remove ugly shadowing of loop indexes in subloops.
[git] / builtin-mv.c
1 /*
2  * "git mv" builtin command
3  *
4  * Copyright (C) 2006 Johannes Schindelin
5  */
6 #include <fnmatch.h>
7
8 #include "cache.h"
9 #include "builtin.h"
10 #include "dir.h"
11 #include "cache-tree.h"
12 #include "path-list.h"
13
14 static const char builtin_mv_usage[] =
15 "git-mv [-n] [-f] (<source> <destination> | [-k] <source>... <destination>)";
16
17 static const char **copy_pathspec(const char *prefix, const char **pathspec,
18                                   int count, int base_name)
19 {
20         int i;
21         const char **result = xmalloc((count + 1) * sizeof(const char *));
22         memcpy(result, pathspec, count * sizeof(const char *));
23         result[count] = NULL;
24         for (i = 0; i < count; i++) {
25                 int length = strlen(result[i]);
26                 if (length > 0 && result[i][length - 1] == '/') {
27                         char *without_slash = xmalloc(length);
28                         memcpy(without_slash, result[i], length - 1);
29                         without_slash[length - 1] = '\0';
30                         result[i] = without_slash;
31                 }
32                 if (base_name) {
33                         const char *last_slash = strrchr(result[i], '/');
34                         if (last_slash)
35                                 result[i] = last_slash + 1;
36                 }
37         }
38         return get_pathspec(prefix, result);
39 }
40
41 static void show_list(const char *label, struct path_list *list)
42 {
43         if (list->nr > 0) {
44                 int i;
45                 printf("%s", label);
46                 for (i = 0; i < list->nr; i++)
47                         printf("%s%s", i > 0 ? ", " : "", list->items[i].path);
48                 putchar('\n');
49         }
50 }
51
52 static const char *add_slash(const char *path)
53 {
54         int len = strlen(path);
55         if (path[len - 1] != '/') {
56                 char *with_slash = xmalloc(len + 2);
57                 memcpy(with_slash, path, len);
58                 with_slash[len++] = '/';
59                 with_slash[len] = 0;
60                 return with_slash;
61         }
62         return path;
63 }
64
65 static struct lock_file lock_file;
66
67 int cmd_mv(int argc, const char **argv, const char *prefix)
68 {
69         int i, newfd, count;
70         int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
71         const char **source, **destination, **dest_path;
72         enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
73         struct stat st;
74         struct path_list overwritten = {NULL, 0, 0, 0};
75         struct path_list src_for_dst = {NULL, 0, 0, 0};
76         struct path_list added = {NULL, 0, 0, 0};
77         struct path_list deleted = {NULL, 0, 0, 0};
78         struct path_list changed = {NULL, 0, 0, 0};
79
80         git_config(git_default_config);
81
82         newfd = hold_lock_file_for_update(&lock_file, get_index_file(), 1);
83         if (read_cache() < 0)
84                 die("index file corrupt");
85
86         for (i = 1; i < argc; i++) {
87                 const char *arg = argv[i];
88
89                 if (arg[0] != '-')
90                         break;
91                 if (!strcmp(arg, "--")) {
92                         i++;
93                         break;
94                 }
95                 if (!strcmp(arg, "-n")) {
96                         show_only = 1;
97                         continue;
98                 }
99                 if (!strcmp(arg, "-f")) {
100                         force = 1;
101                         continue;
102                 }
103                 if (!strcmp(arg, "-k")) {
104                         ignore_errors = 1;
105                         continue;
106                 }
107                 usage(builtin_mv_usage);
108         }
109         count = argc - i - 1;
110         if (count < 1)
111                 usage(builtin_mv_usage);
112
113         source = copy_pathspec(prefix, argv + i, count, 0);
114         modes = xcalloc(count, sizeof(enum update_mode));
115         dest_path = copy_pathspec(prefix, argv + argc - 1, 1, 0);
116
117         if (dest_path[0][0] == '\0')
118                 /* special case: "." was normalized to "" */
119                 destination = copy_pathspec(dest_path[0], argv + i, count, 1);
120         else if (!lstat(dest_path[0], &st) &&
121                         S_ISDIR(st.st_mode)) {
122                 dest_path[0] = add_slash(dest_path[0]);
123                 destination = copy_pathspec(dest_path[0], argv + i, count, 1);
124         } else {
125                 if (count != 1)
126                         usage(builtin_mv_usage);
127                 destination = dest_path;
128         }
129
130         /* Checking */
131         for (i = 0; i < count; i++) {
132                 const char *src = source[i], *dst = destination[i];
133                 int length, src_is_dir;
134                 const char *bad = NULL;
135
136                 if (show_only)
137                         printf("Checking rename of '%s' to '%s'\n", src, dst);
138
139                 length = strlen(src);
140                 if (lstat(src, &st) < 0)
141                         bad = "bad source";
142                 else if (!strncmp(src, dst, length) &&
143                                 (dst[length] == 0 || dst[length] == '/')) {
144                         bad = "can not move directory into itself";
145                 } else if ((src_is_dir = S_ISDIR(st.st_mode))
146                                 && lstat(dst, &st) == 0)
147                         bad = "cannot move directory over file";
148                 else if (src_is_dir) {
149                         int first, last;
150
151                         modes[i] = WORKING_DIRECTORY;
152
153                         first = cache_name_pos(src, length);
154                         if (first >= 0)
155                                 die ("Huh? %s/ is in index?", src);
156
157                         first = -1 - first;
158                         for (last = first; last < active_nr; last++) {
159                                 const char *path = active_cache[last]->name;
160                                 if (strncmp(path, src, length)
161                                                 || path[length] != '/')
162                                         break;
163                         }
164
165                         if (last - first < 1)
