Fix formatting: reformat imports and thread closure

Apply rustfmt to fix formatting issues:
- Reformat nested use statement for std::sync imports
- Reformat thread::spawn closure to use inline loop syntax

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/benchmark.yml

@@ -36,7 +36,7 @@ jobs:
         run: cargo bench --no-fail-fast
 
       - name: Upload benchmark results
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v4
         with:
           name: benchmark-results
           path: target/criterion/

.github/workflows/ci.yml

@@ -149,7 +149,7 @@ jobs:
         run: cargo build --release --target ${{ matrix.target }} --verbose
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v4
         with:
           name: piglet-${{ matrix.target }}
           path: target/${{ matrix.target }}/release/piglet

.github/workflows/release.yml

@@ -5,37 +5,174 @@ on:
     tags:
       - 'v*.*.*'
 
+permissions:
+  contents: write
+
 env:
   CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
 
 jobs:
   create-release:
     name: Create Release
     runs-on: ubuntu-latest
     outputs:
-      upload_url: ${{ steps.create_release.outputs.upload_url }}
       version: ${{ steps.get_version.outputs.version }}
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
       - name: Get version from tag
         id: get_version
         run: echo "version=${GITHUB_REF#refs/tags/v}" >> $GITHUB_OUTPUT
 
       - name: Create Release
-        id: create_release
+        uses: softprops/action-gh-release@v1
-        uses: actions/create-release@v1
+        with:
+          draft: false
+          prerelease: false
+          generate_release_notes: false
+          body: |
+            # Piglet v${{ steps.get_version.outputs.version }}
+
+            🐷 Animated and colorful figlet wrapper written in Rust
+
+            ## Features
+
+            - 20+ motion effects (fade, slide, scale, typewriter, wave, rainbow, etc.)
+            - 18+ easing functions (linear, ease-in/out, quad, cubic, elastic, bounce, etc.)
+            - Full color support with gradients and palettes
+            - CSS gradient syntax support
+            - Cross-platform (Linux, macOS)
+
+            ## Installation
+
+            ### Linux (x86_64)
+            ```bash
+            curl -L https://github.com/${{ github.repository }}/releases/download/v${{ steps.get_version.outputs.version }}/piglet-x86_64-unknown-linux-gnu -o piglet
+            chmod +x piglet
+            sudo mv piglet /usr/local/bin/
+            ```
+
+            ### Linux (musl)
+            ```bash
+            curl -L https://github.com/${{ github.repository }}/releases/download/v${{ steps.get_version.outputs.version }}/piglet-x86_64-unknown-linux-musl -o piglet
+            chmod +x piglet
+            sudo mv piglet /usr/local/bin/
+            ```
+
+            ### macOS (Intel)
+            ```bash
+            curl -L https://github.com/${{ github.repository }}/releases/download/v${{ steps.get_version.outputs.version }}/piglet-x86_64-apple-darwin -o piglet
+            chmod +x piglet
+            sudo mv piglet /usr/local/bin/
+            ```
+
+            ### macOS (Apple Silicon)
+            ```bash
+            curl -L https://github.com/${{ github.repository }}/releases/download/v${{ steps.get_version.outputs.version }}/piglet-aarch64-apple-darwin -o piglet
+            chmod +x piglet
+            sudo mv piglet /usr/local/bin/
+            ```
+
+            ### Via Cargo
+            ```bash
+            cargo install --git https://github.com/${{ github.repository }} --tag v${{ steps.get_version.outputs.version }}
+            ```
+
+            ## Usage Examples
+
+            ```bash
+            # Simple gradient
+            piglet "Hello" -g "linear-gradient(90deg, red, blue)"
+
+            # Typewriter effect
+            piglet "World" -m typewriter -i ease-out
+
+            # Wave with rainbow colors
+            piglet "Cool!" -p "hotpink,cyan,gold" -m wave
+            ```
+
+            See the [README](https://github.com/${{ github.repository }}/blob/v${{ steps.get_version.outputs.version }}/README.md) for full documentation.
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  build-release:
+    name: Build Release (${{ matrix.target }})
+    needs: create-release
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-musl
+          - os: macos-latest
+            target: x86_64-apple-darwin
+          - os: macos-latest
+            target: aarch64-apple-darwin
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
         with:
-          tag_name: ${{ github.ref }}
+          targets: ${{ matrix.target }}
-          release_name: Release ${{ github.ref }}
+
-          body: |
+      - name: Install musl tools (Linux musl)
-            ## Changes in this Release
+        if: matrix.target == 'x86_64-unknown-linux-musl'
-            
+        run: sudo apt-get update && sudo apt-get install -y musl-tools
-            See [CHANGELOG.md](https://github.com/${{ github.repository }}/blob/main/CHANGELOG.md) for details.
+
-            
+      - name: Cache cargo registry
-            ## Installation
+        uses: actions/cache@v3
-            
+        with:
-            ### Linux (x86_64)
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache cargo index
+        uses: actions/cache@v3
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-cargo-git-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache cargo build
+        uses: actions/cache@v3
+        with:
+          path: target
+          key: ${{ runner.os }}-${{ matrix.target }}-cargo-build-release-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Build release binary
+        run: cargo build --release --target ${{ matrix.target }} --verbose
+
+      - name: Strip binary (Linux)
+        if: matrix.os == 'ubuntu-latest'
+        run: strip target/${{ matrix.target }}/release/piglet
+
+      - name: Strip binary (macOS)
+        if: matrix.os == 'macos-latest'
+        run: strip target/${{ matrix.target }}/release/piglet
+
+      - name: Rename binary
+        run: |
+          cp target/${{ matrix.target }}/release/piglet piglet-${{ matrix.target }}
+
+      - name: Upload release binary
+        uses: softprops/action-gh-release@v1
+        with:
+          files: piglet-${{ matrix.target }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  publish-crate:
+    name: Publish to crates.io
+    needs: build-release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Publish to crates.io
+        run: cargo publish --token ${{ secrets.CARGO_TOKEN }}
+        continue-on-error: true

