SemanticVersioning.targets

<?xml version="1.0" encoding="utf-8"?>
<Project>
	<PropertyGroup>
		<!-- We are loaded *before* NuGet.Build.Tasks.Pack.targets, so we can't use the $(NuGetPackTaskAssemblyFile) and $(NuGetBuildTasksPackTargets) properties.
		     Thus we re-define some of the things here based on $(MSBuildToolsPath). Let's hope it doesn't break. -->
		<_NuGetVersioningAssemblyFile Condition="'$(MSBuildRuntimeType)' == 'Core'">$(MSBuildToolsPath)/Sdks/NuGet.Build.Tasks.Pack/CoreCLR/NuGet.Versioning.dll</_NuGetVersioningAssemblyFile>
		<_NuGetVersioningAssemblyFile Condition="'$(MSBuildRuntimeType)' != 'Core'">$(MSBuildToolsPath)/Sdks/NuGet.Build.Tasks.Pack/Desktop/NuGet.Versioning.dll</_NuGetVersioningAssemblyFile>
		<_NuGetVersioningAssemblyFile Condition="!$([System.IO.Path]::Exists('$(_NuGetVersioningAssemblyFile)'))">$(MSBuildToolsPath)/NuGet.Versioning.dll</_NuGetVersioningAssemblyFile>
	</PropertyGroup>
	<UsingTask TaskName="GenerateSemanticVersionRanges" TaskFactory="RoslynCodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll">
		<ParameterGroup>
			<ProjectReferencesWithVersions ParameterType="Microsoft.Build.Framework.ITaskItem[]" Required="true" />
			<ProjectReferencesWithExactVersions ParameterType="Microsoft.Build.Framework.ITaskItem[]" Output="true" />
		</ParameterGroup>
		<Task>
			<Reference Include="$(_NuGetVersioningAssemblyFile)" />
			<Using Namespace="NuGet.Versioning" />
			<!-- language=C# -->
			<Code Type="Fragment" Language="cs"><![CDATA[
				foreach (var projectReference in ProjectReferencesWithVersions)
				{
					var versionString = projectReference.GetMetadata("ProjectVersion");
					if (!SemanticVersion.TryParse(versionString, out var version)) {
						Log.LogError("'{0}' is not a valid semantic version", versionString);
						return false;
					}

					var range = version switch
					{
                        // No SemVer guarantees for pre-release (e.g. nightly) versions, so we use an exact version.
						{ IsPrerelease: true } => $"[{version}]",
						// We use Cargo's convention for 0.x versions i.e. minor = breaking, patch = feature or patch.
						{ Major: 0, Minor: var minor, Patch: var patch } => $"[0.{minor}.{patch}, 0.{minor + 1})",
						// 1.x versions follow regular SemVer rules.
						{ Major: var major, Minor: var minor, Patch: var patch } => $"[{major}.{minor}.{patch}, {major + 1})",
					};
					projectReference.SetMetadata("ProjectVersion", range);
				}

				ProjectReferencesWithExactVersions = ProjectReferencesWithVersions;
			]]></Code>
		</Task>
	</UsingTask>
	<!-- This workaround is based on comments in: https://github.com/NuGet/Home/issues/5556#issuecomment-753526765 -->
	<Target Name="_ExactProjectReferencesVersion" AfterTargets="_GetProjectReferenceVersions">
		<GenerateSemanticVersionRanges ProjectReferencesWithVersions="@(_ProjectReferencesWithVersions)">
			<Output ItemName="_ProjectReferencesWithExactVersions" TaskParameter="ProjectReferencesWithExactVersions" />
		</GenerateSemanticVersionRanges>
		<ItemGroup>
			<_ProjectReferencesWithVersions Remove="@(_ProjectReferencesWithVersions)" />
			<_ProjectReferencesWithVersions Include="@(_ProjectReferencesWithExactVersions)" />
		</ItemGroup>
	</Target>
</Project>