Implement StateDirectory methods.

Author: artob

src/directory/config_directory.rs

@@ -5,7 +5,7 @@ use pyo3::{exceptions::PyRuntimeError, prelude::*, types::PyString};
 
 /// A configuration directory stored on a file system (e.g., `$HOME/.asimov/configs/`).
 #[pyclass(frozen, module = "asimov", str = "{0}")]
-pub struct ConfigDirectory(FsConfigDirectory);
+pub struct ConfigDirectory(pub(crate) FsConfigDirectory);
 
 #[pymethods]
 impl ConfigDirectory {

src/directory/module_directory.rs

@@ -5,7 +5,7 @@ use pyo3::{exceptions::PyRuntimeError, prelude::*, types::PyString};
 
 /// A module directory stored on a file system (e.g., `$HOME/.asimov/modules/`).
 #[pyclass(frozen, module = "asimov", str = "{0}")]
-pub struct ModuleDirectory(FsModuleDirectory);
+pub struct ModuleDirectory(pub(crate) FsModuleDirectory);
 
 #[pymethods]
 impl ModuleDirectory {

src/directory/program_directory.rs

@@ -5,7 +5,7 @@ use pyo3::{exceptions::PyRuntimeError, prelude::*, types::PyString};
 
 /// A program directory stored on a file system (e.g., `$HOME/.asimov/libexec/`).
 #[pyclass(frozen, module = "asimov", str = "{0}")]
-pub struct ProgramDirectory(FsProgramDirectory);
+pub struct ProgramDirectory(pub(crate) FsProgramDirectory);
 
 #[pymethods]
 impl ProgramDirectory {

src/directory/state_directory.rs

@@ -1,11 +1,12 @@
 // This is free and unencumbered software released into the public domain.
 
+use super::{ConfigDirectory, ModuleDirectory, ProgramDirectory};
 use asimov_directory::{StateDirectory as _, fs::StateDirectory as FsStateDirectory};
 use pyo3::{exceptions::PyRuntimeError, prelude::*, types::PyString};
 
 /// A state directory stored on a file system (e.g., `$HOME/.asimov/`).
 #[pyclass(frozen, module = "asimov", str = "{0}")]
-pub struct StateDirectory(FsStateDirectory);
+pub struct StateDirectory(pub(crate) FsStateDirectory);
 
 #[pymethods]
 impl StateDirectory {
@@ -51,4 +52,34 @@ impl StateDirectory {
     pub fn has_programs(&self) -> bool {
         self.0.has_programs()
     }
+
+    /// Opens the configuration directory under this state directory.
+    pub fn configs(&self) -> PyResult<ConfigDirectory> {
+        let Ok(result) = self.0.configs() else {
+            Err(PyErr::new::<PyRuntimeError, _>(
+                "Failed to open configuration directory", // TODO
+            ))?
+        };
+        Ok(ConfigDirectory(result))
+    }
+
+    /// Opens the module directory under this state directory.
+    pub fn modules(&self) -> PyResult<ModuleDirectory> {
+        let Ok(result) = self.0.modules() else {
+            Err(PyErr::new::<PyRuntimeError, _>(
+                "Failed to open module directory", // TODO
+            ))?
+        };
+        Ok(ModuleDirectory(result))
+    }
+
+    /// Opens the program directory under this state directory.
+    pub fn programs(&self) -> PyResult<ProgramDirectory> {
+        let Ok(result) = self.0.programs() else {
+            Err(PyErr::new::<PyRuntimeError, _>(
+                "Failed to open program directory", // TODO
+            ))?
+        };
+        Ok(ProgramDirectory(result))
+    }
 }