Archive for March, 2009

emerge mono svn

March 31st, 2009

Yes, it's time for part two. If you're here it's probably because someone said "fixed in svn", and for most users of course that doesn't matter, but if you're a developer you might need to keep up with the latest.

Now, it's one thing to do a single install and it's another to do it repeatedly. So I decided to do something about it. Here is the script, just as quick and dirty and unapologetic as the language it's written in. To make up for that I've called it to give it a positive association.

What it does is basically encapsulate the findings from last time and just put it all into practice. Including setting up the parallel build environment for you. Just remember that once it's done building, source the file it spits out to run the installed binaries.

$ ./ merge world

$ .

$ monodevelop &

This is pretty simple stuff, though. Just run through all the steps, no logging. If it fails at some point during the process it stops so that you can see the error. Then if you hit Enter it continues.

# Copyright (c) 2009 Martin Matusiak <>
# Licensed under the GNU Public License, version 3.
# Build/update mono from svn

use warnings;

use Cwd;
use File::Path;
use Term::ReadKey;

my $SRCDIR = "/ex/mono-sources";
my $DESTDIR = "/ex/mono";

sub term_title {
	my ($s) = @_;
	system("echo", "-en", "\033]2;$s\007");

sub invoke {
	my (@args) = @_;

	print "> "; foreach my $a (@args) { print "$a "; }; print "\n";

	$exit = system(@args);
	return $exit;

sub dopause {
	ReadMode 'cbreak';
	ReadMode 'normal';

sub env_var {
	my ($var) = @_;
	my ($val) = $ENV{$var};
	return defined($val) ? $val : "";

sub env_get {
	my ($env) = {
		LD_LIBRARY_PATH => "$DESTDIR/lib:" . env_var("LD_LIBRARY_PATH"),
		C_INCLUDE_PATH => "$DESTDIR/include:" . env_var("C_INCLUDE_PATH"),
		ACLOCAL_PATH => "$DESTDIR/share/aclocal",
		PKG_CONFIG_PATH => "$DESTDIR/lib/pkgconfig",
		XDG_DATA_HOME => "$DESTDIR/share:" . env_var("XDG_DATA_HOME"),
		XDG_DATA_DIRS => "$DESTDIR/share:" . env_var("XDG_DATA_DIRS"),
		PATH => "$DESTDIR/bin:$DESTDIR:" . env_var("PATH"),
		PS1 => "[mono] \\w \\\$? @ ",
	return $env;

sub env_set {
	my ($env) = env_get();
	foreach my $key (keys %$env) {
		if ((!exists($ENV{$key})) || ($ENV{$key} ne $env->{$key})) {
			$ENV{$key} = $env->{$key};

sub env_write {
	my ($env) = env_get();
	open (WRITE, ">", "");
	foreach my $key (keys %$env) {
		my ($line) = sprintf("export %s=\"%s\"\n", $key, $env->{$key});
		print(WRITE $line);

sub pkg_get {
	my ($name, $svnurl) = @_;
	my $pkg = {
		name => $name,
		dir => $name, # fetch to
		workdir => $name, # build from
		svnurl => $svnurl,
		configurer => "",
		maker => "make",
		installer => "make install",
	return $pkg;

sub pkg_print {
	my ($pkg) = @_;
	foreach my $key (keys %$pkg) {
		printf("%14s : %s\n", $key, $pkg->{$key});		

sub pkg_action {
	my ($action, $dir, $pkg, $code) = @_;

