Merge pull request #1520 from mesonbuild/tingping/python3-module

Add get_path() and get_version() methods to the python3 module

mesonbuild/modules/python3.py

@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import sys
+import sysconfig
 from .. import mesonlib, dependencies
 
 from . import ExtensionModule
 from mesonbuild.modules import ModuleReturnValue
 
+
 class Python3Module(ExtensionModule):
     def __init__(self):
         super().__init__()
@@ -45,5 +47,25 @@ class Python3Module(ExtensionModule):
         py3 = dependencies.ExternalProgram('python3', sys.executable, silent=True)
         return ModuleReturnValue(py3, [py3])
 
+    def language_version(self, state, args, kwargs):
+        if args or kwargs:
+            raise mesonlib.MesonException('language_version() takes no arguments.')
+        return ModuleReturnValue(sysconfig.get_python_version(), [])
+
+    def sysconfig_path(self, state, args, kwargs):
+        if len(args) != 1:
+            raise mesonlib.MesonException('sysconfig_path() requires passing the name of path to get.')
+        if kwargs:
+            raise mesonlib.MesonException('sysconfig_path() does not accept keywords.')
+        path_name = args[0]
+        valid_names = sysconfig.get_path_names()
+        if path_name not in valid_names:
+            raise mesonlib.MesonException('{} is not a valid path name {}.'.format(path_name, valid_names))
+
+        # Get a relative path without a prefix, e.g. lib/python3.6/site-packages
+        path = sysconfig.get_path(path_name, vars={'base': ''})[1:]
+        return ModuleReturnValue(path, [])
+
+
 def initialize():
     return Python3Module()

test cases/python3/1 basic/meson.build

@@ -3,6 +3,16 @@ project('python sample', 'c')
 py3_mod = import('python3')
 py3 = py3_mod.find_python()
 
+py3_version = py3_mod.language_version()
+if py3_version.version_compare('< 3.2')
+  error('Invalid python version!?')
+endif
+
+py3_purelib = py3_mod.sysconfig_path('purelib')
+if not py3_purelib.endswith('site-packages')
+  error('Python3 purelib path seems invalid?')
+endif
+
 main = files('prog.py')
 
 test('toplevel', py3, args : main)