Complete piglet implementation with animations and effects

- Implement complete animation system with 20+ motion effects
- Add 18+ easing functions (quad, cubic, elastic, back, bounce)
- Implement color system with palette and gradient support
- Add parser for durations, colors, and CSS gradients
- Create comprehensive test suite (14 tests passing)
- Add linting and formatting with clippy/rustfmt
- Support for figlet integration with custom fonts
- Terminal rendering with crossterm
- Fix all clippy warnings and lint issues

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

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

.gitignore

@@ -0,0 +1,9 @@
+/target/
+**/*.rs.bk
+Cargo.lock
+.DS_Store
+*.swp
+*.swo
+*~
+.vscode/
+.idea/

Cargo.toml

@@ -16,13 +16,13 @@ csscolorparser = "0.6"
 palette = "0.7"
 
 # Animation & Interpolation
-scirs2-interpolate = "0.1"
+# scirs2-interpolate = "0.1.0-rc.2"  # Not needed, using custom easing functions
 
 # Terminal manipulation
 crossterm = "0.27"
 
 # Async runtime (for timing)
-tokio = { version = "1.35", features = ["time", "rt"] }
+tokio = { version = "1.35", features = ["time", "rt-multi-thread", "macros"] }
 
 # Process execution
 which = "5.0"

src/animation/easing.rs

@@ -1,49 +1,318 @@
-use anyhow::{Result, bail};
-use scirs2_interpolate::*;
+use anyhow::{bail, Result};
 
 pub trait EasingFunction: Send + Sync {
     fn ease(&self, t: f64) -> f64;
+    #[allow(dead_code)]
     fn name(&self) -> &str;
 }
 
 // Linear
 pub struct Linear;
 impl EasingFunction for Linear {
-    fn ease(&self, t: f64) -> f64 { t }
-    fn name(&self) -> &str { "linear" }
+    fn ease(&self, t: f64) -> f64 {
+        t
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "linear"
+    }
+}
+
+// Basic easing
+pub struct EaseIn;
+impl EasingFunction for EaseIn {
+    fn ease(&self, t: f64) -> f64 {
+        t * t
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in"
+    }
+}
+
+pub struct EaseOut;
+impl EasingFunction for EaseOut {
+    fn ease(&self, t: f64) -> f64 {
+        t * (2.0 - t)
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-out"
+    }
+}
+
+pub struct EaseInOut;
+impl EasingFunction for EaseInOut {
+    fn ease(&self, t: f64) -> f64 {
+        if t < 0.5 {
+            2.0 * t * t
+        } else {
+            -1.0 + (4.0 - 2.0 * t) * t
+        }
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-out"
+    }
 }
 
 // Quadratic
 pub struct EaseInQuad;
 impl EasingFunction for EaseInQuad {
-    fn ease(&self, t: f64) -> f64 { quad_ease_in(t, 0.0, 1.0, 1.0) }
-    fn name(&self) -> &str { "ease-in-quad" }
+    fn ease(&self, t: f64) -> f64 {
+        t * t
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-quad"
+    }
 }
 
 pub struct EaseOutQuad;
 impl EasingFunction for EaseOutQuad {
-    fn ease(&self, t: f64) -> f64 { quad_ease_out(t, 0.0, 1.0, 1.0) }
-    fn name(&self) -> &str { "ease-out-quad" }
+    fn ease(&self, t: f64) -> f64 {
+        t * (2.0 - t)
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-out-quad"
+    }
 }
 
 pub struct EaseInOutQuad;
 impl EasingFunction for EaseInOutQuad {
-    fn ease(&self, t: f64) -> f64 { quad_ease_in_out(t, 0.0, 1.0, 1.0) }
-    fn name(&self) -> &str { "ease-in-out-quad" }
+    fn ease(&self, t: f64) -> f64 {
+        if t < 0.5 {
+            2.0 * t * t
+        } else {
+            -1.0 + (4.0 - 2.0 * t) * t
+        }
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-out-quad"
+    }
 }
 
 // Cubic
 pub struct EaseInCubic;
 impl EasingFunction for EaseInCubic {
-    fn ease(&self, t: f64) -> f64 { cubic_ease_in(t, 0.0, 1.0, 1.0) }
-    fn name(&self) -> &str { "ease-in-cubic" }
+    fn ease(&self, t: f64) -> f64 {
+        t * t * t
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-cubic"
+    }
 }
 
 pub struct EaseOutCubic;
 impl EasingFunction for EaseOutCubic {
-    fn ease(&self, t: f64) -> f64 { cubic_ease_out(t, 0.0, 1.0, 1.0) }
-    fn name(&self) -> &str { "ease-out-cubic" }
+    fn ease(&self, t: f64) -> f64 {
+        let t1 = t - 1.0;
+        t1 * t1 * t1 + 1.0
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-out-cubic"
+    }
 }
 
 pub struct EaseInOutCubic;
-impl EasingFunction for EaseInOut
+impl EasingFunction for EaseInOutCubic {
+    fn ease(&self, t: f64) -> f64 {
+        if t < 0.5 {
+            4.0 * t * t * t
+        } else {
+            1.0 - (-2.0 * t + 2.0).powi(3) / 2.0
+        }
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-out-cubic"
+    }
+}
+
+// Back
+pub struct EaseInBack;
+impl EasingFunction for EaseInBack {
+    fn ease(&self, t: f64) -> f64 {
+        let c1 = 1.70158;
+        let c3 = c1 + 1.0;
+        c3 * t * t * t - c1 * t * t
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-back"
+    }
+}
+
+pub struct EaseOutBack;
+impl EasingFunction for EaseOutBack {
+    fn ease(&self, t: f64) -> f64 {
+        let c1 = 1.70158;
+        let c3 = c1 + 1.0;
+        1.0 + c3 * (t - 1.0).powi(3) + c1 * (t - 1.0).powi(2)
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-out-back"
+    }
+}
+
+pub struct EaseInOutBack;
+impl EasingFunction for EaseInOutBack {
+    fn ease(&self, t: f64) -> f64 {
+        let c1 = 1.70158;
+        let c2 = c1 * 1.525;
+        if t < 0.5 {
+            ((2.0 * t).powi(2) * ((c2 + 1.0) * 2.0 * t - c2)) / 2.0
+        } else {
+            ((2.0 * t - 2.0).powi(2) * ((c2 + 1.0) * (t * 2.0 - 2.0) + c2) + 2.0) / 2.0
+        }
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-out-back"
+    }
+}
+
+// Elastic
+pub struct EaseInElastic;
+impl EasingFunction for EaseInElastic {
+    fn ease(&self, t: f64) -> f64 {
+        if t == 0.0 {
+            return 0.0;
+        }
+        if t == 1.0 {
+            return 1.0;
+        }
+        let c4 = (2.0 * std::f64::consts::PI) / 3.0;
+        -(2.0_f64.powf(10.0 * t - 10.0)) * ((t * 10.0 - 10.75) * c4).sin()
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-elastic"
+    }
+}
+
+pub struct EaseOutElastic;
+impl EasingFunction for EaseOutElastic {
+    fn ease(&self, t: f64) -> f64 {
+        if t == 0.0 {
+            return 0.0;
+        }
+        if t == 1.0 {
+            return 1.0;
+        }
+        let c4 = (2.0 * std::f64::consts::PI) / 3.0;
+        2.0_f64.powf(-10.0 * t) * ((t * 10.0 - 0.75) * c4).sin() + 1.0
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-out-elastic"
+    }
+}
+
+pub struct EaseInOutElastic;
+impl EasingFunction for EaseInOutElastic {
+    fn ease(&self, t: f64) -> f64 {
+        if t == 0.0 {
+            return 0.0;
+        }
+        if t == 1.0 {
+            return 1.0;
+        }
+        let c5 = (2.0 * std::f64::consts::PI) / 4.5;
+        if t < 0.5 {
+            -(2.0_f64.powf(20.0 * t - 10.0) * ((20.0 * t - 11.125) * c5).sin()) / 2.0
+        } else {
+            (2.0_f64.powf(-20.0 * t + 10.0) * ((20.0 * t - 11.125) * c5).sin()) / 2.0 + 1.0
+        }
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-out-elastic"
+    }
+}
+
+// Bounce
+fn bounce_out(t: f64) -> f64 {
+    let n1 = 7.5625;
+    let d1 = 2.75;
+
+    if t < 1.0 / d1 {
+        n1 * t * t
+    } else if t < 2.0 / d1 {
+        let t = t - 1.5 / d1;
+        n1 * t * t + 0.75
+    } else if t < 2.5 / d1 {
+        let t = t - 2.25 / d1;
+        n1 * t * t + 0.9375
+    } else {
+        let t = t - 2.625 / d1;
+        n1 * t * t + 0.984375
+    }
+}
+
+pub struct EaseInBounce;
+impl EasingFunction for EaseInBounce {
+    fn ease(&self, t: f64) -> f64 {
+        1.0 - bounce_out(1.0 - t)
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-bounce"
+    }
+}
+
+pub struct EaseOutBounce;
+impl EasingFunction for EaseOutBounce {
+    fn ease(&self, t: f64) -> f64 {
+        bounce_out(t)
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-out-bounce"
+    }
+}
+
+pub struct EaseInOutBounce;
+impl EasingFunction for EaseInOutBounce {
+    fn ease(&self, t: f64) -> f64 {
+        if t < 0.5 {
+            (1.0 - bounce_out(1.0 - 2.0 * t)) / 2.0
+        } else {
+            (1.0 + bounce_out(2.0 * t - 1.0)) / 2.0
+        }
+    }
+    #[allow(dead_code)]
+    fn name(&self) -> &str {
+        "ease-in-out-bounce"
+    }
+}
+
+pub fn get_easing_function(name: &str) -> Result<Box<dyn EasingFunction>> {
+    match name {
+        "linear" => Ok(Box::new(Linear)),
+        "ease-in" => Ok(Box::new(EaseIn)),
+        "ease-out" => Ok(Box::new(EaseOut)),
+        "ease-in-out" => Ok(Box::new(EaseInOut)),
+        "ease-in-quad" => Ok(Box::new(EaseInQuad)),
+        "ease-out-quad" => Ok(Box::new(EaseOutQuad)),
+        "ease-in-out-quad" => Ok(Box::new(EaseInOutQuad)),
+        "ease-in-cubic" => Ok(Box::new(EaseInCubic)),
+        "ease-out-cubic" => Ok(Box::new(EaseOutCubic)),
+        "ease-in-out-cubic" => Ok(Box::new(EaseInOutCubic)),
+        "ease-in-back" => Ok(Box::new(EaseInBack)),
+        "ease-out-back" => Ok(Box::new(EaseOutBack)),
+        "ease-in-out-back" => Ok(Box::new(EaseInOutBack)),
+        "ease-in-elastic" => Ok(Box::new(EaseInElastic)),
+        "ease-out-elastic" => Ok(Box::new(EaseOutElastic)),
+        "ease-in-out-elastic" => Ok(Box::new(EaseInOutElastic)),
+        "ease-in-bounce" => Ok(Box::new(EaseInBounce)),
+        "ease-out-bounce" => Ok(Box::new(EaseOutBounce)),
+        "ease-in-out-bounce" => Ok(Box::new(EaseInOutBounce)),
+        _ => bail!("Unknown easing function: {}", name),
+    }
+}