	# Report on action that is to commence
	term_title(sprintf("Running %s %s", $action, $pkg->{name}));

	# Create destination path if it does not exist
	my ($path) = File::Spec->catdir($SRCDIR, $dir);
	unless (-d $dir) {

	# Chdir to source path
	my ($cwd) = getcwd();

	# Set environment

	# Perform action
	my ($exit) = &$code;

	# Chdir back to original path

	# Check exit code
	if ($exit == 0) {
		term_title(sprintf("Done %s %s", $action, $pkg->{name}));
	} else {
		term_title(sprintf("Failed %s %s", $action, $pkg->{name}));

sub pkg_fetch {
	my ($pkg, $rev) = @_;
	if (exists($pkg->{svnurl})) {
		my $code = sub {
			return invoke("svn", "checkout", "-r", $rev, $pkg->{svnurl}, ".");
		pkg_action("fetch", $pkg->{dir}, $pkg, $code);

sub pkg_configure {
	my ($pkg) = @_;

	if (exists($pkg->{configurer})) {
		my $code = sub {
			my ($configurer) = $pkg->{configurer};
			if (!-e $configurer) {
				if (-e "configure") {
					$configurer = "configure";
			return invoke("./$configurer --prefix=$DESTDIR");
		pkg_action("configure", $pkg->{workdir}, $pkg, $code);

sub pkg_premake {
	my ($pkg) = @_;

	if (exists($pkg->{premaker})) {
		my $code = sub {
			return invoke($pkg->{premaker});
		pkg_action("premake", $pkg->{workdir}, $pkg, $code);

sub pkg_make {
	my ($pkg) = @_;

	if (exists($pkg->{maker})) {
		my $code = sub {
			return invoke($pkg->{maker});
		pkg_action("make", $pkg->{workdir}, $pkg, $code);

sub pkg_install {
	my ($pkg) = @_;

	if (exists($pkg->{installer})) {
		my $code = sub {
			return invoke($pkg->{installer});
		pkg_action("install", $pkg->{workdir}, $pkg, $code);

sub pkglist_get {
	my $mono_svn = "svn://";
	my (@pkglist) = (
		{"libgdiplus" => "$mono_svn/libgdiplus"}, 
		{"mcs" => "$mono_svn/mcs"}, 
		{"olive" => "$mono_svn/olive"}, 
		{"mono" => "$mono_svn/mono"}, 
		{"debugger" => "$mono_svn/debugger"}, 
		{"mono-addins" => "$mono_svn/mono-addins"}, 
		{"mono-tools" => "$mono_svn/mono-tools"}, 
		{"gtk-sharp" => "$mono_svn/gtk-sharp"}, 
		{"gnome-sharp" => "$mono_svn/gnome-sharp"}, 
		{"monodoc-widgets" => "$mono_svn/monodoc-widgets"}, 
		{"monodevelop" => "$mono_svn/monodevelop"}, 
		{"paint-mono" => ""},

	my (@pkgs);
	foreach my $pkgh (@pkglist) {
		# prep
		my @ks = keys(%$pkgh); my $key = $ks[0];

		# init pkg
		my $pkg = pkg_get($key, $pkgh->{$key});

		# override defaults
		if ($pkg->{name} eq "mcs") {
		if ($pkg->{name} eq "olive") {
		if ($pkg->{name} eq "mono") {
			$pkg->{premaker} = "make get-monolite-latest";
		if ($pkg->{name} eq "gtk-sharp") {
			$pkg->{configurer} = "bootstrap-2.14";
		if ($pkg->{name} eq "gnome-sharp") {
			$pkg->{configurer} = "bootstrap-2.24";
		if ($pkg->{name} eq "paint-mono") {
			$pkg->{workdir} = File::Spec->catdir($pkg->{dir}, "src");

		push(@pkgs, $pkg);
	return @pkgs;

sub action_list {
	my (@pkgs) = pkglist_get();
	foreach my $pkg (@pkgs) {
		printf("%s\n", $pkg->{name});

my %actions = (
	list => -1,
	merge => 0,
	fetch => 1,
	configure => 2,
	make => 3,
	install => 4,

sub action_merge {
	my ($action, @worklist) = @_;

	# spit out to source when running

	# init source dir
	unless (-d $SRCDIR) {

	my (@pkgs) = pkglist_get();
	foreach my $pkg (@pkgs) {
		# filter on membership in worklist
		if (grep {$_ eq $pkg->{name}} @worklist) {

