Start working on a better shell mechanism for Windows

It uses a Perl script to keep a bash session open, which attaches to a
port the game keeps open. This avoids having to start a new Git bash for
each command, improving the execution speed by a factor of 3-4.

scenes/game.gd

@@ -21,6 +21,8 @@ func _ready():
 	else:
 		game.toggle_music()
 		
+	start_remote_shell()
+	
 	global_shell = Shell.new()
 
 	if global_shell.run("command -v git &>/dev/null && echo yes || echo no") == "no\n":
@@ -34,6 +36,25 @@ func _ready():
 	
 	load_state()
 
+func start_remote_shell():
+	var user_dir = ProjectSettings.globalize_path("user://")
+	var script_content = helpers.read_file("res://scripts/net-test")
+	var target_filename = user_dir + "net-test"
+	var target_file = File.new()
+	target_file.open(target_filename, File.WRITE)
+	target_file.store_string(script_content)
+	target_file.close()
+	helpers.exec_async(_perl_executable(), [target_filename])
+
+func _perl_executable():
+	if OS.get_name() == "Windows":
+		return "dependencies/windows/git/usr/bin/perl.exe"
+	else:
+		return "perl"
+
+func shell_received(text):
+	print(text)
+
 func _notification(what):
 	if what == MainLoop.NOTIFICATION_WM_QUIT_REQUEST:
 		#get_tree().quit() # default behavio
@@ -99,3 +120,7 @@ func toggle_music():
 		music.volume_db -= 100
 	else:
 		music.volume_db += 100
+
+
+func shell_test(command):
+	return $ShellServer.send(command)

scenes/game.tscn

@@ -1,7 +1,8 @@
-[gd_scene load_steps=3 format=2]
+[gd_scene load_steps=4 format=2]
 
 [ext_resource path="res://scenes/game.gd" type="Script" id=1]
 [ext_resource path="res://music/gigantic-greasy-giraffe.ogg" type="AudioStream" id=2]
+[ext_resource path="res://scenes/tcp_server_shell.tscn" type="PackedScene" id=3]
 
 [node name="Node" type="Node"]
 script = ExtResource( 1 )
@@ -10,3 +11,6 @@ script = ExtResource( 1 )
 stream = ExtResource( 2 )
 volume_db = -15.0
 autoplay = true
+
+[node name="ShellServer" parent="." instance=ExtResource( 3 )]
+port = 6666

scenes/helpers.gd

@@ -35,6 +35,9 @@ func exec(command, args=[], crash_on_fail=true):
 
 	return {"output": output, "exit_code": exit_code}
 
+func exec_async(command, args=[]):
+	OS.execute(command, args, false)
+
 # Return the contents of a file. If no fallback_string is provided, crash when
 # the file doesn't exist.
 func read_file(path, fallback_string=null):

scenes/tcp_server.gd

@@ -1,6 +1,7 @@
 extends Node
 
 signal data_received(string)
+signal new_connection
 
 export var port: int
 
@@ -21,21 +22,24 @@ func _process(_delta):
 			helpers.crash("Dropping active connection")
 		_c = _s.take_connection()
 		_connected = true
+		emit_signal("new_connection")
 		print("connected!")
 	
 	if _connected:
 		if _c.get_status() != StreamPeerTCP.STATUS_CONNECTED:
 			_connected = false
 			print("disconnected")
-		var available = _c.get_available_bytes()
+#		var available = _c.get_available_bytes()
-		while available > 0:
+#		while available > 0:
-			var data = _c.get_utf8_string(available)
+#			var data = _c.get_utf8_string(available)
-			emit_signal("data_received", data)
+#			emit_signal("data_received", data)
-			available = _c.get_available_bytes()
+#			available = _c.get_available_bytes()
 
 func send(text):
 	if _connected:
 		text += "\n"
-		_c.put_data(text.to_utf8())
+		_c.put_utf8_string(text)
+		var response = _c.get_utf8_string()
+		emit_signal("data_received", response)
 	else:
 		helpers.crash("Trying to send data on closed connection")

