Latest 10 wiki articles:

open console here

Posted on 8.2.2009 at 20hours 5 minutes with the tags : Windows7, Os,

As I'm working on Windows 7 untill 3 weeks now, I was tired of opening a powershell console and type cd ....

So here's a reg file for that:

Windows Registry Editor Version 5.00
@="PowerShell Here"
@="C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\powershell.exe -NoExit -Command Set-Location -LiteralPath '%L'"

Save it as ie open_powershell_here.reg, then just double-click on it and accept.

Now, you've got a "PowerShell Here" when you right-click on a directory.

Last time modified on 8.2.2009 at 20hours 5 minutes


Factor programming

Posted on 13.11.2008 at 11hours 58 minutes with the tags : Factor, Editor, Emacs,

I've just started studying Factor programming language, here are a few of my notes so far.

Table of contents:

  • Editing your Factor code

    Editing your Factor code

    Some notes on how to play with Factor with your favorite editor.

    Setting-up e texteditor

    I'll be using e-texteditor, because Factor comes with an included TextMate bundle. But be aware that there are unsupported actions under Windows inside the menu.

    I've made a special etexteditor.factor file for factor, you'll find it here.

    You'll have to create a file ~/.factor-rc. Windows explorer can't create a file that starts with a . , so this little python script will handle the task :

    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    conf = """USING: namespaces editors.etexteditor ;"""
    f = open('.factor-rc','w')

    Put this in your C:\Documents and Settings\user-name directory and run it once, it will then create a .factor-rc.

    Now, supposed you have a vocabulary inside work/palindrome and a word palindrome?, just type the following to edit your word definition:

    USE: palindrome
    \ palindrome? edit

    e-texteditor will then be called by Factor, you must see something like this :


    Note : I have a problem when editing a word, _e opens the file it is in but also another one called "-n9*" : I really don't know what's that.

    Using EMacs's FUEL mode

    Fuel in action

    A better alternative (for me) is to use the new EMacs's FUEL mode. It comes bundled with factor, inside the /misc directory.

    I've made a little cheatsheet for FUEL, you'll find it here : the FUEL cheatsheet

    Last time modified on 22.1.2009 at 19hours 44 minutes


    Be productive with PyQt4

    Posted on 25.9.2008 at 21hours 53 minutes with the tags : Python, Pyqt4,

    Some PyQt4 tips

    I enjoy working with PyQt. Here are several tips I use often to build applications.

    Some of them uses the excellent book from Mark Summerfield :

    Rapid GUI Programming with Python and Qt

    Transforming the ui file

    Suppose you've ui_myfile.ui. You want to build an Python executable with it. Open a command line and type in :

    pyuic4 -o -x ui_myfile.ui

    Ressource files

    As Mark Summerfield said

    Often your program assumes that the application directory is the directory where it is located. But if your program is executed from a different directory, it won't work as expected.

    So how to solve this problem ?

    • trying to solve it with Python's os.getcwd() won't work because this returns the directory where we invoked the application, wich as we have noted, may not be the directory where the application actually resides.
    • Nor does QApplication.applicationDirPath() method help, since this returns the path to the Python executable, not to our application itself.
    • Another solution is to put all our ressources (help files, images, etc.) into a single .py module and access them from here.
      This not only solve the path problem (because Python knows how to look for a module to be imported), but also means that instead of having dozens of icons, help files, and similar, some of wich could easily become lost, we have a single module containing them all.

    So, what's your choice here ? :)

    To produce a ressource module, we must do two things :

    1. create a .qrc file that contains the details of the ressources we want included. It's a simple XML file.
    2. run the pyrcc4 utility which reads a .qrc file and produces a ressource module.

    Suppose you have done a resources.qrc file, you generate a ressources module (here ) by :

    pyrcc4 -o resources.qrc

    Make a new custom class to use your generated file

    Suppose you've generated a file , create a file with the following contents :

    import sys
    from PyQt4 import QtGui, QtCore
    from ui_myfile import Ui_MainWindow
    class MyApp(QtGui.QMainWindow, Ui_MainWindow):
        def __init__(self):
    if __name__ == "__main__":
        app = QtGui.QApplication(sys.argv)
        window = MyApp()

    Changing the Look & Feel :

    Inside, and in the if \name\ == "\main\":, put the following lines to ie use the predefined Cleanlooks style.


    A little utility

    Doing all this is painfull. I've made a little script wich generates a .py file from a given .ui one, then it creates a '' file with all you need.

    Beware, I'm using Python 2.6 new feature (the with statement). Here it is : ''.

    Launch it with :

    python myfile.ui

    But be aware to launch this script only one time, otherwise the '' script will be overwritten and you'll lost all of your code !

