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merge-ort: add initial outline for basic rename detection 

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren 2020-12-14 16:21:31 +00:00 committed by Junio C Hamano
parent 864075ec43
commit e1a124e8dc
1 changed files with 60 additions and 8 deletions
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68
merge-ort.c
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@ -644,20 +644,72 @@ static int handle_content_merge(struct merge_options *opt,
/*** Function Grouping: functions related to regular rename detection ***/
static int process_renames(struct merge_options *opt,
struct diff_queue_struct *renames)
{
die("Not yet implemented.");
}
static int compare_pairs(const void *a_, const void *b_)
{
die("Not yet implemented.");
}
/* Call diffcore_rename() to compute which files have changed on given side */
static void detect_regular_renames(struct merge_options *opt,
struct tree *merge_base,
struct tree *side,
unsigned side_index)
{
die("Not yet implemented.");
}
/*
* Get information of all renames which occurred in 'side_pairs', discarding
* non-renames.
*/
static int collect_renames(struct merge_options *opt,
struct diff_queue_struct *result,
unsigned side_index)
{
die("Not yet implemented.");
}
static int detect_and_process_renames(struct merge_options *opt,
struct tree *merge_base,
struct tree *side1,
struct tree *side2)
{
int clean = 1;
struct diff_queue_struct combined;
struct rename_info *renames = &opt->priv->renames;
int s, clean = 1;
memset(&combined, 0, sizeof(combined));
detect_regular_renames(opt, merge_base, side1, MERGE_SIDE1);
detect_regular_renames(opt, merge_base, side2, MERGE_SIDE2);
ALLOC_GROW(combined.queue,
renames->pairs[1].nr + renames->pairs[2].nr,
combined.alloc);
clean &= collect_renames(opt, &combined, MERGE_SIDE1);
clean &= collect_renames(opt, &combined, MERGE_SIDE2);
QSORT(combined.queue, combined.nr, compare_pairs);
clean &= process_renames(opt, &combined);
/* Free memory for renames->pairs[] and combined */
for (s = MERGE_SIDE1; s <= MERGE_SIDE2; s++) {
free(renames->pairs[s].queue);
DIFF_QUEUE_CLEAR(&renames->pairs[s]);
}
if (combined.nr) {
int i;
for (i = 0; i < combined.nr; i++)
diff_free_filepair(combined.queue[i]);
free(combined.queue);
}
/*
* Rename detection works by detecting file similarity. Here we use
* a really easy-to-implement scheme: files are similar IFF they have
* the same filename. Therefore, by this scheme, there are no renames.
*
* TODO: Actually implement a real rename detection scheme.
*/
return clean;
}