git-clone: exit early if repo isn't specified
[gitweb.git] / rev-list.c
index 5ec9ccb6036bf79276f50fa13bd3cf9398c859f3..ee88f567a7c9413376669c01050a210241701012 100644 (file)
@@ -1,67 +1,77 @@
 #include "cache.h"
+#include "refs.h"
 #include "tag.h"
 #include "commit.h"
 #include "tree.h"
 #include "blob.h"
-#include "epoch.h"
+#include "tree-walk.h"
+#include "revision.h"
 
-#define SEEN           (1u << 0)
-#define INTERESTING    (1u << 1)
-#define COUNTED                (1u << 2)
-#define SHOWN          (1u << 3)
+/* bits #0-5 in revision.h */
+
+#define COUNTED                (1u<<6)
 
 static const char rev_list_usage[] =
-       "git-rev-list [OPTION] commit-id <commit-id>\n"
-                     "  --max-count=nr\n"
-                     "  --max-age=epoch\n"
-                     "  --min-age=epoch\n"
-                     "  --parents\n"
-                     "  --bisect\n"
-                     "  --objects\n"
-                     "  --unpacked\n"
-                     "  --header\n"
-                     "  --pretty\n"
-                     "  --no-merges\n"
-                     "  --merge-order [ --show-breaks ]\n"
-                     "  --topo-order";
-
-static int unpacked = 0;
+"git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
+"  limiting output:\n"
+"    --max-count=nr\n"
+"    --max-age=epoch\n"
+"    --min-age=epoch\n"
+"    --sparse\n"
+"    --no-merges\n"
+"    --remove-empty\n"
+"    --all\n"
+"  ordering output:\n"
+"    --topo-order\n"
+"    --date-order\n"
+"  formatting output:\n"
+"    --parents\n"
+"    --objects | --objects-edge\n"
+"    --unpacked\n"
+"    --header | --pretty\n"
+"    --abbrev=nr | --no-abbrev\n"
+"  special purpose:\n"
+"    --bisect"
+;
+
+struct rev_info revs;
+
 static int bisect_list = 0;
-static int tag_objects = 0;
-static int tree_objects = 0;
-static int blob_objects = 0;
 static int verbose_header = 0;
+static int abbrev = DEFAULT_ABBREV;
 static int show_parents = 0;
+static int show_timestamp = 0;
 static int hdr_termination = 0;
 static const char *commit_prefix = "";
-static unsigned long max_age = -1;
-static unsigned long min_age = -1;
-static int max_count = -1;
 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
-static int merge_order = 0;
-static int show_breaks = 0;
-static int stop_traversal = 0;
-static int topo_order = 0;
-static int no_merges = 0;
 
 static void show_commit(struct commit *commit)
 {
-       commit->object.flags |= SHOWN;
-       if (show_breaks) {
-               commit_prefix = "| ";
-               if (commit->object.flags & DISCONTINUITY) {
-                       commit_prefix = "^ ";     
-               } else if (commit->object.flags & BOUNDARY) {
-                       commit_prefix = "= ";
-               } 
-        }                      
-       printf("%s%s", commit_prefix, sha1_to_hex(commit->object.sha1));
+       if (show_timestamp)
+               printf("%lu ", commit->date);
+       if (commit_prefix[0])
+               fputs(commit_prefix, stdout);
+       if (commit->object.flags & BOUNDARY)
+               putchar('-');
+       fputs(sha1_to_hex(commit->object.sha1), stdout);
        if (show_parents) {
                struct commit_list *parents = commit->parents;
                while (parents) {
-                       printf(" %s", sha1_to_hex(parents->item->object.sha1));
+                       struct object *o = &(parents->item->object);
                        parents = parents->next;
+                       if (o->flags & TMP_MARK)
+                               continue;
+                       printf(" %s", sha1_to_hex(o->sha1));
+                       o->flags |= TMP_MARK;
                }
+               /* TMP_MARK is a general purpose flag that can
+                * be used locally, but the user should clean
+                * things up after it is done with them.
+                */
+               for (parents = commit->parents;
+                    parents;
+                    parents = parents->next)
+                       parents->item->object.flags &= ~TMP_MARK;
        }
        if (commit_format == CMIT_FMT_ONELINE)
                putchar(' ');
@@ -70,132 +80,93 @@ static void show_commit(struct commit *commit)
 
