neat coloured prompt for powershell that shows `user@pcname:pwd\nwinsymbol>` where winsymbol changes between red and green if the last command resulted in an error or no

prompt.Microsoft.PowerShell_profile.ps1

#let the user know the current user, machine, directory, and success status of last command
$Script:prompt = '>'
function Prompt {
	$error = !$?
	Write-Host
	Write-Host -NoNewline -ForegroundColor Yellow                  ([Environment]::UserName)
	Write-Host -NoNewline                                          '@'
	Write-Host -NoNewline -ForegroundColor Cyan                    ([Environment]::MachineName)
	Write-Host -NoNewline                                          ':'
	Write-Host            -ForegroundColor Magenta                 $PWD.ProviderPath
	Write-Host -NoNewline -ForegroundColor ('Green','Red')[$error] $Script:prompt
	return [char]0x200B
}

#let the user know the OS being used
$Script:prompt = `
if ($IsLinux) {
	[char]0x25B6
}
elseif ($IsMacOS) {
	[char]0x2318
}
elseif ($env:WT_SESSION) {
	[char]0x2756
}
else {
	[char]0x2588
}

#make sure user knows if they're in an elevated session
if ($(if ($IsLinux) {
	#admin is not really a concept here because of sudoers file
	$False
}
elseif ($IsMacOS) {
	#TODO add full paths for commands so they *always* call the correct [default] binary
	groups [Environment]::UserName | grep -q -w admin | Out-Null
	!$?
}
else {
	#current role
	(New-Object Security.Principal.WindowsPrincipal(
		[Security.Principal.WindowsIdentity]::GetCurrent()
	#is admin?
	)).IsInRole(
		[Security.Principal.WindowsBuiltInRole]::Administrator
	)
})) {
	$Script:prompt = '!' + $Script:prompt
}

(Get-PSReadLineOption).HistorySavePath