Artikel getaggt mit gobject-introspection

PyGObject 3.7.92 released

I just released a new PyGObject for GNOME 3.7.92. This fixes a couple of crashes and marshalling errors again, but most importantly got a change to automatically mute the PyGIDeprecationWarnings for stable versions. Please run pythonX.X with the -Wd option to still be able to see them.

We got through all our bugs that were milestoned for GNOME 3.8 and don’t want to or plan to introduce any major behavioural change at this point, so barring catastrophes this is what will be in GNOME 3.8.0.

Thanks to all contributors!

  • Fix stack smasher when marshaling enums as a vfunc return value (Simon Feltman) (#637832)
  • Change base class of PyGIDeprecationWarning based on minor version (Simon Feltman) (#696011)
  • autogen.sh: Source gnome-autogen to fix out of source builddir (Alban Browaeys) (#694889)
  • pygtkcompat: Make gdk.Window.get_geometry return tuple of 5 (Simon Feltman)
  • pygtkcompat: Initialize hint to zero in set_geometry_hints (Simon Feltman)
  • Remove incorrect bounds check with property helper flags (Simon Feltman)
  • Fix crash when setting property of type object to an incorrect type (Simon Feltman) (#695420)
  • Remove skipping of object property tests (Simon Feltman) (#695420)
  • Give more informative error when setting property to incorrect type (Simon Feltman) (#695420)

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Automatically generating documentation from GIR files

Many libraries build a GObject introspection repository (*.gir) these days which allows the library to be used from many scripting (Python, JavaScript, Perl, etc.) and other (e. g. Vala) languages without the need for manually writing bindings for each of those.

One issue that I hear surprisingly often is “there is zero documentation for those bindings”. Tools for building documentation out of a .gir have existed for a long time already, just far too many people seem to not know about them.

For example, to build Yelp XML documentation out of the libnotify bindings for Python:

  $ g-ir-doc-tool --language=Python -o /tmp/notify-doc /usr/share/gir-1.0/Notify-0.7.gir

Then you can call yelp /tmp/notify-doc to browse the documentation. You can of course also use the standard Mallard tools to convert them to HTML for sticking them on a website:

  $ cd /tmp/notify-doc
  $ yelp-build html .

Admittedly they are far from pretty, and there are still lots of refinements that should be done for the documentation itself (like adding language specific examples) and also for the generated result (prettification, dynamic search, and what not), but it’s certainly far from “nothign”, and a good start.

If you are interested in working on this, please show up in #introspection or discuss it on bugzilla, desktop-devel-list@, or the library specific lists/bug trackers.

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PyGObject 3.7.91 released.

I just released a new PyGObject for GNOME 3.7.91. This brings some marshalling fixes, plugs tons of memory leaks, and now raises a Python DeprecationWarning when your code calls a method which is marked as deprecated in the typelib. Please note that Python hides them by default, so if you are interested in those you need to run python with the -Wd option.

Thanks to all contributors!

  • Fix many memory leaks (#675726, #693402, #691501, #510511, #672224, and several more which are detected by our test suite) (Martin Pitt)
  • Dot not clobber original Gdk/Gtk functions with overrides (Martin Pitt) (#686835)
  • Optimize GValue.get/set_value by setting GValue.g_type to a local (Simon Feltman) (#694857)
  • Run tests with G_SLICE=debug_blocks (Martin Pitt) (#691501)
  • Add override helper for stripping boolean returns (Martin Pitt) (#694431)
  • Drop obsolete pygobject_register_sinkfunc() declaration (Martin Pitt) (#639849)
  • Fix marshalling of C arrays with explicit length in signal arguments (Martin Pitt) (#662241)
  • Fix signedness, overflow checking, and 32 bit overflow of GFlags (Martin Pitt) (#693121)
  • gi/pygi-marshal-from-py.c: Fix build on Visual C++ (Chun-wei Fan) (#692856)
  • Raise DeprecationWarning on deprecated callables (Martin Pitt) (#665084)
  • pygtkcompat: Add Widget.window, scroll_to_mark, and window methods (Simon Feltman) (#694067)
  • pygtkcompat: Add Gtk.Window.set_geometry_hints which accepts keyword arguments (Simon Feltman) (#694067)
  • Ship pygobject.doap for autogen.sh (Martin Pitt) (#694591)
  • Fix crashes in various GObject signal handler functions (Simon Feltman) (#633927)
  • pygi-closure: Protect the GSList prepend with the GIL (Olivier Crête) (#684060)
  • generictreemodel: Fix bad default return type for get_column_type (Simon Feltman)

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PyGObject 3.7.4 released

I just released a new PyGObject, for GNOME 3.7.4 which is due on Wednesday.

This release saw a lot of bug and memory leak fixes again, as well as enabling some more data types such as GParamSpec, boxed list properties, or directly setting string members in structs.

Thanks to all contributors!

