Merge branch 'jn/libperl-git-config'
[git] / list-objects.c
1 #include "cache.h"
2 #include "tag.h"
3 #include "commit.h"
4 #include "tree.h"
5 #include "blob.h"
6 #include "diff.h"
7 #include "tree-walk.h"
8 #include "revision.h"
9 #include "list-objects.h"
10
11 static void process_blob(struct rev_info *revs,
12                          struct blob *blob,
13                          show_object_fn show,
14                          struct name_path *path,
15                          const char *name,
16                          void *cb_data)
17 {
18         struct object *obj = &blob->object;
19
20         if (!revs->blob_objects)
21                 return;
22         if (!obj)
23                 die("bad blob object");
24         if (obj->flags & (UNINTERESTING | SEEN))
25                 return;
26         obj->flags |= SEEN;
27         show(obj, path, name, cb_data);
28 }
29
30 /*
31  * Processing a gitlink entry currently does nothing, since
32  * we do not recurse into the subproject.
33  *
34  * We *could* eventually add a flag that actually does that,
35  * which would involve:
36  *  - is the subproject actually checked out?
37  *  - if so, see if the subproject has already been added
38  *    to the alternates list, and add it if not.
39  *  - process the commit (or tag) the gitlink points to
40  *    recursively.
41  *
42  * However, it's unclear whether there is really ever any
43  * reason to see superprojects and subprojects as such a
44  * "unified" object pool (potentially resulting in a totally
45  * humongous pack - avoiding which was the whole point of
46  * having gitlinks in the first place!).
47  *
48  * So for now, there is just a note that we *could* follow
49  * the link, and how to do it. Whether it necessarily makes
50  * any sense what-so-ever to ever do that is another issue.
51  */
52 static void process_gitlink(struct rev_info *revs,
53                             const unsigned char *sha1,
54                             show_object_fn show,
55                             struct name_path *path,
56                             const char *name,
57                             void *cb_data)
58 {
59         /* Nothing to do */
60 }
61
62 static void process_tree(struct rev_info *revs,
63                          struct tree *tree,
64                          show_object_fn show,
65                          struct name_path *path,
66                          struct strbuf *base,
67                          const char *name,
68                          void *cb_data)
69 {
70         struct object *obj = &tree->object;
71         struct tree_desc desc;
72         struct name_entry entry;
73         struct name_path me;
74         int match = revs->diffopt.pathspec.nr == 0 ? 2 : 0;
75         int baselen = base->len;
76
77         if (!revs->tree_objects)
78                 return;
79         if (!obj)
80                 die("bad tree object");
81         if (obj->flags & (UNINTERESTING | SEEN))
82                 return;
83         if (parse_tree(tree) < 0)
84                 die("bad tree object %s", sha1_to_hex(obj->sha1));
85         obj->flags |= SEEN;
86         show(obj, path, name, cb_data);
87         me.up = path;
88         me.elem = name;
89         me.elem_len = strlen(name);
90
91         if (!match) {
92                 strbuf_addstr(base, name);
93                 if (base->len)
94                         strbuf_addch(base, '/');
95         }
96
97         init_tree_desc(&desc, tree->buffer, tree->size);
98
99         while (tree_entry(&desc, &entry)) {
100                 if (match != 2) {
101                         match = tree_entry_interesting(&entry, base, 0,
102                                                        &revs->diffopt.pathspec);
103                         if (match < 0)
104                                 break;
105                         if (match == 0)
106                                 continue;
107                 }
108
109                 if (S_ISDIR(entry.mode))
110                         process_tree(revs,
111                                      lookup_tree(entry.sha1),
112                                      show, &me, base, entry.path,
113                                      cb_data);
114                 else if (S_ISGITLINK(entry.mode))
115                         process_gitlink(revs, entry.sha1,
116                                         show, &me, entry.path,
117                                         cb_data);
118                 else
119                         process_blob(revs,
120                                      lookup_blob(entry.sha1),
121                                      show, &me, entry.path,
122                                      cb_data);
123         }
124         strbuf_setlen(base, baselen);
125         free(tree->buffer);
126         tree->buffer = NULL;
127 }
128
129 static void mark_edge_parents_uninteresting(struct commit *commit,
130                                             struct rev_info *revs,
131                                             show_edge_fn show_edge)
132 {
133         struct commit_list *parents;
134
135         for (parents = commit->parents; parents; parents = parents->next) {
136                 struct commit *parent = parents->item;
137                 if (!(parent->object.flags & UNINTERESTING))
138                         continue;
139                 mark_tree_uninteresting(parent->tree);
140                 if (revs->edge_hint && !(parent->object.flags & SHOWN)) {
141                         parent->object.flags |= SHOWN;
142                         show_edge(parent);
143                 }
144         }
145 }
146
147 void mark_edges_uninteresting(struct commit_list *list,
148                               struct rev_info *revs,
149                               show_edge_fn show_edge)
150 {
151         for ( ; list; list = list->next) {
152                 struct commit *commit = list->item;
153
154                 if (commit->object.flags & UNINTERESTING) {
155                         mark_tree_uninteresting(commit->tree);
156                         continue;
157                 }
158                 mark_edge_parents_uninteresting(commit, revs, show_edge);
159         }
160 }
161
162 static void add_pending_tree(struct rev_info *revs, struct tree *tree)
163 {
164         add_pending_object(revs, &tree->object, "");
165 }
166
167 void traverse_commit_list(struct rev_info *revs,
168                           show_commit_fn show_commit,
169                           show_object_fn show_object,
170                           void *data)
171 {
172         int i;
173         struct commit *commit;
174         struct strbuf base;
175
176         strbuf_init(&base, PATH_MAX);
177         while ((commit = get_revision(revs)) != NULL) {
178                 /*
179                  * an uninteresting boundary commit may not have its tree
180                  * parsed yet, but we are not going to show them anyway
181                  */
182                 if (commit->tree)
183                         add_pending_tree(revs, commit->tree);
184                 show_commit(commit, data);
185         }
186         for (i = 0; i < revs->pending.nr; i++) {
187                 struct object_array_entry *pending = revs->pending.objects + i;
188                 struct object *obj = pending->item;
189                 const char *name = pending->name;
190                 if (obj->flags & (UNINTERESTING | SEEN))
191                         continue;
192                 if (obj->type == OBJ_TAG) {
193                         obj->flags |= SEEN;
194                         show_object(obj, NULL, name, data);
195                         continue;
196                 }
197                 if (obj->type == OBJ_TREE) {
198                         process_tree(revs, (struct tree *)obj, show_object,
199                                      NULL, &base, name, data);
200                         continue;
201                 }
202                 if (obj->type == OBJ_BLOB) {
203                         process_blob(revs, (struct blob *)obj, show_object,
204                                      NULL, name, data);
205                         continue;
206                 }
207                 die("unknown pending object %s (%s)",
208                     sha1_to_hex(obj->sha1), name);
209         }
210         if (revs->pending.nr) {
211                 free(revs->pending.objects);
212                 revs->pending.nr = 0;
213                 revs->pending.alloc = 0;
214                 revs->pending.objects = NULL;
215         }
216         strbuf_release(&base);
217 }