arg: fix broken dbpath argument, add test

I broke dbpath, lets fix that and add a test so it doesn't happen again

Signed-off-by: William Casarin <jb55@jb55.com>

src/app.rs

@@ -392,10 +392,11 @@ impl Damus {
             .datapath
             .unwrap_or(data_path.as_ref().to_str().expect("db path ok").to_string());
         let path = DataPath::new(&data_path);
-        let dbpath_ = path.path(DataPathType::Db);
+        let dbpath_str = parsed_args
-        let dbpath = dbpath_.to_str().unwrap();
+            .dbpath
+            .unwrap_or_else(|| path.path(DataPathType::Db).to_str().unwrap().to_string());
 
-        let _ = std::fs::create_dir_all(dbpath);
+        let _ = std::fs::create_dir_all(&dbpath_str);
 
         let imgcache_dir = path.path(DataPathType::Cache).join(ImageCache::rel_dir());
         let _ = std::fs::create_dir_all(imgcache_dir.clone());
@@ -453,7 +454,7 @@ impl Damus {
             .get_selected_account()
             .as_ref()
             .map(|a| a.pubkey.bytes());
-        let ndb = Ndb::new(dbpath, &config).expect("ndb");
+        let ndb = Ndb::new(&dbpath_str, &config).expect("ndb");
 
         let mut columns = if parsed_args.columns.is_empty() {
             if let Some(serializable_columns) = storage::load_columns(&path) {

src/args.rs

@@ -265,6 +265,32 @@ mod tests {
         std::fs::remove_dir_all(path);
     }
 
+    /// Ensure dbpath actually sets the dbpath correctly.
+    #[tokio::test]
+    async fn test_dbpath() {
+        let datapath = create_tmp_dir();
+        let dbpath = create_tmp_dir();
+        let args = vec![
+            "--datapath",
+            &datapath.to_str().unwrap(),
+            "--dbpath",
+            &dbpath.to_str().unwrap(),
+        ]
+        .iter()
+        .map(|s| s.to_string())
+        .collect();
+
+        let ctx = egui::Context::default();
+        let app = Damus::new(&ctx, &datapath, args);
+
+        assert!(Path::new(&dbpath.join("data.mdb")).exists());
+        assert!(Path::new(&dbpath.join("lock.mdb")).exists());
+        assert!(!Path::new(&datapath.join("db")).exists());
+
+        rmrf(datapath);
+        rmrf(dbpath);
+    }
+
     #[tokio::test]
     async fn test_column_args() {
         let tmpdir = create_tmp_dir();