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Idiom #151 Remove string trailing path separator

Remove last character from string p, if this character is the file path separator of current platform.

Note that this also transforms unix root path "/" into the empty string!

import Data.List (dropWhileEnd)
import System.FilePath (pathSeparator)
p' = dropWhileEnd (== pathSeparator) p
using System.IO;
p.TrimEnd(Path.DirectorySeparatorChar);

import std.string,
import std.path;
p = p.chomp(dirSeparator);
import 'package:path/path.dart' as path;
if (p.endsWith(path.separator)) p = p.substring(0, p.length - 1);
import "fmt"
import "path/filepath"
import "strings"
sep := fmt.Sprintf("%c", filepath.Separator)
p = strings.TrimSuffix(p, sep)
import "fmt"
import "os"
import "strings"
sep := fmt.Sprintf("%c", os.PathSeparator)
p = strings.TrimSuffix(p, sep)
import * as path from 'path'
p = p.endsWith(path.sep) ? p.slice(0, -path.sep.length) : p
if string.sub(p, -1, -1) == "/" then
	p=string.sub(p, 1, -2)
end
uses SysUtils;
begin
  p := ExcludeTrailingPathDelimiter(p);
end.
uses LazFileUtils;
begin
  p := ChompPathDelim(p);
end.
use File::Spec qw();
chomp $p, File::Spec->catdir('');
import os
if p.endswith(os.sep):
    p = p[:-1]
p.chomp!("/")
let p = if ::std::path::is_separator(p.chars().last().unwrap()) {
    &p[0..p.len()-1]
} else {
    p
};
p = p.strip_suffix(std::path::is_separator).unwrap_or(p);
New implementation...
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programming-idioms.org 
p' = dropWhileEnd (== pathSeparator) p
p.TrimEnd(Path.DirectorySeparatorChar);

p = p.chomp(dirSeparator);
if (p.endsWith(path.separator)) p = p.substring(0, p.length - 1);
sep := fmt.Sprintf("%c", filepath.Separator)
p = strings.TrimSuffix(p, sep)
sep := fmt.Sprintf("%c", os.PathSeparator)
p = strings.TrimSuffix(p, sep)
p = p.endsWith(path.sep) ? p.slice(0, -path.sep.length) : p
if string.sub(p, -1, -1) == "/" then
	p=string.sub(p, 1, -2)
end
begin
  p := ExcludeTrailingPathDelimiter(p);
end.
begin
  p := ChompPathDelim(p);
end.
chomp $p, File::Spec->catdir('');
if p.endswith(os.sep):
    p = p[:-1]
p.chomp!("/")
let p = if ::std::path::is_separator(p.chars().last().unwrap()) {
    &p[0..p.len()-1]
} else {
    p
};
p = p.strip_suffix(std::path::is_separator).unwrap_or(p);