Refactor configuration to have sources in their own section

src/main.rs

@@ -27,15 +27,15 @@ mod reddit_client;
 mod schema;
 
 #[derive(Debug, Serialize, Deserialize)]
-struct SectionConfig {
+struct SourceConfig {
     username: String,
     title_filter: Option<String>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]
 struct Config {
-    #[serde(flatten)]
-    sections: HashMap<String, SectionConfig>,
+    #[serde(default)]
+    sources: HashMap<String, SourceConfig>,
 }
 
 #[derive(Debug)]
@@ -152,13 +152,13 @@ async fn main() -> Result<()> {
         .extract()
         .wrap_err_with(|| "Invalid configuration or insufficient command line arguments")?;
 
-    if conf.sections.is_empty() {
-        return Err(eyre!("No configuration sections found. Please add at least one section to your configuration file.").into());
+    if conf.sources.is_empty() {
+        return Err(eyre!("No sources found in configuration. Please add at least one source to your configuration file.").into());
     }
 
     let mut unique_usernames = HashSet::new();
-    for (_, section_config) in &conf.sections {
-        unique_usernames.insert(section_config.username.clone());
+    for (_, source_config) in &conf.sources {
+        unique_usernames.insert(source_config.username.clone());
     }
 
     let reddit_client = RedditClient::new();
@@ -168,11 +168,11 @@ async fn main() -> Result<()> {
         user_posts.insert_many(username, submissions);
     }
 
-    for (section_name, section_config) in conf.sections {
-        println!("\nProcessing section [{}]", section_name);
+    for (source_name, source_config) in conf.sources {
+        println!("\nProcessing source [{}]", source_name);
 
-        let username = section_config.username.clone();
-        let title_filter = match section_config.title_filter {
+        let username = source_config.username.clone();
+        let title_filter = match source_config.title_filter {
             Some(filter) => Some(
                 Regex::new(filter.as_str())
                     .context(format!("Invalid regex pattern: {}", filter))?,