Vezel.Zig.Sdk.Editor.targets

<Project>
    <PropertyGroup>
        <_CommandFragmentsPath>$(IntermediateOutputPath)cdb</_CommandFragmentsPath>
    </PropertyGroup>

    <!--
    The inputs here are very important: Because generating compile_commands.json
    is a fairly expensive operation (see the comment about the Zig cache below),
    we only want to do so when the set of source files has actually changed.
    Fortunately, MSBuild's _GenerateCompileDependencyCache target has us covered
    by generating a file containing a hash of all Compile items. This file is
    only written when the resulting hash is different, so we can use it as an
    input here.
    -->
    <Target Name="_CheckCompileCommands"
            Inputs="$(MSBuildAllProjects); $(IntermediateOutputPath)$(MSBuildProjectFile).CoreCompileInputs.cache"
            Outputs="$(CommandsPath)"
            Condition="'$(Language)' != 'Zig' and '$(EditorSupport)' == 'true'">
        <CreateProperty Value="true">
            <Output TaskParameter="ValueSetByTask"
                    PropertyName="_RefreshCompileCommands" />
        </CreateProperty>
    </Target>

    <Target Name="_PrepareCompileCommands"
            Condition="'$(_RefreshCompileCommands)' == 'true'">
        <RemoveDir Directories="$(_CommandFragmentsPath)"
                   Condition="Exists('$(_CommandFragmentsPath)')" />
        <MakeDir Directories="$(_CommandFragmentsPath)" />

        <!--
        The Zig compiler will not emit a new compilation database fragment for a
        given source file if it has not actually changed. This unfortunately
        means that we have to clean the entire Zig cache when we need to refresh
        compile_commands.json. Fun.
        -->
        <RemoveDir Directories="$(CachePath)"
                   Condition="Exists('$(CachePath)')" />
    </Target>

    <!--
    Read in all the compilation database fragments, remove the trailing comma
    from each, join them into a valid JSON array, and finally write the
    compile_commands.json file.
    -->
    <Target Name="_GatherCompileCommands"
            Condition="'$(_RefreshCompileCommands)' == 'true'">
        <ItemGroup>
            <_CdbFragments Include="$(_CommandFragmentsPath)/*.json" />
            <_CdbFragments Update="@(_CdbFragments)"
                           Json="$([System.IO.File]::ReadAllText('%(FullPath)').Trim().TrimEnd(','))" />
        </ItemGroup>

        <PropertyGroup>
            <_CompileCommands>
                <![CDATA[
[ @(_CdbFragments->'%(Json)', ', ') ]
                ]]>
            </_CompileCommands>
        </PropertyGroup>

        <WriteLinesToFile File="$(CommandsPath)"
                          Lines="$(_CompileCommands)"
                          Overwrite="true" />
    </Target>
</Project>