141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
#include "cache.h"
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#include "commit.h"
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/*
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* revision.h leaves the low 16 bits of the "flags" field of the
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* revision data structure unused. We use it for a "reachable from
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* this commit <N>" bitmask.
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*/
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#define MAX_COMMITS 16
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#define REACHABLE (1U << 16)
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#define cmit_flags(cmit) ((cmit)->object.flags & ~REACHABLE)
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static int show_edges = 0;
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static int basemask = 0;
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static void read_cache_file(const char *path)
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{
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die("no revtree cache file yet");
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}
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/*
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* Some revisions are less interesting than others.
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*
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* For example, if we use a cache-file, that one may contain
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* revisions that were never used. They are never interesting.
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*
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* And sometimes we're only interested in "edge" commits, ie
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* places where the marking changes between parent and child.
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*/
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static int interesting(struct commit *rev)
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{
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unsigned mask = cmit_flags(rev);
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if (!mask)
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return 0;
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if (show_edges) {
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struct commit_list *p = rev->parents;
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while (p) {
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if (mask != cmit_flags(p->item))
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return 1;
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p = p->next;
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}
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return 0;
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}
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if (mask & basemask)
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return 0;
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return 1;
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}
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/*
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* Usage: git-rev-tree [--edges] [--cache <cache-file>] <commit-id> [<commit-id2>]
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*
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* The cache-file can be quite important for big trees. This is an
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* expensive operation if you have to walk the whole chain of
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* parents in a tree with a long revision history.
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*/
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int main(int argc, char **argv)
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{
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int i;
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int nr = 0;
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unsigned char sha1[MAX_COMMITS][20];
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struct commit_list *list = NULL;
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/*
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* First - pick up all the revisions we can (both from
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* caches and from commit file chains).
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*/
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for (i = 1; i < argc ; i++) {
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char *arg = argv[i];
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struct commit *commit;
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if (!strcmp(arg, "--cache")) {
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read_cache_file(argv[++i]);
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continue;
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}
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if (!strcmp(arg, "--edges")) {
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show_edges = 1;
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continue;
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}
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if (arg[0] == '^') {
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arg++;
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basemask |= 1<<nr;
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}
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if (nr >= MAX_COMMITS || get_sha1(arg, sha1[nr]))
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usage("git-rev-tree [--edges] [--cache <cache-file>] <commit-id> [<commit-id>]");
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commit = lookup_commit_reference(sha1[nr]);
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if (!commit || parse_commit(commit) < 0)
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die("bad commit object");
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commit_list_insert(commit, &list);
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nr++;
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}
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/*
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* Parse all the commits in date order.
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*
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* We really should stop once we know enough, but that's a
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* decision that isn't trivial to make.
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*/
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while (list)
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pop_most_recent_commit(&list, REACHABLE);
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/*
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* Now we have the maximal tree. Walk the different sha files back to the root.
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*/
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for (i = 0; i < nr; i++)
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mark_reachable(&lookup_commit_reference(sha1[i])->object, 1 << i);
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/*
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* Now print out the results..
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*/
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for (i = 0; i < nr_objs; i++) {
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struct object *obj = objs[i];
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struct commit *commit;
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struct commit_list *p;
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if (obj->type != commit_type)
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continue;
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commit = (struct commit *) obj;
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if (!interesting(commit))
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continue;
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printf("%lu %s:%d", commit->date, sha1_to_hex(obj->sha1),
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cmit_flags(commit));
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p = commit->parents;
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while (p) {
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printf(" %s:%d", sha1_to_hex(p->item->object.sha1),
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cmit_flags(p->item));
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p = p->next;
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}
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printf("\n");
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}
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return 0;
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}
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