extname
function extname( path ) --> ext
Description
Returns the file name extension used by path. The extension is the suffix beginning at the final dot in the final slash-separated element of path.
Parameters
- path
-
Path with file name.
Return Values
- ext
-
File name extension.
Code
--ZFUNC-extname-v1 local function extname( path ) --> ext local i = #path local c = string.sub( path, i, i ) while i > 0 and c ~= "." do i = i - 1 c = string.sub( path, i, i ) if c == "/" then return "" end end if i == 0 then return "" end -- empty path return string.sub( path, i ) end return extname
Examples
local t = require( "tapered" ) local extname = require( "extname" ) t.is( ".html", extname( "index.html" ) ) t.is( ".md", extname( "index.coffee.md" ) ) t.is( ".", extname( "index.." ) ) t.is( "", extname( "index" ) ) t.is( ".index", extname( ".index" ) ) t.is( ".index", extname( "/.index" ) ) t.is( "", extname( "abc.def/index" ) ) t.done()