c@50: <#
c@50: 
c@50: .SYNOPSIS
c@50: A simple manager for third-party source code dependencies.
c@50: Run "vext help" for more documentation.
c@50: 
c@50: #>
c@50: 
c@50: $sml = $env:VEXT_SML
c@50: 
c@50: $mydir = Split-Path $MyInvocation.MyCommand.Path -Parent
c@50: $program = "$mydir/vext.sml"
c@50: 
c@50: # We need either Poly/ML or SML/NJ. No great preference as to which.
c@50: 
c@50: if (!$sml) {
c@50:     if (Get-Command "polyml" -ErrorAction SilentlyContinue) {
c@50:        $sml = "poly"
c@50:     } elseif (Get-Command "sml" -ErrorAction SilentlyContinue) {
c@50:        $sml = "smlnj"
c@50:     } else {
c@50:        echo @"
c@50: 
c@50: ERROR: No supported SML compiler or interpreter found       
c@50: 
c@50:   The Vext external source code manager needs a Standard ML (SML)
c@50:   compiler or interpreter to run.
c@50: 
c@50:   Please ensure you have one of the following SML implementations
c@50:   installed and present in your PATH, and try again.
c@50: 
c@50:     1. Poly/ML
c@50:        - executable name: polyml
c@50: 
c@50:     2. Standard ML of New Jersey
c@50:        - executable name: sml
c@50: 
c@50: "@
c@50:        exit 1
c@50:     }
c@50: }
c@50: 
c@50: if ($args -match "[^a-z]") {
c@50:     $arglist = '["usage"]'
c@50: } else {
c@50:     $arglist = '["' + ($args -join '","') + '"]'
c@50: }
c@50: 
c@50: if ($sml -eq "poly") {
c@50: 
c@50:     $program = $program -replace "\\","\\\\"
c@50:     echo "use ""$program""; vext $arglist" | polyml -q --error-exit | Out-Host
c@50: 
c@50: } elseif ($sml -eq "smlnj") {
c@50: 
c@50:     $lines = @(Get-Content $program)
c@50:     $lines = $lines -notmatch "val _ = main ()"
c@50: 
c@50:     $intro = @"
c@50: val smlrun__cp = 
c@50:     let val x = !Control.Print.out in
c@50:         Control.Print.out := { say = fn _ => (), flush = fn () => () };
c@50:         x
c@50:     end;
c@50: val smlrun__prev = ref "";
c@50: Control.Print.out := { 
c@50:     say = fn s => 
c@50:         (if String.isSubstring "Error" s orelse String.isSubstring "Fail" s
c@50:          then (Control.Print.out := smlrun__cp;
c@50:                (#say smlrun__cp) (!smlrun__prev);
c@50:                (#say smlrun__cp) s)
c@50:          else (smlrun__prev := s; ())),
c@50:     flush = fn s => ()
c@50: };
c@50: "@ -split "[\r\n]+"
c@50: 
c@50:    $outro = @"
c@50: val _ = vext $arglist;
c@50: val _ = OS.Process.exit (OS.Process.success);
c@50: "@ -split "[\r\n]+"
c@50: 
c@50:    $script = @()
c@50:    $script += $intro
c@50:    $script += $lines
c@50:    $script += $outro
c@50: 
c@50:    $tmpfile = ([System.IO.Path]::GetTempFileName()) -replace "[.]tmp",".sml"
c@50: 
c@50:    $script | Out-File -Encoding "ASCII" $tmpfile
c@50: 
c@50:    $env:CM_VERBOSE="false"
c@50: 
c@50:    sml $tmpfile $args[1,$args.Length]
c@50: 
c@50:    del $tmpfile
c@50: 
c@50: } else {
c@50: 
c@50:    "Unknown SML implementation name: $sml"
c@50:    exit 2
c@50: }