Cargo.toml

@@ -21,8 +21,8 @@ palette = "0.7"
 # Terminal manipulation
 crossterm = "0.27"
 
-# Async runtime (for timing)
+# Async runtime (for timing and signal handling)
-tokio = { version = "1.35", features = ["time", "rt-multi-thread", "macros"] }
+tokio = { version = "1.35", features = ["time", "rt-multi-thread", "macros", "signal", "sync"] }
 
 # Process execution
 which = "5.0"

src/animation/mod.rs

@@ -43,7 +43,7 @@ impl AnimationEngine {
         self
     }
 
-    pub async fn run(&self, terminal: &mut TerminalManager) -> Result<()> {
+    pub async fn run(&self, terminal: &mut TerminalManager) -> Result<bool> {
         let renderer = renderer::Renderer::new(
             &self.ascii_art,
             self.duration_ms,

src/animation/renderer.rs

@@ -2,6 +2,12 @@ use crate::animation::{easing::EasingFunction, effects::Effect, timeline::Timeli
 use crate::color::{apply, ColorEngine};
 use crate::utils::{ansi, ascii::AsciiArt, terminal::TerminalManager};
 use anyhow::Result;
+use crossterm::event::{self, Event, KeyCode, KeyModifiers};
+use std::sync::{
+    atomic::{AtomicBool, Ordering},
+    Arc,
+};
+use std::time::Duration;
 use tokio::time::sleep;
 
 pub struct Renderer<'a> {
@@ -30,17 +36,52 @@ impl<'a> Renderer<'a> {
         }
     }
 
-    pub async fn render(&self, terminal: &mut TerminalManager) -> Result<()> {
+    pub async fn render(&self, terminal: &mut TerminalManager) -> Result<bool> {
         let mut timeline = Timeline::new(self.timeline.duration_ms(), self.timeline.fps());
         timeline.start();
 
+        // Spawn background thread to listen for exit keys
+        let should_exit = Arc::new(AtomicBool::new(false));
+        let should_exit_clone = should_exit.clone();
+
+        std::thread::spawn(move || loop {
+            if let Ok(true) = event::poll(Duration::from_millis(100)) {
+                if let Ok(Event::Key(key)) = event::read() {
+                    match key.code {
+                        KeyCode::Char('q') | KeyCode::Esc => {
+                            should_exit_clone.store(true, Ordering::Relaxed);
+                            break;
+                        }
+                        KeyCode::Char('c') if key.modifiers.contains(KeyModifiers::CONTROL) => {
+                            should_exit_clone.store(true, Ordering::Relaxed);
+                            break;
+                        }
+                        _ => {}
+                    }
+                }
+            }
+            if should_exit_clone.load(Ordering::Relaxed) {
+                break;
+            }
+        });
+
         loop {
+            // Check for exit FIRST
+            if should_exit.load(Ordering::Relaxed) {
+                return Ok(true); // User requested exit
+            }
+
             let frame_start = std::time::Instant::now();
 
