cvsserver: add notes on how to get a checkout under Eclipse
[git.git] / revision.c
1 #include "cache.h"
2 #include "tag.h"
3 #include "blob.h"
4 #include "tree.h"
5 #include "commit.h"
6 #include "refs.h"
7 #include "revision.h"
8
9 static char *path_name(struct name_path *path, const char *name)
10 {
11         struct name_path *p;
12         char *n, *m;
13         int nlen = strlen(name);
14         int len = nlen + 1;
15
16         for (p = path; p; p = p->up) {
17                 if (p->elem_len)
18                         len += p->elem_len + 1;
19         }
20         n = xmalloc(len);
21         m = n + len - (nlen + 1);
22         strcpy(m, name);
23         for (p = path; p; p = p->up) {
24                 if (p->elem_len) {
25                         m -= p->elem_len + 1;
26                         memcpy(m, p->elem, p->elem_len);
27                         m[p->elem_len] = '/';
28                 }
29         }
30         return n;
31 }
32
33 struct object_list **add_object(struct object *obj,
34                                        struct object_list **p,
35                                        struct name_path *path,
36                                        const char *name)
37 {
38         struct object_list *entry = xmalloc(sizeof(*entry));
39         entry->item = obj;
40         entry->next = *p;
41         entry->name = path_name(path, name);
42         *p = entry;
43         return &entry->next;
44 }
45
46 static void mark_blob_uninteresting(struct blob *blob)
47 {
48         if (blob->object.flags & UNINTERESTING)
49                 return;
50         blob->object.flags |= UNINTERESTING;
51 }
52
53 void mark_tree_uninteresting(struct tree *tree)
54 {
55         struct object *obj = &tree->object;
56         struct tree_entry_list *entry;
57
58         if (obj->flags & UNINTERESTING)
59                 return;
60         obj->flags |= UNINTERESTING;
61         if (!has_sha1_file(obj->sha1))
62                 return;
63         if (parse_tree(tree) < 0)
64                 die("bad tree %s", sha1_to_hex(obj->sha1));
65         entry = tree->entries;
66         tree->entries = NULL;
67         while (entry) {
68                 struct tree_entry_list *next = entry->next;
69                 if (entry->directory)
70                         mark_tree_uninteresting(entry->item.tree);
71                 else
72                         mark_blob_uninteresting(entry->item.blob);
73                 free(entry);
74                 entry = next;
75         }
76 }
77
78 void mark_parents_uninteresting(struct commit *commit)
79 {
80         struct commit_list *parents = commit->parents;
81
82         while (parents) {
83                 struct commit *commit = parents->item;
84                 commit->object.flags |= UNINTERESTING;
85
86                 /*
87                  * Normally we haven't parsed the parent
88                  * yet, so we won't have a parent of a parent
89                  * here. However, it may turn out that we've
90                  * reached this commit some other way (where it
91                  * wasn't uninteresting), in which case we need
92                  * to mark its parents recursively too..
93                  */
94                 if (commit->parents)
95                         mark_parents_uninteresting(commit);
96
97                 /*
98                  * A missing commit is ok iff its parent is marked
99                  * uninteresting.
100                  *
101                  * We just mark such a thing parsed, so that when
102                  * it is popped next time around, we won't be trying
103                  * to parse it and get an error.
104                  */
105                 if (!has_sha1_file(commit->object.sha1))
106                         commit->object.parsed = 1;
107                 parents = parents->next;
108         }
109 }
110
111 static void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
112 {
113         add_object(obj, &revs->pending_objects, NULL, name);
114 }
115
116 static struct commit *get_commit_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
117 {
118         struct object *object;
119
120         object = parse_object(sha1);
121         if (!object)
122                 die("bad object %s", name);
123
124         /*
125          * Tag object? Look what it points to..
126          */
127         while (object->type == tag_type) {
128                 struct tag *tag = (struct tag *) object;
129                 object->flags |= flags;
130                 if (revs->tag_objects && !(object->flags & UNINTERESTING))
131                         add_pending_object(revs, object, tag->tag);
132                 object = parse_object(tag->tagged->sha1);
133                 if (!object)
134                         die("bad object %s", sha1_to_hex(tag->tagged->sha1));
135         }
136
137         /*
138          * Commit object? Just return it, we'll do all the complex
139          * reachability crud.
