Second return parameter from string.gsub is a gotcha
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- Subject: Second return parameter from string.gsub is a gotcha
- From: Dirk Laurie <dirk.laurie@...>
- Date: 2014年3月29日 12:34:45 +0200
I was about to file a bug report (the file name gives that away)
but caught on just in time.
…/tmp$ cat case1.lua
path = "/home/dirk/test/EXT/?.EXT;./?.EXT"
name = 'lua53'
ext = 'bug'
version, msg = package.searchpath (name, path:gsub("EXT",ext))
print(version,msg)
Fails!
…/tmp$ lua case1.lua
nil
no file '/home/dirk/test/bug/lua5/.bug'
no file './lua5/.bug'
But ...
…/tmp$ cat case2.lua
path = "/home/dirk/test/EXT/?.EXT;./?.EXT"
name = 'lua53'
ext = 'bug'
path = path:gsub("EXT",ext)
version, msg = package.searchpath (name, path)
print(version,msg)
Works!
…/tmp$ lua case2.lua
/home/dirk/test/bug/lua53.bug nil
Check: change path:gsub(...) to (path:gsub(...)) in case1, it works.