36f8d17445
Now you can give git-rev-list tags, trees and blobs, and it will do the proper reachability for them all. Knock wood. Of course, you need the "--objects" flag to do anything but plain commits.
488 lines
11 KiB
C
488 lines
11 KiB
C
#include "cache.h"
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#include "tag.h"
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#include "commit.h"
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#include "tree.h"
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#include "blob.h"
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#include "epoch.h"
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#define SEEN (1u << 0)
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#define INTERESTING (1u << 1)
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#define COUNTED (1u << 2)
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#define SHOWN (LAST_EPOCH_FLAG << 2)
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static const char rev_list_usage[] =
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"usage: git-rev-list [OPTION] commit-id <commit-id>\n"
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" --max-count=nr\n"
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" --max-age=epoch\n"
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" --min-age=epoch\n"
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" --header\n"
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" --pretty\n"
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" --merge-order [ --show-breaks ]";
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static int bisect_list = 0;
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static int tag_objects = 0;
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static int tree_objects = 0;
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static int blob_objects = 0;
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static int verbose_header = 0;
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static int show_parents = 0;
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static int hdr_termination = 0;
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static const char *prefix = "";
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static unsigned long max_age = -1;
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static unsigned long min_age = -1;
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static int max_count = -1;
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static enum cmit_fmt commit_format = CMIT_FMT_RAW;
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static int merge_order = 0;
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static int show_breaks = 0;
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static int stop_traversal = 0;
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static void show_commit(struct commit *commit)
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{
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commit->object.flags |= SHOWN;
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if (show_breaks) {
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prefix = "| ";
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if (commit->object.flags & DISCONTINUITY) {
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prefix = "^ ";
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} else if (commit->object.flags & BOUNDARY) {
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prefix = "= ";
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}
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}
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printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
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if (show_parents) {
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struct commit_list *parents = commit->parents;
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while (parents) {
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printf(" %s", sha1_to_hex(parents->item->object.sha1));
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parents = parents->next;
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}
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}
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putchar('\n');
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if (verbose_header) {
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static char pretty_header[16384];
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pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
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printf("%s%c", pretty_header, hdr_termination);
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}
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}
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static int filter_commit(struct commit * commit)
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{
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if (merge_order && stop_traversal && commit->object.flags & BOUNDARY)
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return STOP;
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if (commit->object.flags & (UNINTERESTING|SHOWN))
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return CONTINUE;
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if (min_age != -1 && (commit->date > min_age))
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return CONTINUE;
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if (max_age != -1 && (commit->date < max_age)) {
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if (!merge_order)
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return STOP;
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else {
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stop_traversal = 1;
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return CONTINUE;
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}
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}
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if (max_count != -1 && !max_count--)
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return STOP;
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return DO;
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}
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static int process_commit(struct commit * commit)
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{
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int action=filter_commit(commit);
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if (action == STOP) {
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return STOP;
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}
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if (action == CONTINUE) {
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return CONTINUE;
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}
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show_commit(commit);
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return CONTINUE;
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}
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static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
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{
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struct object_list *entry = xmalloc(sizeof(*entry));
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entry->item = obj;
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entry->next = *p;
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entry->name = name;
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*p = entry;
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return &entry->next;
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}
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static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
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{
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struct object *obj = &blob->object;
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if (!blob_objects)
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return p;
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if (obj->flags & (UNINTERESTING | SEEN))
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return p;
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obj->flags |= SEEN;
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return add_object(obj, p, name);
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}
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static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
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{
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struct object *obj = &tree->object;
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struct tree_entry_list *entry;
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if (!tree_objects)
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return p;
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if (obj->flags & (UNINTERESTING | SEEN))
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return p;
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if (parse_tree(tree) < 0)
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die("bad tree object %s", sha1_to_hex(obj->sha1));
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obj->flags |= SEEN;
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p = add_object(obj, p, name);
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for (entry = tree->entries ; entry ; entry = entry->next) {
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if (entry->directory)
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p = process_tree(entry->item.tree, p, entry->name);
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else
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p = process_blob(entry->item.blob, p, entry->name);
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}
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return p;
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}
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static struct object_list *pending_objects = NULL;
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static void show_commit_list(struct commit_list *list)
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{
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struct object_list *objects = NULL, **p = &objects, *pending;
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while (list) {
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struct commit *commit = pop_most_recent_commit(&list, SEEN);
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p = process_tree(commit->tree, p, "");
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if (process_commit(commit) == STOP)
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break;
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}
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for (pending = pending_objects; pending; pending = pending->next) {
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struct object *obj = pending->item;
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const char *name = pending->name;
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if (obj->flags & (UNINTERESTING | SEEN))
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continue;
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if (obj->type == tag_type) {
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obj->flags |= SEEN;
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p = add_object(obj, p, name);
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continue;
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}
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if (obj->type == tree_type) {
