prosody
2ac63715ef6f
util/paths.lua

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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
comparison
equal deleted inserted replaced
11182:bab8d01e139a 11183:2ac63715ef6f
35 return "%"..c; 35 return "%"..c;
36 end 36 end
37 end).."$"; 37 end).."$";
38 end 38 end
39 39
40 function path_util.join(...) 40 function path_util.join(a, b, c, ...) -- (... : string) --> string
41 return t_concat({...}, path_sep); 41 -- Optimization: Avoid creating table for most uses
42 if b then
43 if c then
44 if ... then
45 return t_concat({a,b,c,...}, path_sep);
46 end
47 return a..path_sep..b..path_sep..c;
48 end
49 return a..path_sep..b;
50 end
51 return a;
42 end 52 end
43 53
44 function path_util.complement_lua_path(installer_plugin_path) 54 function path_util.complement_lua_path(installer_plugin_path)
45 -- Checking for duplicates 55 -- Checking for duplicates
46 -- The commands using luarocks need the path to the directory that has the /share and /lib folders. 56 -- The commands using luarocks need the path to the directory that has the /share and /lib folders.