140          */
141         if (object->type == commit_type) {
142                 struct commit *commit = (struct commit *)object;
143                 object->flags |= flags;
144                 if (parse_commit(commit) < 0)
145                         die("unable to parse commit %s", name);
146                 if (flags & UNINTERESTING) {
147                         mark_parents_uninteresting(commit);
148                         revs->limited = 1;
149                 }
150                 return commit;
151         }
152
153         /*
154          * Tree object? Either mark it uniniteresting, or add it
155          * to the list of objects to look at later..
156          */
157         if (object->type == tree_type) {
158                 struct tree *tree = (struct tree *)object;
159                 if (!revs->tree_objects)
160                         return NULL;
161                 if (flags & UNINTERESTING) {
162                         mark_tree_uninteresting(tree);
163                         return NULL;
164                 }
165                 add_pending_object(revs, object, "");
166                 return NULL;
167         }
168
169         /*
170          * Blob object? You know the drill by now..
171          */
172         if (object->type == blob_type) {
173                 struct blob *blob = (struct blob *)object;
174                 if (!revs->blob_objects)
175                         return NULL;
176                 if (flags & UNINTERESTING) {
177                         mark_blob_uninteresting(blob);
178                         return NULL;
179                 }
180                 add_pending_object(revs, object, "");
181                 return NULL;
182         }
183         die("%s is unknown object", name);
184 }
185
186 static void add_one_commit(struct commit *commit, struct rev_info *revs)
187 {
188         if (!commit || (commit->object.flags & SEEN))
189                 return;
190         commit->object.flags |= SEEN;
191         commit_list_insert(commit, &revs->commits);
192 }
193
194 static int all_flags;
195 static struct rev_info *all_revs;
196
197 static int handle_one_ref(const char *path, const unsigned char *sha1)
198 {
199         struct commit *commit = get_commit_reference(all_revs, path, sha1, all_flags);
200         add_one_commit(commit, all_revs);
201         return 0;
202 }
203
204 static void handle_all(struct rev_info *revs, unsigned flags)
205 {
206         all_revs = revs;
207         all_flags = flags;
208         for_each_ref(handle_one_ref);
209 }
210
211 /*
212  * Parse revision information, filling in the "rev_info" structure,
213  * and removing the used arguments from the argument list.
214  *
215  * Returns the number of arguments left ("new argc").
216  */
217 int setup_revisions(int argc, const char **argv, struct rev_info *revs)
218 {
219         int i, flags, seen_dashdash;
220         const char *def = NULL;
221         const char **unrecognized = argv+1;
222         int left = 1;
223
224         memset(revs, 0, sizeof(*revs));
225         revs->lifo = 1;
226         revs->dense = 1;
227         revs->prefix = setup_git_directory();
228         revs->max_age = -1;
229         revs->min_age = -1;
230         revs->max_count = -1;
231
232         /* First, search for "--" */
233         seen_dashdash = 0;
234         for (i = 1; i < argc; i++) {
235                 const char *arg = argv[i];
236                 if (strcmp(arg, "--"))
237                         continue;
238                 argv[i] = NULL;
239                 argc = i;
240                 revs->paths = get_pathspec(revs->prefix, argv + i + 1);
241                 seen_dashdash = 1;
242                 break;
243         }
244
245         flags = 0;
246         for (i = 1; i < argc; i++) {
247                 struct commit *commit;
248                 const char *arg = argv[i];
249                 unsigned char sha1[20];
250                 char *dotdot;
251                 int local_flags;
252
253                 if (*arg == '-') {
254                         if (!strncmp(arg, "--max-count=", 12)) {
255                                 revs->max_count = atoi(arg + 12);
256                                 continue;
257                         }
258                         if (!strncmp(arg, "--max-age=", 10)) {
259                                 revs->max_age = atoi(arg + 10);
260                                 revs->limited = 1;
261                                 continue;
262                         }
263                         if (!strncmp(arg, "--min-age=", 10)) {
264                                 revs->min_age = atoi(arg + 10);
265                                 revs->limited = 1;
266                                 continue;
267                         }
268                         if (!strcmp(arg, "--all")) {
269                                 handle_all(revs, flags);
270                                 continue;
271                         }
272                         if (!strcmp(arg, "--not")) {
273                                 flags ^= UNINTERESTING;
274                                 continue;
275                         }
276                         if (!strcmp(arg, "--default")) {
