Partial AppState rewrite

src/data_provider/sqlite.rs

@@ -1,5 +1,6 @@
 use crate::fs::*;
 use rusqlite::Connection;
+use std::ops::{Deref, DerefMut};
 
 pub fn create_db() {
     let db_file = db_path();
@@ -84,3 +85,29 @@ pub fn default_connection() -> Connection {
         .expect("Failed to set PRAGMA");
     connection
 }
+
+pub struct SqliteConnection(Option<Connection>);
+impl Deref for SqliteConnection {
+    type Target = Connection;
+    fn deref(&self) -> &Self::Target {
+        self.0.as_ref().unwrap()
+    }
+}
+
+impl DerefMut for SqliteConnection {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        self.0.as_mut().unwrap()
+    }
+}
+
+impl Default for SqliteConnection {
+    fn default() -> Self {
+        SqliteConnection(Some(default_connection()))
+    }
+}
+
+impl SqliteConnection {
+    pub fn finish(&mut self) {
+        self.0 = None;
+    }
+}