    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    import sys
    import os
    template = """#!/usr/bin/env python
    # -*- coding: utf-8 -*-
    import sys
    from PyQt4 import QtGui, QtCore
    from %(name)s import Ui_MainWindow
    class MyApp(QtGui.QMainWindow, Ui_MainWindow):
        def __init__(self):
            # Setup the ui.
    if __name__ == "__main__":
        app = QtGui.QApplication(sys.argv)
        ## Look and feel changed to CleanLooks
        window = MyApp()
    def main(filename):
        os.system('pyuic4 -o %(name) -x %(name)s.ui'%{'name': filename})
        with open('', 'w') as f:
            f.write(template%{'name': filename})
    if __name__ == "__main__":
        filename = sys.argv[1]

    Translating signals/slot between C++ and Python

    If you read Qt4's doc, you may find some signals like this in C++:

    void itemDoubleClicked ( QTableWidgetItem * item )

    In PyQt4, you'll have to use the following signal (don't forget the star char !) :

    QtCore.SIGNAL("itemDoubleClicked (QTableWidgetItem*)")

    Another one, a QComboBox signal:

    void currentIndexChanged ( const QString & text )

    it has to be translated like this (the string is a constant here, so you'll have to tell it to PyQt):

    QtCore.SIGNAL("currentIndexChanged(const QString)")

    Mouse handling

    Wheel events

    You can catch any wheel event by defining a wheelEvent method on your widget, ie :

    def wheelEvent(self, event):
        if > 0 :
            print "delta positive"
            print "delta negative"

    Fullscreen apps

    You can show a widget in fullscreen mode by using the showFullScreen () method of the widget. Note that this apply only to windows. If you have a toolbar, it will be invisible in fullscreen mode.

    Here's a sample of a method I've used inside a MainWindow (in wich self.fullScreen = False by default):

    class MonAppli(QtGui.QMainWindow, Ui_MainWindow):
        def __init__(self):
            self.fullScreen = False
            QtGui.QShortcut(QtGui.QKeySequence("Ctrl+Shift+W"), self, self.toogleFullScreen )
        def toogleFullScreen(self):
            if not self.fullScreen :
            self.fullScreen = not (self.fullScreen)


    This snippet will show you how to handle QScintilla basically (it prints out all the lexers and the editor methods):

    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    Basic use of the QScintilla2 widget
    Note : name this file ""
    import PyQt4.Qsci
    langs = [i for i in dir(PyQt4.Qsci) if i.startswith('QsciLexer')]
    for i,l in enumerate(langs):
        print i,l[9:] # we don't need to print "QsciLexer" before each name
    import sys
    from PyQt4.QtGui import QApplication
    from PyQt4 import QtCore, QtGui
    from PyQt4.Qsci import QsciScintilla, QsciScintillaBase, QsciLexerPython
    if __name__ == "__main__":
        app = QApplication(sys.argv)
        editor = QsciScintilla()
        ## define the font to use
        font = QtGui.QFont()
        # the font metrics here will help
        # building the margin width later
        fm = QtGui.QFontMetrics(font)
        ## set the default font of the editor
        ## and take the same font for line numbers
        ## Line numbers
        # conventionnaly, margin 0 is for line numbers
        editor.setMarginWidth(0, fm.width( "00000" ) + 5)
        editor.setMarginLineNumbers(0, True)
        ## Edge Mode shows a red vetical bar at 80 chars
        ## Folding visual : we will use boxes
        ## Braces matching
        ## Editing line color
        ## Margins colors
        # line numbers margin
        # folding margin colors (foreground,background)
        ## Choose a lexer
        lexer = QsciLexerPython()
        ## Render on screen
        ## Show this file in the editor
        # Show all the methods of the editor
        methods = sorted(QsciScintilla.__dict__.keys())
        for m in methods :
            print m

    ... to be continued

    Last time modified on 3.11.2008 at 21hours 53 minutes


    windows tips

    Posted on 2.7.2008 at 12hours 11 minutes with the tags : Windows,

    Add a create new filetype on right-click menu

    I needed something today : add a shortcut to my right-clic menu for creating a new Python (or whatever) file.

    Inside regedit, find the entry HKEY_CLASSES_ROOT/.py .

    • Right-click on it then add a new key and give it the name ShellNew .
    • Now, inside HKEY_CLASSES_ROOT/.py/ShellNew create a new 'chain' variable, name it NullFile and give it the value Python.

    Quit regedit, now you've got your new entry inside the right-click menu.

    Another solution maybe to use this Python Cookbook recipe to manipulate the registry contents.

    The problem is that your new document will be empty. Using the PowerToys Tweak UI is even easier and you can have your own template : see this page for details.