			# fetch
			if (($action == $actions{merge}) || ($action == $actions{fetch})) {
				my $revision = "HEAD";
				pkg_fetch($pkg, $revision);

			# configure
			if (($action == $actions{merge}) || ($action == $actions{configure})) {

			if (($action == $actions{merge}) || ($action == $actions{make})) {
				# premake, if any

				# make

			# install
			if (($action == $actions{merge}) || ($action == $actions{install})) {

sub parse_args {
	if (scalar(@ARGV) == 0) {
		printf("Usage:  %s <action> [<pkg1> <pkg2> | world]\n", $0);
		printf("Actions: %s\n", join(" ", keys(%actions)));

	my ($action) = $ARGV[0];
	if (!grep {$_ eq $action} keys(%actions)) {
		printf("Invalid action: %s\n", $action);

	my (@pkgnames) = splice(@ARGV, 1);
	if (grep {$_ eq "world"} @pkgnames) {
		@allpkgs = pkglist_get();
		@pkgnames = ();
		foreach my $pkg (@allpkgs) {
			push(@pkgnames, $pkg->{name});

	return (action => $action, pkgs => \@pkgnames);

sub main {
	my (%input) = parse_args();

	printf("Action selected: %s\n", $input{action});
	if (scalar(@{ $input{pkgs} }) > 0) {
		printf("Packages selected:\n");
		foreach my $pkgname (@{ $input{pkgs} }) {
			printf(" * %s\n", $pkgname);

	if ($actions{$input{action}} == $actions{list}) {

	action_merge($actions{$input{action}}, @{ $input{pkgs} })


Windows Forms: because you're worth it

March 23rd, 2009

Ah, Windows Forms. You've changed my life. I used to think Java was the lowest of low in gui programming, but I've had to reset my lowest common denominator in several areas already. Layout is horrendous, and the WinForms threading model is unfathomable. At least it's nothing important then.

But it also comes wrapped with easter eggs for your enjoyment. Try this on for size:

  1. Create a new thread, run splash screen.
  2. Initialize main gui in default thread.
  3. Signal splash thread to end.
  4. Splash screen calls Close().
  5. Call Join() on splash thread.
  6. Run main gui.
  7. Main gui appears behind all other open windows.

What do you mean that's not what you wanted? So you think to yourself "Aha! I'm cleverer than you are, stupid dot net. I'll make you wish you never gave me a BringToFront() method!" But that, despite the fantastically promising name, doesn't do anything. Neither does Activate().

No big deal. I'm sure noone is planning to use a splash screen in .NET anyway. So after aimlessly looking out the window for an hour and downing another three cups of awful coffee, you snap out of your prolonged daydream and start scrolling through the member list for the seventh time. Hm, a TopMost property. I wonder... Ah yes, that's the Stalin button. Makes your window always on top of all others. But what if..

// <stalin>
this.TopMost = true;
// </stalin>
this.Load += delegate (object o,EventArgs a) { this.TopMost = false; };

Yup, that actually works. When you're initializing the gui you fool the stack that hates you into thinking that you're going to be a dictator, but just when the window loads you turn off god mode. And that's enough to bring it to the front.

Windows Forms is truly fantastic for the kind of people who enjoy trivia. Just remembering hundreds of facts that have no real use just for the sake of knowing what few other people know. Take threading. Now, in most runtimes you would imagine that creating a new thread in your program has semantics such that whatever you've been doing until now in your single threaded application continues to work. The new bit you have to tackle is new threads you create in addition to the main one. Not so in .NET (I bet you saw that coming, you rascal!) For inexplicable reasons, your process has a way of hanging at the end just for the heck of it. I think I figured it out though. Are you ready for it?

splashthread = new Thread(RunSplash);
splashthread.IsBackground = true;
Thread.CurrentThread.IsBackground = true; // cure for cancer?

That's right, suddenly your main thread doesn't work the same anymore. You have to make it a background thread (which it clearly isn't), otherwise it just hangs there after Close().

