Make editable installation of the project itself explicit

docs/advanced/pyproject_toml.md

@@ -14,8 +14,11 @@ platforms = ["linux-64", "osx-arm64", "osx-64", "win-64"]
 ```
 This is the minimum requirement for pixi to understand and parse the project.
 
-If you use `pixi init` in a folder that has a `pyproject.toml` file, pixi will automatically add the `[tool.pixi.project]` section to the file.
-And will also add some defaults to the `.gitignore` and `.gitattributes` file.
+However, it is recommended you use `pixi init` in a folder that has a `pyproject.toml` file. Pixi will automatically
+
+ - Add the above `[tool.pixi.project]` section to the file, auto-detecting your current platform;
+ - Add the current project as an editable pypi dependency;
+ - Add some defaults to the `.gitignore` and `.gitattributes` file.
 
 ## Python dependency
 The `pyproject.toml` file supports the `requires_python` field.
@@ -144,8 +147,7 @@ test = ["test"]
 ```
 
 ## Build-system section
-The `pyproject.toml` file normally contains a `[build-system]` section.
-Pixi will use this section to install the project (as an editable install, i.e. equivalent to `pip install -e .`) automatically and add it to the lock file.
+The `pyproject.toml` file normally contains a `[build-system]` section. Pixi will use this section to build and install the project if it is added as a path pypi dependency.
 ```toml title="pyproject.toml"
 [build-system]
 requires = ["setuptools", "wheel"]

src/cli/init.rs

@@ -63,6 +63,9 @@ name = "{{ name }}"
 channels = [{%- if channels %}"{{ channels|join("\", \"") }}"{%- endif %}]
 platforms = ["{{ platforms|join("\", \"") }}"]
 
+[tool.pixi.pypi-dependencies]
+{{ name }} = { path = ".", editable = true }
+
 "#;
 
 const GITIGNORE_TEMPLATE: &str = r#"# pixi environments

src/project/manifest/pyproject.rs

@@ -40,7 +40,7 @@ impl PyProjectManifest {
 impl From<PyProjectManifest> for ProjectManifest {
     fn from(item: PyProjectManifest) -> Self {
         // Start by loading the data nested under "tool.pixi" as manifest,
-        // and a reference to the pyproject project table
+        // and create a reference to the 'pyproject.toml' project table
         let mut manifest = item.tool.pixi.clone();
         let pyproject = item.project.as_ref().expect("project table should exist");
 
@@ -69,16 +69,6 @@ impl From<PyProjectManifest> for ProjectManifest {
             }
         }
 
-        // Add the project itself as an editable dependency
-        target.add_pypi_dependency(
-            PyPiPackageName::from_str(&pyproject.name).unwrap(),
-            PyPiRequirement::Path {
-                path: PathBuf::from("."),
-                editable: Some(true),
-                extras: Default::default(),
-            },
-        );
-
         // For each extra group, create a feature of the same name if it does not exist,
         // add dependencies and create corresponding environments if they do not exist
         // TODO: Add solve groups as well?