scenes/tcp_server_shell.gd

@@ -0,0 +1,50 @@
+extends Node
+
+signal data_received(string)
+signal new_connection
+
+export var port: int
+
+var _s = TCP_Server.new()
+var _c
+var _connected = false
+
+func _ready():
+	start()
+
+func start():
+	_s.listen(port)
+		
+func _process(_delta):
+	if _s.is_connection_available():
+		if _connected:
+			_c.disconnect_from_host()
+			helpers.crash("Dropping active connection")
+		_c = _s.take_connection()
+		_connected = true
+		emit_signal("new_connection")
+		print("connected!")
+	
+	if _connected:
+		if _c.get_status() != StreamPeerTCP.STATUS_CONNECTED:
+			_connected = false
+			print("disconnected")
+#		var available = _c.get_available_bytes()
+#		while available > 0:
+#			var data = _c.get_utf8_string(available)
+#			emit_signal("data_received", data)
+#			available = _c.get_available_bytes()
+
+func send(text):
+	if _connected:
+		_c.put_utf8_string(text)
+		var response = _c.get_utf8_string()
+		var exit_code = _c.get_u32()
+		
+		var shell_command = ShellCommand.new()
+		shell_command.command = text
+		shell_command.output = response
+		shell_command.exit_code = exit_code
+		return shell_command
+	else:
+		helpers.crash("Trying to send data on closed connection")

scenes/tcp_server_shell.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://scenes/tcp_server_shell.gd" type="Script" id=1]
+
+[node name="TCPServerShell" type="Node"]
+script = ExtResource( 1 )

scenes/terminal.gd

@@ -85,8 +85,9 @@ func send_command(command):
 	editor_regex.compile("^(vim?|gedit|emacs|kate|nano|code) ")
 	command = editor_regex.sub(command, "fake-editor ")
 
-	var cmd = repository.shell.run_async(command, false)
+#	var cmd = repository.shell.run_async(command, false)
-	yield(cmd, "done")
+#	yield(cmd, "done")
+	var cmd = game.shell_test(command)
 	call_deferred("command_done", cmd)
 
 func command_done(cmd):

scripts/net-test

@@ -1,24 +1,61 @@
 #!/usr/bin/env perl
 
+use IPC::Open2;
 use IO::Socket;
 
+my $pid = open2(my $out, my $in, 'bash');
+
 $socket = IO::Socket::INET->new(PeerAddr => "127.0.0.1",
                                 PeerPort => 6666,
                                 Proto    => "tcp",
                                 Type     => SOCK_STREAM);
 
-$s = "Hey äöü!";
+#$s = "Hey äöü!";
+#
+#my $send_length = pack("L", length($s));
+#$socket->send($send_length);
+#$socket->send($s);
 
+while(true) {
+    #STDOUT->flush();
+    my $len;
+    $socket->recv($len, 4);
+    my $actual_len = unpack("L", $len);
+    if ($actual_len == 0) {
+        print("not connected");
+        exit;
+    }
+    print("still connected");
+    my $s2;
+    $socket->recv($s2, ord($len));
+
+    print($s2);
+    STDOUT->flush();
+
+    #$s = `bash -c '$s2' 2>&1`;
+
+    $s = "";
+    $command = $s2 . "\necho MAGIC\n";
+    print $in $command;
+
+    inner_while: while (true) {
+        $line = <$out>;
+        if ($line eq "MAGIC\n") {
+            STDOUT->flush();
+            last inner_while;
+        }
+        $s = $s . $line;
+    }
+    print "got complete output";
+    print $s;
+
+    print length($s);
+    STDOUT->flush();
     my $send_length = pack("L", length($s));
     $socket->send($send_length);
     $socket->send($s);
 
-while(true) {
+    my $exit_code = pack("L", 0);
-    my $len;
+    $socket->send($exit_code);
-    $socket->recv($len, 4);
+
-    my $actual_len = unpack("L", $len);
-    my $s2;
-    $socket->recv($s2, ord($len));
-    print($s2);
-    STDOUT->flush();
 }