        if (verbose_header) {
                static char pretty_header[16384];
-               pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
+               pretty_print_commit(commit_format, commit, ~0, pretty_header, sizeof(pretty_header), abbrev);
                printf("%s%c", pretty_header, hdr_termination);
        }
        fflush(stdout);
 }
 
-static int filter_commit(struct commit * commit)
-{
-       if (stop_traversal && (commit->object.flags & BOUNDARY))
-               return STOP;
-       if (commit->object.flags & (UNINTERESTING|SHOWN))
-               return CONTINUE;
-       if (min_age != -1 && (commit->date > min_age))
-               return CONTINUE;
-       if (max_age != -1 && (commit->date < max_age)) {
-               stop_traversal=1;
-               return CONTINUE;
-       }
-       if (max_count != -1 && !max_count--)
-               return STOP;
-       if (no_merges && (commit->parents && commit->parents->next))
-               return CONTINUE;
-       return DO;
-}
-
-static int process_commit(struct commit * commit)
-{
-       int action=filter_commit(commit);
-
-       if (action == STOP) {
-               return STOP;
-       }
-
-       if (action == CONTINUE) {
-               return CONTINUE;
-       }
-
-       show_commit(commit);
-
-       return CONTINUE;
-}
-
-static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
-{
-       struct object_list *entry = xmalloc(sizeof(*entry));
-       entry->item = obj;
-       entry->next = *p;
-       entry->name = name;
-       *p = entry;
-       return &entry->next;
-}
-
-static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
+static struct object_list **process_blob(struct blob *blob,
+                                        struct object_list **p,
+                                        struct name_path *path,
+                                        const char *name)
 {
        struct object *obj = &blob->object;
 
-       if (!blob_objects)
+       if (!revs.blob_objects)
                return p;
        if (obj->flags & (UNINTERESTING | SEEN))
                return p;
        obj->flags |= SEEN;
-       return add_object(obj, p, name);
+       return add_object(obj, p, path, name);
 }
 
-static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
+static struct object_list **process_tree(struct tree *tree,
+                                        struct object_list **p,
+                                        struct name_path *path,
+                                        const char *name)
 {
        struct object *obj = &tree->object;
        struct tree_entry_list *entry;
+       struct name_path me;
 
-       if (!tree_objects)
+       if (!revs.tree_objects)
                return p;
        if (obj->flags & (UNINTERESTING | SEEN))
                return p;
        if (parse_tree(tree) < 0)
                die("bad tree object %s", sha1_to_hex(obj->sha1));
        obj->flags |= SEEN;
-       p = add_object(obj, p, name);
+       p = add_object(obj, p, path, name);
+       me.up = path;
+       me.elem = name;
+       me.elem_len = strlen(name);
        entry = tree->entries;
        tree->entries = NULL;
        while (entry) {
                struct tree_entry_list *next = entry->next;
                if (entry->directory)
-                       p = process_tree(entry->item.tree, p, entry->name);
+                       p = process_tree(entry->item.tree, p, &me, entry->name);
                else
-                       p = process_blob(entry->item.blob, p, entry->name);
+                       p = process_blob(entry->item.blob, p, &me, entry->name);
                free(entry);
                entry = next;
        }
        return p;
 }
 
-static struct object_list *pending_objects = NULL;
-
-static void show_commit_list(struct commit_list *list)
+static void show_commit_list(struct rev_info *revs)
 {
+       struct commit *commit;
        struct object_list *objects = NULL, **p = &objects, *pending;
-       while (list) {
-               struct commit *commit = pop_most_recent_commit(&list, SEEN);
 
