Powershell fish prompt

prompt.ps1

function replaceHome($pathArray) {
    # Check whether the first three paths are equal to HOME
    # If it is, it substitutes it for ~
    # Change this accordingly, if your home path is more than three 
    # paths long.
    $splitChar = [System.IO.Path]::DirectorySeparatorChar
    if ( ($pathArray.Length -gt 2) -and
        (($pathArray[0..2] -join $splitChar) -eq $HOME)) {
        @("~") + $pathArray[3..$pathArray.Length]
    }
    else {
        $pathArray
    }
}
function fish_prompt {
    $splitChar = [System.IO.Path]::DirectorySeparatorChar
    $currLocation = (Get-Location)
    if ($currLocation.ToString() -eq $HOME) {
        # Special case the home directory
        "~>"
    }
    else {
        $current = Split-Path -Leaf -Path $currLocation
        $parent = Split-Path -Parent -Path $currLocation
        $folders = $parent.Split($splitChar, [System.StringSplitOptions]::RemoveEmptyEntries)
        if ($folders.Length -lt 2) {
            # If the path is 0 or 1, then ignore.
            $currLocation.ToString() + ">"
        }
        else {
            $folders = replaceHome($folders) # optional, to get the ~/Docs effect
            # Replace everything except the first name
            # Note: On line 35, (+) for array concat avoids issue of empty arr
            $firstNameFolders = ForEach ($f in $folders[1..$folders.Length]) { $f[0] }
            $folders = @($folders[0]) + $firstNameFolders + @($current)
            ($folders -join $splitChar) + ">"
        }
    }
}
function prompt {
    fish_prompt
}

EDIT Jun 29, 2020: Minor changes to cache (Get-Location), and use the -Join operator instead of the .NET string join.