[fixup]: write documentation

docs/markdown/Python-module.md

@@ -0,0 +1,195 @@
+---
+short-description: Generic python module
+authors:
+    - name: Mathieu Duponchelle
+      email: mathieu@centricular.com
+      years: [2018]
+      has-copyright: false
+...
+
+# Python module
+
+This module provides support for finding and building extensions against
+python installations, be they python 2 or 3.
+
+*Added 0.46.0*
+
+## Functions
+
+### `find_installation()`
+
+``` meson
+pymod.find_installation(name_or_path, ...)
+```
+
+Find a python installation matching `name_or_path`.
+
+That argument is optional, if not provided then the returned python
+installation will be the one used to run meson.
+
+If provided, it can be:
+
+- A simple name, eg `python-2.7`, meson will look for an external program
+  named that way, using [find_program]
+
+- A path, eg `/usr/local/bin/python3.4m`
+
+- One of `python2` or `python3`: in either case, the module will try some
+  alternative names: `py -2` or `py -3` on Windows, and `python` everywhere.
+  In the latter case, it will check whether the version provided by the
+  sysconfig module matches the required major version
+
+Keyword arguments are the following:
+
+- `required`: by default, `required` is set to `true` and Meson will
+  abort if no python installation can be found. If `required` is set to `false`,
+  Meson will continue even if no python installation was found. You can
+  then use the `.found()` method on the returned object to check
+  whether it was found or not.
+
+**Returns**: a [python installation][`python_installation` object]
+
+## `python_installation` object
+
+The `python_installation` object is an [external program], with several
+added methods.
+
+### Methods
+
+#### `extension_module()`
+
+``` meson
+shared_module py_installation.extension_module(module_name, list_of_sources, ...)
+```
+
+Create a `shared_module` target that is named according to the naming
+conventions of the target platform.
+
+All positional and keyword arguments are the same as for [shared_module],
+excluding `name_suffix` and `name_prefix`, and with the addition of the following:
+
+- `subdir`: By default, meson will install the extension module in
+  the relevant top-level location for the python installation, eg
+  `/usr/lib/site-packages`. When subdir is passed to this method,
+  it will be appended to that location. This keyword argument is
+  mutually exclusive with `install_dir`
+
+`extension_module` does not add any dependencies to the library so user may
+need to add `dependencies : py_installation.dependency()`, see [][`dependency()`].
+
+**Returns**: a [buildtarget object]
+
+#### `dependency()`
+
+``` meson
+python_dependency py_installation.dependency(...)
+```
+
+This method accepts the same arguments as the standard [dependency] function.
+
+**Returns**: a [python dependency][`python_dependency` object]
+
+#### `install_sources()`
+
+``` meson
+void py_installation.install_sources(list_of_files, ...)
+```
+
+Install actual python sources (`.py`).
+
+All positional and keyword arguments are the same as for [install_data],
+with the addition of the following:
+
+- `pure`: On some platforms, architecture independent files are expected
+  to be placed in a separate directory. However, if the python sources
+  should be installed alongside an extension module built with this
+  module, this keyword argument can be used to override that behaviour.
+  Defaults to `true`
+
+- `subdir`: See documentation for the argument of the same name to
+  [][`extension_module()`]
+
+#### `get_install_dir()`
+
+``` meson
+string py_installation.get_install_dir(...)
+```
+
+Retrieve the directory [][`install_sources()`] will install to.
+
+It can be useful in cases where `install_sources` cannot be used directly,
+for example when using [configure_file].
+
+This function accepts no arguments, its keyword arguments are the same
+as [][`install_sources()`].
+
+**Returns**: A string
+
+#### `language_version()`
+
+``` meson
+string py_installation.language_version()
+```
+
+Get the major.minor python version, eg `2.7`.
+
+The version is obtained through the `sysconfig` module.
+
+This function expects no arguments or keyword arguments.
+
+**Returns**: A string
+
+#### `get_path()`
+
+``` meson
+string py_installation.get_path(path_name)
+```
+
+Get a path as defined by the `sysconfig` module.
+
+For example:
+
+``` meson
+purelib = py_installation.get_path('purelib')
+```
+
+This function accepts a single argument, `path_name`, which is expected to
+be a non-empty string.
+
+**Returns**: A string
+
+#### `get_variable()`
+
+``` meson
+string py_installation.get_variable(variable_name)
+```
+
+Get a variable as defined by the `sysconfig` module.
+
+For example:
+
+``` meson
+py_bindir = py_installation.get_variable('BINDIR')
+```
+
+This function accepts a single argument, `variable_name`, which is expected to
+be a non-empty string.
+
+**Returns**: A string
+
+## `python_dependency` object
+
+This [dependency object] subclass will try various methods to obtain the
+compiler and linker arguments, starting with pkg-config then potentially
+using information obtained from python's `sysconfig` module.
+
+It exposes the same methods as its parent class.
+
+[find_program]: Reference-manual.md#find_program
+[shared_module]: Reference-manual.md#shared_module
+[external program]: Reference-manual.md#external-program-object
+[dependency]: Reference-manual.md#dependency
+[install_data]: Reference-manual.md#install-data
+[configure_file]: Reference-manual.md#configure-file
+[dependency object]: Reference-manual.md#dependency-object
+[buildtarget object]: Reference-manual.md#build-target-object

docs/markdown/snippets/python-module.md

@@ -0,0 +1,6 @@
+# Generic python module
+
+This is a revamped and generic (python 2 and 3) version of the python3
+module. With this new interface, projects can now fully specify the version
+of python they want to build against / install sources to, and can do so
+against multiple major or minor versions in parallel.

docs/sitemap.txt

@@ -32,6 +32,7 @@ index.md
 			i18n-module.md
 			Icestorm-module.md
 			Pkgconfig-module.md
+			Python-module.md
 			Python-3-module.md
 			Qt4-module.md
 			Qt5-module.md

docs/theme/extra/templates/navbar_links.html

@@ -8,6 +8,7 @@
 		@for tup in (("Gnome-module.html","GNOME"), \
 			     ("i18n-module.html","i18n"), \
 			     ("Pkgconfig-module.html","Pkgconfig"), \
+			     ("Python-module.html","Python"), \
 			     ("Python-3-module.html","Python 3"), \
 			     ("Qt4-module.html","Qt4"), \
 			     ("Qt5-module.html","Qt5"), \