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-rw-r--r--diffcore-rename.c40
1 files changed, 36 insertions, 4 deletions
diff --git a/diffcore-rename.c b/diffcore-rename.c
index 6a52699..dbc8522 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -55,12 +55,12 @@ static struct diff_rename_dst *locate_rename_dst(struct diff_filespec *two,
/* Table of rename/copy src files */
static struct diff_rename_src {
struct diff_filespec *one;
- unsigned src_stays : 1;
+ unsigned src_path_left : 1;
} *rename_src;
static int rename_src_nr, rename_src_alloc;
static struct diff_rename_src *register_rename_src(struct diff_filespec *one,
- int src_stays)
+ int src_path_left)
{
int first, last;
@@ -90,7 +90,7 @@ static struct diff_rename_src *register_rename_src(struct diff_filespec *one,
memmove(rename_src + first + 1, rename_src + first,
(rename_src_nr - first - 1) * sizeof(*rename_src));
rename_src[first].one = one;
- rename_src[first].src_stays = src_stays;
+ rename_src[first].src_path_left = src_path_left;
return &(rename_src[first]);
}
@@ -220,7 +220,7 @@ static void record_rename_pair(struct diff_queue_struct *renq,
dp = diff_queue(renq, one, two);
dp->score = score;
- dp->source_stays = rename_src[src_index].src_stays;
+ dp->source_stays = rename_src[src_index].src_path_left;
rename_dst[dst_index].pair = dp;
}
@@ -234,6 +234,21 @@ static int score_compare(const void *a_, const void *b_)
return b->score - a->score;
}
+static int compute_stays(struct diff_queue_struct *q,
+ struct diff_filespec *one)
+{
+ int i;
+ for (i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+ if (strcmp(one->path, p->two->path))
+ continue;
+ if (DIFF_PAIR_RENAME(p)) {
+ return 0; /* something else is renamed into this */
+ }
+ }
+ return 1;
+}
+
void diffcore_rename(int detect_rename, int minimum_score)
{
struct diff_queue_struct *q = &diff_queued_diff;
@@ -406,6 +421,23 @@ void diffcore_rename(int detect_rename, int minimum_score)
*q = outq;
diff_debug_queue("done collapsing", q);
+ /* We need to see which rename source really stays here;
+ * earlier we only checked if the path is left in the result,
+ * but even if a path remains in the result, if that is coming
+ * from copying something else on top of it, then the original
+ * source is lost and does not stay.
+ */
+ for (i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+ if (DIFF_PAIR_RENAME(p) && p->source_stays) {
+ /* If one appears as the target of a rename-copy,
+ * then mark p->source_stays = 0; otherwise
+ * leave it as is.
+ */
+ p->source_stays = compute_stays(q, p->one);
+ }
+ }
+
free(rename_dst);
rename_dst = NULL;
rename_dst_nr = rename_dst_alloc = 0;