+Compressed IMG files

scripts/generate_webp_previews.sh

@@ -0,0 +1,127 @@
+#!/bin/bash
+
+# Script to generate WebP preview images from existing JPEG files
+# Usage: ./scripts/generate_webp_previews.sh
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Configuration
+QUALITY=75          # WebP quality (0-100)
+COMPRESSION=6       # WebP compression level (0-6, higher = better compression)
+PICTURES_DIR="pictures"
+
+# Check if cwebp is installed
+if ! command -v cwebp &> /dev/null; then
+    echo -e "${RED}Error: cwebp is not installed. Please install WebP tools:${NC}"
+    echo "  Ubuntu/Debian: sudo apt-get install webp"
+    echo "  macOS: brew install webp"
+    echo "  CentOS/RHEL: sudo yum install libwebp-tools"
+    exit 1
+fi
+
+# Check if pictures directory exists
+if [ ! -d "$PICTURES_DIR" ]; then
+    echo -e "${RED}Error: Pictures directory '$PICTURES_DIR' not found${NC}"
+    exit 1
+fi
+
+echo -e "${GREEN}Generating WebP preview images...${NC}"
+echo "Quality: $QUALITY%"
+echo "Compression: $COMPRESSION"
+echo ""
+
+# Counters
+processed=0
+skipped=0
+errors=0
+
+# Function to process a single file
+process_file() {
+    local jpg_file="$1"
+
+    # Skip if already a preview file
+    if [[ "$jpg_file" =~ -preview\.(jpg|jpeg)$ ]]; then
+        return 0
+    fi
+
+    # Generate output filename
+    dir=$(dirname "$jpg_file")
+    filename=$(basename "$jpg_file")
+    name_no_ext="${filename%.*}"
+    webp_file="$dir/${name_no_ext}-preview.webp"
+
+    # Skip if WebP preview already exists and is newer than source
+    if [ -f "$webp_file" ] && [ "$webp_file" -nt "$jpg_file" ]; then
+        echo -e "${YELLOW}Skipping $jpg_file (preview exists and is newer)${NC}"
+        return 0
+    fi
+
+    # Convert to WebP
+    echo "Processing: $jpg_file -> $webp_file"
+
+    if cwebp -q "$QUALITY" -m "$COMPRESSION" "$jpg_file" -o "$webp_file" 2>/dev/null; then
+        # Check file sizes
+        jpg_size=$(stat -f%z "$jpg_file" 2>/dev/null || stat -c%s "$jpg_file" 2>/dev/null)
+        webp_size=$(stat -f%z "$webp_file" 2>/dev/null || stat -c%s "$webp_file" 2>/dev/null)
+
+        if [ -n "$jpg_size" ] && [ -n "$webp_size" ]; then
+            reduction=$(( (jpg_size - webp_size) * 100 / jpg_size ))
+            echo -e "${GREEN}  ✓ Success! Size reduction: ${reduction}%${NC}"
+        else
+            echo -e "${GREEN}  ✓ Success!${NC}"
+        fi
+        return 0
+    else
+        echo -e "${RED}  ✗ Failed to convert $jpg_file${NC}"
+        return 1
+    fi
+}
+
+# Export the function and variables for parallel execution
+export -f process_file
+export QUALITY COMPRESSION GREEN RED YELLOW NC
+
+# Detect number of CPU cores for parallel processing
+CPU_CORES=$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 4)
+PARALLEL_JOBS=$((CPU_CORES))
+
+echo "Using $PARALLEL_JOBS parallel jobs (detected $CPU_CORES CPU cores)"
+echo ""
+
+# Find all JPG files and process them in parallel
+find "$PICTURES_DIR" -type f \( -name "*.jpg" -o -name "*.jpeg" \) | \
+    grep -v -E '\-preview\.(jpg|jpeg)$' | \
+    xargs -n 1 -P "$PARALLEL_JOBS" -I {} bash -c 'process_file "$@"' _ {}
+
+# Wait for all background processes to complete
+wait
+
+# Count actual results
+total_files=$(find "$PICTURES_DIR" -type f \( -name "*.jpg" -o -name "*.jpeg" \) | grep -v -E '\-preview\.(jpg|jpeg)$' | wc -l)
+preview_files=$(find "$PICTURES_DIR" -type f -name "*-preview.webp" | wc -l)
+processed=$preview_files
+skipped=0
+errors=$((total_files - processed))
+
+# Final summary
+echo ""
+echo -e "${GREEN}=== Summary ===${NC}"
+echo "Processed: $processed files"
+echo "Skipped: $skipped files"
+echo "Errors: $errors files"
+
+if [ $errors -eq 0 ]; then
+    echo -e "${GREEN}All conversions completed successfully!${NC}"
+else
+    echo -e "${YELLOW}Completed with $errors errors${NC}"
+fi
+
+# Calculate total space saved (optional)
+echo ""
+echo "To see space savings, run:"
+echo "  find $PICTURES_DIR -name '*-preview.webp' -exec du -ch {} + | tail -1"
+echo "  find $PICTURES_DIR -name '*.jpg' -exec du -ch {} + | tail -1"