function command_files {
    (Get-ChildItem "$PSScriptRoot\..\libexec") + (Get-ChildItem "$scoopdir\shims") |
        Where-Object 'scoop-.*?\.ps1$' -Property Name -Match
}

function commands {
    command_files | ForEach-Object { command_name $_ }
}

function command_name($filename) {
    $filename.name | Select-String 'scoop-(.*?)\.ps1$' | ForEach-Object { $_.matches[0].groups[1].value }
}

function command_path($cmd) {
    $cmd_path = "$PSScriptRoot\..\libexec\scoop-$cmd.ps1"

    # built in commands
    if (!(Test-Path $cmd_path)) {
        # get path from shim
        $shim_path = "$scoopdir\shims\scoop-$cmd.ps1"
        $line = ((Get-Content $shim_path) | Where-Object { $_.startswith('$path') })
        if($line) {
            Invoke-Command ([scriptblock]::Create($line)) -NoNewScope
            $cmd_path = $path
        }
        else { $cmd_path = $shim_path }
    }

    $cmd_path
}

function exec($cmd, $arguments) {
    $cmd_path = command_path $cmd

    & $cmd_path @arguments
}