pbot/applets/compiler_vm/host/bin/vm-exec

#!/usr/bin/env perl

# File: vm-exec
#
# Purpose: Process and send commands to the PBot virtual machine on the
# default TCP port (5555). Use the PBOTVM_SERIAL environment variable to
# override the port. E.g., to use port 7777 instead:
#
# $ PBOTVM_SERIAL=7777 vm-exec -lang=sh echo test

# SPDX-FileCopyrightText: 2021 Pragmatic Software <pragma78@gmail.com>
# SPDX-License-Identifier: MIT

use warnings;
use strict;

use File::Basename;
use JSON::XS;

use FindBin qw($RealBin);
use lib "$RealBin/../lib";

use constant {
    SERIAL_PORT => $ENV{PBOTVM_SERIAL} // 5555,
};

my $json = join ' ', @ARGV;
my $data = eval { decode_json $json };

if ($@) {
    # wasn't JSON; make structure manually
    if ($json =~ s/^-lang=([^ ]+)\s+//) {
      $data = { lang => $1, code => $json };
    } else {
      $data = { code => $json };
    }
}

if (not exists $data->{code}) {
    die "Usage: $0 <code>\n";
}

# set any missing fields to default values
$data->{nick}      //= 'vm';
$data->{channel}   //= 'vm';
$data->{lang}      //= 'c11';
$data->{'vm-port'} //= SERIAL_PORT;

# parse -lang option
if ($data->{code} =~ s/^-lang=([^ ]+)\s+//) {
    $data->{lang} = $1;
}

my $language = lc $data->{lang};

eval {
    require "Languages/$language.pm";
} or do {
    my $found = 0;
    my ($languages, $comma) = ('', '');

    foreach my $module (sort glob "$RealBin/../lib/Languages/*.pm") {
        $module = basename $module;
        $module =~ s/.pm$//;
        next if $module =~ m/^_/;

        require "Languages/$module.pm" or die $!;
        my $mod = "Languages::$module"->new;

        if (exists $mod->{name} and $mod->{name} eq $language) {
            $language = $module;
            $found = 1;
            last;
        }

        $module = $mod->{name} if exists $mod->{name};
        $languages .= "$comma$module";
        $comma = ', ';
    }

    if (not $found) {
        print "Language '$language' is not supported.\nSupported languages are: $languages\n";
        exit;
    }
};

if (not length $data->{code}) {
    if (exists $data->{usage}) {
        print "$data->{usage}\n";
    } else {
        print "Usage: cc [-lang=<language>] [-info] [-paste] [-args \"command-line arguments\"] [compiler/language options] <code> [-stdin <stdin input>]\n";
    }
    exit;
}

my $lang = "Languages::$language"->new(%$data);

$lang->{local} = $ENV{CC_LOCAL};

$lang->process_interactive_edit;
$lang->process_standard_options;
$lang->process_custom_options;
$lang->process_cmdline_options;
$lang->preprocess_code;
$lang->execute;
$lang->postprocess_output;
$lang->show_output;