Merge pull request #26 from MO2k4/feat/search-query-utils

feat: Search query utilities + multi-signal scoring

src/db/queries.ts

@@ -18,6 +18,7 @@ import {
   SearchResult,
 } from '../types';
 import { safeJsonParse } from '../utils';
+import { kindBonus, scorePathRelevance } from '../search/query-utils';
 
 /**
  * Database row types (snake_case from SQLite)
@@ -451,6 +452,15 @@ export class QueryBuilder {
       results = this.searchNodesLike(query, { kinds, languages, limit, offset });
     }
 
+    // Apply multi-signal scoring
+    if (results.length > 0 && query) {
+      results = results.map(r => ({
+        ...r,
+        score: r.score + kindBonus(r.node.kind) + scorePathRelevance(r.node.filePath, query),
+      }));
+      results.sort((a, b) => b.score - a.score);
+    }
+
     return results;
   }
 
@@ -463,9 +473,11 @@ export class QueryBuilder {
     // Add prefix wildcard for better matching (e.g., "auth" matches "AuthService", "authenticate")
     // Escape special FTS5 characters and add prefix wildcard
     const ftsQuery = query
-      .replace(/['"*()]/g, '') // Remove special chars
+      .replace(/['"*():^]/g, '') // Remove FTS5 special chars
       .split(/\s+/)
       .filter(term => term.length > 0)
+      // Strip FTS5 boolean operators to prevent query manipulation
+      .filter(term => !/^(AND|OR|NOT|NEAR)$/i.test(term))
       .map(term => `"${term}"*`) // Prefix match each term
       .join(' OR ');
 

src/search/query-utils.ts

@@ -0,0 +1,89 @@
+/**
+ * Search Query Utilities
+ *
+ * Shared module for search term extraction and scoring.
+ */
+
+import * as path from 'path';
+import { Node } from '../types';
+
+/**
+ * Common stop words to filter from search queries
+ */
+export const STOP_WORDS = new Set([
+  'the', 'a', 'an', 'and', 'or', 'but', 'in', 'on', 'at', 'to', 'for',
+  'of', 'with', 'by', 'from', 'is', 'it', 'that', 'this', 'are', 'was',
+  'be', 'has', 'had', 'have', 'do', 'does', 'did', 'will', 'would', 'could',
+  'should', 'may', 'might', 'can', 'shall', 'not', 'no', 'all', 'each',
+  'every', 'how', 'what', 'where', 'when', 'who', 'which', 'why',
+  'i', 'me', 'my', 'we', 'our', 'you', 'your', 'he', 'she', 'they',
+  'find', 'show', 'get', 'list', 'give', 'tell',
+]);
+
+/**
+ * Extract meaningful search terms from a natural language query
+ */
+export function extractSearchTerms(query: string): string[] {
+  return query
+    .toLowerCase()
+    .replace(/[^\w\s-]/g, ' ')
+    .split(/\s+/)
+    .filter(term => term.length > 1 && !STOP_WORDS.has(term));
+}
+
+/**
+ * Score path relevance to a query
+ * Higher score = more relevant path
+ */
+export function scorePathRelevance(filePath: string, query: string): number {
+  const terms = extractSearchTerms(query);
+  if (terms.length === 0) return 0;
+
+  const pathLower = filePath.toLowerCase();
+  const fileName = path.basename(filePath).toLowerCase();
+  const dirName = path.dirname(filePath).toLowerCase();
+  let score = 0;
+
+  for (const term of terms) {
+    // Exact filename match (strongest)
+    if (fileName.includes(term)) score += 10;
+    // Directory match
+    if (dirName.includes(term)) score += 5;
+    // General path match
+    else if (pathLower.includes(term)) score += 3;
+  }
+
+  return score;
+}
+
+/**
+ * Kind-based bonus for search ranking
+ * Functions and classes are typically more relevant than variables/imports
+ */
+export function kindBonus(kind: Node['kind']): number {
+  const bonuses: Record<string, number> = {
+    function: 10,
+    method: 10,
+    class: 8,
+    interface: 7,
+    type_alias: 6,
+    struct: 6,
+    trait: 6,
+    enum: 5,
+    component: 8,
+    route: 9,
+    module: 4,
+    property: 3,
+    field: 3,
+    variable: 2,
+    constant: 3,
+    import: 1,
+    export: 1,
+    parameter: 0,
+    namespace: 4,
+    file: 0,
+    protocol: 6,
+    enum_member: 3,
+  };
+  return bonuses[kind] ?? 0;
+}