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PHPで書かれたGordonからの答えを見つけました: PHPの絶対パスから相対パスを取得します。
これがPowerShellへの私の移植です:
<# This is probably not the best code I've ever written, but
I think it should be readable for most (advanced) users.
I will wrap this function into a Cmdlet when I have time to do it.
Feel free to edit this answer and improve it!
#>
function getRelativePath([string]$from, [string]$to, [string]$joinSlash='/') {
$from = $from -replace "(\\)", "/";
$to = $to -replace "(\\)", "/";
$fromArr = New-Object System.Collections.ArrayList;
$fromArr.AddRange($from.Split("/"));
$relPath = New-Object System.Collections.ArrayList;
$relPath.AddRange($to.Split("/"));
$toArr = New-Object System.Collections.ArrayList;
$toArr.AddRange($to.Split("/"));
for ($i=0; $i -lt $fromArr.Count; $i++) {
$dir = $fromArr[$i];
# Find first non-matching directory
if ($dir.Equals($toArr[$i])) {
# ignore this directory
$relPath.RemoveAt(0);
}
else {
# Get number of remaining directories to $from
$remaining = $fromArr.Count - $i;
if ($remaining -gt 1) {
# Add traversals up to first matching directory
$padLength = ($relPath.Count + $remaining - 1);
# Emulate array_pad() from PHP
for (; $relPath.Count -ne ($padLength);) {
$relPath.Insert(0, "..");
}
break;
}
else {
$relPath[0] = "./" + $relPath[0];
}
}
}
return $relPath -Join $joinSlash;
}
注意:-You
Fromパスはスラッシュで終了する必要があります!
例
getRelativePath -From "P:/SO/team/lists/" -To "P:/SO/data/database.txt";
--> ../../data/database.txt
getRelativePath -From "C:/Windows/System32/" -To "C:/Users/ComFreek/Desktop/SO.txt";
--> ../../Users/ComFreek/Desktop/SO.txt