feat: new errors

common/src/config.rs

@@ -137,13 +137,13 @@ pub fn parse<C: config::Config + 'static>(
                 }
                 builder.add_source_with_priority(source, 1);
             }
-            Err(config::ConfigError::File(e)) => {
-                if key_provided {
-                    return Err(e.into());
+            Err(err) => {
+                if key_provided || !err.is_io() {
+                    return Err(err.into());
                 }
-                tracing::debug!("failed to load config file: {}", e);
+
+                tracing::debug!("failed to load config file: {}", err);
             }
-            Err(e) => return Err(e.into()),
         }
     }
 

config/config/Cargo.toml

@@ -15,8 +15,10 @@ toml = "0"
 clap = { version = "4", features = ["cargo", "string"] }
 convert_case = "0"
 serde = { version = "1", features = ["derive"] }
-serde-value = "0"
 tracing = { version = "0" }
+serde_ignored = "0"
+serde-value = "0"
+serde_path_to_error = "0"
 
 # Derive macro
 config_derive = { path = "../config_derive" }

config/config/example/derive.rs

@@ -1,7 +1,7 @@
 //! Run with: `cargo run --example derive`
 //! Look at the generated code with: `cargo expand --example derive`
 
-use config::{sources, ConfigBuilder};
+use config::{sources, ConfigBuilder, ConfigError};
 
 type TypeAlias = bool;
 
@@ -14,7 +14,7 @@ struct AppConfig {
 }
 
 #[derive(config::Config, Debug, PartialEq, serde::Deserialize, serde::Serialize)]
-#[serde(default)]
+// #[serde(default)]
 struct LoggingConfig {
     level: String,
     json: bool,
@@ -30,11 +30,26 @@ impl Default for LoggingConfig {
 }
 
 fn main() {
-    let mut builder: ConfigBuilder<AppConfig> = ConfigBuilder::new();
-    builder.add_source(sources::CliSource::new().unwrap());
+    match parse() {
+        Ok(config) => println!("{:#?}", config),
+        Err(err) => println!("{:#}", err),
+    }
+}
 
-    match builder.build() {
-        Ok(config) => println!("{:?}", config),
-        Err(e) => eprintln!("error: {:#}", e),
+fn parse() -> Result<AppConfig, ConfigError> {
+    let mut builder = ConfigBuilder::new();
+    builder.add_source(sources::CliSource::new()?);
+    builder.add_source(sources::EnvSource::with_prefix("TEST")?);
+    builder.add_source(sources::FileSource::json(
+        br#"
+    {
+      "optional": null
     }
+    "#
+        .as_slice(),
+    )?);
+
+    let config: AppConfig = builder.build()?;
+
+    Ok(config)
 }