-               p = process_tree(commit->tree, p, "");
-               if (process_commit(commit) == STOP)
-                       break;
+       while ((commit = get_revision(revs)) != NULL) {
+               p = process_tree(commit->tree, p, NULL, "");
+               show_commit(commit);
        }
-       for (pending = pending_objects; pending; pending = pending->next) {
+       for (pending = revs->pending_objects; pending; pending = pending->next) {
                struct object *obj = pending->item;
                const char *name = pending->name;
                if (obj->flags & (UNINTERESTING | SEEN))
                        continue;
                if (obj->type == tag_type) {
                        obj->flags |= SEEN;
-                       p = add_object(obj, p, name);
+                       p = add_object(obj, p, NULL, name);
                        continue;
                }
                if (obj->type == tree_type) {
-                       p = process_tree((struct tree *)obj, p, name);
+                       p = process_tree((struct tree *)obj, p, NULL, name);
                        continue;
                }
                if (obj->type == blob_type) {
-                       p = process_blob((struct blob *)obj, p, name);
+                       p = process_blob((struct blob *)obj, p, NULL, name);
                        continue;
                }
                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
        }
        while (objects) {
-               /* An object with name "foo\n0000000000000000000000000000000000000000"
-                * can be used confuse downstream git-pack-objects very badly.
+               /* An object with name "foo\n0000000..." can be used to
+                * confuse downstream git-pack-objects very badly.
                 */
                const char *ep = strchr(objects->name, '\n');
                if (ep) {
@@ -209,88 +180,6 @@ static void show_commit_list(struct commit_list *list)
        }
 }
 
-static void mark_blob_uninteresting(struct blob *blob)
-{
-       if (!blob_objects)
-               return;
-       if (blob->object.flags & UNINTERESTING)
-               return;
-       blob->object.flags |= UNINTERESTING;
-}
-
-static void mark_tree_uninteresting(struct tree *tree)
-{
-       struct object *obj = &tree->object;
-       struct tree_entry_list *entry;
-
-       if (!tree_objects)
-               return;
-       if (obj->flags & UNINTERESTING)
-               return;
-       obj->flags |= UNINTERESTING;
-       if (!has_sha1_file(obj->sha1))
-               return;
-       if (parse_tree(tree) < 0)
-               die("bad tree %s", sha1_to_hex(obj->sha1));
-       entry = tree->entries;
-       tree->entries = NULL;
-       while (entry) {
-               struct tree_entry_list *next = entry->next;
-               if (entry->directory)
-                       mark_tree_uninteresting(entry->item.tree);
-               else
-                       mark_blob_uninteresting(entry->item.blob);
-               free(entry);
-               entry = next;
-       }
-}
-
-static void mark_parents_uninteresting(struct commit *commit)
-{
-       struct commit_list *parents = commit->parents;
-
-       while (parents) {
-               struct commit *commit = parents->item;
-               commit->object.flags |= UNINTERESTING;
-
-               /*
-                * Normally we haven't parsed the parent
-                * yet, so we won't have a parent of a parent
-                * here. However, it may turn out that we've
-                * reached this commit some other way (where it
-                * wasn't uninteresting), in which case we need
-                * to mark its parents recursively too..
-                */
-               if (commit->parents)
-                       mark_parents_uninteresting(commit);
-
-               /*
-                * A missing commit is ok iff its parent is marked 
-                * uninteresting.
-                *
-                * We just mark such a thing parsed, so that when
-                * it is popped next time around, we won't be trying
-                * to parse it and get an error.
-                */
-               if (!has_sha1_file(commit->object.sha1))
-                       commit->object.parsed = 1;
-               parents = parents->next;
-       }
-}
-
-static int everybody_uninteresting(struct commit_list *orig)
-{
-       struct commit_list *list = orig;
-       while (list) {
-               struct commit *commit = list->item;
-               list = list->next;
-               if (commit->object.flags & UNINTERESTING)
-                       continue;
-               return 0;
-       }
-       return 1;
-}
-
 /*
  * This is a truly stupid algorithm, but it's only
  * used for bisection, and we just don't care enough.
@@ -308,7 +197,8 @@ static int count_distance(struct commit_list *entry)
 
