Logging (#8)

- Add `Logger`, `Config`
- Back to `nixos-unstable`
- `nix flake update`

src/main.rs

@@ -1,7 +1,11 @@
 mod app;
 mod clock;
+mod config;
 mod constants;
 mod events;
+#[cfg(debug_assertions)]
+mod logging;
+
 mod terminal;
 mod utils;
 mod widgets;
@@ -11,11 +15,16 @@ use color_eyre::Result;
 
 #[tokio::main]
 async fn main() -> Result<()> {
-    color_eyre::install()?;
-    let terminal = terminal::init()?;
+    let config = config::Config::init()?;
+    #[cfg(debug_assertions)]
+    logging::Logger::new(config.log_dir).init()?;
 
+    color_eyre::install()?;
+
+    let terminal = terminal::setup()?;
     let events = events::Events::new();
     App::new().run(terminal, events).await?;
-    terminal::restore()?;
+    terminal::teardown()?;
+
     Ok(())
 }