src/animation/effects.rs

@@ -0,0 +1,450 @@
+use crate::utils::ascii::AsciiArt;
+use anyhow::{bail, Result};
+
+pub trait Effect: Send + Sync {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult;
+    fn name(&self) -> &str;
+}
+
+#[derive(Debug, Clone)]
+pub struct EffectResult {
+    pub text: String,
+    pub opacity: f64,
+    pub offset_x: i32,
+    pub offset_y: i32,
+    pub scale: f64,
+}
+
+impl EffectResult {
+    pub fn new(text: String) -> Self {
+        Self {
+            text,
+            opacity: 1.0,
+            offset_x: 0,
+            offset_y: 0,
+            scale: 1.0,
+        }
+    }
+
+    pub fn with_opacity(mut self, opacity: f64) -> Self {
+        self.opacity = opacity;
+        self
+    }
+
+    pub fn with_offset(mut self, x: i32, y: i32) -> Self {
+        self.offset_x = x;
+        self.offset_y = y;
+        self
+    }
+
+    pub fn with_scale(mut self, scale: f64) -> Self {
+        self.scale = scale;
+        self
+    }
+}
+
+// Fade effects
+pub struct FadeIn;
+impl Effect for FadeIn {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let text = ascii_art.apply_fade(progress);
+        EffectResult::new(text).with_opacity(progress)
+    }
+
+    fn name(&self) -> &str {
+        "fade-in"
+    }
+}
+
+pub struct FadeOut;
+impl Effect for FadeOut {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let opacity = 1.0 - progress;
+        let text = ascii_art.apply_fade(opacity);
+        EffectResult::new(text).with_opacity(opacity)
+    }
+
+    fn name(&self) -> &str {
+        "fade-out"
+    }
+}
+
+pub struct FadeInOut;
+impl Effect for FadeInOut {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let opacity = if progress < 0.5 {
+            progress * 2.0
+        } else {
+            (1.0 - progress) * 2.0
+        };
+        let text = ascii_art.apply_fade(opacity);
+        EffectResult::new(text).with_opacity(opacity)
+    }
+
+    fn name(&self) -> &str {
+        "fade-in-out"
+    }
+}
+
+// Slide effects
+pub struct SlideInTop;
+impl Effect for SlideInTop {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let offset_y = ((1.0 - progress) * -(ascii_art.height() as f64)) as i32;
+        EffectResult::new(ascii_art.render()).with_offset(0, offset_y)
+    }
+
+    fn name(&self) -> &str {
+        "slide-in-top"
+    }
+}
+
+pub struct SlideInBottom;
+impl Effect for SlideInBottom {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let offset_y = ((1.0 - progress) * ascii_art.height() as f64) as i32;
+        EffectResult::new(ascii_art.render()).with_offset(0, offset_y)
+    }
+
+    fn name(&self) -> &str {
+        "slide-in-bottom"
+    }
+}
+
+pub struct SlideInLeft;
+impl Effect for SlideInLeft {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let offset_x = ((1.0 - progress) * -(ascii_art.width() as f64)) as i32;
+        EffectResult::new(ascii_art.render()).with_offset(offset_x, 0)
+    }
+
+    fn name(&self) -> &str {
+        "slide-in-left"
+    }
+}
+
+pub struct SlideInRight;
+impl Effect for SlideInRight {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let offset_x = ((1.0 - progress) * ascii_art.width() as f64) as i32;
+        EffectResult::new(ascii_art.render()).with_offset(offset_x, 0)
+    }
+
+    fn name(&self) -> &str {
+        "slide-in-right"
+    }
+}
+
+// Scale effects
+pub struct ScaleUp;
+impl Effect for ScaleUp {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let scale = progress;
+        let scaled = ascii_art.scale(scale);
+        EffectResult::new(scaled.render()).with_scale(scale)
+    }
+
+    fn name(&self) -> &str {
+        "scale-up"
+    }
+}
+
+pub struct ScaleDown;
+impl Effect for ScaleDown {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let scale = 2.0 - progress;
+        let scaled = ascii_art.scale(scale);
+        EffectResult::new(scaled.render()).with_scale(scale)
+    }
+
+    fn name(&self) -> &str {
+        "scale-down"
+    }
+}
+
+// Pulse effect
+pub struct Pulse;
+impl Effect for Pulse {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let scale = 1.0 + (progress * std::f64::consts::PI * 2.0).sin() * 0.1;
+        let scaled = ascii_art.scale(scale);
+        EffectResult::new(scaled.render()).with_scale(scale)
+    }
+
+    fn name(&self) -> &str {
+        "pulse"
+    }
+}
+
+// Bounce effects
+pub struct BounceIn;
+impl Effect for BounceIn {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let offset_y = if progress < 0.8 {
+            ((1.0 - progress / 0.8) * -(ascii_art.height() as f64)) as i32
+        } else {
+            let bounce_progress = (progress - 0.8) / 0.2;
+            (bounce_progress * 10.0 * (1.0 - bounce_progress)) as i32
+        };
+        EffectResult::new(ascii_art.render()).with_offset(0, offset_y)
+    }
+
+    fn name(&self) -> &str {
+        "bounce-in"
+    }
+}
+
+pub struct BounceOut;
+impl Effect for BounceOut {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let offset_y = if progress < 0.2 {
+            -(progress * 10.0 * (1.0 - progress / 0.2)) as i32
+        } else {
+            (((progress - 0.2) / 0.8) * ascii_art.height() as f64) as i32
+        };
+        EffectResult::new(ascii_art.render()).with_offset(0, offset_y)
+    }
+
+    fn name(&self) -> &str {
+        "bounce-out"
+    }
+}
+
+// Typewriter effect
+pub struct Typewriter;
+impl Effect for Typewriter {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let total_chars = ascii_art.char_count();
+        let visible_chars = (total_chars as f64 * progress) as usize;
+
+        let positions = ascii_art.char_positions();
+        let lines = ascii_art.get_lines();
+        let mut result_lines: Vec<String> = lines
+            .iter()
+            .map(|l| {
+                l.chars()
+                    .map(|c| if c.is_whitespace() { c } else { ' ' })
+                    .collect()
+            })
+            .collect();
+
+        for (i, (x, y, ch)) in positions.iter().enumerate() {
+            if i < visible_chars {
+                if let Some(line) = result_lines.get_mut(*y) {
+                    let mut chars: Vec<char> = line.chars().collect();
+                    if *x < chars.len() {
+                        chars[*x] = *ch;
+                        *line = chars.iter().collect();
+                    }
+                }
+            }
+        }
+
+        EffectResult::new(result_lines.join("\n"))
+    }
+
+    fn name(&self) -> &str {
+        "typewriter"
+    }
+}
+
+pub struct TypewriterReverse;
+impl Effect for TypewriterReverse {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let total_chars = ascii_art.char_count();
+        let visible_chars = (total_chars as f64 * (1.0 - progress)) as usize;
+
+        let positions = ascii_art.char_positions();
+        let lines = ascii_art.get_lines();
+        let mut result_lines: Vec<String> = lines
+            .iter()
+            .map(|l| {
+                l.chars()
+                    .map(|c| if c.is_whitespace() { c } else { ' ' })
+                    .collect()
+            })
+            .collect();
+
+        for (i, (x, y, ch)) in positions.iter().enumerate() {
+            if i < visible_chars {
+                if let Some(line) = result_lines.get_mut(*y) {
+                    let mut chars: Vec<char> = line.chars().collect();
+                    if *x < chars.len() {
+                        chars[*x] = *ch;
+                        *line = chars.iter().collect();
+                    }
+                }
+            }
+        }
+
+        EffectResult::new(result_lines.join("\n"))
+    }
+
+    fn name(&self) -> &str {
+        "typewriter-reverse"
+    }
+}
+
+// Wave effect
+pub struct Wave;
+impl Effect for Wave {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let lines: Vec<String> = ascii_art
+            .get_lines()
+            .iter()
+            .enumerate()
+            .map(|(i, line)| {
+                let wave_offset =
+                    ((progress * std::f64::consts::PI * 2.0 + i as f64 * 0.5).sin() * 3.0) as usize;
+                format!("{}{}", " ".repeat(wave_offset), line)
+            })
+            .collect();
+
+        EffectResult::new(lines.join("\n"))
+    }
+
+    fn name(&self) -> &str {
+        "wave"
+    }
+}
+
+// Jello effect
+pub struct Jello;
+impl Effect for Jello {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let wobble = (progress * std::f64::consts::PI * 4.0).sin() * (1.0 - progress);
+        let scale = 1.0 + wobble * 0.1;
+        let scaled = ascii_art.scale(scale.abs());
+        EffectResult::new(scaled.render()).with_scale(scale.abs())
+    }
+
+    fn name(&self) -> &str {
+        "jello"
+    }
+}
+
+// Rotate effects
+pub struct RotateIn;
+impl Effect for RotateIn {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        // Simulate rotation with scale and offset
+        let angle = (1.0 - progress) * std::f64::consts::PI;
+        let scale = progress;
+        let scaled = ascii_art.scale(scale);
+        let offset_x = (angle.cos() * 10.0 * (1.0 - progress)) as i32;
+        EffectResult::new(scaled.render())
+            .with_scale(scale)
+            .with_offset(offset_x, 0)
+    }
+
+    fn name(&self) -> &str {
+        "rotate-in"
+    }
+}
+
+pub struct RotateOut;
+impl Effect for RotateOut {
+    fn apply(&self, ascii_art: &AsciiArt, progress: f64) -> EffectResult {
+        let angle = progress * std::f64::consts::PI;
+        let scale = 1.0 - progress;
+        let scaled = ascii_art.scale(scale);
+        let offset_x = (angle.cos() * 10.0 * progress) as i32;
+        EffectResult::new(scaled.render())
+            .with_scale(scale)
+            .with_offset(offset_x, 0)
+    }
+
+    fn name(&self) -> &str {
+        "rotate-out"
+    }
+}
+
+// Color effects (these will be enhanced by color engine)
+pub struct ColorCycle;
+impl Effect for ColorCycle {
+    fn apply(&self, ascii_art: &AsciiArt, _progress: f64) -> EffectResult {
+        EffectResult::new(ascii_art.render())
+    }
+
+    fn name(&self) -> &str {
+        "color-cycle"
+    }
+}
+
+pub struct Rainbow;
+impl Effect for Rainbow {
+    fn apply(&self, ascii_art: &AsciiArt, _progress: f64) -> EffectResult {
+        EffectResult::new(ascii_art.render())
+    }
+
+    fn name(&self) -> &str {
+        "rainbow"
+    }
+}
+
+pub struct GradientFlow;
+impl Effect for GradientFlow {
+    fn apply(&self, ascii_art: &AsciiArt, _progress: f64) -> EffectResult {
+        EffectResult::new(ascii_art.render())
+    }
+
+    fn name(&self) -> &str {
+        "gradient-flow"
+    }
+}
+
+/// Get effect by name
+pub fn get_effect(name: &str) -> Result<Box<dyn Effect>> {
+    match name {
+        "fade-in" => Ok(Box::new(FadeIn)),
+        "fade-out" => Ok(Box::new(FadeOut)),
+        "fade-in-out" => Ok(Box::new(FadeInOut)),
+        "slide-in-top" => Ok(Box::new(SlideInTop)),
+        "slide-in-bottom" => Ok(Box::new(SlideInBottom)),
+        "slide-in-left" => Ok(Box::new(SlideInLeft)),
+        "slide-in-right" => Ok(Box::new(SlideInRight)),
+        "scale-up" => Ok(Box::new(ScaleUp)),
+        "scale-down" => Ok(Box::new(ScaleDown)),
+        "pulse" => Ok(Box::new(Pulse)),
+        "bounce-in" => Ok(Box::new(BounceIn)),
+        "bounce-out" => Ok(Box::new(BounceOut)),
+        "typewriter" => Ok(Box::new(Typewriter)),
+        "typewriter-reverse" => Ok(Box::new(TypewriterReverse)),
+        "wave" => Ok(Box::new(Wave)),
+        "jello" => Ok(Box::new(Jello)),
+        "color-cycle" => Ok(Box::new(ColorCycle)),
+        "rainbow" => Ok(Box::new(Rainbow)),
+        "gradient-flow" => Ok(Box::new(GradientFlow)),
+        "rotate-in" => Ok(Box::new(RotateIn)),
+        "rotate-out" => Ok(Box::new(RotateOut)),
+        _ => bail!("Unknown effect: {}", name),
+    }
+}
+
+/// List all available effects
+#[allow(dead_code)]
+pub fn list_effects() -> Vec<&'static str> {
+    vec![
+        "fade-in",
+        "fade-out",
+        "fade-in-out",
+        "slide-in-top",
+        "slide-in-bottom",
+        "slide-in-left",
+        "slide-in-right",
+        "scale-up",
+        "scale-down",
+        "pulse",
+        "bounce-in",
+        "bounce-out",
+        "typewriter",
+        "typewriter-reverse",
+        "wave",
+        "jello",
+        "color-cycle",
+        "rainbow",
+        "gradient-flow",
+        "rotate-in",
+        "rotate-out",
+    ]
+}

