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Programming-Idioms

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!
New implementation

Be concise.

Be useful.

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Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
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 Data.List (dropWhileEnd)
import System.FilePath (pathSeparator)
p' = dropWhileEnd (== pathSeparator) p
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 LazFileUtils;
begin
  p := ChompPathDelim(p);
end.
uses SysUtils;
begin
  p := ExcludeTrailingPathDelimiter(p);
end.
use File::Spec qw();
chomp $p, File::Spec->catdir('');
import os
if p.endswith(os.sep):
    p = p[:-1]
p.chomp!("/")
p = p.strip_suffix(std::path::is_separator).unwrap_or(p);
let p = if ::std::path::is_separator(p.chars().last().unwrap()) {
    &p[0..p.len()-1]
} else {
    p
};