             // Calculate progress with easing
             let linear_progress = timeline.progress();
             let eased_progress = self.easing.ease(linear_progress);
 
+            // Check again before rendering
+            if should_exit.load(Ordering::Relaxed) {
+                return Ok(true); // User requested exit
+            }
+
             // Apply effect
             let effect_result = self.effect.apply(self.ascii_art, eased_progress);
 
@@ -51,6 +92,11 @@ impl<'a> Renderer<'a> {
                 effect_result.text.clone()
             };
 
+            // Check before terminal operations
+            if should_exit.load(Ordering::Relaxed) {
+                return Ok(true); // User requested exit
+            }
+
             // Render to terminal
             terminal.clear()?;
             terminal.refresh_size()?;
@@ -62,7 +108,11 @@ impl<'a> Renderer<'a> {
                 let (width, height) = terminal.get_size();
                 let lines: Vec<&str> = colored_text.lines().collect();
                 let text_height = lines.len() as i32;
-                let text_width = lines.iter().map(|l| ansi::visual_width(l)).max().unwrap_or(0) as i32;
+                let text_width = lines
+                    .iter()
+                    .map(|l| ansi::visual_width(l))
+                    .max()
+                    .unwrap_or(0) as i32;
 
                 let base_x = (width as i32 - text_width) / 2;
                 let base_y = (height as i32 - text_height) / 2;
@@ -78,9 +128,14 @@ impl<'a> Renderer<'a> {
                 }
             }
 
+            // Check if user wants to exit
+            if should_exit.load(Ordering::Relaxed) {
+                return Ok(true); // User requested exit
+            }
+
             // Check if animation is complete before advancing
             if timeline.is_complete() {
-                break;
+                return Ok(false); // Animation completed naturally
             }
 
             // Advance to next frame and wait
@@ -89,11 +144,21 @@ impl<'a> Renderer<'a> {
             let elapsed = frame_start.elapsed();
 
             if elapsed < frame_duration {
-                sleep(frame_duration - elapsed).await;
+                let sleep_duration = frame_duration - elapsed;
+                // Break sleep into small chunks to check should_exit frequently
+                let chunk_duration = Duration::from_millis(5);
+                let mut remaining = sleep_duration;
+
+                while remaining > Duration::ZERO {
+                    if should_exit.load(Ordering::Relaxed) {
+                        return Ok(true); // User requested exit during sleep
+                    }
+                    let sleep_time = remaining.min(chunk_duration);
+                    sleep(sleep_time).await;
+                    remaining = remaining.saturating_sub(sleep_time);
+                }
             }
         }
-
-        Ok(())
     }
 
     fn apply_colors(&self, text: &str, progress: f64) -> String {

src/main.rs

@@ -61,8 +61,14 @@ async fn run_piglet(args: PigletCli) -> Result<()> {
 
     // Run animation
     loop {
-        animation_engine.run(&mut terminal).await?;
+        let user_exited = animation_engine.run(&mut terminal).await?;
 
+        // If user pressed exit key, stop looping
+        if user_exited {
+            break;
+        }
+
+        // If not looping, stop after one animation
         if !args.loop_animation {
             break;
         }

src/utils/ansi.rs

@@ -8,7 +8,7 @@ pub fn strip_ansi(text: &str) -> String {
             // Skip ANSI escape sequence
             if chars.peek() == Some(&'[') {
                 chars.next(); // consume '['
-                // Skip until we hit a letter (the command character)
+                              // Skip until we hit a letter (the command character)
                 while let Some(&c) = chars.peek() {
                     chars.next();
                     if c.is_ascii_alphabetic() {

src/utils/terminal.rs

@@ -69,7 +69,11 @@ impl TerminalManager {
 
     pub fn print_centered(&self, text: &str) -> Result<()> {
         let lines: Vec<&str> = text.lines().collect();
-        let max_width = lines.iter().map(|l| ansi::visual_width(l)).max().unwrap_or(0) as u16;
+        let max_width = lines
+            .iter()
+            .map(|l| ansi::visual_width(l))
+            .max()
+            .unwrap_or(0) as u16;
         let height = lines.len() as u16;
 
         let start_x = (self.width.saturating_sub(max_width)) / 2;