src/animation/mod.rs

@@ -1,7 +1,7 @@
-pub mod effects;
 pub mod easing;
-pub mod timeline;
+pub mod effects;
 pub mod renderer;
+pub mod timeline;
 
 use crate::color::ColorEngine;
 use crate::utils::{ascii::AsciiArt, terminal::TerminalManager};
@@ -27,22 +27,22 @@ impl AnimationEngine {
             color_engine: ColorEngine::new(),
         }
     }
-    
+
     pub fn with_effect(mut self, effect_name: &str) -> Result<Self> {
         self.effect = effects::get_effect(effect_name)?;
         Ok(self)
     }
-    
+
     pub fn with_easing(mut self, easing_name: &str) -> Result<Self> {
         self.easing = easing::get_easing_function(easing_name)?;
         Ok(self)
     }
-    
+
     pub fn with_color_engine(mut self, color_engine: ColorEngine) -> Self {
         self.color_engine = color_engine;
         self
     }
-    
+
     pub async fn run(&self, terminal: &mut TerminalManager) -> Result<()> {
         let renderer = renderer::Renderer::new(
             &self.ascii_art,
@@ -52,7 +52,7 @@ impl AnimationEngine {
             &*self.easing,
             &self.color_engine,
         );
-        
+
         renderer.render(terminal).await
     }
-}
+}

