Clean-up trivially redundant diff.

diff --git a/diffcore-rename.c b/diffcore-rename.c
index ffd126af0d2cd3539e0f186e83c7671132758e6b..e99269872026c7f08e729acb6ffba7ef3c9c8fd8 100644 (file)
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -4,8 +4,6 @@
 #include "cache.h"
 #include "diff.h"
 #include "diffcore.h"
-#include "delta.h"
-#include "count-delta.h"
 
 /* Table of rename/copy destinations */
 
@@ -135,8 +133,7 @@ static int estimate_similarity(struct diff_filespec *src,
         * match than anything else; the destination does not even
         * call into this function in that case.
         */
-       void *delta;
-       unsigned long delta_size, base_size, src_copied, literal_added;
+       unsigned long max_size, delta_size, base_size, src_copied, literal_added;
        unsigned long delta_limit;
        int score;
 
@@ -147,9 +144,9 @@ static int estimate_similarity(struct diff_filespec *src,
        if (!S_ISREG(src->mode) || !S_ISREG(dst->mode))
                return 0;
 
-       delta_size = ((src->size < dst->size) ?
-                     (dst->size - src->size) : (src->size - dst->size));
+       max_size = ((src->size > dst->size) ? src->size : dst->size);
        base_size = ((src->size < dst->size) ? src->size : dst->size);
+       delta_size = max_size - base_size;
 
        /* We would not consider edits that change the file size so
         * drastically.  delta_size must be smaller than
@@ -165,42 +162,22 @@ static int estimate_similarity(struct diff_filespec *src,
        if (diff_populate_filespec(src, 0) || diff_populate_filespec(dst, 0))
                return 0; /* error but caught downstream */
 
+
        delta_limit = base_size * (MAX_SCORE-minimum_score) / MAX_SCORE;
-       delta = diff_delta(src->data, src->size,
-                          dst->data, dst->size,
-                          &delta_size, delta_limit);
-       if (!delta)
-               /* If delta_limit is exceeded, we have too much differences */
+       if (diffcore_count_changes(src->data, src->size,
+                                  dst->data, dst->size,
+                                  &src->cnt_data, &dst->cnt_data,
+                                  delta_limit,
+                                  &src_copied, &literal_added))
                return 0;
 
-       /* A delta that has a lot of literal additions would have
-        * big delta_size no matter what else it does.
+       /* How similar are they?
+        * what percentage of material in dst are from source?
         */
-       if (base_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE) {
-               free(delta);
-               return 0;
-       }
-
-       /* Estimate the edit size by interpreting delta. */
-       if (count_delta(delta, delta_size, &src_copied, &literal_added)) {
-               free(delta);
-               return 0;
-       }
-       free(delta);
-
-       /* Extent of damage */
-       if (src->size + literal_added < src_copied)
-               delta_size = 0;
+       if (!dst->size)
+               score = 0; /* should not happen */
        else
-               delta_size = (src->size - src_copied) + literal_added;
-
-       /*
-        * Now we will give some score to it.  100% edit gets 0 points
-        * and 0% edit gets MAX_SCORE points.
-        */
-       score = MAX_SCORE - (MAX_SCORE * delta_size / base_size); 
-       if (score < 0) return 0;
-       if (MAX_SCORE < score) return MAX_SCORE;
+               score = src_copied * MAX_SCORE / max_size;
        return score;
 }
 
@@ -328,6 +305,8 @@ void diffcore_rename(struct diff_options *options)
                        m->score = estimate_similarity(one, two,
                                                       minimum_score);
                }
+               /* We do not need the text anymore */
+               diff_free_filespec_data(two);
                dst_cnt++;
        }
        /* cost matrix sorted by most to least similar pair */