name: "Contrast Check" on: pull_request: paths: - 'css/brands.css' workflow_dispatch: # Manual trigger for testing jobs: contrast-check: runs-on: ubuntu-latest steps: - name: Checkout code uses: actions/checkout@v3 with: fetch-depth: 0 - name: Setup for PR comparison run: | echo "Fetching base branch for comparison" git fetch origin ${{ github.base_ref }} - name: Contrast Check (Review Me) run: | cat > contrast-check.sh << 'EOF' #!/bin/bash # WCAG Minimum Contrast Ratio MIN_CONTRAST=4.5 FAILED=0 ALL_RESOLVED=1 NEEDS_MANUAL_REVIEW=0 # Only get buttons that were modified in the PR echo "Finding changed button styles..." BUTTON_CLASSES=$(git diff origin/$GITHUB_BASE_REF -- css/brands.css | grep -E "^\+.*\.button-[a-zA-Z0-9]+" | sed -E 's/.*\.button-([a-zA-Z0-9]+).*/\1/' | sort -u) if [[ -z "$BUTTON_CLASSES" ]]; then echo "✅ No button changes to check." exit 0 fi echo "Found button classes to check: $BUTTON_CLASSES" echo "🔍 Auditing CSS for contrast issues..." # Function to normalize hex colors to lowercase normalize_color() { local color="$1" if [[ -n "$color" ]]; then echo "$color" | tr '[:upper:]' '[:lower:]' else echo "" fi } # Function to calculate luminance get_luminance() { local color="$1" if [[ -z "$color" || "$color" == "#" ]]; then echo 0 return fi color="${color#'#'}" if [[ ${#color} -ne 6 ]]; then echo 0 return fi r=$(printf "%d" 0x${color:0:2} 2>/dev/null || echo 0) g=$(printf "%d" 0x${color:2:2} 2>/dev/null || echo 0) b=$(printf "%d" 0x${color:4:2} 2>/dev/null || echo 0) r=$(awk "BEGIN { print ($r/255 <= 0.03928) ? ($r/255)/12.92 : ((($r/255) + 0.055)/1.055) ^ 2.4 }") g=$(awk "BEGIN { print ($g/255 <= 0.03928) ? ($g/255)/12.92 : ((($g/255) + 0.055)/1.055) ^ 2.4 }") b=$(awk "BEGIN { print ($b/255 <= 0.03928) ? ($b/255)/12.92 : ((($b/255) + 0.055)/1.055) ^ 2.4 }") echo $(awk "BEGIN { print (0.2126 * $r) + (0.7152 * $g) + (0.0722 * $b) }") } # Function to calculate contrast ratio get_contrast_ratio() { local lum1=$(get_luminance "$1") local lum2=$(get_luminance "$2") if [[ -z "$lum1" || -z "$lum2" ]]; then echo 0 return fi if (( $(awk "BEGIN { print ($lum1 > $lum2) ? 1 : 0 }") )); then awk "BEGIN { printf \"%.5f\", ($lum1 + 0.05) / ($lum2 + 0.05) }" else awk "BEGIN { printf \"%.5f\", ($lum2 + 0.05) / ($lum1 + 0.05) }" fi } # Function to extract hex color extract_color() { local input="$1" local color="" if [[ "$input" =~ "#[0-9a-fA-F]{6}" ]]; then color=$(echo "$input" | grep -o "#[0-9a-fA-F]\{6\}") elif [[ "$input" =~ "1px solid #" ]]; then color=$(echo "$input" | sed -E 's/.*1px solid (#[0-9a-fA-F]{6}).*/\1/') elif [[ "$input" =~ "solid #" ]]; then color=$(echo "$input" | sed -E 's/.*solid (#[0-9a-fA-F]{6}).*/\1/') elif [[ "$input" =~ "#" ]]; then color=$(echo "$input" | grep -o "#[0-9a-fA-F]*" | head -1) fi # Return normalized (lowercase) hex color normalize_color "$color" } # Check contrast check_contrast() { local text_color="$1" local background_color="$2" local context="$3" local border_color="$4" local recommend_stroke="$5" local is_background_check="$6" local button_name="$7" local check_failed=0 # Normalize all colors to lowercase for comparison text_color=$(normalize_color "$text_color") background_color=$(normalize_color "$background_color") border_color=$(normalize_color "$border_color") recommend_stroke=$(normalize_color "$recommend_stroke") if [[ -z "$text_color" || -z "$background_color" ]]; then return 0 fi local contrast_ratio=$(get_contrast_ratio "$text_color" "$background_color") if [[ -z "$contrast_ratio" ]]; then contrast_ratio=0 fi contrast_ratio=$(printf "%.2f" "$contrast_ratio") # Case-insensitive comparison for hex colors if (( $(awk "BEGIN { print ($contrast_ratio < $MIN_CONTRAST) ? 