#include "blob.h"
#include "tree.h"
#include "commit.h"
+#include "diff.h"
#include "refs.h"
#include "revision.h"
while (parents) {
struct commit *commit = parents->item;
- commit->object.flags |= UNINTERESTING;
+ if (!(commit->object.flags & UNINTERESTING)) {
+ 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);
+ /*
+ * 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
object->flags |= flags;
if (parse_commit(commit) < 0)
die("unable to parse commit %s", name);
- if (flags & UNINTERESTING)
+ if (flags & UNINTERESTING) {
mark_parents_uninteresting(commit);
+ revs->limited = 1;
+ }
return commit;
}
die("%s is unknown object", name);
}
+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;
+}
+
+static int tree_difference = REV_TREE_SAME;
+
+static void file_add_remove(struct diff_options *options,
+ int addremove, unsigned mode,
+ const unsigned char *sha1,
+ const char *base, const char *path)
+{
+ int diff = REV_TREE_DIFFERENT;
+
+ /*
+ * Is it an add of a new file? It means that the old tree
+ * didn't have it at all, so we will turn "REV_TREE_SAME" ->
+ * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
+ * (and if it already was "REV_TREE_NEW", we'll keep it
+ * "REV_TREE_NEW" of course).
+ */
+ if (addremove == '+') {
+ diff = tree_difference;
+ if (diff != REV_TREE_SAME)
+ return;
+ diff = REV_TREE_NEW;
+ }
+ tree_difference = diff;
+}
+
+static void file_change(struct diff_options *options,
+ unsigned old_mode, unsigned new_mode,
+ const unsigned char *old_sha1,
+ const unsigned char *new_sha1,
+ const char *base, const char *path)
+{
+ tree_difference = REV_TREE_DIFFERENT;
+}
+
+static struct diff_options diff_opt = {
+ .recursive = 1,
+ .add_remove = file_add_remove,
+ .change = file_change,
+};
+
+int rev_compare_tree(struct tree *t1, struct tree *t2)
+{
+ if (!t1)
+ return REV_TREE_NEW;
+ if (!t2)
+ return REV_TREE_DIFFERENT;
+ tree_difference = REV_TREE_SAME;
+ if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "", &diff_opt) < 0)
+ return REV_TREE_DIFFERENT;
+ return tree_difference;
+}
+
+int rev_same_tree_as_empty(struct tree *t1)
+{
+ int retval;
+ void *tree;
+ struct tree_desc empty, real;
+
+ if (!t1)
+ return 0;
+
+ tree = read_object_with_reference(t1->object.sha1, "tree", &real.size, NULL);
+ if (!tree)
+ return 0;
+ real.buf = tree;
+
+ empty.buf = "";
+ empty.size = 0;
+
+ tree_difference = 0;
+ retval = diff_tree(&empty, &real, "", &diff_opt);
+ free(tree);
+
+ return retval >= 0 && !tree_difference;
+}
+
+static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
+{
+ struct commit_list **pp, *parent;
+ int tree_changed = 0;
+
+ if (!commit->tree)
+ return;
+
+ if (!commit->parents) {
+ if (!rev_same_tree_as_empty(commit->tree))
+ commit->object.flags |= TREECHANGE;
+ return;
+ }
+
+ pp = &commit->parents;
+ while ((parent = *pp) != NULL) {
+ struct commit *p = parent->item;
+
+ parse_commit(p);
+ switch (rev_compare_tree(p->tree, commit->tree)) {
+ case REV_TREE_SAME:
+ if (p->object.flags & UNINTERESTING) {
+ /* Even if a merge with an uninteresting
+ * side branch brought the entire change
+ * we are interested in, we do not want
+ * to lose the other branches of this
+ * merge, so we just keep going.
+ */
+ pp = &parent->next;
+ continue;
+ }
+ parent->next = NULL;
+ commit->parents = parent;
+ return;
+
+ case REV_TREE_NEW:
+ if (revs->remove_empty_trees &&
+ rev_same_tree_as_empty(p->tree)) {
+ /* We are adding all the specified
+ * paths from this parent, so the
+ * history beyond this parent is not
+ * interesting. Remove its parents
+ * (they are grandparents for us).
+ * IOW, we pretend this parent is a
+ * "root" commit.
+ */
+ parse_commit(p);
+ p->parents = NULL;
+ }
+ /* fallthrough */
+ case REV_TREE_DIFFERENT:
+ tree_changed = 1;
+ pp = &parent->next;
+ continue;
+ }
+ die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
+ }
+ if (tree_changed)
+ commit->object.flags |= TREECHANGE;
+}
+
+static void add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
+{
+ struct commit_list *parent = commit->parents;
+
+ /*
+ * If the commit is uninteresting, don't try to
+ * prune parents - we want the maximal uninteresting
+ * set.