EDIT: No, that didn't fix it either.

What a shame I didn't discover Windows Forms 7 years ago, I could have spent all that time learning all these exciting hacks instead of wasting my time on useless and unproductive things like Python.

data Binding made of fail?

March 9th, 2009

The following nabbed from

using System;
using System.Windows.Forms;

class Student {
	private string name;
	private double gpa;
	public string Name {
		get { return name; }
		set { name = value; }
	public double Gpa {
		get { return gpa; }
		set { gpa = value; }

class Widget : Form
	TextBox textBox1;
	TextBox textBox2;
	Button button;
	Student student;
	public static void Main(string[] args)
		Application.Run(new Widget());
	public Widget()
		student = new Student();
		student.Name = "Jeff";
		student.Gpa = 4.0;

		textBox1 = new TextBox();
		textBox2 = new TextBox();
		textBox1.DataBindings.Add(new Binding("Text", student, "Name"));
		textBox2.DataBindings.Add(new Binding("Text", student, "Gpa"));
		button = new Button();
		button.Click += new EventHandler(testButton_Click);
		TableLayoutPanel pan = new TableLayoutPanel();
		pan.ColumnCount = 3;
		pan.ColumnCount = 1;
		pan.Controls.Add(textBox1, 0, 0);
		pan.Controls.Add(textBox2, 1, 0);
		pan.Controls.Add(button, 2, 0);
	private void testButton_Click(object sender, EventArgs e) {
		MessageBox.Show("Name: " + student.Name 
				+ " GPA: " + student.Gpa);

Build with:

gmcs binding.cs -r:System.Windows.Forms

Looks tidy, except.. it doesn't do a damn thing. Values are extracted successfully from student, but setting them doesn't do anything. No matter how vigorously I edit the textboxes I always see the same values.

That's on Mono. On .NET I get this evilgram:

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.Reflection.TargetInvocationException: Property accessor 'Name' on object 'Student' threw the following exception:'Student.get_Name()' ---> System.MethodAccessException: Student.get_Name() ---> System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.ReflectionPermission, mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
   at System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Assembly asm, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle rmh, SecurityAction action, Object demand, IPermission permThatFailed)
   at System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Object assemblyOrString, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle rmh, SecurityAction action, Object demand, IPermission permThatFailed)
   at System.Security.CodeAccessSecurityEngine.CheckSetHelper(PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMethodHandle rmh, Object assemblyOrString, SecurityAction action, Boolean throwException)
   at System.Security.PermissionSetTriple.CheckSetDemand(PermissionSet demandSet, PermissionSet& alteredDemandset, RuntimeMethodHandle rmh)
   at System.Security.PermissionListSet.CheckSetDemand(PermissionSet pset, RuntimeMethodHandle rmh)
   at System.Security.PermissionListSet.DemandFlagsOrGrantSet(Int32 flags, PermissionSet grantSet)
   at System.Threading.CompressedStack.DemandFlagsOrGrantSet(Int32 flags, PermissionSet grantSet)
   at System.Security.CodeAccessSecurityEngine.ReflectionTargetDemandHelper(Int32 permission, PermissionSet targetGrant, CompressedStack securityContext)
   at System.Security.CodeAccessSecurityEngine.ReflectionTargetDemandHelper(Int32 permission, PermissionSet targetGrant)
The action that failed was:
The type of the first permission that failed was:
   --- End of inner exception stack trace ---
   at System.Reflection.MethodBase.PerformSecurityCheck(Object obj, RuntimeMethodHandle method, IntPtr parent, UInt32 invocationFlags)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.ComponentModel.ReflectPropertyDescriptor.GetValue(Object component)
   --- End of inner exception stack trace ---
   at System.ComponentModel.ReflectPropertyDescriptor.GetValue(Object component)
   at System.Windows.Forms.BindToObject.GetValue()
   at System.Windows.Forms.Binding.PushData(Boolean force)
   at System.Windows.Forms.Binding.UpdateIsBinding()
   at System.Windows.Forms.Binding.CheckBinding()
   at System.Windows.Forms.Binding.SetListManager(BindingManagerBase bindingManagerBase)
   at System.Windows.Forms.ListManagerBindingsCollection.AddCore(Binding dataBinding)
   at System.Windows.Forms.BindingsCollection.Add(Binding binding)
   at System.Windows.Forms.BindingContext.UpdateBinding(BindingContext newBindingContext, Binding binding)
   at System.Windows.Forms.Control.UpdateBindings()
   at System.Windows.Forms.Control.OnBindingContextChanged(EventArgs e)
   at System.Windows.Forms.Control.OnParentBindingContextChanged(EventArgs e)
   at System.Windows.Forms.Control.OnBindingContextChanged(EventArgs e)
   at System.Windows.Forms.Control.OnParentBindingContextChanged(EventArgs e)
   at System.Windows.Forms.Control.OnBindingContextChanged(EventArgs e)
   at System.Windows.Forms.Control.set_BindingContextInternal(BindingContext value)
   at System.Windows.Forms.ContainerControl.set_BindingContext(BindingContext value)
   at System.Windows.Forms.ContainerControl.get_BindingContext()
   at System.Windows.Forms.Control.get_BindingContextInternal()
   at System.Windows.Forms.Control.get_BindingContext()
   at System.Windows.Forms.Control.get_BindingContextInternal()
   at System.Windows.Forms.Control.get_BindingContext()
   at System.Windows.Forms.Control.UpdateBindings()
   at System.Windows.Forms.Control.OnBindingContextChanged(EventArgs e)
   at System.Windows.Forms.Control.OnParentBindingContextChanged(EventArgs e)
   at System.Windows.Forms.Control.OnBindingContextChanged(EventArgs e)
   at System.Windows.Forms.Control.OnParentBindingContextChanged(EventArgs e)
   at System.Windows.Forms.Control.OnBindingContextChanged(EventArgs e)
   at System.Windows.Forms.ContainerControl.OnCreateControl()
   at System.Windows.Forms.Form.OnCreateControl()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.WmShowWindow(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ContainerControl.WndProc(Message& m)
   at System.Windows.Forms.Form.WmShowWindow(Message& m)
   at System.Windows.Forms.Form.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
    Assembly Version:
    Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
    CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
    Assembly Version:
    Win32 Version:  
    CodeBase: file:///Z:/lumiere/Binding.exe
    Assembly Version:
    Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/
    Assembly Version:
    Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/
    Assembly Version:
    Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/
    Assembly Version:
    Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
    CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/Accessibility/

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the section.
The application must also be compiled with debugging

For example:


When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

worthless plurality

March 2nd, 2009

Behold, a valid sentence in Polish:

- Je.

In context:

- Co robi? (What's he doing?)
- Je. (He's eating.)*

In Polish verbs reflect the actor, so "je" is the singular, present form of eat. This makes saying "he's eating" (On je.) unnecessary because the he is already given in the form of the verb.

Behold, the same in French:

- Il mange. (He's eating.)
- Ils mangent. (They're eating.)

Same story? Not quite. You see, in Polish you pronounce every single letter. In French you don't. Il mange and Ils mangent sound exactly alike (singular and plural). Which means it's impossible to infer from that sentence alone what the hell is happening.

Let's step back and think about that for a while. Here you have all these verb forms that change depending on the pronoun. But they're pronounced the same anyway. So what the hell is the point? Ils mangent is no more insightful in speech than Ils mange would have been. It's only in writing that it makes a difference. And in writing there's obviously no need to have the special form because the pronoun is sitting right next to it!

Let's try the first sentence again:

- Mange. (Pronounced the same whether it's je, tu, il/elleils/elles.)

Now, despite the fact that you have all these different forms, the only thing you can rule out is that it isn't nous or vous. Very insightful, isn't it?


* Can also be "she" or "it".