277                                 if (++i >= argc)
278                                         die("bad --default argument");
279                                 def = argv[i];
280                                 continue;
281                         }
282                         if (!strcmp(arg, "--topo-order")) {
283                                 revs->topo_order = 1;
284                                 revs->limited = 1;
285                                 continue;
286                         }
287                         if (!strcmp(arg, "--date-order")) {
288                                 revs->lifo = 0;
289                                 revs->topo_order = 1;
290                                 revs->limited = 1;
291                                 continue;
292                         }
293                         if (!strcmp(arg, "--dense")) {
294                                 revs->dense = 1;
295                                 continue;
296                         }
297                         if (!strcmp(arg, "--sparse")) {
298                                 revs->dense = 0;
299                                 continue;
300                         }
301                         if (!strcmp(arg, "--remove-empty")) {
302                                 revs->remove_empty_trees = 1;
303                                 continue;
304                         }
305                         if (!strcmp(arg, "--objects")) {
306                                 revs->tag_objects = 1;
307                                 revs->tree_objects = 1;
308                                 revs->blob_objects = 1;
309                                 continue;
310                         }
311                         if (!strcmp(arg, "--objects-edge")) {
312                                 revs->tag_objects = 1;
313                                 revs->tree_objects = 1;
314                                 revs->blob_objects = 1;
315                                 revs->edge_hint = 1;
316                                 continue;
317                         }
318                         if (!strcmp(arg, "--unpacked")) {
319                                 revs->unpacked = 1;
320                                 revs->limited = 1;
321                                 continue;
322                         }
323                         *unrecognized++ = arg;
324                         left++;
325                         continue;
326                 }
327                 dotdot = strstr(arg, "..");
328                 if (dotdot) {
329                         unsigned char from_sha1[20];
330                         char *next = dotdot + 2;
331                         *dotdot = 0;
332                         if (!*next)
333                                 next = "HEAD";
334                         if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
335                                 struct commit *exclude;
336                                 struct commit *include;
337
338                                 exclude = get_commit_reference(revs, arg, from_sha1, flags ^ UNINTERESTING);
339                                 include = get_commit_reference(revs, next, sha1, flags);
340                                 if (!exclude || !include)
341                                         die("Invalid revision range %s..%s", arg, next);
342                                 add_one_commit(exclude, revs);
343                                 add_one_commit(include, revs);
344                                 continue;
345                         }
346                         *dotdot = '.';
347                 }
348                 local_flags = 0;
349                 if (*arg == '^') {
350                         local_flags = UNINTERESTING;
351                         arg++;
352                 }
353                 if (get_sha1(arg, sha1) < 0) {
354                         struct stat st;
355                         int j;
356
357                         if (seen_dashdash || local_flags)
358                                 die("bad revision '%s'", arg);
359
360                         /* If we didn't have a "--", all filenames must exist */
361                         for (j = i; j < argc; j++) {
362                                 if (lstat(argv[j], &st) < 0)
363                                         die("'%s': %s", arg, strerror(errno));
364                         }
365                         revs->paths = get_pathspec(revs->prefix, argv + i);
366                         break;
367                 }
368                 commit = get_commit_reference(revs, arg, sha1, flags ^ local_flags);
369                 add_one_commit(commit, revs);
370         }
371         if (def && !revs->commits) {
372                 unsigned char sha1[20];
373                 struct commit *commit;
374                 if (get_sha1(def, sha1) < 0)
375                         die("bad default revision '%s'", def);
376                 commit = get_commit_reference(revs, def, sha1, 0);
377                 add_one_commit(commit, revs);
378         }
379         if (revs->paths)
380                 revs->limited = 1;
381         *unrecognized = NULL;
382         return left;
383 }