tree-diff: do not assume we use only one pathspec

The way tree-diff was set up assumed we would use only one set
of pathspec during the entire life of the program.  Move the
pathspec related static variables out to diff_options structure
so that we can filter commits with one set of paths while show
the actual diffs using different set of paths.

I suspect this breaks blame.c, and makes "git log paths..." to
default to the --full-diff, the latter of which is dealt with
the next commit.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/diff.h b/diff.h
index a02ef2820..cc7cc627c 100644
--- a/diff.h
+++ b/diff.h
@@ -38,11 +38,15 @@ struct diff_options {
 	int setup;
 	int abbrev;
 
+	int nr_paths;
+	const char **paths;
+	int *pathlens;
 	change_fn_t change;
 	add_remove_fn_t add_remove;
 };
 
-extern void diff_tree_setup_paths(const char **paths);
+extern void diff_tree_setup_paths(const char **paths, struct diff_options *);
+extern void diff_tree_release_paths(struct diff_options *);
 extern int diff_tree(struct tree_desc *t1, struct tree_desc *t2,
 		     const char *base, struct diff_options *opt);
 extern int diff_tree_sha1(const unsigned char *old, const unsigned char *new,