Fix dependencies, and remove optional get_requires_for_build_sdist/wheel hooks

Closes mesonbuildgh-56

Author: rgommers

mesonpy/__init__.py

@@ -51,13 +51,6 @@
 __version__ = '0.4.0'
 
 
-class _depstr:
-    ninja = 'ninja >= 1.10.0'
-    patchelf_wrapper = 'patchelf-wrapper'
-    pep621 = 'pep621 >= 0.3.0'
-    wheel = 'wheel >= 0.36.0'  # noqa: F811
-
-
 _COLORS = {
     'cyan': '\33[36m',
     'yellow': '\33[93m',
@@ -762,16 +755,6 @@ def _project(config_settings: Optional[Dict[Any, Any]]) -> Iterator[Project]:
         yield project
 
 
-def get_requires_for_build_sdist(
-    config_settings: Optional[Dict[Any, Any]] = None,
-) -> List[str]:
-    dependencies = []
-    with _project(config_settings) as project:
-        if project.pep621:
-            dependencies.append(_depstr.pep621)
-    return dependencies
-
-
 def build_sdist(
     sdist_directory: str,
     config_settings: Optional[Dict[Any, Any]] = None,
@@ -783,18 +766,6 @@ def build_sdist(
         return project.sdist(out).name
 
 
-def get_requires_for_build_wheel(
-    config_settings: Optional[Dict[str, str]] = None,
-) -> List[str]:
-    dependencies = [_depstr.wheel, _depstr.ninja]
-    with _project(config_settings) as project:
-        if not project.is_pure and platform.system() == 'Linux':
-            dependencies.append(_depstr.patchelf_wrapper)
-        if project.pep621:
-            dependencies.append(_depstr.pep621)
-    return dependencies
-
-
 def build_wheel(
     wheel_directory: str,
     config_settings: Optional[Dict[Any, Any]] = None,

pyproject.toml

@@ -27,7 +27,10 @@ classifiers = [
 dependencies = [
   'colorama; os_name == "nt"',
   'meson>=0.60.0',
-  'ninja',
+  'ninja >= 1.10.0',
+  'pep621 >= 0.4.0',
+  'patchelf-wrapper, sys_platform == "linux"',  # FIXME: broken package, see gh-52
+  'wheel >= 0.36.0',
   'tomli>=1.0.0',
   'typing-extensions>=3.7.4; python_version<"3.8"',
 ]
@@ -38,8 +41,7 @@ test = [
   'pytest-cov',
   'pytest-mock',
   'GitPython',
-  'auditwheel',
-  'pep621 >= 0.4.0',
+  'auditwheel',  # unused as of now
 ]
 docs = [
   'furo>=2021.08.31',