Display parameter names in a structured way

Fixes #817

Author: KirillOsenkov

src/StructuredLogViewer/themes/Generic.xaml

@@ -439,6 +439,28 @@
     </HierarchicalDataTemplate.Triggers>
   </HierarchicalDataTemplate>
 
+  <HierarchicalDataTemplate DataType="{x:Type l:TaskParameterItem}"
+                            ItemsSource="{Binding Children}">
+    <StackPanel Orientation="Horizontal">
+      <Path x:Name="icon"
+          Data="{DynamicResource AddItemGeometry}"
+          VerticalAlignment="Center"
+          Width="14"
+          Height="11"
+          Margin="3,3,6,3"
+          Stroke="{DynamicResource ItemStroke}"
+          Fill="{DynamicResource ItemBrush}" />
+      <TextBlock x:Name="label" Text="Add Item " />
+      <TextBlock Text="{Binding Name}" />
+      <TextBlock x:Name="parameterName" Text="{Binding ParameterName}" Foreground="Gray" Margin="16,0,0,0" />
+    </StackPanel>
+    <HierarchicalDataTemplate.Triggers>
+      <DataTrigger Binding="{Binding IsSelected}" Value="False">
+        <Setter TargetName="label" Property="Foreground" Value="{DynamicResource AddItemStroke}" />
+      </DataTrigger>
+    </HierarchicalDataTemplate.Triggers>
+  </HierarchicalDataTemplate>
+
   <HierarchicalDataTemplate DataType="{x:Type l:RemoveItem}"
                             ItemsSource="{Binding Children}">
     <StackPanel Orientation="Horizontal">
@@ -571,11 +593,26 @@
     </DataTemplate.Triggers>
   </DataTemplate>
 
+  <DataTemplate DataType="{x:Type l:TaskParameterProperty}">
+    <StackPanel Orientation="Horizontal">
+      <Rectangle x:Name="icon" Style="{StaticResource NodeIcon}" Stroke="{DynamicResource PropertyStroke}" Fill="{DynamicResource PropertyBrush}" />
+      <TextBlock x:Name="label" Text="{Binding NameAndEquals, Mode=OneTime}" />
+      <TextBlock Text="{Binding ShortenedValue}" />
+      <TextBlock x:Name="parameterName" Text="{Binding ParameterName}" Foreground="Gray" Margin="16,0,0,0" />
+    </StackPanel>
+    <DataTemplate.Triggers>
+      <DataTrigger Binding="{Binding IsSelected}" Value="False">
+        <Setter TargetName="label" Property="Foreground" Value="{DynamicResource PropertyStroke}" />
+      </DataTrigger>
+    </DataTemplate.Triggers>
+  </DataTemplate>
+
   <HierarchicalDataTemplate DataType="{x:Type l:Parameter}"
                             ItemsSource="{Binding Children}">
     <StackPanel Orientation="Horizontal">
       <Rectangle x:Name="icon" Style="{StaticResource NodeIcon}" Stroke="{DynamicResource ParameterStroke}" Fill="{DynamicResource ParameterBrush}" />
       <TextBlock x:Name="name" Text="{Binding Name}" />
+      <TextBlock x:Name="parameterName" Text="{Binding ParameterName}" Foreground="Gray" Margin="16,0,0,0" />
     </StackPanel>
     <HierarchicalDataTemplate.Triggers>
       <DataTrigger Binding="{Binding IsSelected}" Value="False">

src/StructuredLogger/Construction/MessageProcessor.cs

@@ -198,11 +198,9 @@ private void ProcessTaskParameter(TaskParameterEventArgs args)
                 parent = task.GetOrCreateNodeWithName<Folder>(folderName);
                 parent.DisableChildrenCache = true;
 
-                string itemName = isOutput && parameterName is not null
-                    ? $"{propertyName ?? itemType} from parameter {parameterName}"
-                    : propertyName ?? itemType;
+                string itemName = propertyName ?? itemType;
 
-                node = CreateParameterNode(itemName, items, isOutput);
+                node = CreateParameterNode(itemName, items, isOutput, parameterName);
             }
             else if (
                 kind == TaskParameterMessageKind.AddItem ||
@@ -254,26 +252,53 @@ private void ProcessTaskParameter(TaskParameterEventArgs args)
             }
         }
 
-        private BaseNode CreateParameterNode(string itemName, IEnumerable items, bool isOutput = false)
+        private BaseNode CreateParameterNode(string itemName, IEnumerable items, bool isOutput = false, string parameterName = null)
         {
             if (items is IList<ITaskItem> list && list.Count == 1 && list[0] is ITaskItem scalar && scalar.MetadataCount == 0)
             {
-                var property = new Property
+                BaseNode property;
+                if (parameterName != null && parameterName != itemName)
                 {
-                    Name = itemName,
-                    Value = scalar.ItemSpec
-                };
+                    property = new TaskParameterProperty
+                    {
+                        Name = itemName,
+                        Value = scalar.ItemSpec,
+                        ParameterName = parameterName
+                    };
+                }
+                else
+                {
+                    property = new Property
+                    {
+                        Name = itemName,
+                        Value = scalar.ItemSpec
+                    };
+                }
+
                 return property;
             }
 
             TreeNode parent;
             if (isOutput)
             {
-                parent = new AddItem { Name = itemName };
+                if (!string.IsNullOrEmpty(parameterName) && parameterName != itemName)
+                {
+                    parent = new TaskParameterItem { Name = itemName, ParameterName = parameterName };
+                }
+                else
+                {
+                    parent = new AddItem { Name = itemName };
+                }
             }
             else
             {
-                parent = new Parameter { Name = itemName };
+                // no need to display the same string twice
+                if (parameterName == itemName)
+                {
+                    parameterName = null;
+                }
+
+                parent = new Parameter { Name = itemName, ParameterName = parameterName };
                 parent.DisableChildrenCache = true;
             }
 

src/StructuredLogger/ObjectModel/AddItem.cs

@@ -11,4 +11,9 @@ public AddItem()
 
         public int? LineNumber { get; set; }
     }
+
+    public class TaskParameterItem : AddItem
+    {
+        public string ParameterName { get; set; }
+    }
 }

src/StructuredLogger/ObjectModel/Parameter.cs

@@ -3,5 +3,7 @@
     public class Parameter : NamedNode
     {
         public override string TypeName => nameof(Parameter);
+
+        public string ParameterName { get; set; }
     }
 }

src/StructuredLogger/ObjectModel/Property.cs

@@ -4,4 +4,9 @@ public class Property : NameValueNode
     {
         public override string TypeName => nameof(Property);
     }
+
+    public class TaskParameterProperty : Property
+    {
+        public string ParameterName { get; set; }
+    }
 }