feat: make erg_compiler available as a Python lib

crates/erg_parser/Cargo.toml

@@ -19,6 +19,7 @@ pretty = ["erg_common/pretty"]
 large_thread = ["erg_common/large_thread"]
 experimental = ["erg_common/experimental"]
 pylib = ["dep:pyo3", "erg_common/pylib"]
+pylib_parser = ["pylib"]
 
 [dependencies]
 erg_common = { workspace = true }

crates/erg_parser/README.md

@@ -15,8 +15,17 @@ for chunk in module:
         assert chunk.sig.inspect() == "x"
 ```
 
-### Debug install
+### Debug install (using venv)
 
 ```python
-maturin develop --features pylib
+python -m venv .venv
+source .venv/bin/activate
+maturin develop --features pylib_parser
+```
+
+### Release install
+
+```python
+maturin build -i python --release --features pylib_parser
+pip install <output wheel>
 ```

crates/erg_parser/lib.rs

@@ -30,7 +30,7 @@ fn _parse(code: String) -> Result<ast::Module, error::ParseErrors> {
         .map_err(|iart| iart.errors)
 }
 
-#[cfg(feature = "pylib")]
+#[cfg(feature = "pylib_parser")]
 #[pymodule]
 fn erg_parser(py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(_parse, m)?)?;