src/animation/renderer.rs

@@ -0,0 +1,148 @@
+use crate::animation::{easing::EasingFunction, effects::Effect, timeline::Timeline};
+use crate::color::{apply, ColorEngine};
+use crate::utils::{ascii::AsciiArt, terminal::TerminalManager};
+use anyhow::Result;
+use tokio::time::sleep;
+
+pub struct Renderer<'a> {
+    ascii_art: &'a AsciiArt,
+    timeline: Timeline,
+    effect: &'a dyn Effect,
+    easing: &'a dyn EasingFunction,
+    color_engine: &'a ColorEngine,
+}
+
+impl<'a> Renderer<'a> {
+    pub fn new(
+        ascii_art: &'a AsciiArt,
+        duration_ms: u64,
+        fps: u32,
+        effect: &'a dyn Effect,
+        easing: &'a dyn EasingFunction,
+        color_engine: &'a ColorEngine,
+    ) -> Self {
+        Self {
+            ascii_art,
+            timeline: Timeline::new(duration_ms, fps),
+            effect,
+            easing,
+            color_engine,
+        }
+    }
+
+    pub async fn render(&self, terminal: &mut TerminalManager) -> Result<()> {
+        let mut timeline = Timeline::new(self.timeline.duration_ms(), self.timeline.fps());
+        timeline.start();
+
+        while !timeline.is_complete() {
+            let frame_start = std::time::Instant::now();
+
+            // Calculate progress with easing
+            let linear_progress = timeline.progress();
+            let eased_progress = self.easing.ease(linear_progress);
+
+            // Apply effect
+            let effect_result = self.effect.apply(self.ascii_art, eased_progress);
+
+            // Apply colors if available
+            let colored_text = if self.color_engine.has_colors() {
+                self.apply_colors(&effect_result.text, linear_progress)
+            } else {
+                effect_result.text.clone()
+            };
+
+            // Render to terminal
+            terminal.clear()?;
+            terminal.refresh_size()?;
+
+            // Apply offsets and render
+            if effect_result.offset_x == 0 && effect_result.offset_y == 0 {
+                terminal.print_centered(&colored_text)?;
+            } else {
+                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| l.len()).max().unwrap_or(0) as i32;
+
+                let base_x = (width as i32 - text_width) / 2;
+                let base_y = (height as i32 - text_height) / 2;
+
+                let x = (base_x + effect_result.offset_x).max(0) as u16;
+                let y = (base_y + effect_result.offset_y).max(0) as u16;
+
+                for (i, line) in lines.iter().enumerate() {
+                    let line_y = y.saturating_add(i as u16);
+                    if line_y < height {
+                        terminal.print_at(x, line_y, line)?;
+                    }
+                }
+            }
+
+            // Wait for next frame
+            timeline.next_frame();
+            let frame_duration = timeline.frame_duration();
+            let elapsed = frame_start.elapsed();
+
+            if elapsed < frame_duration {
+                sleep(frame_duration - elapsed).await;
+            }
+        }
+
+        Ok(())
+    }
+
+    fn apply_colors(&self, text: &str, progress: f64) -> String {
+        match self.effect.name() {
+            "rainbow" | "color-cycle" => {
+                // For rainbow/color-cycle effects, use gradient across characters
+                let char_count = text.chars().filter(|c| !c.is_whitespace()).count();
+                let colors = self.color_engine.get_colors(char_count);
+                apply::apply_gradient_to_text(text, &colors)
+            }
+            "gradient-flow" => {
+                // For gradient-flow, shift colors based on progress
+                let char_count = text.chars().filter(|c| !c.is_whitespace()).count();
+                let mut colors = self.color_engine.get_colors(char_count * 2);
+                let offset = (progress * colors.len() as f64) as usize;
+                let len = colors.len();
+                colors.rotate_left(offset % len);
+                colors.truncate(char_count);
+                apply::apply_gradient_to_text(text, &colors)
+            }
+            _ => {
+                // For other effects, use gradient based on progress
+                if let Some(color) = self.color_engine.color_at(progress) {
+                    let lines: Vec<String> = text
+                        .lines()
+                        .map(|line| apply::apply_color_to_line(line, &[color]))
+                        .collect();
+                    lines.join("\n")
+                } else {
+                    let char_count = text.chars().filter(|c| !c.is_whitespace()).count();
+                    let colors = self.color_engine.get_colors(char_count.max(10));
+                    apply::apply_gradient_to_text(text, &colors)
+                }
+            }
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::animation::easing::Linear;
+    use crate::animation::effects::FadeIn;
+
+    #[test]
+    fn test_renderer_creation() {
+        let ascii_art = AsciiArt::new("Test".to_string());
+        let effect = FadeIn;
+        let easing = Linear;
+        let color_engine = ColorEngine::new();
+
+        let renderer = Renderer::new(&ascii_art, 1000, 30, &effect, &easing, &color_engine);
+
+        assert_eq!(renderer.timeline.duration_ms(), 1000);
+        assert_eq!(renderer.timeline.fps(), 30);
+    }
+}

src/animation/timeline.rs

@@ -0,0 +1,123 @@
+use std::time::{Duration, Instant};
+
+pub struct Timeline {
+    duration_ms: u64,
+    fps: u32,
+    start_time: Option<Instant>,
+    current_frame: usize,
+    total_frames: usize,
+}
+
+impl Timeline {
+    pub fn new(duration_ms: u64, fps: u32) -> Self {
+        let total_frames = ((duration_ms as f64 / 1000.0) * fps as f64).ceil() as usize;
+
+        Self {
+            duration_ms,
+            fps,
+            start_time: None,
+            current_frame: 0,
+            total_frames,
+        }
+    }
+
+    pub fn start(&mut self) {
+        self.start_time = Some(Instant::now());
+        self.current_frame = 0;
+    }
+
+    #[allow(dead_code)]
+    pub fn reset(&mut self) {
+        self.start_time = None;
+        self.current_frame = 0;
+    }
+
+    pub fn is_complete(&self) -> bool {
+        self.current_frame >= self.total_frames
+    }
+
+    pub fn progress(&self) -> f64 {
+        if self.total_frames == 0 {
+            return 1.0;
+        }
+        (self.current_frame as f64 / self.total_frames as f64).min(1.0)
+    }
+
+    pub fn next_frame(&mut self) -> bool {
+        if self.is_complete() {
+            return false;
+        }
+
+        self.current_frame += 1;
+        true
+    }
+
+    pub fn frame_duration(&self) -> Duration {
+        Duration::from_millis(1000 / self.fps as u64)
+    }
+
+    #[allow(dead_code)]
+    pub fn elapsed(&self) -> Duration {
+        self.start_time
+            .map(|start| start.elapsed())
+            .unwrap_or(Duration::ZERO)
+    }
+
+    #[allow(dead_code)]
+    pub fn current_frame(&self) -> usize {
+        self.current_frame
+    }
+
+    #[allow(dead_code)]
+    pub fn total_frames(&self) -> usize {
+        self.total_frames
+    }
+
+    pub fn fps(&self) -> u32 {
+        self.fps
+    }
+
+    pub fn duration_ms(&self) -> u64 {
+        self.duration_ms
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_timeline_creation() {
+        let timeline = Timeline::new(1000, 30);
+        assert_eq!(timeline.total_frames(), 30);
+        assert_eq!(timeline.fps(), 30);
+    }
+
+    #[test]
+    fn test_timeline_progress() {
+        let mut timeline = Timeline::new(1000, 10);
+        timeline.start();
+
+        assert_eq!(timeline.progress(), 0.0);
+
+        for _ in 0..5 {
+            timeline.next_frame();
+        }
+
+        assert_eq!(timeline.progress(), 0.5);
+    }
+
+    #[test]
+    fn test_timeline_completion() {
+        let mut timeline = Timeline::new(1000, 10);
+        timeline.start();
+
+        assert!(!timeline.is_complete());
+
+        for _ in 0..10 {
+            timeline.next_frame();
+        }
+
+        assert!(timeline.is_complete());
+    }
+}

src/cli.rs

@@ -8,30 +8,30 @@ pub struct PigletCli {
     /// Text to render with figlet
     #[arg(value_name = "TEXT")]
     pub text: String,
-    
+
     /// Duration of animation (e.g., 3000ms, 0.3s, 0.5h, 5m)
     #[arg(short, long, default_value = "3s")]
     pub duration: String,
-    
+
     /// Color palette (hex or CSS4 colors, comma-separated)
     /// Example: "#FF5733,#33FF57,#3357FF" or "red,green,blue"
     #[arg(short = 'p', long, value_delimiter = ',')]
     pub color_palette: Option<Vec<String>>,
-    
+
     /// Color gradient (CSS4 gradient definition)
     /// Example: "linear-gradient(90deg, red, blue)"
     #[arg(short = 'g', long)]
     pub color_gradient: Option<String>,
-    
+
     /// Motion easing function
-    /// Options: linear, ease-in, ease-out, ease-in-out, ease-in-quad, 
+    /// Options: linear, ease-in, ease-out, ease-in-out, ease-in-quad,
     /// ease-out-quad, ease-in-out-quad, ease-in-cubic, ease-out-cubic,
     /// ease-in-out-cubic, ease-in-back, ease-out-back, ease-in-out-back,
     /// ease-in-elastic, ease-out-elastic, ease-in-out-elastic,
     /// ease-in-bounce, ease-out-bounce, ease-in-out-bounce
     #[arg(short = 'i', long, default_value = "ease-in-out")]
     pub motion_ease: String,
-    
+
     /// Motion effect name
     /// Options: fade-in, fade-out, fade-in-out, slide-in-top, slide-in-bottom,
     /// slide-in-left, slide-in-right, scale-up, scale-down, pulse,
@@ -39,33 +39,33 @@ pub struct PigletCli {
     /// jello, color-cycle, rainbow, gradient-flow, rotate-in, rotate-out
     #[arg(short, long, default_value = "fade-in")]
     pub motion_effect: String,
-    
+
     /// Figlet font
     #[arg(short = 'f', long)]
     pub font: Option<String>,
-    
+
     /// Additional figlet options (use after --)
     /// Example: piglet "Text" -- -w 200 -c
     #[arg(last = true)]
     pub figlet_args: Vec<String>,
-    
+
     /// Loop animation infinitely
     #[arg(short, long)]
     pub loop_animation: bool,
-    
+
     /// Frame rate (fps)
     #[arg(long, default_value = "30")]
     pub fps: u32,
-    
+
     /// List all available effects
     #[arg(long)]
     pub list_effects: bool,
-    
+
     /// List all available easing functions
     #[arg(long)]
     pub list_easing: bool,
-    
+
     /// List all available CSS4 colors
     #[arg(long)]
     pub list_colors: bool,
-}
+}

src/color/apply.rs

@@ -3,13 +3,13 @@ use crossterm::style::Color as CrosstermColor;
 
 pub fn apply_color_to_char(ch: char, color: Color) -> String {
     use crossterm::style::Stylize;
-    
+
     let crossterm_color = CrosstermColor::Rgb {
         r: color.r,
         g: color.g,
         b: color.b,
     };
-    
+
     format!("{}", ch.to_string().with(crossterm_color))
 }
 
