feat(ui/repl): Get the development repl into a useful shape

This repl is not really meant for user, as it's quite features striped.
Its main goal is to enable a faster debugging turnabout time.

src/app/events/handlers/command.rs

@@ -179,7 +179,6 @@ pub async fn handle<U: TrinitrixUi>(
                     }
                     Raw::send_input_unprocessed { input } => {
                         let key = Key::from_str(input.as_str())?;
-                        // let cross_input: Event = key.try_into()?;
 
                         match app.status.state() {
                             State::Insert | State::Command => {

src/main.rs

@@ -2,6 +2,7 @@ mod app;
 mod cli;
 mod ui;
 
+use anyhow::Context;
 use clap::Parser;
 
 use crate::{
@@ -18,13 +19,13 @@ async fn main() -> anyhow::Result<()> {
     match command {
         Command::Start {} => {
             todo!("The full ui is not yet finished");
-            let mut app = app::App::new(Repl::new())?;
+            let mut app = app::App::new(Repl::new()?)?;
 
             // NOTE(@soispha): The `None` here is temporary <2024-05-03>
             app.run(None, args.plugin_path).await?;
         }
         Command::Repl {} => {
-            let mut app = app::App::new(Repl::new())?;
+            let mut app = app::App::new(Repl::new().context("Failed to setup repl")?)?;
 
             // NOTE(@soispha): The `None` here is temporary <2024-05-03>
             app.run(None, args.plugin_path).await?;

src/ui/repl/mod.rs

@@ -1,51 +1,128 @@
-use anyhow::Result;
-use cli_log::info;
+use std::io::{self, Stdout, Write};
+
+use anyhow::{Context, Result};
+use cli_log::{debug, info};
+use crossterm::{
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode, EnableLineWrap},
+};
 use keymaps::key_repr::{Key, KeyValue};
 
-use crate::app::status::Status;
+use crate::app::status::{State, Status};
 
 use super::ui_trait::TrinitrixUi;
 
 pub struct Repl {
+    current_written_buffer: String,
     current_input: String,
     enter_new_line: bool,
+    stdout: Stdout,
 }
 
 impl Repl {
-    pub fn new() -> Self {
-        println!("Welcome to the Trinitrix repl! You can now enter trinitry commands.");
-        print!("{}", Self::prompt(&Status::new()));
+    pub fn new() -> Result<Self> {
+        enable_raw_mode().context("Failed to enable raw mode")?;
+        let mut stdout = io::stdout();
 
-        Repl {
+        write!(
+            stdout,
+            "Welcome to the Trinitrix repl! You can now enter trinitry commands."
+        )?;
+        write!(stdout, "\n\r{}", Self::prompt(&Status::new()))?;
+        stdout.flush()?;
+
+        Ok(Repl {
+            current_written_buffer: String::new(),
             current_input: String::new(),
             enter_new_line: false,
-        }
+            stdout,
+        })
     }
     pub fn prompt(status: &Status) -> String {
         format!("{}> ", status.state())
     }
 }
 
+impl Drop for Repl {
+    fn drop(&mut self) {
+        disable_raw_mode().expect("Must work in drop");
+        execute!(io::stdout(), EnableLineWrap).expect("Must also work");
+
+        writeln!(self.stdout, "\n\rBye!").expect("Must also work");
+    }
+}
+
 impl TrinitrixUi for Repl {
     async fn update(&mut self, status: &Status) -> Result<()> {
         if self.enter_new_line {
-            info!("Got '{}' from user in repl.", self.current_input);
+            info!("Got '{}' from user in repl.", self.current_written_buffer);
+
+            if status.state() == &State::Command {
+                write!(
+                    self.stdout,
+                    "\n\rEvaluating: '{}' ..",
+                    self.current_written_buffer
+                )?;
+            } else {
+                write!(
+                    self.stdout,
+                    "\n\rCan't insert anything in the repl besides in command mode!",
+                )?;
+            }
 
             self.enter_new_line = false;
-            self.current_input = String::new();
+            self.current_written_buffer.clear();
 
-            print!("{}", Self::prompt(status));
+            write!(self.stdout, "\n\r{}", Self::prompt(status))?;
+        } else {
+            write!(
+                self.stdout,
+                "\r{}{}{}",
+                Self::prompt(status),
+                self.current_written_buffer,
+                self.current_input
+            )?;
+
+            self.current_written_buffer += self.current_input.as_str();
+            self.current_input.clear();
         }
+        self.stdout.flush()?;
 
         Ok(())
     }
 
     fn input(&mut self, input: Key) {
+        debug!("Input received at repl: {}", input);
+
         if let Some(value) = input.value() {
-            if let KeyValue::Char(ch) = value {
-                self.current_input.push(*ch);
-            } else if let KeyValue::Enter = value {
-                self.enter_new_line = true;
+            match value {
+                KeyValue::Backspace => {
+                    self.current_written_buffer.pop();
+                }
+                KeyValue::Enter => self.enter_new_line = true,
+                KeyValue::Left => todo!(),
+                KeyValue::Right => todo!(),
+                KeyValue::Up => todo!(),
+                KeyValue::Down => todo!(),
+                KeyValue::Home => todo!(),
+                KeyValue::End => todo!(),
+                KeyValue::PageUp => todo!(),
+                KeyValue::PageDown => todo!(),
+                KeyValue::Tab => todo!(),
+                KeyValue::BackTab => todo!(),
+                KeyValue::Delete => todo!(),
+                KeyValue::Insert => todo!(),
+                KeyValue::F(_) => todo!(),
+                KeyValue::Char(ch) => self.current_input.push(*ch),
+                KeyValue::Null => todo!(),
+                KeyValue::Esc => todo!(),
+                KeyValue::CapsLock => todo!(),
+                KeyValue::ScrollLock => todo!(),
+                KeyValue::NumLock => todo!(),
+                KeyValue::PrintScreen => todo!(),
+                KeyValue::Pause => todo!(),
+                KeyValue::Menu => todo!(),
+                KeyValue::KeypadBegin => todo!(),
             }
         } else {
             info!("User wrote: '{}'", input.to_string_repr());