Checklists: Allow items to be removed

lib/core/checklist.dart

@@ -62,22 +62,33 @@ class Checklist {
   }
 
   void addItem(bool value, String text) {
+    if (!text.endsWith('\n')) {
+      text += '\n';
+    }
     var elem = md.Element.withTag("input");
     elem.attributes["type"] = "checkbox";
     elem.attributes["checked"] = value.toString();
     elem.attributes["xUpperCase"] = "false";
-    elem.attributes["text"] = text + "\n";
+    elem.attributes["text"] = text;
 
     items.add(ChecklistItem.fromMarkdownElement(elem));
     nodes.add(elem);
   }
+
+  void removeItem(ChecklistItem item) {
+    assert(nodes.contains(item.element));
+    assert(items.contains(item));
+
+    nodes.remove(item.element);
+    items.remove(item);
+  }
 }
 
 /// Copied from flutter-markdown - cannot be merged as we added xUpperCase and changed the regexp
 /// Parse [task list items](https://github.github.com/gfm/#task-list-items-extension-).
 class TaskListSyntax extends md.InlineSyntax {
   // FIXME: Waiting for dart-lang/markdown#269 to land
-  static final String _pattern = r'^ *\[([ xX])\] +(.*)$';
+  static final String _pattern = r'^ *\[([ xX])\] +(.*)\n';
 
   TaskListSyntax() : super(_pattern);
 
@@ -158,7 +169,11 @@ class CustomRenderer implements md.NodeVisitor {
         } else {
           buffer.write('[ ] ');
         }
-        buffer.write(el.attributes['text']);
+        var text = el.attributes['text'];
+        buffer.write(text);
+        if (!text.endsWith('\n')) {
+          buffer.write('\n');
+        }
       }
     }
   }

lib/editors/checklist_editor.dart

@@ -121,8 +121,7 @@ class ChecklistEditorState extends State<ChecklistEditor>
       },
       itemRemoved: () {
         setState(() {
-          // FIXME: The body isn't a good indicator, there could be multiple with the same body!
-          // todos.removeWhere((t) => t.body == todo.body);
+          checklist.removeItem(item);
         });
       },
     );

test/checklist_test.dart

@@ -32,6 +32,7 @@ How are you doing?
 [x] item 2
 [x] item 3
 [ ] item 4
+[ ] item 5
 
 Booga Wooga
 """;
@@ -44,17 +45,19 @@ Booga Wooga
       await note.load();
 
       var checklist = Checklist(note);
-      expect(checklist.items.length, equals(4));
+      expect(checklist.items.length, equals(5));
 
       expect(checklist.items[0].checked, false);
       expect(checklist.items[1].checked, true);
       expect(checklist.items[2].checked, true);
       expect(checklist.items[3].checked, false);
+      expect(checklist.items[4].checked, false);
 
       expect(checklist.items[0].text, "item 1");
       expect(checklist.items[1].text, "item 2");
       expect(checklist.items[2].text, "item 3");
       expect(checklist.items[3].text, "item 4");
+      expect(checklist.items[4].text, "item 5");
 
       //
       // Serialization
@@ -65,6 +68,8 @@ Booga Wooga
       checklist.items[1].text = "Foo";
       checklist.addItem(false, "Howdy");
 
+      checklist.removeItem(checklist.items[4]);
+
       await checklist.note.save();
 
       var expectedContent = """---