@@ -17,7 +17,7 @@ pub fn apply_color_to_line(line: &str, colors: &[Color]) -> String {
     if colors.is_empty() {
         return line.to_string();
     }
-    
+
     line.chars()
         .enumerate()
         .map(|(i, ch)| {
@@ -34,14 +34,14 @@ pub fn apply_color_to_line(line: &str, colors: &[Color]) -> String {
 pub fn apply_gradient_to_text(text: &str, colors: &[Color]) -> String {
     let lines: Vec<&str> = text.lines().collect();
     let total_chars: usize = lines.iter().map(|l| l.chars().count()).sum();
-    
+
     if total_chars == 0 || colors.is_empty() {
         return text.to_string();
     }
-    
+
     let mut result = String::new();
     let mut char_index = 0;
-    
+
     for (line_idx, line) in lines.iter().enumerate() {
         for ch in line.chars() {
             if ch.is_whitespace() {
@@ -53,11 +53,11 @@ pub fn apply_gradient_to_text(text: &str, colors: &[Color]) -> String {
                 char_index += 1;
             }
         }
-        
+
         if line_idx < lines.len() - 1 {
             result.push('\n');
         }
     }
-    
+
     result
-}
+}

src/color/gradient.rs

@@ -1,7 +1,8 @@
-use crate::parser::gradient::Gradient;
 use crate::parser::color::Color;
+use crate::parser::gradient::Gradient;
 use anyhow::Result;
 
+#[derive(Debug, Clone)]
 pub struct GradientEngine {
     gradient: Gradient,
 }
@@ -10,17 +11,17 @@ impl GradientEngine {
     pub fn new(gradient: Gradient) -> Self {
         Self { gradient }
     }
-    
+
     pub fn from_string(gradient_str: &str) -> Result<Self> {
         let gradient = Gradient::parse(gradient_str)?;
         Ok(Self::new(gradient))
     }
-    
+
     pub fn color_at(&self, t: f64) -> Color {
         self.gradient.color_at(t)
     }
-    
+
     pub fn colors(&self, steps: usize) -> Vec<Color> {
         self.gradient.colors(steps)
     }
-}
+}

src/color/mod.rs

@@ -0,0 +1,83 @@
+pub mod apply;
+pub mod gradient;
+pub mod palette;
+
+use crate::parser::color::Color;
+use anyhow::Result;
+pub use gradient::GradientEngine;
+pub use palette::ColorPalette;
+
+#[derive(Debug, Clone)]
+pub enum ColorMode {
+    None,
+    Palette(ColorPalette),
+    Gradient(GradientEngine),
+}
+
+pub struct ColorEngine {
+    mode: ColorMode,
+}
+
+impl ColorEngine {
+    pub fn new() -> Self {
+        Self {
+            mode: ColorMode::None,
+        }
+    }
+
+    pub fn with_palette(mut self, palette: Option<&[String]>) -> Result<Self> {
+        if let Some(colors) = palette {
+            if !colors.is_empty() {
+                let palette = ColorPalette::from_strings(colors)?;
+                self.mode = ColorMode::Palette(palette);
+            }
+        }
+        Ok(self)
+    }
+
+    pub fn with_gradient(mut self, gradient: Option<&str>) -> Result<Self> {
+        if let Some(gradient_str) = gradient {
+            let gradient = GradientEngine::from_string(gradient_str)?;
+            self.mode = ColorMode::Gradient(gradient);
+        }
+        Ok(self)
+    }
+
+    pub fn has_colors(&self) -> bool {
+        !matches!(self.mode, ColorMode::None)
+    }
+
+    #[allow(dead_code)]
+    pub fn get_color(&self, t: f64, index: usize) -> Option<Color> {
+        match &self.mode {
+            ColorMode::None => None,
+            ColorMode::Palette(palette) => Some(palette.get_color(index)),
+            ColorMode::Gradient(gradient) => Some(gradient.color_at(t)),
+        }
+    }
+
+    #[allow(dead_code)]
+    pub fn get_colors(&self, steps: usize) -> Vec<Color> {
+        match &self.mode {
+            ColorMode::None => vec![],
+            ColorMode::Palette(palette) => (0..steps).map(|i| palette.get_color(i)).collect(),
+            ColorMode::Gradient(gradient) => gradient.colors(steps),
+        }
+    }
+
+    pub fn color_at(&self, t: f64) -> Option<Color> {
+        match &self.mode {
+            ColorMode::None => None,
+            ColorMode::Palette(palette) => {
+                Some(palette.get_color((t * palette.len() as f64) as usize))
+            }
+            ColorMode::Gradient(gradient) => Some(gradient.color_at(t)),
+        }
+    }
+}
+
+impl Default for ColorEngine {
+    fn default() -> Self {
+        Self::new()
+    }
+}

src/color/palette.rs

@@ -1,8 +1,53 @@
-"#ffff00".to_string(),
-        ]).unwrap()
+use crate::parser::color::Color;
+use anyhow::Result;
+
+#[derive(Debug, Clone)]
+pub struct ColorPalette {
+    colors: Vec<Color>,
+}
+
+impl ColorPalette {
+    pub fn new(colors: Vec<Color>) -> Self {
+        Self { colors }
     }
-    
+
+    pub fn from_strings(color_strs: &[String]) -> Result<Self> {
+        let colors: Result<Vec<Color>> = color_strs.iter().map(|s| Color::parse(s)).collect();
+        Ok(Self::new(colors?))
+    }
+
+    pub fn get_color(&self, index: usize) -> Color {
+        if self.colors.is_empty() {
+            return Color::new(255, 255, 255);
+        }
+        self.colors[index % self.colors.len()]
+    }
+
+    pub fn len(&self) -> usize {
+        self.colors.len()
+    }
+
+    #[allow(dead_code)]
+    pub fn is_empty(&self) -> bool {
+        self.colors.is_empty()
+    }
+
+    /// Create rainbow palette
+    pub fn rainbow() -> Self {
+        Self::from_strings(&[
+            "#ff0000".to_string(),
+            "#ff7f00".to_string(),
+            "#ffff00".to_string(),
+            "#00ff00".to_string(),
+            "#0000ff".to_string(),
+            "#4b0082".to_string(),
+            "#9400d3".to_string(),
+        ])
+        .unwrap()
+    }
+
     /// Create ocean palette
+    #[allow(dead_code)]
     pub fn ocean() -> Self {
         Self::from_strings(&[
             "#000080".to_string(),
@@ -10,7 +55,8 @@
             "#4169e1".to_string(),
             "#87ceeb".to_string(),
             "#add8e6".to_string(),
-        ]).unwrap()
+        ])
+        .unwrap()
     }
 }
 
@@ -18,4 +64,4 @@ impl Default for ColorPalette {
     fn default() -> Self {
         Self::rainbow()
     }
-}
+}

src/figlet.rs

@@ -1,4 +1,4 @@
-use anyhow::{Context, Result, bail};
+use anyhow::{bail, Context, Result};
 use std::process::Command;
 use which::which;
 
