Add cleaning up old repos to the clean command.

src/command/clean/runner.rs

@@ -8,7 +8,12 @@ use crate::config::Config;
 
 pub(crate) async fn run_clean(args: CleanArgs) -> Result<()> {
     let config = Config::load_from_file(args.config).await?;
+    clean_targets(&config).await?;
+    clean_repos(&config).await?;
+    Ok(())
+}
 
+async fn clean_targets(config: &Config) -> Result<()> {
     let target_directory = config.get_target_root_directory()?;
     let existing_target_names = {
         let mut existing_entries = tokio::fs::read_dir(&target_directory).await?;
@@ -41,3 +46,35 @@ pub(crate) async fn run_clean(args: CleanArgs) -> Result<()> {
 
     Ok(())
 }
+
+async fn clean_repos(config: &Config) -> Result<()> {
+    let repo_directory = config.get_repo_root_directory()?;
+    let existing_repo_names = {
+        let mut existing_entries = tokio::fs::read_dir(&repo_directory).await?;
+        let mut existing_repo_names = HashSet::new();
+        while let Some(existing_repo) = existing_entries.next_entry().await? {
+            existing_repo_names.insert(existing_repo.file_name());
+        }
+        existing_repo_names
+    };
+
+    let configured_repo_names = config
+        .get_target_configs()
+        .iter()
+        .map(|target| {
+            target.get_repo_directory(&config).and_then(|repo_path| {
+                repo_path
+                    .file_name()
+                    .map(|name| name.to_os_string())
+                    .ok_or("Entry with no file name in repo directory.".into())
+            })
+        })
+        .collect::<Result<HashSet<_>>>()?;
+
+    for dir in existing_repo_names.difference(&configured_repo_names) {
+        info!("DELETE REPO: {:?}", dir);
+        tokio::fs::remove_dir_all(repo_directory.join(dir)).await?;
+    }
+
+    Ok(())
+}