Create lucene dsl

search/src/main/kotlin/LuceneDsl.kt

@@ -0,0 +1,35 @@
+package be.simplenotes.search
+
+import org.apache.lucene.index.Term
+import org.apache.lucene.search.BooleanClause
+import org.apache.lucene.search.BooleanQuery
+import org.apache.lucene.search.FuzzyQuery
+import org.apache.lucene.search.Query
+
+fun query(receiver: LuceneDsl.() -> Unit): Query {
+    val builder = BooleanQuery.Builder()
+    val dsl = LuceneDsl()
+    dsl.apply { this.receiver() }
+    dsl.clauses.forEach { (field, query) ->
+        query?.let {
+            builder.add(BooleanClause(FuzzyQuery(Term(field, query)), BooleanClause.Occur.SHOULD))
+        }
+    }
+    return builder.build()
+}
+
+class LuceneDsl {
+    val clauses = mutableListOf<BooleanExpression>()
+
+    fun addBooleanClause(booleanDsl: BooleanExpression) {
+        clauses.add(booleanDsl)
+    }
+}
+
+fun LuceneDsl.or(booleanExpression: () -> BooleanExpression) {
+    addBooleanClause(booleanExpression())
+}
+
+infix fun String.eq(query: String?) = BooleanExpression(this, query)
+
+data class BooleanExpression(val term: String, val query: String?)

search/src/main/kotlin/NoteSearcherImpl.kt

@@ -86,25 +86,12 @@ class NoteSearcherImpl(basePath: Path = Path.of("/tmp", "lucene")) : NoteSearche
     override fun search(userId: Int, terms: SearchTerms): List<PersistedNoteMetadata> {
         val searcher = getIndexSearcher(userId)
 
-        val builder = BooleanQuery.Builder()
-
-        terms.title?.let {
-            val titleQuery = FuzzyQuery(Term(titleField, it))
-            builder.add(BooleanClause(titleQuery, BooleanClause.Occur.SHOULD))
+        val query = query {
+            or { titleField eq terms.title }
+            or { tagsField eq terms.tag }
+            or { contentField eq terms.content }
         }
 
-        terms.tag?.let {
-            val tagsQuery = FuzzyQuery(Term(tagsField, it))
-            builder.add(BooleanClause(tagsQuery, BooleanClause.Occur.SHOULD))
-        }
-
-        terms.content?.let {
-            val contentQuery = FuzzyQuery(Term(contentField, it))
-            builder.add(BooleanClause(contentQuery, BooleanClause.Occur.SHOULD))
-        }
-
-        val query = builder.build()
-
         val topDocs = searcher.search(query, 10)
         logger.debug("Searching: `$query` results: ${topDocs.totalHits.value}")
         return topDocs.toResults(searcher)