Improved error handling (part 1)

crates/utils/src/config/mod.rs

@@ -32,6 +32,7 @@ pub enum ConfigWarning {
     AppliedDefault { default: String },
     Unread { value: String },
     Build { error: String },
+    Parse { error: String },
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize)]
@@ -54,7 +55,7 @@ pub struct Rate {
     pub period: Duration,
 }
 
-pub type Result<T> = std::result::Result<T, String>;
+pub(crate) type Result<T> = std::result::Result<T, String>;
 
 impl Config {
     pub async fn resolve_macros(&mut self, classes: &[&str]) {
@@ -206,6 +207,9 @@ impl Config {
                 ConfigWarning::Unread { value } => {
                     format!("WARNING: Unused setting {key:?} with value {value:?}")
                 }
+                ConfigWarning::Parse { error } => {
+                    format!("WARNING: Failed to parse {key:?}: {error}")
+                }
                 ConfigWarning::Build { error } => format!("WARNING for {key:?}: {error}"),
             };
             if !use_stderr {

crates/utils/src/config/utils.rs

@@ -294,6 +294,15 @@ impl Config {
         );
     }
 
+    pub fn new_parse_warning(&mut self, key: impl AsKey, details: impl Into<String>) {
+        self.warnings.insert(
+            key.as_key(),
+            ConfigWarning::Parse {
+                error: details.into(),
+            },
+        );
+    }
+
     pub fn new_build_warning(&mut self, key: impl AsKey, details: impl Into<String>) {
         self.warnings.insert(
             key.as_key(),