Add CursiveExt trait

For easier usage of shared logic involving the `Cursive` instance.

src/commands.rs

@@ -7,6 +7,7 @@ use crate::command::{
 };
 use crate::config::Config;
 use crate::events::EventManager;
+use crate::ext_traits::CursiveExt;
 use crate::library::Library;
 use crate::queue::{Queue, RepeatSetting};
 use crate::spotify::{Spotify, VOLUME_PERCENT};
@@ -310,10 +311,7 @@ impl CommandManager {
         } else if let Some(mut play_track) = s.find_name::<PlayTrackMenu>("playtrackmenu") {
             play_track.on_command(s, cmd)?
         } else {
-            let mut main = s
-                .find_name::<Layout>("main")
-                .expect("could not find layout");
-            main.on_command(s, cmd)?
+            s.on_layout(|siv, mut l| l.on_command(siv, cmd))?
         };
 
         if let CommandResult::Consumed(output) = local {

src/ext_traits.rs

@@ -0,0 +1,21 @@
+use cursive::views::ViewRef;
+
+use crate::ui::layout::Layout;
+
+pub trait CursiveExt {
+    fn on_layout<F, R>(&mut self, cb: F) -> R
+    where
+        F: FnOnce(&mut cursive::Cursive, ViewRef<Layout>) -> R;
+}
+
+impl CursiveExt for cursive::Cursive {
+    fn on_layout<F, R>(&mut self, cb: F) -> R
+    where
+        F: FnOnce(&mut cursive::Cursive, ViewRef<Layout>) -> R,
+    {
+        let layout = self
+            .find_name::<Layout>("main")
+            .expect("Could not find Layout");
+        cb(self, layout)
+    }
+}

src/main.rs

@@ -23,6 +23,7 @@ mod command;
 mod commands;
 mod config;
 mod events;
+mod ext_traits;
 mod library;
 mod model;
 mod queue;
@@ -44,6 +45,7 @@ use crate::command::{Command, JumpMode};
 use crate::commands::CommandManager;
 use crate::config::Config;
 use crate::events::{Event, EventManager};
+use crate::ext_traits::CursiveExt;
 use crate::library::Library;
 use crate::spotify::PlayerEvent;
 use crate::ui::contextmenu::ContextMenu;
@@ -282,10 +284,7 @@ async fn main() -> Result<(), String> {
     {
         let ev = event_manager.clone();
         layout.cmdline.set_on_submit(move |s, cmd| {
-            {
-                let mut main = s.find_name::<ui::layout::Layout>("main").unwrap();
-                main.clear_cmdline();
-            }
+            s.on_layout(|_, mut layout| layout.clear_cmdline());
             let cmd_without_prefix = &cmd[1..];
             if cmd.strip_prefix('/').is_some() {
                 let command = Command::Jump(JumpMode::Query(cmd_without_prefix.to_string()));
@@ -302,8 +301,7 @@ async fn main() -> Result<(), String> {
                         }
                     }
                     Err(err) => {
-                        let mut main = s.find_name::<ui::layout::Layout>("main").unwrap();
-                        main.set_result(Err(err.to_string()));
+                        s.on_layout(|_, mut layout| layout.set_result(Err(err.to_string())));
                     }
                 }
             }