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p = process_tree((struct tree *)obj, p, name);
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continue;
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}
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if (obj->type == blob_type) {
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p = process_blob((struct blob *)obj, p, name);
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continue;
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}
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die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
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}
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while (objects) {
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printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
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objects = objects->next;
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}
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}
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static void mark_blob_uninteresting(struct blob *blob)
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{
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if (!blob_objects)
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return;
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if (blob->object.flags & UNINTERESTING)
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return;
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blob->object.flags |= UNINTERESTING;
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}
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static void mark_tree_uninteresting(struct tree *tree)
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{
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struct object *obj = &tree->object;
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struct tree_entry_list *entry;
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if (!tree_objects)
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return;
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if (obj->flags & UNINTERESTING)
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return;
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obj->flags |= UNINTERESTING;
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if (parse_tree(tree) < 0)
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die("bad tree %s", sha1_to_hex(obj->sha1));
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entry = tree->entries;
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while (entry) {
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if (entry->directory)
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mark_tree_uninteresting(entry->item.tree);
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else
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mark_blob_uninteresting(entry->item.blob);
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entry = entry->next;
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}
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}
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static void mark_parents_uninteresting(struct commit *commit)
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{
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struct commit_list *parents = commit->parents;
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if (tree_objects)
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mark_tree_uninteresting(commit->tree);
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while (parents) {
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struct commit *commit = parents->item;
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commit->object.flags |= UNINTERESTING;
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parents = parents->next;
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}
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}
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static int everybody_uninteresting(struct commit_list *list)
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{
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while (list) {
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struct commit *commit = list->item;
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list = list->next;
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if (commit->object.flags & UNINTERESTING)
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continue;
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return 0;
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}
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return 1;
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}
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/*
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* This is a truly stupid algorithm, but it's only
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* used for bisection, and we just don't care enough.
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*
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* We care just barely enough to avoid recursing for
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* non-merge entries.
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*/
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static int count_distance(struct commit_list *entry)
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{
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int nr = 0;
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while (entry) {
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struct commit *commit = entry->item;
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struct commit_list *p;
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if (commit->object.flags & (UNINTERESTING | COUNTED))
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break;
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nr++;
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commit->object.flags |= COUNTED;
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p = commit->parents;
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entry = p;
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if (p) {
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p = p->next;
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while (p) {
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nr += count_distance(p);
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p = p->next;
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}
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}
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}
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return nr;
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}
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static void clear_distance(struct commit_list *list)
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{
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while (list) {
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struct commit *commit = list->item;
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commit->object.flags &= ~COUNTED;
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list = list->next;
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}
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}
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static struct commit_list *find_bisection(struct commit_list *list)
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{
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int nr, closest;
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struct commit_list *p, *best;
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nr = 0;
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p = list;
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while (p) {
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nr++;
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p = p->next;
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}
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closest = 0;
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best = list;
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p = list;
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while (p) {
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int distance = count_distance(p);
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clear_distance(list);
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if (nr - distance < distance)
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distance = nr - distance;
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if (distance > closest) {
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best = p;
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closest = distance;
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}
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p = p->next;
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}
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if (best)
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best->next = NULL;
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return best;
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}
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struct commit_list *limit_list(struct commit_list *list)
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{
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struct commit_list *newlist = NULL;
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struct commit_list **p = &newlist;
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while (list) {
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struct commit *commit = pop_most_recent_commit(&list, SEEN);
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struct object *obj = &commit->object;
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if (obj->flags & UNINTERESTING) {
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mark_parents_uninteresting(commit);
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if (everybody_uninteresting(list))
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break;
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continue;
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}
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p = &commit_list_insert(commit, p)->next;
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}
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if (bisect_list)
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newlist = find_bisection(newlist);
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return newlist;
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}
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static void add_pending_object(struct object *obj, const char *name)
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{
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add_object(obj, &pending_objects, name);
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}
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static struct commit *get_commit_reference(const char *name, unsigned int flags)
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{
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unsigned char sha1[20];
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struct object *object;
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if (get_sha1(name, sha1))
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usage(rev_list_usage);
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object = parse_object(sha1);
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if (!object)
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die("bad object %s", name);
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/*
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* Tag object? Look what it points to..
