From 5bd36b139d8ba07bce7edb8828beec3f114b3271 Mon Sep 17 00:00:00 2001
From: Mroik <mroik@delayed.space>
Date: Mon, 27 Jan 2025 17:43:32 +0100
Subject: Implement app loop

---
 src/app.rs   | 80 ++++++++++++++++++++++++++++++++++--------------------------
 src/event.rs | 37 ++++++++++++++++++++++++++++
 src/main.rs  |  7 +++++-
 3 files changed, 88 insertions(+), 36 deletions(-)

(limited to 'src')

diff --git a/src/app.rs b/src/app.rs
index f0ffff0..7ba3da8 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1,21 +1,26 @@
 use std::{
     error::Error,
     io::{stdout, Stdout},
-    time::Duration,
 };
 
-use crossterm::event::{poll, read, KeyCode, KeyModifiers};
+use crossterm::{
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+    ExecutableCommand,
+};
 use rand::Rng;
-use tokio::sync::mpsc::{channel, Receiver, Sender};
+use tokio::{
+    spawn,
+    sync::mpsc::{channel, Receiver, Sender},
+};
 
-use crate::event::Event;
+use crate::event::{handle_input, Event};
 
-const TICK_RATE: u64 = 1000 / 20;
+pub const TICK_RATE: u64 = 1000 / 20;
 
 pub struct App {
     stdout: Stdout,
     quote: Vec<String>,
-    event_tx: Sender<Event>,
+    pub event_tx: Sender<Event>,
     event_rx: Receiver<Event>,
     running: bool,
 }
@@ -34,39 +39,44 @@ impl App {
         }
     }
 
-    pub async fn run(&mut self) {
-        todo!()
-    }
+    pub async fn run(&mut self) -> Result<(), Box<dyn Error>> {
+        self.stdout.execute(EnterAlternateScreen)?;
+        enable_raw_mode()?;
+
+        let (ks_tx, ks_rx): (Sender<()>, Receiver<()>) = channel(1);
+        let ev = self.event_tx.clone();
+        spawn(async {
+            start_input_handler(ev, ks_rx).await;
+        });
 
-    // TODO
-    // - [ ] Pause on focus lost
-    // - [ ] Invalidate on paste
-    async fn handle_input(&mut self) -> Result<(), Box<dyn Error>> {
+        self.running = true;
         while self.running {
-            if poll(Duration::from_millis(TICK_RATE))? {
-                match read()? {
-                    //crossterm::event::Event::FocusGained => todo!(),
-                    //crossterm::event::Event::FocusLost => todo!(),
-                    //crossterm::event::Event::Paste(_) => todo!(),
-                    crossterm::event::Event::Key(key_event) => {
-                        if key_event.code == KeyCode::Char('c')
-                            && key_event.modifiers == KeyModifiers::CONTROL
-                        {
-                            self.event_tx.send(Event::Terminate).await?;
-                            continue;
-                        }
-                        if key_event.code == KeyCode::Backspace {
-                            self.event_tx.send(Event::Backspace).await?;
-                            continue;
-                        }
-                        if let KeyCode::Char(c) = key_event.code {
-                            self.event_tx.send(Event::KeyPress(c)).await?;
-                        }
-                    }
-                    _ => (),
-                }
+            self.process().await?;
+        }
+        let _ = ks_tx.send(());
+
+        disable_raw_mode()?;
+        self.stdout.execute(LeaveAlternateScreen)?;
+        return Ok(());
+    }
+
+    async fn process(&mut self) -> Result<(), Box<dyn Error>> {
+        match self.event_rx.recv().await.unwrap() {
+            Event::Terminate => {
+                self.running = false;
             }
+            Event::KeyPress(_) => todo!(),
+            Event::Backspace => todo!(),
         }
         return Ok(());
     }
 }
+
+async fn start_input_handler(ev: Sender<Event>, mut kill_switch: Receiver<()>) {
+    loop {
+        tokio::select! {
+        _ = handle_input(&ev) => (),
+        _ = kill_switch.recv() => return,
+        }
+    }
+}
diff --git a/src/event.rs b/src/event.rs
index 1320c68..d5cdabe 100644
--- a/src/event.rs
+++ b/src/event.rs
@@ -1,5 +1,42 @@
+use std::{error::Error, time::Duration};
+
+use crossterm::event::{poll, read, KeyCode, KeyModifiers};
+use tokio::sync::mpsc::Sender;
+
+use crate::app::TICK_RATE;
+
 pub enum Event {
     Terminate,
     KeyPress(char),
     Backspace,
 }
+
+// TODO
+// - [ ] Pause on focus lost
+// - [ ] Invalidate on paste
+pub async fn handle_input(sender: &Sender<Event>) -> Result<(), Box<dyn Error>> {
+    if poll(Duration::from_millis(TICK_RATE))? {
+        match read()? {
+            //crossterm::event::Event::FocusGained => todo!(),
+            //crossterm::event::Event::FocusLost => todo!(),
+            //crossterm::event::Event::Paste(_) => todo!(),
+            crossterm::event::Event::Key(key_event) => {
+                if key_event.code == KeyCode::Char('c')
+                    && key_event.modifiers == KeyModifiers::CONTROL
+                {
+                    sender.send(Event::Terminate).await?;
+                    return Ok(());
+                }
+                if key_event.code == KeyCode::Backspace {
+                    sender.send(Event::Backspace).await?;
+                    return Ok(());
+                }
+                if let KeyCode::Char(c) = key_event.code {
+                    sender.send(Event::KeyPress(c)).await?;
+                }
+            }
+            _ => (),
+        }
+    }
+    return Ok(());
+}
diff --git a/src/main.rs b/src/main.rs
index ba5277e..0365d5b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,6 +3,7 @@ pub mod event;
 
 use std::{error::Error, fs::read_to_string, path::Path};
 
+use app::App;
 use clap::Parser;
 
 #[derive(Parser)]
@@ -44,8 +45,12 @@ fn generate_quotes(path: &Path) -> Result<Vec<Vec<String>>, Box<dyn Error>> {
 }
 
 #[tokio::main]
-async fn main() {
+async fn main() -> Result<(), Box<dyn Error>> {
     let args = Args::parse();
     let path = Path::new(&args.quote_folder);
     let quotes = generate_quotes(&path).unwrap();
+    let mut app = App::new(&quotes);
+
+    app.run().await?;
+    return Ok(());
 }
-- 
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