1 files changed, 70 insertions, 0 deletions
diff --git a/src/frontend/handler.rs b/src/frontend/handler.rs
new file mode 100644
index 0000000..2cc8bb5
--- /dev/null
+++ b/src/frontend/handler.rs
@@ -0,0 +1,70 @@
+use crate::frontend::app::{App, AppResult};
+use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+
+use super::app::CurrentArea;
+
+/// Handles the key events and updates the state of [`App`].
+pub fn handle_key_events(key_event: KeyEvent, app: &mut App) -> AppResult<()> {
+    // Keycodes activated for every area (high priority)
+    match key_event.code {
+        // Exit application on `ESC` or `q`
+        KeyCode::Esc | KeyCode::Char('q') => {
+            app.quit();
+        }
+        // Exit application on `Ctrl-C`
+        KeyCode::Char('c') | KeyCode::Char('C') => {
+            if key_event.modifiers == KeyModifiers::CONTROL {
+                app.quit();
+            }
+        }
+        _ => {}
+    }
+    // Keycodes for specific areas
+    match app.current_area {
+        // Keycodes for the tag area
+        CurrentArea::TagArea => match key_event.code {
+            KeyCode::Char('j') | KeyCode::Down => {
+                app.select_next();
+            }
+            KeyCode::Char('k') | KeyCode::Up => {
+                app.select_previous();
+            }
+            KeyCode::Char('h') | KeyCode::Left => {
+                app.select_none();
+            }
+            KeyCode::Char('g') | KeyCode::Home => {
+                app.select_first();
+            }
+            KeyCode::Char('G') | KeyCode::End => {
+                app.select_last();
+            }
+            KeyCode::Tab | KeyCode::BackTab => {
+                app.toggle_area();
+            }
+            _ => {}
+        },
+        // Keycodes for the entry area
+        CurrentArea::EntryArea => match key_event.code {
+            KeyCode::Char('j') | KeyCode::Down => {
+                app.select_next();
+            }
+            KeyCode::Char('k') | KeyCode::Up => {
+                app.select_previous();
+            }
+            KeyCode::Char('h') | KeyCode::Left => {
+                app.select_none();
+            }
+            KeyCode::Char('g') | KeyCode::Home => {
+                app.select_first();
+            }
+            KeyCode::Char('G') | KeyCode::End => {
+                app.select_last();
+            }
+            KeyCode::Tab | KeyCode::BackTab => {
+                app.toggle_area();
+            }
+            _ => {}
+        },
+    }
+    Ok(())
+}