Summary of changes (see change log for complete details):

  • Allow setting values through GtkTreeModelFilter (Simonas Kazlauskas) (#689624)
  • Support GParamSpec signal arguments from Python (Martin Pitt) (#683099)
  • pygobject_emit(): Fix cleanup on error (Martin Pitt)
  • Add signal emission methods to TreeModel which coerce the path argument (Simon Feltman) (#682933)
  • Add override for GValue (Bastian Winkler) (#677473)
  • Mark caller-allocated boxed structures as having a slice allocated (Mike Gorse) (#699501)
  • pygi-property: Support boxed GSList/GList types (Olivier Crête) (#684059)
  • tests: Add missing backwards compat methods for Python 2.6 (Martin Pitt) (#691646)
  • Allow setting TreeModel values to None (Simon Feltman) (#684094)
  • Set clean-up handler for marshalled arrays (Mike Gorse) (#691509)
  • Support setting string fields in structs (Vadim Rutkovsky) (#678401)
  • Permit plain integers for “gchar” values (Martin Pitt)
  • Allow single byte values for int8 types (Martin Pitt) (#691524)
  • Fix invalid memory access handling errors when registering an enum type (Mike Gorse)
  • Fix (out) arguments in callbacks (Martin Pitt)
  • Fix C to Python marshalling of struct pointer arrays (Martin Pitt)
  • Don’t let Property.setter() method names define property names (Martin Pitt) (#688971)
  • Use g-i stack allocation API (Martin Pitt) (#615982)
  • pyg_value_from_pyobject: support GArray (Ray Strode) (#690514)
  • Fix obsolete automake macros (Marko Lindqvist) (#691101)
  • Change dynamic enum and flag gtype creation to use namespaced naming (Simon Feltman) (#690455)
  • Fix Gtk.UIManager.add_ui_from_string() override for non-ASCII chars (Jonathan Ballet) (#690329)
  • Don’t dup strings before passing them to type registration functions (Mike Gorse) (#690532)
  • Fix marshalling of arrays of boxed struct values (Carlos Garnacho) (#656312)
  • testhelpermodule.c: Do not unref called method (Martin Pitt)

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PyGObject 3.7.3 released

I just released a new PyGObject, for GNOME 3.7.3 which is due on Wednesday.

This is mostly a bug fix release. There is one API addition, it brings back official support for calling GLib.io_add_watch() with a Python file object or fd as first argument, in addition to the official API which expects a GLib.IOChannel object. These modes were marked as deprecated in 3.7.2 (only).

Thanks to all contributors!

Summary of changes (see change log for complete details):

  • Add support for caller-allocated GArray out arguments (Martin Pitt) (#690041)
  • Re-support calling GLib.io_add_watch with an fd or Python file (Martin Pitt)
  • pygtkcompat: Work around IndexError on large flags (Martin Pitt)
  • Fix pyg_value_from_pyobject() range check for uint (Martin Pitt)
  • Fix tests to work with g-i 1.34.2 (Martin Pitt)
  • Fix wrong refcount for GVariant property defaults (Martin Pitt) (#689267)
  • Fix array arguments on 32 bit (Martin Pitt)
  • Add backwards compatible API for GLib.unix_signal_add_full() (Martin Pitt)
  • Drop MININT64/MAXUINT64 workaround, current g-i gets this right now (Martin Pitt)
  • Fix maximum and minimum ranges of TYPE_(U)INT64 properties (Simonas Kazlauskas) (#688949)
  • Ship pygi-convert.sh in tarballs (Martin Pitt) (#688697)
  • Various added and improved tests (Martin Pitt)

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PyGObject 3.7.2 released

just released a new PyGObject, for GNOME 3.7.2 which is due on Wednesday.

In this version PyGObject went through some major refactoring: Some 5.000 lines of static bindings were removed and replaced with proper introspection and some overrides for backwards compatibility, and the static/GI/overrides code structure was simplified. For the developer this means that you can now use the full GLib API, a lot of which was previously hidden by old and incomplete static bindings; also you can and should now use the officially documented GLib API instead of PyGObject’s static one, which has been marked as deprecated. For PyGObject itself this change means that the code structure is now a lot simpler to understand, all the bugs in the static GLib bindings are gone, and the GLib bindings will not go out of sync any more.

Lots of new tests were written to ensure that the API is backwards compatible, but experience teaches that ther is always the odd corner case which we did not cover. So if your code does not work any more with 3.7.2, please do report bugs.

Another important change is that if you build pygobject from source, it now defaults to using Python 3 if installed. As before, you can build for Python 2 with PYTHON=python2.7 or the new --with-python=python2.7 configure option.

This release also brings several marshalling fixes, docstring improvements, support for code coverage, and other bug fixes.

Thanks to all contributors!