+ *
+ * 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->object.flags & UNINTERESTING) {
+ while (parent) {
+ struct commit *p = parent->item;
+ parent = parent->next;
+ parse_commit(p);
+ p->object.flags |= UNINTERESTING;
+ if (p->parents)
+ mark_parents_uninteresting(p);
+ if (p->object.flags & SEEN)
+ continue;
+ p->object.flags |= SEEN;
+ insert_by_date(p, list);
+ }
+ return;
+ }
+
+ /*
+ * Ok, the commit wasn't uninteresting. Try to
+ * simplify the commit history and find the parent
+ * that has no differences in the path set if one exists.
+ */
+ if (revs->prune_fn)
+ revs->prune_fn(revs, commit);
+
+ parent = commit->parents;
+ while (parent) {
+ struct commit *p = parent->item;
+
+ parent = parent->next;
+
+ parse_commit(p);
+ if (p->object.flags & SEEN)
+ continue;
+ p->object.flags |= SEEN;
+ insert_by_date(p, list);
+ }
+}
+
+static void limit_list(struct rev_info *revs)
+{
+ struct commit_list *list = revs->commits;
+ struct commit_list *newlist = NULL;
+ struct commit_list **p = &newlist;
+
+ while (list) {
+ struct commit_list *entry = list;
+ struct commit *commit = list->item;
+ struct object *obj = &commit->object;
+
+ list = list->next;
+ free(entry);
+
+ if (revs->max_age != -1 && (commit->date < revs->max_age))
+ obj->flags |= UNINTERESTING;
+ if (revs->unpacked && has_sha1_pack(obj->sha1))
+ obj->flags |= UNINTERESTING;
+ add_parents_to_list(revs, commit, &list);
+ if (obj->flags & UNINTERESTING) {
+ mark_parents_uninteresting(commit);
+ if (everybody_uninteresting(list))
+ break;
+ continue;
+ }
+ if (revs->min_age != -1 && (commit->date > revs->min_age))
+ continue;
+ p = &commit_list_insert(commit, p)->next;
+ }
+ revs->commits = newlist;
+}
+
static void add_one_commit(struct commit *commit, struct rev_info *revs)
{
if (!commit || (commit->object.flags & SEEN))
for_each_ref(handle_one_ref);
}
+void init_revisions(struct rev_info *revs)
+{
+ memset(revs, 0, sizeof(*revs));
+ revs->lifo = 1;
+ revs->dense = 1;
+ revs->prefix = setup_git_directory();
+ revs->max_age = -1;
+ revs->min_age = -1;
+ revs->max_count = -1;
+
+ revs->prune_fn = NULL;
+ revs->prune_data = NULL;
+
+ revs->topo_setter = topo_sort_default_setter;
+ revs->topo_getter = topo_sort_default_getter;
+}
+
/*
* Parse revision information, filling in the "rev_info" structure,
* and removing the used arguments from the argument list.
*
- * Returns the number of arguments left ("new argc").
+ * Returns the number of arguments left that weren't recognized
+ * (which are also moved to the head of the argument list)
*/
-int setup_revisions(int argc, const char **argv, struct rev_info *revs)
+int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
{
int i, flags, seen_dashdash;
- const char *def = NULL;
- const char **unrecognized = argv+1;
+ const char **unrecognized = argv + 1;
int left = 1;
- memset(revs, 0, sizeof(*revs));
- revs->lifo = 1;
- revs->dense = 1;
- revs->prefix = setup_git_directory();
- revs->max_age = -1;
- revs->min_age = -1;
- revs->max_count = -1;
+ init_revisions(revs);
/* First, search for "--" */
seen_dashdash = 0;
continue;
argv[i] = NULL;
argc = i;
- revs->paths = get_pathspec(revs->prefix, argv + i + 1);
+ revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
seen_dashdash = 1;
break;
}
revs->max_count = atoi(arg + 12);
continue;
}
+ /* accept -<digit>, like traditilnal "head" */
+ if ((*arg == '-') && isdigit(arg[1])) {
+ revs->max_count = atoi(arg + 1);
+ continue;
+ }
+ if (!strcmp(arg, "-n")) {
+ if (argc <= i + 1)
+ die("-n requires an argument");
+ revs->max_count = atoi(argv[++i]);
+ continue;
+ }
+ if (!strncmp(arg,"-n",2)) {
