Re: [PATCH v4 2/4] path: optimize common dir checking

> Instead of a linear search over common_list to check whether
> a path is common, use a trie.  The trie search operates on
> path prefixes, and handles excludes.
> 
> Signed-off-by: David Turner <dturner@twopensource.com>
> ---
>  path.c                | 226 ++++++++++++++++++++++++++++++++++++++++++++++----
>  t/t0060-path-utils.sh |   1 +
>  2 files changed, 213 insertions(+), 14 deletions(-)
> 
> diff --git a/path.c b/path.c

> +		child->len = root->len - i - 1;
> +		if (child->len) {
> +			child->contents = strndup(root->contents + i + 1,
> +						   child->len);
>  		}