.raw[1]))
245                 exit(1);
246         diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
247         diffcore_std(&revs->diffopt);
248         diff_flush(&revs->diffopt);
249
250         /*
251          * The return code for --no-index imitates diff(1):
252          * 0 = no changes, 1 = changes, else error
253          */
254         exit(diff_result_code(&revs->diffopt, 0));
255 }