166                                 bad = "source directory is empty";
167                         else {
168                                 int j, dst_len;
169
170                                 if (last - first > 0) {
171                                         source = realloc(source,
172                                                         (count + last - first)
173                                                         * sizeof(char *));
174                                         destination = realloc(destination,
175                                                         (count + last - first)
176                                                         * sizeof(char *));
177                                         modes = realloc(modes,
178                                                         (count + last - first)
179                                                         * sizeof(enum update_mode));
180                                 }
181
182                                 dst = add_slash(dst);
183                                 dst_len = strlen(dst) - 1;
184
185                                 for (j = 0; j < last - first; j++) {
186                                         const char *path =
187                                                 active_cache[first + j]->name;
188                                         source[count + j] = path;
189                                         destination[count + j] =
190                                                 prefix_path(dst, dst_len,
191                                                         path + length);
192                                         modes[count + j] = INDEX;
193                                 }
194                                 count += last - first;
195                         }
196                 } else if (lstat(dst, &st) == 0) {
197                         bad = "destination exists";
198                         if (force) {
199                                 /*
200                                  * only files can overwrite each other:
201                                  * check both source and destination
202                                  */
203                                 if (S_ISREG(st.st_mode)) {
204                                         fprintf(stderr, "Warning: %s;"
205                                                         " will overwrite!\n",
206                                                         bad);
207                                         bad = NULL;
208                                         path_list_insert(dst, &overwritten);
209                                 } else
210                                         bad = "Cannot overwrite";
211                         }
212                 } else if (cache_name_pos(src, length) < 0)
213                         bad = "not under version control";
214                 else if (path_list_has_path(&src_for_dst, dst))
215                         bad = "multiple sources for the same target";
216                 else
217                         path_list_insert(dst, &src_for_dst);
218
219                 if (bad) {
220                         if (ignore_errors) {
221                                 if (--count > 0) {
222                                         memmove(source + i, source + i + 1,
223                                                 (count - i) * sizeof(char *));
224                                         memmove(destination + i,
225                                                 destination + i + 1,
226                                                 (count - i) * sizeof(char *));
227                                 }
228                         } else
229                                 die ("%s, source=%s, destination=%s",
230                                      bad, src, dst);
231                 }
232         }
233
234         for (i = 0; i < count; i++) {
235                 const char *src = source[i], *dst = destination[i];
236                 enum update_mode mode = modes[i];
237                 if (show_only || verbose)
238                         printf("Renaming %s to %s\n", src, dst);
239                 if (!show_only && mode != INDEX &&
240                                 rename(src, dst) < 0 && !ignore_errors)
241                         die ("renaming %s failed: %s", src, strerror(errno));
242
243                 if (mode == WORKING_DIRECTORY)
244                         continue;
245
246                 if (cache_name_pos(src, strlen(src)) >= 0) {
247                         path_list_insert(src, &deleted);
248
249                         /* destination can be a directory with 1 file inside */
250                         if (path_list_has_path(&overwritten, dst))
251                                 path_list_insert(dst, &changed);
252                         else
253                                 path_list_insert(dst, &added);
254                 } else
255                         path_list_insert(dst, &added);
256         }
257
258         if (show_only) {
259                 show_list("Changed  : ", &changed);
260                 show_list("Adding   : ", &added);
261                 show_list("Deleting : ", &deleted);
262         } else {
263                 for (i = 0; i < changed.nr; i++) {
264                         const char *path = changed.items[i].path;
265                         int j = cache_name_pos(path, strlen(path));
266                         struct cache_entry *ce = active_cache[j];
267
268                         if (j < 0)
269                                 die ("Huh? Cache entry for %s unknown?", path);
270                         refresh_cache_entry(ce, 0);
271                 }
272
273                 for (i = 0; i < added.nr; i++) {
274                         const char *path = added.items[i].path;
275                         add_file_to_index(path, verbose);
276                 }
277
278                 for (i = 0; i < deleted.nr; i++) {
279                         const char *path = deleted.items[i].path;
280                         remove_file_from_cache(path);
281                 }
282
283                 if (active_cache_changed) {
284                         if (write_cache(newfd, active_cache, active_nr) ||
285                             close(newfd) ||
286                             commit_lock_file(&lock_file))
287                                 die("Unable to write new index file");
288                 }
289         }
290
291         return 0;
292 }