Lazily open pack index files on demand

diff --git a/tree-diff.c b/tree-diff.c
index 15fd665fb827bfa6ebc9254b5eab142e7d261718..852498eb49fe0cba5e1cd21661288e8321a4b20e 100644 (file)
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -70,7 +70,8 @@ static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2, const
  * Is a tree entry interesting given the pathspec we have?
  *
  * Return:
- *  - positive for yes
+ *  - 2 for "yes, and all subsequent entries will be"
+ *  - 1 for yes
  *  - zero for no
  *  - negative for "no, and no subsequent entries will be either"
  */
@@ -100,8 +101,11 @@ static int tree_entry_interesting(struct tree_desc *desc, const char *base, int
                        if (strncmp(base, match, matchlen))
                                continue;
 
-                       /* The base is a subdirectory of a path which was specified. */
-                       return 1;
+                       /*
+                        * The base is a subdirectory of a path which
+                        * was specified, so all of them are interesting.
+                        */
+                       return 2;
                }
 
                /* Does the base match? */
@@ -173,8 +177,18 @@ static int tree_entry_interesting(struct tree_desc *desc, const char *base, int
 /* A whole sub-tree went away or appeared */
 static void show_tree(struct diff_options *opt, const char *prefix, struct tree_desc *desc, const char *base, int baselen)
 {
+       int all_interesting = 0;
        while (desc->size) {
-               int show = tree_entry_interesting(desc, base, baselen, opt);
+               int show;
+
+               if (all_interesting)
+                       show = 1;
+               else {
+                       show = tree_entry_interesting(desc, base, baselen,
+                                                     opt);
+                       if (show == 2)
+                               all_interesting = 1;
+               }
                if (show < 0)
                        break;
                if (show)
@@ -215,8 +229,17 @@ static void show_entry(struct diff_options *opt, const char *prefix, struct tree
 
 static void skip_uninteresting(struct tree_desc *t, const char *base, int baselen, struct diff_options *opt)
 {
+       int all_interesting = 0;
        while (t->size) {
-               int show = tree_entry_interesting(t, base, baselen, opt);
+               int show;
+
+               if (all_interesting)
+                       show = 1;
+               else {
+                       show = tree_entry_interesting(t, base, baselen, opt);
+                       if (show == 2)
+                               all_interesting = 1;
+               }
                if (!show) {
                        update_tree_entry(t);
                        continue;