fix(sudo): support pwsh (#32)

sudo.ps1

@@ -2,6 +2,12 @@ Set-StrictMode -Off;
 
 if(!$args) { "usage: sudo <cmd...>"; exit 1 }
 
+$powershellExe = Get-Process -Id $pid | Select-Object -ExpandProperty Path
+$commandPrefix = ''
+if ($host.Version.Major -gt 5) {
+    $commandPrefix = '-Command'
+}
+
 function is_admin {
 	return ([System.Security.Principal.WindowsIdentity]::GetCurrent().UserClaims | ? { $_.Value -eq 'S-1-5-32-544'})
 }
@@ -20,10 +26,10 @@ function sudo_do($parent_pid, $dir, $cmd) {
 
 	$kernel::freeconsole()
 	$kernel::attachconsole($parent_pid)
-		
+
 	$p = new-object diagnostics.process; $start = $p.startinfo
-	$start.filename = "powershell.exe"
-	$start.arguments = "-noprofile $cmd`nexit `$lastexitcode"
+	$start.filename = "$powershellExe"
+	$start.arguments = "-noprofile $commandPrefix $cmd`nexit `$lastexitcode"
 	$start.useshellexecute = $false
 	$start.workingdirectory = $dir
 	$p.start()
@@ -52,7 +58,7 @@ if(!(is_admin)) {
 }
 
 $a = if ($args[0] -eq '-please' -or $args[0] -eq '-plz') {
-	Get-History -Count 1 | select -ExpandProperty CommandLine
+	Get-History -Count 1 | Select-Object -ExpandProperty CommandLine
 } else {
 	serialize $args $true
 }
@@ -61,9 +67,10 @@ $wd = serialize (convert-path $pwd) # convert-path in case pwd is a PSDrive
 
 $savetitle = $host.ui.rawui.windowtitle
 $p = new-object diagnostics.process; $start = $p.startinfo
-$start.filename = "powershell.exe"
-$start.arguments = "-noprofile & '$pscommandpath' -do $wd $pid $a`nexit `$lastexitcode"
+$start.filename = "$powershellExe"
+$start.arguments = "-noprofile $commandPrefix & '$pscommandpath' -do $wd $pid $a`nexit `$lastexitcode"
 $start.verb = 'runas'
+$start.UseShellExecute = $true
 $start.windowstyle = 'hidden'
 try { $null = $p.start() }
 catch { exit 1 } # user didn't provide consent