1 : 0 }") )); then if [[ -n "$border_color" && "$border_color" == "$recommend_stroke" && "$is_background_check" -eq 1 ]]; then echo "✅ [$context → $button_name] Contrast ratio $contrast_ratio fails WCAG but has a $recommend_stroke border → Treated as passing." echo "✅ [$context → $button_name] Issue resolved by stroke → Fully passing." check_failed=0 else echo "❌ [$context → $button_name] Contrast ratio $contrast_ratio fails WCAG — Recommend adding a $recommend_stroke stroke." check_failed=1 fi else echo "✅ [$context → $button_name] Contrast ratio $contrast_ratio passes WCAG" check_failed=0 fi return $check_failed } # For each button class, check its properties for button_class in $BUTTON_CLASSES; do echo "Checking button: $button_class" # Extract button section # Avoid partial matches button_start=$(grep -n "\.button-$button_class\( \|{\)" css/brands.css | cut -d: -f1) if [[ -z "$button_start" ]]; then button_start=$(grep -n "\.button-$button_class$" css/brands.css | cut -d: -f1) fi if [[ -z "$button_start" ]]; then echo "Could not find button-$button_class in css/brands.css" continue fi # Look for the next closing bracket button_end=$(tail -n +$button_start css/brands.css | grep -n "}" | head -1 | cut -d: -f1) if [[ -z "$button_end" ]]; then button_end=10 fi button_section=$(tail -n +$button_start css/brands.css | head -n $button_end) # Check for gradient if echo "$button_section" | grep -q "background-image"; then echo "🚩 [./css/brands.css → $button_class] Detected gradient background → Flagging for manual review." NEEDS_MANUAL_REVIEW=1 continue fi # Extract colors text_color=$(echo "$button_section" | grep "button-text" | grep -o "#[0-9A-Fa-f]*") bg_color=$(echo "$button_section" | grep "button-background" | grep -o "#[0-9A-Fa-f]*") border_color=$(extract_color "$(echo "$button_section" | grep "button-border")") button_failed=0 # Check text vs background if [[ -n "$text_color" && -n "$bg_color" ]]; then check_contrast "$text_color" "$bg_color" "TEXT vs BUTTON" "$border_color" "" 0 "$button_class" button_failed=$((button_failed | $?)) fi # Check button vs light theme if [[ -n "$bg_color" ]]; then check_contrast "#ffffff" "$bg_color" "BUTTON vs LIGHT THEME" "$border_color" "#000000" 1 "$button_class" button_failed=$((button_failed | $?)) # Check button vs dark theme check_contrast "#121212" "$bg_color" "BUTTON vs DARK THEME" "$border_color" "#ffffff" 1 "$button_class" button_failed=$((button_failed | $?)) fi if [[ $button_failed -eq 1 ]]; then FAILED=1 ALL_RESOLVED=0 fi done # Final report if [[ "$NEEDS_MANUAL_REVIEW" -eq 1 ]]; then echo "⚠️ Manual review required for gradients!" exit 1 elif [[ "$ALL_RESOLVED" -eq 1 ]]; then echo "✅ All contrast checks passed!" exit 0 else echo "❌ Contrast issues found!" exit 1 fi EOF chmod +x contrast-check.sh ./contrast-check.sh env: GITHUB_BASE_REF: ${{ github.base_ref }}