P24

convert_to_webp.sh

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+#!/bin/bash
+
+# Batch convert all PNG/JPG/JPEG to WebP
+# Usage: ./convert_to_webp.sh
+# Output: appends .webp to each filename (e.g., "file.png" -> "file.png.webp")
+# This avoids filename collisions - you can clean up names later
+
+set -e
+
+echo "=== WebP Batch Conversion ==="
+echo "Starting at: $(date)"
+echo ""
+
+TOTAL_ORIGINAL=0
+TOTAL_WEBP=0
+CONVERTED=0
+SKIPPED=0
+
+# Function to format bytes
+format_bytes() {
+    local bytes=$1
+    if (( bytes >= 1073741824 )); then
+        echo "$(echo "scale=2; $bytes / 1073741824" | bc) GB"
+    elif (( bytes >= 1048576 )); then
+        echo "$(echo "scale=2; $bytes / 1048576" | bc) MB"
+    elif (( bytes >= 1024 )); then
+        echo "$(echo "scale=2; $bytes / 1024" | bc) KB"
+    else
+        echo "$bytes B"
+    fi
+}
+
+echo "Processing PNG files (lossless)..."
+for f in *.png; do
+    [ -f "$f" ] || continue
+    
+    original_size=$(stat -c%s "$f")
+    TOTAL_ORIGINAL=$((TOTAL_ORIGINAL + original_size))
+    
+    output="${f}.webp"
+    
+    # Skip if already converted
+    if [ -f "$output" ]; then
+        echo "  SKIP (already exists): $f"
+        SKIPPED=$((SKIPPED + 1))
+        continue
+    fi
+    
+    echo -n "  Converting: $f ... "
+    cwebp -lossless "$f" -o "$output" > /dev/null 2>&1
+    
+    if [ -f "$output" ] && [ -s "$output" ]; then
+        webp_size=$(stat -c%s "$output")
+        TOTAL_WEBP=$((TOTAL_WEBP + webp_size))
+        savings=$((original_size - webp_size))
+        pct=$(echo "scale=1; $savings * 100 / $original_size" | bc)
+        echo "DONE [$(format_bytes $original_size) -> $(format_bytes $webp_size) | ${pct}% saved]"
+        CONVERTED=$((CONVERTED + 1))
+    else
+        echo "FAILED"
+    fi
+done
+
+echo ""
+echo "Processing JPG/JPEG files (quality 100)..."
+for f in *.jpg *.jpeg; do
+    [ -f "$f" ] || continue
+    
+    original_size=$(stat -c%s "$f")
+    TOTAL_ORIGINAL=$((TOTAL_ORIGINAL + original_size))
+    
+    output="${f}.webp"
+    
+    # Skip if already converted
+    if [ -f "$output" ]; then
+        echo "  SKIP (already exists): $f"
+        SKIPPED=$((SKIPPED + 1))
+        continue
+    fi
+    
+    echo -n "  Converting: $f ... "
+    cwebp -q 100 "$f" -o "$output" > /dev/null 2>&1
+    
+    if [ -f "$output" ] && [ -s "$output" ]; then
+        webp_size=$(stat -c%s "$output")
+        TOTAL_WEBP=$((TOTAL_WEBP + webp_size))
+        savings=$((original_size - webp_size))
+        pct=$(echo "scale=1; $savings * 100 / $original_size" | bc)
+        echo "DONE [$(format_bytes $original_size) -> $(format_bytes $webp_size) | ${pct}% saved]"
+        CONVERTED=$((CONVERTED + 1))
+    else
+        echo "FAILED"
+    fi
+done
+
+echo ""
+echo "=== Summary ==="
+echo "Converted: $CONVERTED files"
+echo "Skipped:   $SKIPPED files (already exist)"
+echo ""
+echo "Original total: $(format_bytes $TOTAL_ORIGINAL)"
+echo "WebP total:     $(format_bytes $TOTAL_WEBP)"
+
+if [ $TOTAL_ORIGINAL -gt 0 ]; then
+    SAVINGS=$((TOTAL_ORIGINAL - TOTAL_WEBP))
+    PCT=$(echo "scale=1; $SAVINGS * 100 / $TOTAL_ORIGINAL" | bc)
+    echo "Space saved:   $(format_bytes $SAVINGS) ($PCT%)"
+fi
+
+echo ""
+echo "Finished at: $(date)"
+echo ""
+echo "=== Git LFS Note ==="
+echo "The .webp files are NOT added to git."
+echo "To track them with Git LFS later, run:"
+echo "  git lfs track '*.webp'"
+echo "  git add .gitattributes"
+echo "  git add *.webp"
+echo "  git commit -m 'Add WebP versions'"