                if (commit->object.flags & (UNINTERESTING | COUNTED))
                        break;
-               nr++;
+               if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
+                       nr++;
                commit->object.flags |= COUNTED;
                p = commit->parents;
                entry = p;
@@ -320,6 +210,7 @@ static int count_distance(struct commit_list *entry)
                        }
                }
        }
+
        return nr;
 }
 
@@ -340,15 +231,20 @@ static struct commit_list *find_bisection(struct commit_list *list)
        nr = 0;
        p = list;
        while (p) {
-               nr++;
+               if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
+                       nr++;
                p = p->next;
        }
        closest = 0;
        best = list;
 
-       p = list;
-       while (p) {
-               int distance = count_distance(p);
+       for (p = list; p; p = p->next) {
+               int distance;
+
+               if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
+                       continue;
+
+               distance = count_distance(p);
                clear_distance(list);
                if (nr - distance < distance)
                        distance = nr - distance;
@@ -356,170 +252,82 @@ static struct commit_list *find_bisection(struct commit_list *list)
                        best = p;
                        closest = distance;
                }
-               p = p->next;
        }
        if (best)
                best->next = NULL;
        return best;
 }
 
-static void mark_edges_uninteresting(struct commit_list *list)
+static void mark_edge_parents_uninteresting(struct commit *commit)
 {
-       for ( ; list; list = list->next) {
-               struct commit_list *parents = list->item->parents;
-
-               for ( ; parents; parents = parents->next) {
-                       struct commit *commit = parents->item;
-                       if (commit->object.flags & UNINTERESTING)
-                               mark_tree_uninteresting(commit->tree);
-               }
-       }
-}
+       struct commit_list *parents;
 
-static struct commit_list *limit_list(struct commit_list *list)
-{
-       struct commit_list *newlist = NULL;
-       struct commit_list **p = &newlist;
-       while (list) {
-               struct commit *commit = pop_most_recent_commit(&list, SEEN);
-               struct object *obj = &commit->object;
-
-               if (max_age != -1 && (commit->date < max_age))
-                       obj->flags |= UNINTERESTING;
-               if (unpacked && has_sha1_pack(obj->sha1))
-                       obj->flags |= UNINTERESTING;
-               if (obj->flags & UNINTERESTING) {
-                       mark_parents_uninteresting(commit);
-                       if (everybody_uninteresting(list))
-                               break;
+       for (parents = commit->parents; parents; parents = parents->next) {
+               struct commit *parent = parents->item;
+               if (!(parent->object.flags & UNINTERESTING))
                        continue;
+               mark_tree_uninteresting(parent->tree);
+               if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
+                       parent->object.flags |= SHOWN;
+                       printf("-%s\n", sha1_to_hex(parent->object.sha1));
                }
-               if (min_age != -1 && (commit->date > min_age))
-                       continue;
-               p = &commit_list_insert(commit, p)->next;
        }
-       if (tree_objects)
-               mark_edges_uninteresting(newlist);
-       if (bisect_list)
-               newlist = find_bisection(newlist);
-       return newlist;
 }
 
