feat: add script to generate preview gifs and add them to the README

README.md

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+# Ghostty Shader Previews
+
+A collection of shader previews for Ghostty terminal.
+
+## animated-gradient-shader
+
+![animated-gradient-shader](shader_previews/animated-gradient-shader.gif)
+
+## bettercrt
+
+![bettercrt](shader_previews/bettercrt.gif)
+
+## bloom
+
+![bloom](shader_previews/bloom.gif)
+
+## crt
+
+![crt](shader_previews/crt.gif)
+
+## cubes
+
+![cubes](shader_previews/cubes.gif)
+
+## dither
+
+![dither](shader_previews/dither.gif)
+
+## drunkard
+
+![drunkard](shader_previews/drunkard.gif)
+
+## fireworks-rockets
+
+![fireworks-rockets](shader_previews/fireworks-rockets.gif)
+
+## fireworks
+
+![fireworks](shader_previews/fireworks.gif)
+
+## galaxy
+
+![galaxy](shader_previews/galaxy.gif)
+
+## gears-and-belts
+
+![gears-and-belts](shader_previews/gears-and-belts.gif)
+
+## glitchy
+
+![glitchy](shader_previews/glitchy.gif)
+
+## glow-rgbsplit-twitchy
+
+![glow-rgbsplit-twitchy](shader_previews/glow-rgbsplit-twitchy.gif)
+
+## gradient-background
+
+![gradient-background](shader_previews/gradient-background.gif)
+
+## inside-the-matrix
+
+![inside-the-matrix](shader_previews/inside-the-matrix.gif)
+
+## just-snow
+
+![just-snow](shader_previews/just-snow.gif)
+
+## matrix-hallway
+
+![matrix-hallway](shader_previews/matrix-hallway.gif)
+
+## negative
+
+![negative](shader_previews/negative.gif)
+
+## retro-terminal
+
+![retro-terminal](shader_previews/retro-terminal.gif)
+
+## smoke-and-ghost
+
+![smoke-and-ghost](shader_previews/smoke-and-ghost.gif)
+
+## sparks-from-fire
+
+![sparks-from-fire](shader_previews/sparks-from-fire.gif)
+
+## spotlight
+
+![spotlight](shader_previews/spotlight.gif)
+
+## starfield-colors
+
+![starfield-colors](shader_previews/starfield-colors.gif)
+
+## starfield
+
+![starfield](shader_previews/starfield.gif)
+
+## tft
+
+![tft](shader_previews/tft.gif)
+
+## underwater
+
+![underwater](shader_previews/underwater.gif)
+
+## water
+
+![water](shader_previews/water.gif)

generate-previews.sh

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+#!/bin/bash
+
+CONFIG_FILE="$HOME/Library/Application Support/com.mitchellh.ghostty/config"
+BACKUP_FILE="$CONFIG_FILE.backup"
+
+# Check if ffmpeg is installed
+if ! command -v ffmpeg &> /dev/null; then
+    echo "ffmpeg is required but not installed. Please install it with 'brew install ffmpeg'"
+    exit 1
+fi
+
+# Create videos directory if it doesn't exist and clean existing recordings
+rm -rf shader_previews
+mkdir -p shader_previews
+
+# Start README.md with a header
+echo "# Ghostty Shader Previews" > README.md
+echo "" >> README.md
+echo "A collection of shader previews for Ghostty terminal." >> README.md
+echo "" >> README.md
+
+# Capture original shader setting
+ORIGINAL_SHADER=$(grep "^custom-shader=" "$CONFIG_FILE" || echo "")
+
+# Create backup of original config
+cp "$CONFIG_FILE" "$BACKUP_FILE"
+
+# Loop through all .glsl files in the current directory
+for file in *.glsl; do
+    if [ -f "$file" ]; then
+        echo "Applying shader: $file"
+
+        # Remove existing custom-shader line if it exists
+        sed -i '' '/^custom-shader = /d' "$CONFIG_FILE"
+
+        # Add new shader config on a new line, ensuring there's a blank line before it
+        echo "" >> "$CONFIG_FILE"
+        echo "custom-shader = $(pwd)/$file" >> "$CONFIG_FILE"
+
+        # Get filename without extension for the video name
+        filename=$(basename "$file" .glsl)
+
+        # Open Ghostty
+        open -a Ghostty
+
+        # Give it a moment to open
+        sleep 2
+
+        # Type commands using AppleScript
+        osascript -e 'tell application "System Events"
+            keystroke "cd '"$(pwd)"' && ls -la"
+            key code 36 # Return key
+        end tell'
+
+        # First capture video at reduced size
+        ffmpeg -f avfoundation -capture_cursor 1 -i "0:none" -t 10 \
+            -vf "scale=iw/2:ih/2" \
+            -c:v libx264 -preset fast \
+            -y "shader_previews/${filename}_temp.mp4"
+
+        # Convert to optimized GIF
+        ffmpeg -i "shader_previews/${filename}_temp.mp4" \
+            -vf "fps=10,scale=480:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
+            -loop 0 \
+            "shader_previews/${filename}.gif"
+
+        # Remove temporary video
+        rm "shader_previews/${filename}_temp.mp4"
+
+        # Close Ghostty (force kill if necessary)
+        pkill -9 -x "ghostty"
+
+        # Give it a moment to close
+        sleep 1
+
+        # Add shader section to README.md
+        echo "## ${filename}" >> README.md
+        echo "" >> README.md
+        echo "![${filename}](shader_previews/${filename}.gif)" >> README.md
+        echo "" >> README.md
+    fi
+done
+
+# Restore original config
+cp "$BACKUP_FILE" "$CONFIG_FILE"
+
+# If there was an original shader, restore it properly
+if [ -n "$ORIGINAL_SHADER" ]; then
+    sed -i '' '/^custom-shader=/d' "$CONFIG_FILE"
+    echo "" >> "$CONFIG_FILE"
+    echo "$ORIGINAL_SHADER" >> "$CONFIG_FILE"
+fi
+
+rm "$BACKUP_FILE"