Collapsable description

Makefile

@@ -30,3 +30,6 @@ run-linux-debug-native: build-linux-debug-container
 
 run-web-debug-native: build-web-debug-container
 	cd build/web && python3 -m http.server $${WEB_PORT:-8081}
+
+ai:
+	qwen --prompt-interactive --yolo "Read CLAUDE.md. Implement first task not already done in TODO.md"

TODO.md

@@ -1,7 +1,8 @@
 [ ] Means not done
 [x] Means done
 
-- [ ] Unify error reporting. Create class ErrorHandler that get notified of every catched exception. This class prints the exception in stdout.
+- [X] Unify error reporting. Create class ErrorHandler that get notified of every catched exception. This class prints the exception in stdout.
+- [ ] Make formula description collapsable in FormulaScreen. Initialy, the description is visible, but the user can hide it.
 - Refactor formula and unit loading:
   - [ ] Create method `List<Object?> parseD4rtLiteral(String arrayStringLiteral). It parses a d4rt array literal (containing maps and arrays) to a List<Object?> using d4rt
   - [ ] Remove `fromArrayStringLiteral` from UnitSpec and Formula.
@@ -20,3 +21,4 @@
   - [ ] From now on, the corpus will be loaded from database instead of assets
 - [ ] Create method List<UnitSpec> Corpus.withDependencies(Formula formula). It will return the list of units of the formula, and related units from the corpus.
 - [ ] Add a Share button to the formula list. It will export the array string literal of the formula with the units from Corpus.withDependencies().
+- [ ] Replace flutter-markdown with flutter-markdown-plus

lib/ai/formula_screen.dart

@@ -65,6 +65,7 @@ class _FormulaScreenState extends State<FormulaScreen> {
   final Map<String, String?> _selectedValues = {}; // for string dropdowns
   String? _result;
   String? _selectedOutputUnit;
+  bool _isDescriptionExpanded = true; // Track description expansion state
 
   @override
   void initState() {
@@ -194,17 +195,25 @@ class _FormulaScreenState extends State<FormulaScreen> {
       return const SizedBox.shrink();
     }
 
-    return Column(
+    return Card(
-      crossAxisAlignment: CrossAxisAlignment.start,
+      margin: const EdgeInsets.only(bottom: 16),
-      children: [
+      child: ExpansionTile(
-        Text(
+        title: Text(
           'Description',
-          style: Theme.of(
+          style: Theme.of(context).textTheme.titleMedium?.copyWith(
-            context,
+            fontWeight: FontWeight.bold,
-          ).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
           ),
-        const SizedBox(height: 8),
+        ),
-        Container(
+        initiallyExpanded: _isDescriptionExpanded,
+        onExpansionChanged: (bool expanded) {
+          setState(() {
+            _isDescriptionExpanded = expanded;
+          });
+        },
+        children: [
+          Padding(
+            padding: const EdgeInsets.all(16.0),
+            child: Container(
               padding: const EdgeInsets.all(8),
               decoration: BoxDecoration(
                 color: Theme.of(context).colorScheme.surfaceVariant,
@@ -222,8 +231,9 @@ class _FormulaScreenState extends State<FormulaScreen> {
                 ),
               ),
             ),
-        const SizedBox(height: 24),
+          ),
         ],
+      ),
     );
   }
 

lib/error_handler.dart

@@ -24,6 +24,20 @@ class ErrorHandler {
     onError?.call(error, stackTrace);
   }
 
+  /// Convenience method to wrap code that might throw exceptions
+  T handleError<T>(T Function() operation, {T? defaultValue}) {
+    try {
+      return operation();
+    } catch (error, stackTrace) {
+      notify(error, stackTrace);
+
+      if (defaultValue != null) {
+        return defaultValue;
+      }
+
+      rethrow;
+    }
+  }
 }
 
 /// Global instance of ErrorHandler for easy access

test/error_handler_test.dart

@@ -31,10 +31,10 @@ void main() {
         errors.add(error);
       };
       
-      int result = errorHandler.handleError(() => 42, defaultValue: 0);
+      int result = ErrorHandler().handleError(() => 42, defaultValue: 0);
       expect(result, 42);
       
-      result = errorHandler.handleError(() {
+      result = ErrorHandler().handleError(() {
         throw Exception('Handled exception');
       }, defaultValue: 100);
       
@@ -49,7 +49,7 @@ void main() {
       };
       
       expect(() {
-        errorHandler.handleError(() {
+        ErrorHandler().handleError(() {
           throw Exception('Rethrown exception');
         });
       }, throwsA(const TypeMatcher<Exception>()));