Better error handling

src/config.rs

@@ -1,14 +1,11 @@
 use crate::{gtfs, renderer};
-use std::collections::HashSet;
-extern crate serde_derive;
-extern crate serde_yaml;
+use serde::{Serialize, Deserialize};
+use std::fs;
+use yaml_serde;
 
-struct Error {
-    message: String
-}
 
 #[derive(Debug, PartialEq, Serialize, Deserialize)]
-struct Config {
+pub struct Config {
     #[serde(rename = "gtfs")]
     pub gtfs_prefs: gtfs::structs::Preferences,
 
@@ -16,7 +13,39 @@ struct Config {
     pub screen_prefs: renderer::structs::Prefs,
 }
 
+#[derive (Debug)]
+pub struct Error {
+    pub message: String
+}
+
+
+impl From<std::io::Error> for Error {
+    fn from(value: std::io::Error) -> Self {
+        return Error {
+            message: value.to_string(),
+        };
+    }
+}
+
+impl From<yaml_serde::Error> for Error {
+    fn from(value: yaml_serde::Error) -> Self {
+        return Error {
+            message: value.to_string(),
+        }
+    }
+}
+
+impl From<sdl3::Error> for Error {
+    fn from(value: sdl3::Error) -> Self {
+        return Error {
+            message: value.to_string(),
+        }
+    }
+}
+
 
 pub fn load_config(config_name: String) -> Result<Config, Error> {
-    return Err(Error { message: String::from("Foo") });
+    let config_text = fs::read_to_string(config_name)?;
+    let config = yaml_serde::from_str(config_text.as_ref())?;
+    return Ok(config);
 }