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diffcore-rename: limit dir_rename_counts computation to relevant dirs 

We are using dir_rename_counts to count the number of other directories
that files within a directory moved to.  We only need this information
for directories that disappeared, though, so we can return early from
update_dir_rename_counts() for other paths.

If dirs_removed is passed to diffcore_rename_extended(), then it
provides the relevant bits of information for us to limit this counting
to relevant dirs.  If dirs_removed is not passed, we would need to
compute some replacement in order to do this limiting.  Introduce a new
info->relevant_source_dirs variable for this purpose, even though at
this stage we will only set it to dirs_removed for simplicity.

Reviewed-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Elijah Newren 2021-02-27 00:30:47 +00:00 committed by Junio C Hamano
parent 1ad69eb0dc
commit 333899e1e3
1 changed files with 10 additions and 0 deletions
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10
diffcore-rename.c
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@ -371,6 +371,7 @@ struct dir_rename_info {
struct strintmap idx_map;
struct strmap dir_rename_guess;
struct strmap *dir_rename_count;
struct strset *relevant_source_dirs;
unsigned setup;
};

@ -442,7 +443,13 @@ static void update_dir_rename_counts(struct dir_rename_info *info,
return;

while (1) {
/* Get old_dir, skip if its directory isn't relevant. */
dirname_munge(old_dir);
if (info->relevant_source_dirs &&
!strset_contains(info->relevant_source_dirs, old_dir))
break;

/* Get new_dir */
dirname_munge(new_dir);

/*
@ -521,6 +528,9 @@ static void initialize_dir_rename_info(struct dir_rename_info *info,
strintmap_init_with_options(&info->idx_map, -1, NULL, 0);
strmap_init_with_options(&info->dir_rename_guess, NULL, 0);

/* Setup info->relevant_source_dirs */
info->relevant_source_dirs = dirs_removed;

/*
* Loop setting up both info->idx_map, and doing setup of
* info->dir_rename_count.