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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
using System.Linq;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;
namespace Microsoft.DotNet.Arcade.Sdk
{
/// <summary>
/// Groups items by ItemSpec.
///
/// Given the following items:
/// <![CDATA[
/// <ItemGroup>
/// <Stuff Include="A" Value="X"/>
/// <Stuff Include="A" Value="Y"/>
/// <Stuff Include="B" Value="Z"/>
/// </ItemGroup>
/// ]]>
///
/// produces
///
/// <![CDATA[
/// <ItemGroup>
/// <Stuff Include="A" Value="X;Y"/>
/// <Stuff Include="B" Value="Z"/>
/// </ItemGroup>
/// ]]>
///
/// </summary>
public sealed class GroupItemsBy : Microsoft.Build.Utilities.Task
{
/// <summary>
/// Items to group by their ItemSpec.
/// </summary>
[Required]
public ITaskItem[] Items { get; set; }
/// <summary>
/// Names of custom metadata to group (e.g. "Value" in the example above).
/// When merging two items the values of metadata in this set are merged into a list,
/// while the first value is used for metadata not in this set.
/// </summary>
[Required]
public string[] GroupMetadata { get; set; }
/// <summary>
/// Items with grouped metadata values.
/// </summary>
[Output]
public ITaskItem[] GroupedItems { get; set; }
public override bool Execute()
{
ITaskItem mergeItems(IEnumerable<ITaskItem> items)
{
var result = items.First();
foreach (var item in items.Skip(1))
{
foreach (string metadataName in GroupMetadata)
{
var left = result.GetMetadata(metadataName);
var right = item.GetMetadata(metadataName);
result.SetMetadata(metadataName,
(string.IsNullOrEmpty(left) || left == right) ? right : string.IsNullOrEmpty(right) ? left : left + ";" + right);
}
}
return result;
}
GroupedItems = (from item in Items
group item by item.ItemSpec
into itemsWithEqualKey
select mergeItems(itemsWithEqualKey)).ToArray();
return true;
}
}
}
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