Thiserror and remove demo python code

rir_generator/Cargo.toml

@@ -8,3 +8,4 @@ edition = "2021"
 [dependencies]
 itertools = "0.10.5"
 ndarray = "0.15.6"
+thiserror = "1.0.50"

rir_generator/src/lib.rs

@@ -2,9 +2,9 @@
 extern crate itertools;
 
 use ndarray;
+use thiserror::Error;
 use std::f64::consts::PI;
 use std::f64::EPSILON;
-use std::fmt;
 
 #[derive(Debug, Clone)]
 pub enum MicrophoneType {
@@ -27,21 +27,14 @@ impl Into<f64> for MicrophoneType {
     }
 }
 
-#[derive(Debug, Clone)]
-pub struct BadCharError {
-    pub char: char,
-}
-
-impl std::error::Error for BadCharError {}
-
-impl fmt::Display for BadCharError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "Incorrect microphone character {}", self.char)
-    }
+#[derive(Error, Debug)]
+pub enum MicrophoneTypeError {
+    #[error("Incorrect microphone character {0}")]
+    BadCharError(char)
 }
 
 impl TryFrom<char> for MicrophoneType {
-    type Error = BadCharError;
+    type Error = MicrophoneTypeError;
 
     fn try_from(x: char) -> Result<Self, Self::Error> {
         match x {
@@ -50,7 +43,7 @@ impl TryFrom<char> for MicrophoneType {
             'c' => Ok(Self::Cardioid),
             's' => Ok(Self::Subcardioid),
             'o' => Ok(Self::Omnidirectional),
-            _ => Err(BadCharError { char: x }),
+            _ => Err(Self::Error::BadCharError(x)),
         }
     }
 }

rir_generator_py/src/lib.rs

@@ -3,12 +3,6 @@ use pyo3::exceptions::PyValueError;
 use pyo3::prelude::*;
 use rir_generator;
 
-/// Formats the sum of two numbers as string.
-#[pyfunction]
-fn sum_as_string(a: usize, b: usize) -> PyResult<String> {
-    Ok((a + b).to_string())
-}
-
 #[pyfunction]
 fn compute_rir(
     _py: Python,
@@ -48,7 +42,6 @@ fn compute_rir(
 /// A Python module implemented in Rust.
 #[pymodule]
 fn rir_generator_py(_py: Python, m: &PyModule) -> PyResult<()> {
-    m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
     m.add_function(wrap_pyfunction!(compute_rir, m)?)?;
     Ok(())
 }