From e393c3f90a1459c2ec66bb1ee260afd2ff284530 Mon Sep 17 00:00:00 2001
From: rhysd <lin90162@yahoo.co.jp>
Date: Thu, 9 Jun 2022 00:01:37 +0900
Subject: [PATCH] implement conversion from crossterm event to textarea input

---
 examples/minimal.rs | 17 ++++-------------
 src/lib.rs          | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 48 insertions(+), 14 deletions(-)

diff --git a/examples/minimal.rs b/examples/minimal.rs
index f938a8b..a3a13b2 100644
--- a/examples/minimal.rs
+++ b/examples/minimal.rs
@@ -7,7 +7,7 @@ use tui::backend::CrosstermBackend;
 use tui::layout::{Constraint, Direction, Layout};
 use tui::widgets::{Block, Borders};
 use tui::Terminal;
-use tui_textarea::{Input, Key, TextArea};
+use tui_textarea::{Input, TextArea};
 
 fn main() -> io::Result<()> {
     let stdout = io::stdout();
@@ -29,20 +29,11 @@ fn main() -> io::Result<()> {
             let widget = textarea.widget();
             f.render_widget(widget, chunks[0]);
         })?;
-
         if let Event::Key(key) = crossterm::event::read()? {
-            match key.code {
-                KeyCode::Char(c) => textarea.input(Input {
-                    key: Key::Char(c),
-                    ctrl: false,
-                }),
-                KeyCode::Backspace => textarea.input(Input {
-                    key: Key::Backspace,
-                    ctrl: false,
-                }),
-                KeyCode::Esc => break,
-                _ => {}
+            if key.code == KeyCode::Esc {
+                break;
             }
+            textarea.input(Input::from(key));
         }
     }
 
diff --git a/src/lib.rs b/src/lib.rs
index da0306c..98a0123 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,6 +14,7 @@ pub enum Key {
     Delete,
     Home,
     End,
+    Null,
 }
 
 pub struct Input {
@@ -21,6 +22,47 @@ pub struct Input {
     pub ctrl: bool,
 }
 
+impl Default for Input {
+    fn default() -> Self {
+        Input {
+            key: Key::Null,
+            ctrl: false,
+        }
+    }
+}
+
+impl From<crossterm::event::Event> for Input {
+    fn from(event: crossterm::event::Event) -> Self {
+        if let crossterm::event::Event::Key(key) = event {
+            Self::from(key)
+        } else {
+            Self::default()
+        }
+    }
+}
+
+impl From<crossterm::event::KeyEvent> for Input {
+    fn from(key: crossterm::event::KeyEvent) -> Self {
+        use crossterm::event::{KeyCode, KeyModifiers};
+        let ctrl = key.modifiers.contains(KeyModifiers::CONTROL);
+        let key = match key.code {
+            KeyCode::Char(c) => Key::Char(c),
+            KeyCode::Backspace => Key::Backspace,
+            KeyCode::Enter => Key::Enter,
+            KeyCode::Left => Key::Left,
+            KeyCode::Right => Key::Right,
+            KeyCode::Up => Key::Up,
+            KeyCode::Down => Key::Down,
+            KeyCode::Tab => Key::Tab,
+            KeyCode::Delete => Key::Delete,
+            KeyCode::Home => Key::Home,
+            KeyCode::End => Key::End,
+            _ => Key::Null,
+        };
+        Self { key, ctrl }
+    }
+}
+
 pub struct TextArea<'a> {
     lines: Vec<String>,
     block: Option<Block<'a>>,
@@ -40,7 +82,8 @@ impl<'a> Default for TextArea<'a> {
 }
 
 impl<'a> TextArea<'a> {
-    pub fn input(&mut self, input: Input) {
+    pub fn input(&mut self, input: impl Into<Input>) {
+        let input = input.into();
         if input.ctrl {
             // TODO
         } else {