+ revs->max_count = atoi(arg + 2);
+ continue;
+ }
if (!strncmp(arg, "--max-age=", 10)) {
revs->max_age = atoi(arg + 10);
+ revs->limited = 1;
continue;
}
if (!strncmp(arg, "--min-age=", 10)) {
revs->min_age = atoi(arg + 10);
+ revs->limited = 1;
+ continue;
+ }
+ if (!strncmp(arg, "--since=", 8)) {
+ revs->max_age = approxidate(arg + 8);
+ revs->limited = 1;
+ continue;
+ }
+ if (!strncmp(arg, "--after=", 8)) {
+ revs->max_age = approxidate(arg + 8);
+ revs->limited = 1;
+ continue;
+ }
+ if (!strncmp(arg, "--before=", 9)) {
+ revs->min_age = approxidate(arg + 9);
+ revs->limited = 1;
+ continue;
+ }
+ if (!strncmp(arg, "--until=", 8)) {
+ revs->min_age = approxidate(arg + 8);
+ revs->limited = 1;
continue;
}
if (!strcmp(arg, "--all")) {
}
if (!strcmp(arg, "--topo-order")) {
revs->topo_order = 1;
+ revs->limited = 1;
continue;
}
if (!strcmp(arg, "--date-order")) {
revs->lifo = 0;
revs->topo_order = 1;
+ revs->limited = 1;
continue;
}
if (!strcmp(arg, "--dense")) {
revs->remove_empty_trees = 1;
continue;
}
+ if (!strncmp(arg, "--no-merges", 11)) {
+ revs->no_merges = 1;
+ continue;
+ }
if (!strcmp(arg, "--objects")) {
revs->tag_objects = 1;
revs->tree_objects = 1;
revs->edge_hint = 1;
continue;
}
+ if (!strcmp(arg, "--unpacked")) {
+ revs->unpacked = 1;
+ revs->limited = 1;
+ continue;
+ }
*unrecognized++ = arg;
left++;
continue;
if (lstat(argv[j], &st) < 0)
die("'%s': %s", arg, strerror(errno));
}
- revs->paths = get_pathspec(revs->prefix, argv + i);
+ revs->prune_data = get_pathspec(revs->prefix, argv + i);
break;
}
commit = get_commit_reference(revs, arg, sha1, flags ^ local_flags);
commit = get_commit_reference(revs, def, sha1, 0);
add_one_commit(commit, revs);
}
- *unrecognized = NULL;
+
+ if (revs->prune_data) {
+ diff_tree_setup_paths(revs->prune_data);
+ revs->prune_fn = try_to_simplify_commit;
+ revs->limited = 1;
+ }
+
return left;
}
+
+void prepare_revision_walk(struct rev_info *revs)
+{
+ sort_by_date(&revs->commits);
+ if (revs->limited)
+ limit_list(revs);
+ if (revs->topo_order)
+ sort_in_topological_order_fn(&revs->commits, revs->lifo,
+ revs->topo_setter,
+ revs->topo_getter);
+}
+
+static int rewrite_one(struct commit **pp)
+{
+ for (;;) {
+ struct commit *p = *pp;
+ if (p->object.flags & (TREECHANGE | UNINTERESTING))
+ return 0;
+ if (!p->parents)
+ return -1;
+ *pp = p->parents->item;
+ }
+}
+
+static void rewrite_parents(struct commit *commit)
+{
+ struct commit_list **pp = &commit->parents;
+ while (*pp) {
+ struct commit_list *parent = *pp;
+ if (rewrite_one(&parent->item) < 0) {
+ *pp = parent->next;
+ continue;
+ }
+ pp = &parent->next;
+ }
+}
+
+struct commit *get_revision(struct rev_info *revs)
+{
+ struct commit_list *list = revs->commits;
+
+ if (!list)
+ return NULL;
+
+ /* Check the max_count ... */
+ switch (revs->max_count) {
+ case -1:
+ break;
+ case 0:
+ return NULL;
+ default:
+ revs->max_count--;
+ }
+
+ do {
+ struct commit *commit = revs->commits->item;
+
+ if (commit->object.flags & (UNINTERESTING|SHOWN))
+ goto next;
+ if (revs->min_age != -1 && (commit->date > revs->min_age))
+ goto next;
+ if (revs->max_age != -1 && (commit->date < revs->max_age))
+ return NULL;
+ if (revs->no_merges && commit->parents && commit->parents->next)
+ goto next;
+ if (revs->prune_fn && revs->dense) {
+ if (!(commit->object.flags & TREECHANGE))
+ goto next;
+ rewrite_parents(commit);
+ }
+ /* More to go? */
+ if (revs->max_count)
+ pop_most_recent_commit(&revs->commits, SEEN);
+ commit->object.flags |= SHOWN;
+ return commit;
+next:
+ pop_most_recent_commit(&revs->commits, SEEN);
+ } while (revs->commits);
+ return NULL;
+}