-static void add_pending_object(struct object *obj, const char *name)
-{
-       add_object(obj, &pending_objects, name);
-}
-
-static struct commit *get_commit_reference(const char *name, unsigned int flags)
+static void mark_edges_uninteresting(struct commit_list *list)
 {
-       unsigned char sha1[20];
-       struct object *object;
-
-       if (get_sha1(name, sha1))
-               usage(rev_list_usage);
-       object = parse_object(sha1);
-       if (!object)
-               die("bad object %s", name);
-
-       /*
-        * Tag object? Look what it points to..
-        */
-       while (object->type == tag_type) {
-               struct tag *tag = (struct tag *) object;
-               object->flags |= flags;
-               if (tag_objects && !(object->flags & UNINTERESTING))
-                       add_pending_object(object, tag->tag);
-               object = parse_object(tag->tagged->sha1);
-               if (!object)
-                       die("bad object %s", sha1_to_hex(tag->tagged->sha1));
-       }
-
-       /*
-        * Commit object? Just return it, we'll do all the complex
-        * reachability crud.
-        */
-       if (object->type == commit_type) {
-               struct commit *commit = (struct commit *)object;
-               object->flags |= flags;
-               if (parse_commit(commit) < 0)
-                       die("unable to parse commit %s", name);
-               if (flags & UNINTERESTING)
-                       mark_parents_uninteresting(commit);
-               return commit;
-       }
-
-       /*
-        * Tree object? Either mark it uniniteresting, or add it
-        * to the list of objects to look at later..
-        */
-       if (object->type == tree_type) {
-               struct tree *tree = (struct tree *)object;
-               if (!tree_objects)
-                       return NULL;
-               if (flags & UNINTERESTING) {
-                       mark_tree_uninteresting(tree);
-                       return NULL;
-               }
-               add_pending_object(object, "");
-               return NULL;
-       }
+       for ( ; list; list = list->next) {
+               struct commit *commit = list->item;
 
-       /*
-        * Blob object? You know the drill by now..
-        */
-       if (object->type == blob_type) {
-               struct blob *blob = (struct blob *)object;
-               if (!blob_objects)
-                       return NULL;
-               if (flags & UNINTERESTING) {
-                       mark_blob_uninteresting(blob);
-                       return NULL;
+               if (commit->object.flags & UNINTERESTING) {
+                       mark_tree_uninteresting(commit->tree);
+                       continue;
                }
-               add_pending_object(object, "");
-               return NULL;
+               mark_edge_parents_uninteresting(commit);
        }
-       die("%s is unknown object", name);
 }
 
-static void handle_one_commit(struct commit *com, struct commit_list **lst)
+int main(int argc, const char **argv)
 {
-       if (!com || com->object.flags & SEEN)
-               return;
-       com->object.flags |= SEEN;
-       commit_list_insert(com, lst);
-}
+       struct commit_list *list;
+       int i;
 
+       argc = setup_revisions(argc, argv, &revs, NULL);
 
-int main(int argc, char **argv)
-{
-       struct commit_list *list = NULL;
-       int i, limited = 0;
-
-       setup_git_directory();
        for (i = 1 ; i < argc; i++) {
-               int flags;
-               char *arg = argv[i];
-               char *dotdot;
-               struct commit *commit;
+               const char *arg = argv[i];
 
