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