Initial commit

commands/refactor/.scripts/detect-duplication.sh

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+#!/bin/bash
+
+# Purpose: Detect code duplication using jsinspect
+# Version: 1.0.0
+# Usage: ./detect-duplication.sh <scope> [threshold]
+# Returns: 0 on success, 1 on error
+# Dependencies: npx, jsinspect
+
+set -euo pipefail
+
+# Configuration
+SCOPE="${1:-.}"
+THRESHOLD="${2:-80}"
+MIN_INSTANCES="${3:-2}"
+OUTPUT_FILE="duplication-report.json"
+
+# Colors for output
+RED='\033[0;31m'
+YELLOW='\033[1;33m'
+GREEN='\033[0;32m'
+NC='\033[0m' # No Color
+
+# Check if scope exists
+if [ ! -e "$SCOPE" ]; then
+  echo -e "${RED}Error: Scope does not exist: $SCOPE${NC}" >&2
+  exit 1
+fi
+
+echo "Detecting code duplication in: $SCOPE"
+echo "Similarity threshold: ${THRESHOLD}%"
+echo "Minimum instances: $MIN_INSTANCES"
+echo ""
+
+# Check if npx is available
+if ! command -v npx &> /dev/null; then
+  echo -e "${RED}Error: npx not found. Please install Node.js and npm.${NC}" >&2
+  exit 1
+fi
+
+# Run jsinspect
+echo "Analyzing code for duplicates..."
+
+npx jsinspect "$SCOPE" \
+  --threshold "$THRESHOLD" \
+  --min-instances "$MIN_INSTANCES" \
+  --ignore "node_modules|dist|build|coverage|test|__tests__|*.spec.*|*.test.*" \
+  --reporter json \
+  > "$OUTPUT_FILE" 2>&1 || true
+
+# Parse results
+if [ -f "$OUTPUT_FILE" ]; then
+  # Check if output is valid JSON
+  if ! jq empty "$OUTPUT_FILE" 2>/dev/null; then
+    # Not JSON, probably text output or error
+    if [ -s "$OUTPUT_FILE" ]; then
+      echo -e "${YELLOW}Warning: Output is not JSON format${NC}"
+      cat "$OUTPUT_FILE"
+    else
+      echo -e "${GREEN}No duplicates found!${NC}"
+      echo "Duplication threshold: ${THRESHOLD}%"
+      echo "Status: PASSED"
+      rm -f "$OUTPUT_FILE"
+      exit 0
+    fi
+  else
+    # Valid JSON output
+    DUPLICATE_COUNT=$(jq 'length' "$OUTPUT_FILE")
+
+    if [ "$DUPLICATE_COUNT" -eq 0 ]; then
+      echo -e "${GREEN}No duplicates found!${NC}"
+      echo "Duplication threshold: ${THRESHOLD}%"
+      echo "Status: PASSED"
+      rm -f "$OUTPUT_FILE"
+      exit 0
+    fi
+
+    echo ""
+    echo "=== Duplication Analysis Results ==="
+    echo "Duplicate blocks found: $DUPLICATE_COUNT"
+    echo ""
+
+    # Show duplicate details
+    echo -e "${RED}Duplicate Code Blocks:${NC}"
+    echo ""
+
+    jq -r '
+      .[] |
+      "Block \(.id // "N/A"):",
+      "  Lines: \(.lines)",
+      "  Instances: \(.instances | length)",
+      "  Locations:",
+      (.instances[] | "    - \(.path):\(.lines[0])-\(.lines[1])"),
+      ""
+    ' "$OUTPUT_FILE" | head -100
+
+    echo ""
+    echo "Full report saved to: $OUTPUT_FILE"
+
+    # Calculate statistics
+    TOTAL_INSTANCES=$(jq '[.[].instances | length] | add' "$OUTPUT_FILE")
+    AVG_LINES=$(jq '[.[].lines] | add / length | floor' "$OUTPUT_FILE")
+
+    echo ""
+    echo "=== Statistics ==="
+    echo "Total duplicate instances: $TOTAL_INSTANCES"
+    echo "Average duplicate size: $AVG_LINES lines"
+    echo ""
+
+    if [ "$DUPLICATE_COUNT" -gt 10 ]; then
+      echo -e "${RED}Status: HIGH DUPLICATION - $DUPLICATE_COUNT blocks found${NC}"
+    elif [ "$DUPLICATE_COUNT" -gt 5 ]; then
+      echo -e "${YELLOW}Status: MODERATE DUPLICATION - $DUPLICATE_COUNT blocks found${NC}"
+    else
+      echo -e "${YELLOW}Status: LOW DUPLICATION - $DUPLICATE_COUNT blocks found${NC}"
+    fi
+
+    echo ""
+    echo "Recommendations:"
+    echo "1. Extract duplicate code to shared functions/components"
+    echo "2. Use parameterization to reduce duplication"
+    echo "3. Consider design patterns (Strategy, Template Method)"
+  fi
+else
+  echo -e "${RED}Error: Failed to generate duplication report${NC}" >&2
+  exit 1
+fi
+
+exit 0