Software / code / prosody
Diff
util/paths.lua @ 11183:2ac63715ef6f
util.paths: Optimize path joining with few arguments
A casual search suggests that the majority of paths.join() calls involve
only two arguments. This saves the creation of a table for up to 3
arguments.
Looks like 3x faster for 3 arguments or less, 5% slower when it uses the
array to concatenate.
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Sun, 11 Oct 2020 23:04:13 +0200 |
| parent | 10402:0971694b30a8 |
line wrap: on
line diff
--- a/util/paths.lua Sat Oct 17 19:24:44 2020 +0200 +++ b/util/paths.lua Sun Oct 11 23:04:13 2020 +0200 @@ -37,8 +37,18 @@ end).."$"; end -function path_util.join(...) - return t_concat({...}, path_sep); +function path_util.join(a, b, c, ...) -- (... : string) --> string + -- Optimization: Avoid creating table for most uses + if b then + if c then + if ... then + return t_concat({a,b,c,...}, path_sep); + end + return a..path_sep..b..path_sep..c; + end + return a..path_sep..b; + end + return a; end function path_util.complement_lua_path(installer_plugin_path)
