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revision.c: --full-history fix.

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With history simplification, we still show merges that are required
to make the history _complete_, i.e. say that you had:

	  a
	  |
	  b
	 / \
	c   d
	|   |

and neither "a" nor "b" actually changed the file, but both "c" and "d"
did: in this case we have to leave "b" around just because otherwise there
would be no way to show the _relationship_, even if "b" itself doesn't
actually change the tree in any way what-so-ever.

It would make sense to make that further simplification if the
"--parents" flag wasn't present.  In that case the user is
literally asking for a list of commits and is not interested in
the relationship between them.

This patch also fixes a real bug.  Without this patch, the
"--parents --full-history" combination (which you'd get if you
do something like

	gitk --full-history Makefile

or similar) will actually _drop_ merges where all children are identical.
That's wrong in the --full-history case, because it means that the graph
ends up missing lots of entries.

In the process, this also should make

	git-rev-list --full-history Makefile

give just the _true_ list of all commits that changed Makefile (and
properly ignore merges that were identical in one parent), because now
we're not asking for "--parent", so we don't need the unnecessary merge
commits to keep the history together.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Linus Torvalds 2006-06-30 20:21:59 -07:00 committed by Junio C Hamano
parent ac3bc6c1d1
commit 6631c73685
1 changed files with 14 additions and 4 deletions
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16
revision.c
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@ -280,7 +280,7 @@ int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
{
struct commit_list **pp, *parent;
int tree_changed = 0;
int tree_changed = 0, tree_same = 0;
if (!commit->tree)
return;
@ -298,6 +298,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
parse_commit(p);
switch (rev_compare_tree(revs, p->tree, commit->tree)) {
case REV_TREE_SAME:
tree_same = 1;
if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
/* Even if a merge with an uninteresting
* side branch brought the entire change
@ -334,7 +335,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
}
die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
}
if (tree_changed)
if (tree_changed && !tree_same)
commit->object.flags |= TREECHANGE;
}
@ -896,6 +897,8 @@ static int rewrite_one(struct rev_info *revs, struct commit **pp)
struct commit *p = *pp;
if (!revs->limited)
add_parents_to_list(revs, p, &revs->commits);
if (p->parents && p->parents->next)
return 0;
if (p->object.flags & (TREECHANGE | UNINTERESTING))
return 0;
if (!p->parents)
@ -988,8 +991,15 @@ struct commit *get_revision(struct rev_info *revs)
commit->parents && commit->parents->next)
continue;
if (revs->prune_fn && revs->dense) {
if (!(commit->object.flags & TREECHANGE))
/* Commit without changes? */
if (!(commit->object.flags & TREECHANGE)) {
/* drop merges unless we want parenthood */
if (!revs->parents)
continue;
/* non-merge - always ignore it */
if (commit->parents && !commit->parents->next)
continue;
}
if (revs->parents)
rewrite_parents(revs, commit);
}