cli/query_word: add --json flag

lib/cli/commands/query_word.dart

@@ -1,3 +1,4 @@
+import 'dart:convert';
 import 'dart:io';
 
 import 'package:jadb/_data_ingestion/open_local_db.dart';
@@ -15,6 +16,12 @@ class QueryWord extends Command {
   QueryWord() {
     addLibsqliteArg(argParser);
     addJadbArg(argParser);
+
+    argParser.addFlag(
+      'json',
+      abbr: 'j',
+      help: 'Output results in JSON format',
+    );
   }
 
   Future<void> run() async {
@@ -42,13 +49,25 @@ class QueryWord extends Command {
     final int? maybeId = int.tryParse(searchWord);
 
     if (maybeId != null && maybeId >= 1000000) {
-      await _searchId(db, maybeId);
+      await _searchId(
+        db,
+        maybeId,
+        argResults!.flag('json'),
+      );
     } else {
-      await _searchWord(db, searchWord);
+      await _searchWord(
+        db,
+        searchWord,
+        argResults!.flag('json'),
+      );
     }
   }
 
-  Future<void> _searchId(DatabaseExecutor db, int id) async {
+  Future<void> _searchId(
+    DatabaseExecutor db,
+    int id,
+    bool jsonOutput,
+  ) async {
     final time = Stopwatch()..start();
     final result = await JaDBConnection(db).jadbGetWordById(id);
     time.stop();
@@ -56,13 +75,21 @@ class QueryWord extends Command {
     if (result == null) {
       print("Invalid ID");
     } else {
-      print(result.toString());
+      if (jsonOutput) {
+        print(JsonEncoder.withIndent('  ').convert(result));
+      } else {
+        print(result.toString());
+      }
     }
 
     print("Query took ${time.elapsedMilliseconds}ms");
   }
 
-  Future<void> _searchWord(DatabaseExecutor db, String searchWord) async {
+  Future<void> _searchWord(
+    DatabaseExecutor db,
+    String searchWord,
+    bool jsonOutput,
+  ) async {
     final time = Stopwatch()..start();
     final count = await JaDBConnection(db).jadbSearchWordCount(searchWord);
     time.stop();
@@ -76,9 +103,13 @@ class QueryWord extends Command {
     } else if (result.isEmpty) {
       print("No matches");
     } else {
-      for (final e in result) {
-        print(e.toString());
-        print("");
+      if (jsonOutput) {
+        print(JsonEncoder.withIndent('  ').convert(result));
+      } else {
+        for (final e in result) {
+          print(e.toString());
+          print("");
+        }
       }
     }