fs: Add parent() and name() methods

docs/markdown/Fs-module.md

@@ -68,6 +68,8 @@ fs.samefile(x, z)  # true
 
 ## Filename modification
 
+The files need not actually exist yet for this method, as it's just string manipulation.
+
 ### replace_suffix
 
 The `replace_suffix` method is a *string manipulation* convenient for filename modifications.
@@ -101,4 +103,10 @@ original = '/opt/foo.dll.a'
 new = fs.replace_suffix(original, '')  # /opt/foo.dll
 ```
 
-The files need not actually exist yet for this method, as it's just string manipulation.
+### parent
+
+Returns the parent directory (i.e. dirname).
+
+### name
+
+Returns the last component of the path (i.e. basename).

mesonbuild/modules/fs.py

@@ -118,6 +118,23 @@ class FSModule(ExtensionModule):
         new = original.with_suffix(args[1])
         return ModuleReturnValue(str(new), [])
 
+    @stringArgs
+    @noKwargs
+    def parent(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        if len(args) != 1:
+            MesonException('method takes exactly one argument.')
+        original = PurePath(args[0])
+        new = original.parent
+        return ModuleReturnValue(str(new), [])
+
+    @stringArgs
+    @noKwargs
+    def name(self, state: 'ModuleState', args: typing.Sequence[str], kwargs: dict) -> ModuleReturnValue:
+        if len(args) != 1:
+            MesonException('method takes exactly one argument.')
+        original = PurePath(args[0])
+        new = original.name
+        return ModuleReturnValue(str(new), [])
 
 def initialize(*args, **kwargs) -> FSModule:
     return FSModule(*args, **kwargs)

test cases/common/227 fs module/meson.build

@@ -69,4 +69,7 @@ if not is_windows and build_machine.system() != 'cygwin'
   assert(fs.samefile('a_symlink', 'meson.build'), 'symlink samefile fail')
 endif
 
+assert(fs.parent('foo/bar') == 'foo', 'failed to get dirname')
+assert(fs.name('foo/bar') == 'bar', 'failed to get basename')
+
 subdir('subdir')