@@ -14,78 +14,75 @@ impl FigletWrapper {
             args: Vec::new(),
         }
     }
-    
+
     pub fn with_font(mut self, font: Option<&str>) -> Self {
         self.font = font.map(|s| s.to_string());
         self
     }
-    
+
     pub fn with_args(mut self, args: Vec<String>) -> Self {
         self.args = args;
         self
     }
-    
+
     pub fn render(&self, text: &str) -> Result<String> {
         let mut cmd = Command::new("figlet");
-        
+
         // Add font if specified
         if let Some(font) = &self.font {
             cmd.arg("-f").arg(font);
         }
-        
+
         // Add additional arguments
         for arg in &self.args {
             cmd.arg(arg);
         }
-        
+
         // Add the text
         cmd.arg(text);
-        
+
         // Execute and capture output
-        let output = cmd.output()
-            .context("Failed to execute figlet")?;
-        
+        let output = cmd.output().context("Failed to execute figlet")?;
+
         if !output.status.success() {
             let stderr = String::from_utf8_lossy(&output.stderr);
             bail!("Figlet error: {}", stderr);
         }
-        
-        let result = String::from_utf8(output.stdout)
-            .context("Figlet output is not valid UTF-8")?;
-        
+
+        let result =
+            String::from_utf8(output.stdout).context("Figlet output is not valid UTF-8")?;
+
         Ok(result)
     }
-    
+
     pub fn check_installed() -> Result<()> {
-        which("figlet")
-            .context("figlet not found. Please install figlet first.\n\
+        which("figlet").context(
+            "figlet not found. Please install figlet first.\n\
                      On Ubuntu/Debian: sudo apt-get install figlet\n\
                      On macOS: brew install figlet\n\
-                     On Arch: sudo pacman -S figlet")?;
+                     On Arch: sudo pacman -S figlet",
+        )?;
         Ok(())
     }
-    
+
+    #[allow(dead_code)]
     pub fn list_fonts() -> Result<Vec<String>> {
         let output = Command::new("figlet")
             .arg("-l")
             .output()
             .context("Failed to list figlet fonts")?;
-        
+
         if !output.status.success() {
             bail!("Failed to list fonts");
         }
-        
+
         let result = String::from_utf8_lossy(&output.stdout);
         let fonts: Vec<String> = result
             .lines()
             .skip(1) // Skip header
-            .filter_map(|line| {
-                line.split_whitespace()
-                    .next()
-                    .map(|s| s.to_string())
-            })
+            .filter_map(|line| line.split_whitespace().next().map(|s| s.to_string()))
             .collect();
-        
+
         Ok(fonts)
     }
 }
@@ -99,13 +96,13 @@ impl Default for FigletWrapper {
 #[cfg(test)]
 mod tests {
     use super::*;
-    
+
     #[test]
     fn test_figlet_installed() {
         // This test will fail if figlet is not installed
         assert!(FigletWrapper::check_installed().is_ok());
     }
-    
+
     #[test]
     fn test_basic_render() {
         let figlet = FigletWrapper::new();
@@ -115,4 +112,4 @@ mod tests {
         assert!(!ascii.is_empty());
         assert!(ascii.contains("H") || ascii.contains("_") || ascii.contains("|"));
     }
-}
+}

src/lib.rs

@@ -1,8 +1,8 @@
-pub mod cli;
-pub mod figlet;
-pub mod color;
 pub mod animation;
+pub mod cli;
+pub mod color;
+pub mod figlet;
 pub mod parser;
 pub mod utils;
 
-pub use cli::PigletCli;
+pub use cli::PigletCli;

src/main.rs

@@ -1,31 +1,31 @@
-mod cli;
-mod figlet;
-mod color;
 mod animation;
+mod cli;
+mod color;
+mod figlet;
 mod parser;
 mod utils;
 
 use anyhow::Result;
-use cli::PigletCli;
 use clap::Parser;
+use cli::PigletCli;
 
 #[tokio::main]
 async fn main() -> Result<()> {
     // Parse CLI arguments
     let args = PigletCli::parse();
-    
+
     // Show banner on first run
     if std::env::args().len() == 1 {
         show_welcome();
         return Ok(());
     }
-    
+
     // Verify figlet is installed
     figlet::FigletWrapper::check_installed()?;
-    
+
     // Run the piglet magic
     run_piglet(args).await?;
-    
+
     Ok(())
 }
 
@@ -33,69 +33,67 @@ async fn run_piglet(args: PigletCli) -> Result<()> {
     use crate::animation::AnimationEngine;
     use crate::color::ColorEngine;
     use crate::utils::terminal::TerminalManager;
-    
+
     // Parse duration
     let duration_ms = parser::duration::parse_duration(&args.duration)?;
-    
+
     // Create figlet wrapper and render base ASCII art
     let figlet = figlet::FigletWrapper::new()
         .with_font(args.font.as_deref())
         .with_args(args.figlet_args);
-    
+
     let ascii_art = figlet.render(&args.text)?;
-    
+
     // Setup color engine
     let color_engine = ColorEngine::new()
-        .with_palette(args.color_palette.as_deref())
+        .with_palette(args.color_palette.as_deref())?
         .with_gradient(args.color_gradient.as_deref())?;
-    
+
     // Setup animation engine
-    let animation_engine = AnimationEngine::new(
-        ascii_art,
-        duration_ms,
-        args.fps,
-    )
-    .with_effect(&args.motion_effect)?
-    .with_easing(&args.motion_ease)?
-    .with_color_engine(color_engine);
-    
+    let animation_engine = AnimationEngine::new(ascii_art, duration_ms, args.fps)
+        .with_effect(&args.motion_effect)?
+        .with_easing(&args.motion_ease)?
+        .with_color_engine(color_engine);
+
     // Setup terminal
     let mut terminal = TerminalManager::new()?;
     terminal.setup()?;
-    
+
     // Run animation
     loop {
         animation_engine.run(&mut terminal).await?;
-        
+
         if !args.loop_animation {
             break;
         }
     }
-    
+
     // Cleanup
     terminal.cleanup()?;
-    
+
     Ok(())
 }
 
 fn show_welcome() {
-    println!(r#"
-    ____  _       __     __ 
+    println!(
+        r"
+    ____  _       __     __
    / __ \(_)___ _/ /__  / /_
   / /_/ / / __ `/ / _ \/ __/
- / ____/ / /_/ / /  __/ /_  
-/_/   /_/\__, /_/\___/\__/  
-        /____/               
-        
+ / ____/ / /_/ / /  __/ /_
+/_/   /_/\__, /_/\___/\__/
+        /____/
+
 🐷 Piglet - Animated Figlet Wrapper
 
 Usage: piglet [TEXT] [OPTIONS]
 
 Examples:
-  piglet "Hello" -p "#FF5733,#33FF57"
-  piglet "World" -g "linear-gradient(90deg, red, blue)" -e fade-in
-  piglet "Cool!" -e typewriter -d 2s -i ease-out
+  piglet Hello -p red,blue,green
+  piglet World -g linear-gradient(90deg, red, blue) -e fade-in
+  piglet Cool! -e typewriter -d 2s -i ease-out
 
 Run 'piglet --help' for more information.
-"#);
-}
+"
+    );
+}

src/parser/color.rs

@@ -1,6 +1,5 @@
-use anyhow::{Result, Context};
+use anyhow::{Context, Result};
 use csscolorparser::Color as CssColor;
-use palette::rgb::Rgb;
 
 #[derive(Debug, Clone, Copy)]
 pub struct Color {
@@ -13,12 +12,35 @@ impl Color {
     pub fn new(r: u8, g: u8, b: u8) -> Self {
         Self { r, g, b }
     }
-    
+
     pub fn from_hex(hex: &str) -> Result<Self> {
-        let color = CssColor::parse(hex)
+        let color = hex
+            .parse::<CssColor>()
             .context(format!("Failed to parse hex color: {}", hex))?;
-        
+
         Ok(Self {
             r: (color.r * 255.0) as u8,
             g: (color.g * 255.0) as u8,
-            b
+            b: (color.b * 255.0) as u8,
+        })
+    }
+
+    pub fn parse(color_str: &str) -> Result<Self> {
+        Self::from_hex(color_str)
+    }
+
+    pub fn interpolate(&self, other: &Color, t: f64) -> Color {
+        let t = t.clamp(0.0, 1.0);
+        Color {
+            r: (self.r as f64 + (other.r as f64 - self.r as f64) * t) as u8,
+            g: (self.g as f64 + (other.g as f64 - self.g as f64) * t) as u8,
+            b: (self.b as f64 + (other.b as f64 - self.b as f64) * t) as u8,
+        }
+    }
+
+    #[allow(dead_code)]
+    #[allow(clippy::wrong_self_convention)]
+    pub fn to_ansi(&self) -> String {
+        format!("\x1b[38;2;{};{};{}m", self.r, self.g, self.b)
+    }
+}

src/parser/duration.rs

@@ -1,24 +1,24 @@
-use anyhow::{Result, bail};
-use regex::Regex;
+use anyhow::{bail, Result};
 use lazy_static::lazy_static;
+use regex::Regex;
 
 lazy_static! {
-    static ref DURATION_REGEX: Regex = Regex::new(
-        r"^(\d+(?:\.\d+)?)(ms|s|m|h)$"
-    ).unwrap();
+    static ref DURATION_REGEX: Regex = Regex::new(r"^(\d+(?:\.\d+)?)(ms|s|m|h)$").unwrap();
 }
 
