Introduce themes

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lumberjack"
-version = "0.2.4"
+version = "0.3.0"
 edition = "2024"
 
 [dependencies]

README.md

@@ -40,6 +40,11 @@ Built in **Rust**, powered by **ratatui**, **crossterm**, and the **AWS SDK for
   - `1/2/3/4` for time presets
   - `t` to tail
   - `y` to copy all results
+  - `T` to cycle color themes (Dark → Light → Green CRT)
+- 🎨 Theme support
+  - Dark (default)
+  - Light
+  - Retro Green CRT (phosphor-style, neon green on black)
 - 🌑 Focus-aware panes (Groups / Filter / Results) with clear borders and styles
 
 ---
@@ -79,6 +84,7 @@ cargo run -- --profile=<aws-profile> --region=<aws-region>
 - `s` – Save current filter (opens name popup; persists to `~/.config/lumberjack/filters.json`)
 - `F` – Load saved filter (opens popup with saved filter names)
 - `t` – Toggle tail/stream mode for results
+- `T` – Cycle color themes (Dark → Light → Green CRT)
 - `Esc` – Cancel editing, group search, or close popups
 - `y` – Copy all Results to clipboard (when Results pane is focused)
 - `q` – Quit (except while editing or in group search)

src/app/clipboard.rs

@@ -1,8 +1,6 @@
-use std::time::Instant;
-
-use arboard::Clipboard;
-
 use crate::app::App;
+use arboard::Clipboard;
+use std::time::Instant;
 
 impl App {
     pub fn results_text(&self) -> String {
@@ -28,6 +26,7 @@ impl App {
 #[cfg(test)]
 mod tests {
     use crate::app::{App, FilterField, Focus};
+    use crate::ui::styles::Theme;
     use std::sync::mpsc;
     use std::time::Instant as StdInstant;
 
@@ -36,6 +35,8 @@ mod tests {
 
         App {
             app_title: "Test".to_string(),
+            theme: Theme::default_dark(),
+            theme_name: "dark".to_string(),
             exit: false,
             lines: lines.into_iter().map(|s| s.to_string()).collect(),
             filter_cursor_pos: 0,

src/app/filters.rs

@@ -187,6 +187,7 @@ impl App {
 mod tests {
     use super::*;
     use crate::app::{App, Focus};
+    use crate::ui::styles::Theme;
     use std::sync::mpsc;
     use std::time::Instant as StdInstant;
 
@@ -195,6 +196,8 @@ mod tests {
 
         App {
             app_title: "Test".to_string(),
+            theme: Theme::default_dark(),
+            theme_name: "dark".to_string(),
             exit: false,
             lines: Vec::new(),
             filter_cursor_pos: 0,

src/app/keymap.rs

@@ -1,4 +1,5 @@
 use super::{App, FilterField, Focus};
+use crate::ui::styles::Theme;
 use ratatui::crossterm::event::{KeyCode, KeyEventKind};
 use std::io;
 
@@ -192,6 +193,19 @@ impl App {
                 self.apply_time_preset("-24m");
             }
 
+            KeyCode::Char('T') if !self.editing => {
+                if self.theme_name == "dark" {
+                    self.theme = Theme::light();
+                    self.theme_name = "light".to_string();
+                } else if self.theme_name == "light" {
+                    self.theme = Theme::green();
+                    self.theme_name = "green".to_string();
+                } else {
+                    self.theme = Theme::default_dark();
+                    self.theme_name = "dark".to_string();
+                }
+            }
+
             _ => {}
         }
 
@@ -202,6 +216,7 @@ impl App {
 #[cfg(test)]
 mod tests {
     use crate::app::{App, FilterField, Focus};
+    use crate::ui::styles::Theme;
     use ratatui::crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
     use std::sync::mpsc;
     use std::time::Instant as StdInstant;
@@ -215,6 +230,8 @@ mod tests {
 
         App {
             app_title: "Test".to_string(),
+            theme: Theme::default_dark(),
+            theme_name: "dark".to_string(),
             exit: false,
             lines: Vec::new(),
             filter_cursor_pos: 0,
@@ -284,4 +301,23 @@ mod tests {
         assert_eq!(app.filter_query, "abc");
         assert_eq!(app.filter_cursor_pos, 2); // back between 'b' and 'c'
     }
+
+    #[test]
+    fn theme_cycles_dark_light_green_on_t() {
+        let mut app = app_with_filter_query("");
+        // Ensure starting theme is dark
+        assert_eq!(app.theme_name, "dark");
+
+        // First T: dark -> light
+        app.handle_key_event(key(KeyCode::Char('T'))).unwrap();
+        assert_eq!(app.theme_name, "light");
+
+        // Second T: light -> green
+        app.handle_key_event(key(KeyCode::Char('T'))).unwrap();
+        assert_eq!(app.theme_name, "green");
+
+        // Third T: green -> dark
+        app.handle_key_event(key(KeyCode::Char('T'))).unwrap();
+        assert_eq!(app.theme_name, "dark");
+    }
 }

src/app/mod.rs

@@ -7,6 +7,7 @@ use std::sync::atomic::Ordering;
 use std::sync::mpsc::{Receiver, Sender};
 use std::time::{Duration, Instant};
 
+use crate::ui::styles::Theme;
 use chrono::Utc;
 use ratatui::crossterm::event;
 use ratatui::prelude::Rect;
@@ -43,6 +44,8 @@ pub struct SavedFilter {
 
 pub struct App {
     pub app_title: String,
+    pub theme: Theme,
+    pub theme_name: String,
     pub exit: bool,
     pub lines: Vec<String>,
     pub filter_cursor_pos: usize,
@@ -493,6 +496,8 @@ mod tests {
 
         App {
             app_title: "Test".to_string(),
+            theme: Theme::default_dark(),
+            theme_name: "dark".to_string(),
             exit: false,
             lines: Vec::new(),
             filter_cursor_pos: 0,

src/main.rs

@@ -7,6 +7,7 @@ mod app;
 mod aws;
 mod ui;
 
+use crate::ui::styles::Theme;
 use app::{App, FilterField, Focus};
 use aws::fetch_log_groups;
 
@@ -35,6 +36,8 @@ fn main() -> io::Result<()> {
 
     let mut app = App {
         app_title: APP_TITLE.to_string(),
+        theme: Theme::default_dark(),
+        theme_name: "dark".to_string(),
         exit: false,
         lines: Vec::new(),
         filter_cursor_pos: 0,