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merge-ort: add outline of get_provisional_directory_renames()

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This function is based on merge-recursive.c's get_directory_renames(),
except that the first half has been split out into a not-yet-implemented
compute_rename_counts().  The primary difference here is our lack of the
non_unique_new_dir boolean in our strmap.  The lack of that field will
at first cause us to fail testcase 2b of t6423; however, future
optimizations will obviate the need for that ugly field so we have just
left it out.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren 2021-01-19 19:53:41 +00:00 committed by Junio C Hamano
parent 112e11126b
commit 04264d4079
1 changed files with 56 additions and 1 deletions
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57
merge-ort.c
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@ -721,11 +721,66 @@ static int handle_content_merge(struct merge_options *opt,
/*** Function Grouping: functions related to directory rename detection ***/
static void compute_rename_counts(struct diff_queue_struct *pairs,
struct strmap *dir_rename_count,
struct strset *dirs_removed)
{
die("Not yet implemented!");
}
static void get_provisional_directory_renames(struct merge_options *opt,
unsigned side,
int *clean)
{
die("Not yet implemented!");
struct hashmap_iter iter;
struct strmap_entry *entry;
struct rename_info *renames = &opt->priv->renames;
compute_rename_counts(&renames->pairs[side],
&renames->dir_rename_count[side],
&renames->dirs_removed[side]);
/*
* Collapse
* dir_rename_count: old_directory -> {new_directory -> count}
* down to
* dir_renames: old_directory -> best_new_directory
* where best_new_directory is the one with the unique highest count.
*/
strmap_for_each_entry(&renames->dir_rename_count[side], &iter, entry) {
const char *source_dir = entry->key;
struct strintmap *counts = entry->value;
struct hashmap_iter count_iter;
struct strmap_entry *count_entry;
int max = 0;
int bad_max = 0;
const char *best = NULL;
strintmap_for_each_entry(counts, &count_iter, count_entry) {
const char *target_dir = count_entry->key;
intptr_t count = (intptr_t)count_entry->value;
if (count == max)
bad_max = max;
else if (count > max) {
max = count;
best = target_dir;
}
}
if (bad_max == max) {
path_msg(opt, source_dir, 0,
_("CONFLICT (directory rename split): "
"Unclear where to rename %s to; it was "
"renamed to multiple other directories, with "
"no destination getting a majority of the "
"files."),
source_dir);
*clean = 0;
} else {
strmap_put(&renames->dir_renames[side],
source_dir, (void*)best);
}
}
}
static void handle_directory_level_conflicts(struct merge_options *opt)