 /// Parse duration string to milliseconds
 /// Supports: 3000ms, 0.3s, 5m, 0.5h
 pub fn parse_duration(duration: &str) -> Result<u64> {
-    let caps = DURATION_REGEX.captures(duration.trim())
+    let caps = DURATION_REGEX
+        .captures(duration.trim())
         .ok_or_else(|| anyhow::anyhow!("Invalid duration format: {}", duration))?;
-    
-    let value: f64 = caps[1].parse()
+
+    let value: f64 = caps[1]
+        .parse()
         .map_err(|_| anyhow::anyhow!("Invalid numeric value in duration"))?;
-    
+
     let unit = &caps[2];
-    
+
     let milliseconds = match unit {
         "ms" => value,
         "s" => value * 1000.0,
@@ -26,47 +26,47 @@ pub fn parse_duration(duration: &str) -> Result<u64> {
         "h" => value * 60.0 * 60.0 * 1000.0,
         _ => bail!("Unknown time unit: {}", unit),
     };
-    
+
     if milliseconds < 0.0 {
         bail!("Duration cannot be negative");
     }
-    
+
     Ok(milliseconds as u64)
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
-    
+
     #[test]
     fn test_parse_milliseconds() {
         assert_eq!(parse_duration("3000ms").unwrap(), 3000);
         assert_eq!(parse_duration("500ms").unwrap(), 500);
     }
-    
+
     #[test]
     fn test_parse_seconds() {
         assert_eq!(parse_duration("3s").unwrap(), 3000);
         assert_eq!(parse_duration("0.5s").unwrap(), 500);
         assert_eq!(parse_duration("1.5s").unwrap(), 1500);
     }
-    
+
     #[test]
     fn test_parse_minutes() {
         assert_eq!(parse_duration("1m").unwrap(), 60000);
         assert_eq!(parse_duration("0.5m").unwrap(), 30000);
     }
-    
+
     #[test]
     fn test_parse_hours() {
         assert_eq!(parse_duration("1h").unwrap(), 3600000);
         assert_eq!(parse_duration("0.5h").unwrap(), 1800000);
     }
-    
+
     #[test]
     fn test_invalid_format() {
         assert!(parse_duration("invalid").is_err());
         assert!(parse_duration("10").is_err());
         assert!(parse_duration("10x").is_err());
     }
-}
+}

src/parser/gradient.rs

@@ -0,0 +1,121 @@
+use crate::parser::color::Color;
+use anyhow::{bail, Result};
+
+#[derive(Debug, Clone)]
+pub struct ColorStop {
+    pub color: Color,
+    pub position: f64,
+}
+
+#[derive(Debug, Clone)]
+pub struct Gradient {
+    pub stops: Vec<ColorStop>,
+    #[allow(dead_code)] pub angle: f64,
+}
+
+impl Gradient {
+    pub fn new(stops: Vec<ColorStop>, angle: f64) -> Self {
+        Self { stops, angle }
+    }
+
+    pub fn parse(gradient_str: &str) -> Result<Self> {
+        let gradient_str = gradient_str.trim();
+
+        if !gradient_str.starts_with("linear-gradient(") {
+            bail!("Only linear-gradient is supported");
+        }
+
+        let content = gradient_str
+            .strip_prefix("linear-gradient(")
+            .and_then(|s| s.strip_suffix(")"))
+            .ok_or_else(|| anyhow::anyhow!("Invalid gradient syntax"))?;
+
+        let parts: Vec<&str> = content.split(',').map(|s| s.trim()).collect();
+
+        if parts.is_empty() {
+            bail!("Gradient must have at least one color");
+        }
+
+        let mut angle = 180.0;
+        let mut color_parts = parts.as_slice();
+
+        if let Some(first) = parts.first() {
+            if first.ends_with("deg") {
+                angle = first
+                    .trim_end_matches("deg")
+                    .trim()
+                    .parse()
+                    .unwrap_or(180.0);
+                color_parts = &parts[1..];
+            } else if first.starts_with("to ") {
+                angle = match first.trim() {
+                    "to right" => 90.0,
+                    "to left" => 270.0,
+                    "to top" => 0.0,
+                    "to bottom" => 180.0,
+                    _ => 180.0,
+                };
+                color_parts = &parts[1..];
+            }
+        }
+
+        let mut stops = Vec::new();
+        let count = color_parts.len();
+
+        for (i, part) in color_parts.iter().enumerate() {
+            let part = part.trim();
+            let mut color_str = part;
+            let mut position = i as f64 / (count - 1).max(1) as f64;
+
+            // Check if there's a percentage (e.g., "#FF5733 50%" or "red 50%")
+            if let Some(percent_pos) = part.rfind('%') {
+                // Find the last space before the percentage
+                if let Some(space_pos) = part[..percent_pos].rfind(|c: char| c.is_whitespace()) {
+                    color_str = part[..space_pos].trim();
+                    let percent_str = part[space_pos + 1..percent_pos].trim();
+                    if let Ok(p) = percent_str.parse::<f64>() {
+                        position = p / 100.0;
+                    }
+                }
+            }
+
+            let color = Color::parse(color_str)?;
+            stops.push(ColorStop { color, position });
+        }
+
+        Ok(Self::new(stops, angle))
+    }
+
+    pub fn color_at(&self, t: f64) -> Color {
+        if self.stops.is_empty() {
+            return Color::new(255, 255, 255);
+        }
+
+        if self.stops.len() == 1 {
+            return self.stops[0].color;
+        }
+
+        let t = t.clamp(0.0, 1.0);
+
+        for i in 0..self.stops.len() - 1 {
+            let stop1 = &self.stops[i];
+            let stop2 = &self.stops[i + 1];
+
+            if t >= stop1.position && t <= stop2.position {
+                let local_t = (t - stop1.position) / (stop2.position - stop1.position);
+                return stop1.color.interpolate(&stop2.color, local_t);
+            }
+        }
+
+        self.stops.last().unwrap().color
+    }
+
+    pub fn colors(&self, steps: usize) -> Vec<Color> {
+        (0..steps)
+            .map(|i| {
+                let t = i as f64 / (steps - 1).max(1) as f64;
+                self.color_at(t)
+            })
+            .collect()
+    }
+}

src/parser/mod.rs

@@ -1,3 +1,3 @@
-pub mod duration;
 pub mod color;
-pub mod gradient;
+pub mod duration;
+pub mod gradient;

src/utils/ascii.rs

@@ -1,5 +1,3 @@
-use crate::parser::color::Color;
-
 #[derive(Debug, Clone)]
 pub struct AsciiArt {
     lines: Vec<String>,
@@ -12,47 +10,49 @@ impl AsciiArt {
         let lines: Vec<String> = text.lines().map(|s| s.to_string()).collect();
         let width = lines.iter().map(|l| l.len()).max().unwrap_or(0);
         let height = lines.len();
-        
+
         Self {
             lines,
             width,
             height,
         }
     }
-    
+
     pub fn get_lines(&self) -> &[String] {
         &self.lines
     }
-    
+
     pub fn width(&self) -> usize {
         self.width
     }
-    
+
     pub fn height(&self) -> usize {
         self.height
     }
-    
-    pub fn to_string(&self) -> String {
+
+    pub fn render(&self) -> String {
         self.lines.join("\n")
     }
-    
+
     /// Get character at position
+    #[allow(dead_code)]
     pub fn char_at(&self, x: usize, y: usize) -> Option<char> {
         self.lines.get(y)?.chars().nth(x)
     }
-    
+
     /// Count non-whitespace characters
     pub fn char_count(&self) -> usize {
-        self.lines.iter()
+        self.lines
+            .iter()
             .flat_map(|line| line.chars())
             .filter(|c| !c.is_whitespace())
             .count()
     }
-    
+
     /// Get all character positions
     pub fn char_positions(&self) -> Vec<(usize, usize, char)> {
         let mut positions = Vec::new();
-        
+
         for (y, line) in self.lines.iter().enumerate() {
             for (x, ch) in line.chars().enumerate() {
                 if !ch.is_whitespace() {
@@ -60,72 +60,66 @@ impl AsciiArt {
                 }
             }
         }
-        
+
         positions
     }
-    
+
     /// Apply fade effect (0.0 = invisible, 1.0 = visible)
     pub fn apply_fade(&self, opacity: f64) -> String {
         if opacity >= 1.0 {
-            return self.to_string();
+            return self.render();
         }
-        
+
         if opacity <= 0.0 {
             return " ".repeat(self.width).repeat(self.height);
         }
-        
+
         // For ASCII, we can simulate fade by replacing chars with lighter ones
         let fade_chars = [' ', '.', '·', '-', '~', '=', '+', '*', '#', '@'];
         let index = (opacity * (fade_chars.len() - 1) as f64) as usize;
         let fade_char = fade_chars[index];
-        
-        self.lines.iter()
+
+        self.lines
+            .iter()
             .map(|line| {
                 line.chars()
-                    .map(|ch| {
-                        if ch.is_whitespace() {
-                            ch
-                        } else {
-                            fade_char
-                        }
-                    })
+                    .map(|ch| if ch.is_whitespace() { ch } else { fade_char })
                     .collect::<String>()
             })
             .collect::<Vec<_>>()
             .join("\n")
     }
-    
+
     /// Scale the ASCII art
     pub fn scale(&self, factor: f64) -> Self {
         if factor <= 0.0 {
             return Self::new(String::new());
         }
-        
+
         if (factor - 1.0).abs() < 0.01 {
             return self.clone();
         }
-        
+
         // Simple scaling by character repetition
-        let lines = if factor > 1.0 {
-            self.lines.iter()
+        let lines: Vec<String> = if factor > 1.0 {
+            self.lines
+                .iter()
                 .flat_map(|line| {
-                    let scaled_line: String = line.chars()
-                        .flat_map(|ch| std::iter::repeat(ch).take(factor as usize))
+                    let scaled_line: String = line
+                        .chars()
+                        .flat_map(|ch| std::iter::repeat_n(ch, factor as usize))
                         .collect();
-                    std::iter::repeat(scaled_line).take(factor as usize)
+                    std::iter::repeat_n(scaled_line, factor as usize)
                 })
                 .collect()
         } else {
-            self.lines.iter()
+            self.lines
+                .iter()
                 .step_by((1.0 / factor) as usize)
-                .map(|line| {
-                    line.chars()
-                        .step_by((1.0 / factor) as usize)
-                        .collect()
-                })
+                .map(|line| line.chars().step_by((1.0 / factor) as usize).collect())
                 .collect()
         };
-        
+
         Self::new(lines.join("\n"))
     }
-}
+}

src/utils/mod.rs

@@ -1,2 +1,2 @@
+pub mod ascii;
 pub mod terminal;
-pub mod ascii;

src/utils/terminal.rs

@@ -1,9 +1,7 @@
 use anyhow::Result;
 use crossterm::{
-    cursor,
-    execute,
+    cursor, execute,
     terminal::{self, ClearType},
-    ExecutableCommand,
 };
 use std::io::{stdout, Write};
 
