combine-diff: add a bit more comments.

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

diff --git a/combine-diff.c b/combine-diff.c
index 36363bd..a698475 100644 (file)
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -68,6 +68,7 @@ static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr,
        return curr;
 }
 
+/* Lines lost from parent */
 struct lline {
        struct lline *next;
        int len;
@@ -75,10 +76,15 @@ struct lline {
        char line[FLEX_ARRAY];
 };
 
+/* Lines surviving in the merge result */
 struct sline {
        struct lline *lost_head, **lost_tail;
        char *bol;
        int len;
+       /* bit 0 up to (N-1) are on if the parent does _not_
+        * have this line (i.e. we changed it).
+        * bit N is used for "interesting" lines, including context.
+        */
        unsigned long flag;
 };
 
@@ -242,7 +248,7 @@ static void combine_diff(const unsigned char *parent, const char *ourtmp,
                        continue;
                }
                if (!lost_bucket)
-                       continue;
+                       continue; /* not in any hunk yet */
                switch (line[0]) {
                case '-':
                        append_lost(lost_bucket, n, line+1);