Summary of changes (see changelog for complete details):

  • [API change] Drop almost all static GLib bindings and replace them with proper introspection. This gets rid of several cases where the PyGObject API was not matching the real GLib API, makes the full GLib API available through introspection, and makes the code smaller, easier to maintain. For backwards compatibility, overrides are provided to emulate the old static binding API, but this will throw a PyGIDeprecationWarning for the cases that diverge from the official API (in particular, GLib.io_add_watch() and GLib.child_watch_add() being called without a priority argument). (Martin Pitt, Simon Feltman)
  • [API change] Deprecate calling GLib API through the GObject namespace. This has always been a misnomer with introspection, and will be removed in a later version; for now this throws a PyGIDeprecationWarning.
  • [API change] Do not bind gobject_get_data() and gobject_set_data(). These have been deprecated for a cycle, now dropped entirely. (Steve Frécinaux) (#641944)
  • [API change] Deprecate void pointer fields as general PyObject storage. (Simon Feltman) (#683599)
  • Add support for GVariant properties (Martin Pitt)
  • Add type checking to GVariant argument assignment (Martin Pitt)
  • Fix marshalling of arrays of struct pointers to Python (Carlos Garnacho) (#678620)
  • Fix Gdk.Atom to have a proper str() and repr() (Martin Pitt) (#678620)
  • Make sure g_value_set_boxed does not cause a buffer overrun with GStrvs (Simon Feltman) (#688232)
  • Fix leaks with GValues holding boxed and object types (Simon Feltman) (#688137)
  • Add doc strings showing method signatures for gi methods (Simon Feltman) (#681967)
  • Set Property instance doc string and blurb to getter doc string (Simon Feltman) (#688025)
  • Add GObject.G_MINSSIZE (Martin Pitt)
  • Fix marshalling of GByteArrays (Martin Pitt)
  • Fix marshalling of ssize_t to smaller ints (Martin Pitt)
  • Add support for lcov code coverage, and add a lot of missing GIMarshallingTests and g-i Regress tests. (Martin Pitt)
  • pygi-convert: remove deprecated GLib → GObject conversions (Jose Rostagno)
  • Add support for overriding GObject.Object (Simon Feltman) (#672727)
  • Add –with-python configure option (Martin Pitt)
  • Do not prefer unversioned “python” when configuring, as some distros have “python” as Python 3. Use Python 3 by default if available. Add –with-python configure option as an alternative to setting $PYTHON, whic is more discoverable. (Martin Pitt)
  • Fix property lookup in class hierarchy (Daniel Drake) (#686942)
  • Move property and signal creation into _class_init() (Martin Pitt) (#686149)
  • Fix duplicate symbols error on OSX (John Ralls)
  • [API add] Add get_introspection_module for getting un-overridden modules (Simon Feltman) (#686828)
  • Work around wrong 64 bit constants in GLib Gir (Martin Pitt) (#685022)
  • Mark GLib.Source.get_current_time() as deprecated (Martin Pitt)
  • Fix OverflowError in source_remove() (Martin Pitt) (#684526)

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PyGObject hackfest at GUADEC

I just received confirmation that my request for a PyGObject hackfest has been approved by the GUADEC organizers.

If you are developing GObject-introspection based Python applications and have some problems with PyGObject, this is the time and place to get to know each other, getting bugs fixed, learn about pygobject’s innards, or update libraries to become introspectable. I will prepare a list of easy things to look into if you are interested in learning about and getting involved in PyGObject’s development.

See you on July 30th in A Coruña!

GUADEC Badge

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libxklavier is now introspectable

On my 8 hour train ride to Budapest last Sunday I finally worked on making libxklavier introspectable. Thanks to Sergey’s fast review the code now landed in trunk. I sent a couple of refinements to the bug report still, but those are mostly just icing on the cake, the main functionality of getting and setting keyboard layouts is working nicely now (see the example script).

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Improved PyGI documentation

As a followup action to my recent Talk about PyGI I now re-used my notes to provide some real wiki documentation.

It would be great if you could add package name info for Fedora/SUSE/etc., and perhaps add more example links for porting different kinds of software! Please also let me know if you have suggestions how to improve the structure of the page.

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PyGTK is dead, long live PyGI! – App Developer Week Talk

On next Monday this cycle’s Ubuntu Application Developer Week classes will start.

The topic that kept me busy most in this cycle was Python gobject-introspection, and porting pygtk2 apps to PyGI (see my initial steps and my report from the PyGI hackfest.)

To spread the love, there will be two talks about this next week: On Monday 17:00 UTC the very Tomeu Vizoso himself will explain what gobject-introspection (“GI”) is, why we need it, and how library developers use it to ship a good and useful GI binding (“typelib”) for application developers. I will then follow up on Tuesday 16:00 UTC about the app developer side, in particular how to use the GI typelibs in Python, and how to port PyGTK2 applications to PyGI.

For the most part these sessions are distribution neutral (we don’t have any special sauce for this in Debian/Ubuntu, it all happened right upstream :-)); only a very small fraction of it (where I explain package names, etc.) will be specific to Debian/Ubuntu, but shouldn’t be hard to apply to other distributions as well.

So please feel invited to join, and bombard us with questions!

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