@@ -22,74 +20,66 @@ impl TerminalManager {
             original_state: false,
         })
     }
-    
+
     pub fn setup(&mut self) -> Result<()> {
         terminal::enable_raw_mode()?;
-        execute!(
-            stdout(),
-            terminal::EnterAlternateScreen,
-            cursor::Hide
-        )?;
+        execute!(stdout(), terminal::EnterAlternateScreen, cursor::Hide)?;
         self.original_state = true;
         Ok(())
     }
-    
+
     pub fn cleanup(&mut self) -> Result<()> {
         if self.original_state {
-            execute!(
-                stdout(),
-                cursor::Show,
-                terminal::LeaveAlternateScreen
-            )?;
+            execute!(stdout(), cursor::Show, terminal::LeaveAlternateScreen)?;
             terminal::disable_raw_mode()?;
             self.original_state = false;
         }
         Ok(())
     }
-    
+
     pub fn clear(&self) -> Result<()> {
         execute!(stdout(), terminal::Clear(ClearType::All))?;
         Ok(())
     }
-    
+
     pub fn move_to(&self, x: u16, y: u16) -> Result<()> {
         execute!(stdout(), cursor::MoveTo(x, y))?;
         Ok(())
     }
-    
+
     pub fn get_size(&self) -> (u16, u16) {
         (self.width, self.height)
     }
-    
+
     pub fn refresh_size(&mut self) -> Result<()> {
         let (width, height) = terminal::size()?;
         self.width = width;
         self.height = height;
         Ok(())
     }
-    
+
     pub fn print_at(&self, x: u16, y: u16, text: &str) -> Result<()> {
         self.move_to(x, y)?;
         print!("{}", text);
         stdout().flush()?;
         Ok(())
     }
-    
+
     pub fn print_centered(&self, text: &str) -> Result<()> {
         let lines: Vec<&str> = text.lines().collect();
         let max_width = lines.iter().map(|l| l.len()).max().unwrap_or(0) as u16;
         let height = lines.len() as u16;
-        
+
         let start_x = (self.width.saturating_sub(max_width)) / 2;
         let start_y = (self.height.saturating_sub(height)) / 2;
-        
+
         for (i, line) in lines.iter().enumerate() {
             let line_width = line.len() as u16;
             let x = start_x + (max_width.saturating_sub(line_width)) / 2;
             let y = start_y + i as u16;
             self.print_at(x, y, line)?;
         }
-        
+
         Ok(())
     }
 }
@@ -98,4 +88,4 @@ impl Drop for TerminalManager {
     fn drop(&mut self) {
         let _ = self.cleanup();
     }
-}
+}

tests/integration_tests.rs

@@ -1,11 +1,11 @@
+use anyhow::Result;
 use piglet::{
-    figlet::FigletWrapper,
-    parser::{duration::parse_duration, color::Color, gradient::Gradient},
-    color::{ColorEngine, palette::ColorPalette},
     animation::easing::get_easing_function,
     animation::effects::get_effect,
+    color::{palette::ColorPalette, ColorEngine},
+    figlet::FigletWrapper,
+    parser::{color::Color, duration::parse_duration, gradient::Gradient},
 };
-use anyhow::Result;
 
 #[test]
 fn test_figlet_wrapper() -> Result<()> {
@@ -31,12 +31,12 @@ fn test_color_parser() -> Result<()> {
     assert_eq!(color.r, 255);
     assert_eq!(color.g, 87);
     assert_eq!(color.b, 51);
-    
+
     let color = Color::parse("red")?;
     assert_eq!(color.r, 255);
     assert_eq!(color.g, 0);
     assert_eq!(color.b, 0);
-    
+
     Ok(())
 }
 
@@ -44,15 +44,14 @@ fn test_color_parser() -> Result<()> {
 fn test_gradient_parser() -> Result<()> {
     let gradient = Gradient::parse("linear-gradient(90deg, red, blue)")?;
     assert_eq!(gradient.stops.len(), 2);
-    
-    let gradient = Gradient::parse(
-        "linear-gradient(to right, #FF5733 0%, #33FF57 50%, #3357FF 100%)"
-    )?;
+
+    let gradient =
+        Gradient::parse("linear-gradient(to right, #FF5733 0%, #33FF57 50%, #3357FF 100%)")?;
     assert_eq!(gradient.stops.len(), 3);
     assert_eq!(gradient.stops[0].position, 0.0);
     assert_eq!(gradient.stops[1].position, 0.5);
     assert_eq!(gradient.stops[2].position, 1.0);
-    
+
     Ok(())
 }
 
@@ -61,7 +60,7 @@ fn test_color_interpolation() {
     let red = Color::new(255, 0, 0);
     let blue = Color::new(0, 0, 255);
     let purple = red.interpolate(&blue, 0.5);
-    
+
     assert_eq!(purple.r, 127);
     assert_eq!(purple.g, 0);
     assert_eq!(purple.b, 127);
@@ -69,19 +68,16 @@ fn test_color_interpolation() {
 
 #[test]
 fn test_color_palette() -> Result<()> {
-    let palette = ColorPalette::from_strings(&[
-        "red".to_string(),
-        "green".to_string(),
-        "blue".to_string(),
-    ])?;
-    
+    let palette =
+        ColorPalette::from_strings(&["red".to_string(), "green".to_string(), "blue".to_string()])?;
+
     assert_eq!(palette.len(), 3);
-    
+
     let color = palette.get_color(0);
     assert_eq!(color.r, 255);
     assert_eq!(color.g, 0);
     assert_eq!(color.b, 0);
-    
+
     Ok(())
 }
 
@@ -89,15 +85,15 @@ fn test_color_palette() -> Result<()> {
 fn test_easing_functions() -> Result<()> {
     let linear = get_easing_function("linear")?;
     assert_eq!(linear.ease(0.5), 0.5);
-    
+
     let ease_in = get_easing_function("ease-in")?;
     let result = ease_in.ease(0.5);
-    assert!(result >= 0.0 && result <= 1.0);
-    
+    assert!((0.0..=1.0).contains(&result));
+
     let ease_out_bounce = get_easing_function("ease-out-bounce")?;
     let result = ease_out_bounce.ease(0.5);
-    assert!(result >= 0.0 && result <= 1.5); // Bounce can overshoot
-    
+    assert!((0.0..=1.5).contains(&result)); // Bounce can overshoot
+
     Ok(())
 }
 
@@ -105,45 +101,44 @@ fn test_easing_functions() -> Result<()> {
 fn test_effects() -> Result<()> {
     let fade_in = get_effect("fade-in")?;
     assert_eq!(fade_in.name(), "fade-in");
-    
+
     let typewriter = get_effect("typewriter")?;
     assert_eq!(typewriter.name(), "typewriter");
-    
+
     let bounce = get_effect("bounce-in")?;
     assert_eq!(bounce.name(), "bounce-in");
-    
+
     Ok(())
 }
 
 #[test]
 fn test_color_engine() -> Result<()> {
-    let engine = ColorEngine::new()
-        .with_palette(Some(&["red".to_string(), "blue".to_string()]))?;
-    
+    let engine = ColorEngine::new().with_palette(Some(&["red".to_string(), "blue".to_string()]))?;
+
     assert!(engine.has_colors());
-    
+
     let color = engine.get_color(0.0, 0);
     assert!(color.is_some());
-    
+
     Ok(())
 }
 
 #[test]
 fn test_gradient_color_at() -> Result<()> {
     let gradient = Gradient::parse("linear-gradient(red, blue)")?;
-    
+
     let color_start = gradient.color_at(0.0);
     assert_eq!(color_start.r, 255);
     assert_eq!(color_start.b, 0);
-    
+
     let color_end = gradient.color_at(1.0);
     assert_eq!(color_end.r, 0);
     assert_eq!(color_end.b, 255);
-    
+
     let color_mid = gradient.color_at(0.5);
     assert!(color_mid.r > 0 && color_mid.r < 255);
     assert!(color_mid.b > 0 && color_mid.b < 255);
-    
+
     Ok(())
 }
 
@@ -168,4 +163,4 @@ fn test_invalid_effect() {
 #[test]
 fn test_invalid_easing() {
     assert!(get_easing_function("not-an-easing").is_err());
-}
+}