Add python-source option to [tool.maturin] section of pyproject.toml

Changelog.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Find python module next to `pyproject.toml` if `pyproject.toml` exists in [#1044](https://github.com/PyO3/maturin/pull/1044).
   It's technically a **breaking change**, but previously it doesn't work properly
   if the directory containing `pyproject.toml` isn't recognized as project root.
+* Add `python-source` option to `[tool.maturin]` section of pyproject.toml in [#1046](https://github.com/PyO3/maturin/pull/1046)
 
 ## [0.13.1] - 2022-07-26
 

src/project_layout.rs

@@ -86,6 +86,9 @@ impl ProjectResolver {
             .filter(|name| name.contains('.'))
             .unwrap_or(&module_name);
 
+        let py_src = pyproject
+            .and_then(|x| x.python_source())
+            .or_else(|| extra_metadata.python_source.as_ref().map(Path::new));
         let data = pyproject
             .and_then(|x| x.data())
             .or_else(|| extra_metadata.data.as_ref().map(Path::new));
@@ -94,12 +97,7 @@ impl ProjectResolver {
         } else {
             manifest_dir
         };
-        let project_layout = ProjectLayout::determine(
-            project_root,
-            extension_name,
-            extra_metadata.python_source.as_deref(),
-            data,
-        )?;
+        let project_layout = ProjectLayout::determine(project_root, extension_name, py_src, data)?;
         Ok(Self {
             project_layout,
             cargo_toml_path: manifest_file,

src/pyproject_toml.rs

@@ -25,6 +25,8 @@ pub struct ToolMaturin {
     skip_auditwheel: bool,
     #[serde(default)]
     strip: bool,
+    /// The directory with python module, contains `<module_name>/__init__.py`
+    python_source: Option<PathBuf>,
     /// Path to the wheel directory, defaults to `<module_name>.data`
     data: Option<PathBuf>,
     // Some customizable cargo options
@@ -122,6 +124,12 @@ impl PyProjectToml {
             .unwrap_or_default()
     }
 
+    /// Returns the value of `[tool.maturin.python-source]` in pyproject.toml
+    pub fn python_source(&self) -> Option<&Path> {
+        self.maturin()
+            .and_then(|maturin| maturin.python_source.as_deref())
+    }
+
     /// Returns the value of `[tool.maturin.data]` in pyproject.toml
     pub fn data(&self) -> Option<&Path> {
         self.maturin().and_then(|maturin| maturin.data.as_deref())