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*/
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if (object->type == tag_type) {
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struct tag *tag = (struct tag *) object;
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object->flags |= flags;
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if (tag_objects && !(object->flags & UNINTERESTING))
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add_pending_object(object, tag->tag);
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object = tag->tagged;
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}
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/*
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* Commit object? Just return it, we'll do all the complex
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* reachability crud.
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*/
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if (object->type == commit_type) {
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struct commit *commit = (struct commit *)object;
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object->flags |= flags;
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if (parse_commit(commit) < 0)
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die("unable to parse commit %s", name);
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return commit;
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}
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/*
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* Tree object? Either mark it uniniteresting, or add it
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* to the list of objects to look at later..
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*/
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if (object->type == tree_type) {
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struct tree *tree = (struct tree *)object;
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if (!tree_objects)
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die("%s is a tree object, not a commit", name);
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if (flags & UNINTERESTING) {
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mark_tree_uninteresting(tree);
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return NULL;
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}
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add_pending_object(object, "");
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return NULL;
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}
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/*
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* Blob object? You know the drill by now..
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*/
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if (object->type == blob_type) {
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struct blob *blob = (struct blob *)object;
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if (!blob_objects)
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die("%s is a blob object, not a commit", name);
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if (flags & UNINTERESTING) {
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mark_blob_uninteresting(blob);
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return NULL;
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}
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add_pending_object(object, "");
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return NULL;
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}
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die("%s is unknown object", name);
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}
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int main(int argc, char **argv)
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{
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struct commit_list *list = NULL;
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int i, limited = 0;
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for (i = 1 ; i < argc; i++) {
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int flags;
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char *arg = argv[i];
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struct commit *commit;
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if (!strncmp(arg, "--max-count=", 12)) {
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max_count = atoi(arg + 12);
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continue;
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}
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if (!strncmp(arg, "--max-age=", 10)) {
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max_age = atoi(arg + 10);
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continue;
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}
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if (!strncmp(arg, "--min-age=", 10)) {
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min_age = atoi(arg + 10);
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continue;
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}
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if (!strcmp(arg, "--header")) {
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verbose_header = 1;
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continue;
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}
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if (!strncmp(arg, "--pretty", 8)) {
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commit_format = get_commit_format(arg+8);
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verbose_header = 1;
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hdr_termination = '\n';
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prefix = "commit ";
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continue;
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}
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if (!strcmp(arg, "--parents")) {
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show_parents = 1;
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continue;
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}
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if (!strcmp(arg, "--bisect")) {
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bisect_list = 1;
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continue;
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}
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if (!strcmp(arg, "--objects")) {
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tag_objects = 1;
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tree_objects = 1;
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blob_objects = 1;
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continue;
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}
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if (!strncmp(arg, "--merge-order", 13)) {
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merge_order = 1;
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continue;
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}
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if (!strncmp(arg, "--show-breaks", 13)) {
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show_breaks = 1;
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continue;
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}
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flags = 0;
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if (*arg == '^') {
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flags = UNINTERESTING;
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arg++;
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limited = 1;
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}
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if (show_breaks && !merge_order)
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usage(rev_list_usage);
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commit = get_commit_reference(arg, flags);
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if (!commit)
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continue;
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commit_list_insert(commit, &list);
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}
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if (!merge_order) {
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if (limited)
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list = limit_list(list);
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show_commit_list(list);
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} else {
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if (sort_list_in_merge_order(list, &process_commit)) {
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die("merge order sort failed\n");
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}
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}
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return 0;
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}
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