Rename our allwpilib (which is now 2020) to not have 2019 in the name

Change-Id: I3c07f85ed32ab8b97db765a9b43f2a6ce7da964a
diff --git a/buildSrc/src/main/groovy/SingleNativeBuild.groovy b/buildSrc/src/main/groovy/SingleNativeBuild.groovy
new file mode 100644
index 0000000..2b7e087
--- /dev/null
+++ b/buildSrc/src/main/groovy/SingleNativeBuild.groovy
@@ -0,0 +1,133 @@
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.gradle.api.GradleException;
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+import org.gradle.api.Task;
+import org.gradle.api.file.FileTree;
+import org.gradle.api.tasks.compile.JavaCompile;
+import org.gradle.language.base.internal.ProjectLayout;
+import org.gradle.language.base.plugins.ComponentModelBasePlugin;
+import org.gradle.language.nativeplatform.tasks.AbstractNativeSourceCompileTask;
+import org.gradle.model.ModelMap;
+import org.gradle.model.Mutate;
+import org.gradle.model.RuleSource;
+import org.gradle.model.Validate;
+import org.gradle.nativeplatform.NativeBinarySpec;
+import org.gradle.nativeplatform.NativeComponentSpec;
+import org.gradle.nativeplatform.NativeLibrarySpec;
+import org.gradle.nativeplatform.SharedLibraryBinarySpec;
+import org.gradle.nativeplatform.StaticLibraryBinarySpec;
+import org.gradle.nativeplatform.platform.internal.NativePlatformInternal;
+import org.gradle.nativeplatform.toolchain.NativeToolChain;
+import org.gradle.nativeplatform.toolchain.NativeToolChainRegistry;
+import org.gradle.nativeplatform.toolchain.internal.PlatformToolProvider;
+import org.gradle.nativeplatform.toolchain.internal.ToolType;
+import org.gradle.nativeplatform.toolchain.internal.gcc.AbstractGccCompatibleToolChain;
+import org.gradle.nativeplatform.toolchain.internal.msvcpp.VisualCppToolChain;
+import org.gradle.nativeplatform.toolchain.internal.tools.ToolRegistry;
+import org.gradle.platform.base.BinarySpec;
+import org.gradle.platform.base.ComponentSpec;
+import org.gradle.platform.base.ComponentSpecContainer;
+import org.gradle.platform.base.BinaryContainer;
+import org.gradle.platform.base.ComponentType;
+import org.gradle.platform.base.TypeBuilder;
+import org.gradle.nativeplatform.tasks.ObjectFilesToBinary;
+import groovy.transform.CompileStatic;
+import edu.wpi.first.nativeutils.tasks.ExportsGenerationTask
+
+@CompileStatic
+class SingleNativeBuild implements Plugin<Project> {
+    @CompileStatic
+    public void apply(Project project) {
+
+    }
+
+    @CompileStatic
+    static class Rules extends RuleSource {
+        @Mutate
+        @CompileStatic
+        void removeMacSystemIncludes(ModelMap<Task> tasks, BinaryContainer binaries) {
+            binaries.each {
+                if (!(it instanceof NativeBinarySpec)) {
+                    return
+                }
+                NativeBinarySpec nativeBin = (NativeBinarySpec)it
+                if (nativeBin.targetPlatform.operatingSystem.isMacOsX()) {
+                    nativeBin.tasks.withType(AbstractNativeSourceCompileTask) { AbstractNativeSourceCompileTask compileTask->
+                        compileTask.getSystemIncludes().setFrom()
+                    }
+                }
+            }
+        }
+
+        @Mutate
+        @CompileStatic
+        void setupSingleNativeBuild(ModelMap<Task> tasks, ComponentSpecContainer components, BinaryContainer binaryContainer, ProjectLayout projectLayout) {
+            Project project = (Project) projectLayout.projectIdentifier;
+
+            def nativeName = project.extensions.extraProperties.get('nativeName')
+
+            NativeLibrarySpec base = null
+            def subs = []
+            components.each { component ->
+                if (component.name == "${nativeName}Base") {
+                    base = (NativeLibrarySpec) component
+                } else if (component.name == "${nativeName}" || component.name == "${nativeName}JNI") {
+                    subs << component
+                }
+            }
+            subs.each {
+                ((NativeLibrarySpec) it).binaries.each { oBinary ->
+                    if (oBinary.buildable == false) {
+                        return
+                    }
+                    NativeBinarySpec binary = (NativeBinarySpec) oBinary
+                    NativeBinarySpec baseBin = null
+                    base.binaries.each { oTmpBaseBin ->
+                        if (oTmpBaseBin.buildable == false) {
+                            return
+                        }
+                        def tmpBaseBin = (NativeBinarySpec) oTmpBaseBin
+                        if (tmpBaseBin.targetPlatform.name == binary.targetPlatform.name &&
+                                tmpBaseBin.buildType == binary.buildType) {
+                            baseBin = tmpBaseBin
+                        }
+                    }
+                    baseBin.tasks.withType(AbstractNativeSourceCompileTask) { oCompileTask ->
+                        def compileTask = (AbstractNativeSourceCompileTask) oCompileTask
+                        if (binary instanceof SharedLibraryBinarySpec) {
+                            def sBinary = (SharedLibraryBinarySpec) binary
+                            ObjectFilesToBinary link = (ObjectFilesToBinary) sBinary.tasks.link
+                            ExportsGenerationTask exportsTask = binary.tasks.withType(ExportsGenerationTask)[0]
+                            if (exportsTask != null) {
+                                exportsTask.dependsOn compileTask
+                            }
+                            link.dependsOn compileTask
+                            link.inputs.dir compileTask.objectFileDir
+                            def tree = project.fileTree(compileTask.objectFileDir)
+                            tree.include '**/*.o'
+                            tree.include '**/*.obj'
+                            link.source tree
+                        } else if (binary instanceof StaticLibraryBinarySpec) {
+                            def sBinary = (StaticLibraryBinarySpec) binary
+                            ObjectFilesToBinary assemble = (ObjectFilesToBinary) sBinary.tasks.createStaticLib
+                            assemble.dependsOn compileTask
+                            assemble.inputs.dir compileTask.objectFileDir
+                            def tree = project.fileTree(compileTask.objectFileDir)
+                            tree.include '**/*.o'
+                            tree.include '**/*.obj'
+                            assemble.source tree
+                        }
+                    }
+                }
+            }
+        }
+    }
+}