-               if (!strncmp(arg, "--max-count=", 12)) {
-                       max_count = atoi(arg + 12);
+               /* accept -<digit>, like traditilnal "head" */
+               if ((*arg == '-') && isdigit(arg[1])) {
+                       revs.max_count = atoi(arg + 1);
                        continue;
                }
-               if (!strncmp(arg, "--max-age=", 10)) {
-                       max_age = atoi(arg + 10);
-                       limited = 1;
+               if (!strcmp(arg, "-n")) {
+                       if (++i >= argc)
+                               die("-n requires an argument");
+                       revs.max_count = atoi(argv[i]);
                        continue;
                }
-               if (!strncmp(arg, "--min-age=", 10)) {
-                       min_age = atoi(arg + 10);
-                       limited = 1;
+               if (!strncmp(arg,"-n",2)) {
+                       revs.max_count = atoi(arg + 2);
                        continue;
                }
                if (!strcmp(arg, "--header")) {
                        verbose_header = 1;
                        continue;
                }
+               if (!strcmp(arg, "--no-abbrev")) {
+                       abbrev = 0;
+                       continue;
+               }
+               if (!strncmp(arg, "--abbrev=", 9)) {
+                       abbrev = strtoul(arg + 9, NULL, 10);
+                       if (abbrev && abbrev < MINIMUM_ABBREV)
+                               abbrev = MINIMUM_ABBREV;
+                       else if (40 < abbrev)
+                               abbrev = 40;
+                       continue;
+               }
                if (!strncmp(arg, "--pretty", 8)) {
                        commit_format = get_commit_format(arg+8);
                        verbose_header = 1;
@@ -530,93 +338,39 @@ int main(int argc, char **argv)
                                commit_prefix = "commit ";
                        continue;
                }
-               if (!strncmp(arg, "--no-merges", 11)) {
-                       no_merges = 1;
-                       continue;
-               }
                if (!strcmp(arg, "--parents")) {
                        show_parents = 1;
                        continue;
                }
-               if (!strcmp(arg, "--bisect")) {
-                       bisect_list = 1;
-                       continue;
-               }
-               if (!strcmp(arg, "--objects")) {
-                       tag_objects = 1;
-                       tree_objects = 1;
-                       blob_objects = 1;
-                       continue;
-               }
-               if (!strcmp(arg, "--unpacked")) {
-                       unpacked = 1;
-                       limited = 1;
-                       continue;
-               }
-               if (!strcmp(arg, "--merge-order")) {
-                       merge_order = 1;
-                       continue;
-               }
-               if (!strcmp(arg, "--show-breaks")) {
-                       show_breaks = 1;
+               if (!strcmp(arg, "--timestamp")) {
+                       show_timestamp = 1;
                        continue;
                }
-               if (!strcmp(arg, "--topo-order")) {
-                       topo_order = 1;
-                       limited = 1;
+               if (!strcmp(arg, "--bisect")) {
+                       bisect_list = 1;
                        continue;
                }
+               usage(rev_list_usage);
 
-               if (show_breaks && !merge_order)
-                       usage(rev_list_usage);
-
-               flags = 0;
-               dotdot = strstr(arg, "..");
-               if (dotdot) {
-                       char *next = dotdot + 2;
-                       struct commit *exclude = NULL;
-                       struct commit *include = NULL;
-                       *dotdot = 0;
-                       if (!*next)
-                               next = "HEAD";
-                       exclude = get_commit_reference(arg, UNINTERESTING);
-                       include = get_commit_reference(next, 0);
-                       if (exclude && include) {
-                               limited = 1;
-                               handle_one_commit(exclude, &list);
-                               handle_one_commit(include, &list);
-                               continue;
-                       }
-                       *dotdot = '.';
-               }
-               if (*arg == '^') {
-                       flags = UNINTERESTING;
-                       arg++;
-                       limited = 1;
-               }
-               commit = get_commit_reference(arg, flags);
-               handle_one_commit(commit, &list);
        }
 
+       list = revs.commits;
+
+       if (!list &&
+           (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) && !revs.pending_objects))
+               usage(rev_list_usage);
+
        save_commit_buffer = verbose_header;
        track_object_refs = 0;
 
-       if (!merge_order) {             
-               sort_by_date(&list);
-               if (limited)
-                       list = limit_list(list);
-               if (topo_order)
-                       sort_in_topological_order(&list);
-               show_commit_list(list);
-       } else {
-#ifndef NO_OPENSSL
-               if (sort_list_in_merge_order(list, &process_commit)) {
-                       die("merge order sort failed\n");
-               }
-#else
-               die("merge order sort unsupported, OpenSSL not linked");
-#endif
-       }
+       prepare_revision_walk(&revs);
+       if (revs.tree_objects)
+               mark_edges_uninteresting(revs.commits);
+
+       if (bisect_list)
+               revs.commits = find_bisection(revs.commits);
+
+       show_commit_list(&revs);
 
        return 0;
 }