Excessive forward slash after path.normpath

[duselguy]

Linux
Lua 5.4.6
penlight 1.15.0-1
local path = require 'pl.path'
print(path.normpath("/foo//")) -- Output is ok: /foo
print(path.normpath("//foo//bar")) -- Output fails (exessive forward slash): //foo/bar
print(path.normpath("//")) -- Output fails (exessive forward slash): //
print(path.normpath("///foo//bar")) -- Output is ok: /foo/bar
print(path.normpath("///")) -- Output is ok: /
print(path.normpath("////foo//bar")) -- Output is ok: /foo/bar
print(path.normpath("////")) -- Output is ok: /
P.S. I don't know how it works in Windows

[duselguy]

In code sample:
exessive => excessive

[Tieske]

this is expected:

https://github.com/lunarmodules/Penlight/blob/master/tests/test-path.lua#L157-L158

[duselguy]

This behavior is not clear:
//// => /
/// => /
// => //
What's the (deep) sense?

[duselguy]

Perl(canonpath): // => /
Python(normpath): // => //
On POSIX (Linux/macOS): A single leading slash / indicates an absolute path. While multiple leading slashes (e.g., ///home/user) are generally treated as a single slash by the OS, normpath might preserve the leading // in some edge cases due to historical POSIX specifications where // could have a special, implementation-defined meaning.

Lua follows Python ...

[alerque]

I suspect this is some attempt to not clobber URL handling, but the actual use case should probably be documented because that test expectation alone doesn't make any sense to me either.

[Tieske]

This is following Python behaviour I presume, similar to split functionality, see #302

[Tieske]

I reopened the issue to consider this for 2.0 (milestone added)