Implement loading dependencies for mods

lib/mod_list.dart

@@ -5,13 +5,13 @@ import 'package:rimworld_modman/mod.dart';
 import 'package:xml/xml.dart';
 
 class ModList {
-  final String configPath;
+  String configPath = '';
-  final String modsPath;
+  String modsPath = '';
   // O(1) lookup
   Map<String, bool> activeMods = {};
   Map<String, Mod> mods = {};
 
-  ModList({required this.configPath, required this.modsPath});
+  ModList({this.configPath = '', this.modsPath = ''});
 
   Stream<Mod> loadAvailable() async* {
     final logger = Logger.instance;
@@ -184,6 +184,18 @@ class ModList {
     }
   }
 
+  void enableAll() {
+    for (final mod in mods.values) {
+      setEnabled(mod.id, true);
+    }
+  }
+
+  void disableAll() {
+    for (final mod in mods.values) {
+      setEnabled(mod.id, false);
+    }
+  }
+
   List<List<String>> checkIncompatibilities() {
     List<List<String>> conflicts = [];
     List<String> activeModIds = activeMods.keys.toList();
@@ -387,6 +399,20 @@ class ModList {
 
     return bestOrder;
   }
+
+  List<String> loadRequired() {
+    final toEnable = <String>[];
+    for (final modid in activeMods.keys) {
+      final mod = mods[modid]!;
+      for (final dep in mod.dependencies) {
+        toEnable.add(dep);
+      }
+    }
+    for (final modid in toEnable) {
+      setEnabled(modid, true);
+    }
+    return generateLoadOrder();
+  }
 }
 
 String _expansionNameFromId(String id) {

test/mod_list_test.dart

@@ -8,7 +8,7 @@ const configRoot = '$root/AppData/RimWorld by Ludeon Studios/Config';
 const configPath = '$configRoot/ModsConfig.xml';
 const logsPath = '$root/ModManager';
 
-void main() {
+Map<String, Mod> generateDummyMods() {
   final dummyMod = Mod(
     name: 'Dummy Mod',
     id: 'dummy',
@@ -32,6 +32,13 @@ void main() {
       loadBefore: ["ludeon.rimworld"],
       size: 47,
     ),
+    'prepatcher': dummyMod.copyWith(
+      name: 'Prepatcher',
+      id: 'prepatcher',
+      loadAfter: ["ludeon.rimworld"],
+      dependencies: ["harmony"],
+      size: 47,
+    ),
     'ludeon.rimworld': dummyMod.copyWith(
       name: 'RimWorld',
       id: 'ludeon.rimworld',
@@ -56,11 +63,14 @@ void main() {
     ),
   };
 
-  final dummyList = ModList(configPath: configPath, modsPath: modsRoot);
+  return dummyMods;
-  dummyList.mods.addAll(dummyMods);
-  for (final mod in dummyMods.keys) {
-    dummyList.setEnabled(mod, true);
 }
+
+void main() {
+  final dummyMods = generateDummyMods();
+  final dummyList = ModList();
+  dummyList.mods = dummyMods;
+  dummyList.enableAll();
   dummyList.setEnabled('disabledDummy', false);
   dummyList.setEnabled('incompatible', false);
   final sortedMods = dummyList.generateLoadOrder();
@@ -71,6 +81,13 @@ void main() {
       final rimworldIndex = sortedMods.indexOf('ludeon.rimworld');
       expect(harmonyIndex, lessThan(rimworldIndex));
     });
+    test('Prepatcher should load after Harmony and RimWorld', () {
+      final prepatcherIndex = sortedMods.indexOf('prepatcher');
+      final harmonyIndex = sortedMods.indexOf('harmony');
+      final rimworldIndex = sortedMods.indexOf('ludeon.rimworld');
+      expect(prepatcherIndex, greaterThan(harmonyIndex));
+      expect(prepatcherIndex, greaterThan(rimworldIndex));
+    });
     test('RimWorld should load before Anomaly', () {
       final rimworldIndex = sortedMods.indexOf('ludeon.rimworld');
       final anomalyIndex = sortedMods.indexOf('ludeon.rimworld.anomaly');
@@ -85,9 +102,32 @@ void main() {
       final yuuugeIndex = sortedMods.indexOf('yuuuge');
       expect(yuuugeIndex, lessThan(smolIndex));
     });
-    dummyList.setEnabled('incompatible', true);
     test('Error generating load order with incompatible mods', () {
+      dummyList.setEnabled('incompatible', true);
       expect(() => dummyList.generateLoadOrder(), throwsException);
     });
   });
+
+  final dummyMods2 = generateDummyMods();
+  final dummyList2 = ModList();
+  dummyList2.mods = dummyMods2;
+  dummyList2.disableAll();
+  dummyList2.setEnabled('prepatcher', true);
+  final sortedMods2 = dummyList2.loadRequired();
+  group('Test loadRequired', () {
+    test(
+      'Harmony should get enabled by loadRequired as a dependency of prepatcher',
+      () {
+        final harmonyIndex = sortedMods2.indexOf('harmony');
+        expect(harmonyIndex, isNot(-1));
+      },
+    );
+    test('No other mods should get enabled', () {
+      for (final mod in dummyMods2.keys) {
+        if (mod != 'prepatcher' && mod != 'harmony') {
+          expect(sortedMods2.indexOf(mod), isNegative);
+        }
+      }
+    });
+  });
 }