    Last time modified on 2.7.2008 at 12hours 37 minutes



    Posted on 1.7.2008 at 9hours 34 minutes with the tags : Python, Projects,



    • GeoPyX : a personnal tool for visualising 2d geometry figures using the PyX package.
    • PyK! was my attempt to setup a text editor using the PyQt4 toolkit; it has some great features like snippets, plugins and so on.
    • TeXBases is a tool to manage and view all the exercises in TeX format I give for my students. Only works on Linux because it uses the GTK bindings to the Poppler libs.
    • Written the TextMate-like snippets features in the UliPad editor.


    Last time modified on 19.7.2008 at 22hours 22 minutes


    Lisp page

    Posted on 24.6.2008 at 11hours 13 minutes with the tags : Lisp, Scheme,

    My Lisp page

    Lisp book

    There are tons of programming languages, and even if I've choosen Python for my everyday work, I hope to switch one day to Common Lisp.

    Common Lisp you can choose your programmming style :

    1. functionnal;
    2. imperative;
    3. object-oriented (one of the most elaborated);

    I'll try to add here some of my experiments with it on this page.

    The only book I have is Peter Seibel's Practical Common Lisp. It's avaible online, but I really suggest you to buy the original from APress, because they've done a beautiful work.


    "Parentheses? What parentheses? I haven't noticed any parentheses since my first month of Lisp programming. I like to ask people who complain about parentheses in Lisp if they are bothered by all the spaces between words in a newspaper" - Ken Tilton


    Clojure maybe the Lisp future.

    NewLisp is very interesting : a Lisp-like scripting langage like Python, Ruby and Perl but with macros, and nice features. It's well documented (using the excellent ConTeXt) and very fun to play with.

    Last time modified on 13.11.2008 at 13hours 0 minutes


    Python links

    Posted on 23.6.2008 at 15hours 43 minutes with the tags : Python,


    The new Python docs are here: Python 2.6 docs


    There's only one for the moment : Python Magazine




    • The very good page of a French professor in Computer Science : Karczma .
    • My little ShadesOfPy .






    Some tools may help you in writting GTK2 apps :




    • Albow is a GUI lib based on PyGame.

    Text manipulation

    DSL (Domain Specific Langage)

    Parsing techniques

    Best practices

    Usefull libs

    • PLib : A namespace package for a number of useful sub-packages and modules.

    Last time modified on 3.11.2008 at 22hours 54 minutes


    Haskell page

    Posted on 23.6.2008 at 12hours 2 minutes with the tags : Haskell,

    Haskell Links




    • An EMacs clone in Haskell : Yi

    Last time modified on 23.6.2008 at 18hours 31 minutes


    Compiling Vim with python support on Windows

    Posted on 20.6.2008 at 15hours 11 minutes with the tags : Vim, Python, Editor,

    Building Vim with Python support on Windows

    Vim does not have a native Python 2.6 support on Windows, so you'll have to build it yourself.

    The site ShowMeDo gives a nice turorial on the subject.

    I'm listing here the important steps :

    1. Install MingW, directly or by another programm (I personnaly installed Qt4.4 on Windows with MingW inside it) ;
    2. Download and Install binaries of GVim on the official Vim site;
    3. Download on the Vim site;
    4. Unzip it and go to the src dir;
    5. Edit the file Make_ming.mak

    The Python section starts at line 130, modify it as follows :

    # Python support -- works with the ActiveState python 2.0 release (and others
    # too, probably)
    # uncomment 'PYTHON' to make python-enabled version
    # Put the path to the python distro here.  If cross compiling from Linux, you
    # will also need to convert the header files to unix instead of dos format:
    #   for fil in *.h ; do vim -e -c 'set ff=unix|w|q' $fil
    # and also, you will need to make a mingw32 'libpython20.a' to link with:
    #   cd $PYTHON/libs
    #   pexports python20.dll > python20.def
    #   dlltool -d python20.def -l libpython20.a
    # on my Linux box, I put the Python stuff here:
    # on my NT box, it's here:
    ifdef PYTHON
    ifndef PYTHON_VER

    Then, compile with :

    mingw32-make -f Make_ming.mak gvim.exe

    You just have to replace the old gvim.exe by the new one you've just compiled.

    Note: Since this article, Vim 7.2 appeared and the given source file does not work as expected. I had to use the source file from SVN directory to get it work correctly.

    Note 2: Compiling with Ruby support gave me a lot of errors, I have to find why.

    To test if Python is installed, type the following :

    :echo has("python")

    This should return 1 (for True).

    Setting the fonts

    To set the default fonts, you have to modify you vim.rc :

    Under Linux, you'll have to write this : set guifont=Consolas\ 12 Under a Windows machine, this is done like this : set guifont=consolas:h12

    Last time modified on 13.11.2008 at 12hours 23 minutes


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