initial push with clean and rebuild commands

engine/compile.go

@@ -0,0 +1,50 @@
+package engine
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+
+	"golang.org/x/sys/windows/registry"
+)
+
+func findUnrealVersionPath(version string) (string, error) {
+	//Attempting to build project files programattically
+	k, err := registry.OpenKey(registry.LOCAL_MACHINE, `SOFTWARE\EpicGames\Unreal Engine\`+version, registry.QUERY_VALUE)
+	if err != nil {
+		return "", err
+	}
+	defer k.Close()
+	s, _, err := k.GetStringValue("InstalledDirectory") //Pulling the (Default) value which has the path
+	if err != nil {
+		return "", err
+	}
+	return s, nil
+}
+
+func buildProject(version string, projectABSPath string) error {
+	unrealVersionPath, err := findUnrealVersionPath(version)
+	if err != nil {
+		fmt.Printf("Unable to find the path to Unreal Engine version %s, please build project files manually: %s ", version, err)
+		bufio.NewReader(os.Stdin).ReadBytes('\n')
+		os.Exit(1)
+	}
+	unrealVersionPath = unrealVersionPath + string(filepath.Separator) + "Engine" + string(filepath.Separator) + "Build" + string(filepath.Separator) + "BatchFiles" + string(filepath.Separator) + "Build.bat"
+	checkPath(unrealVersionPath) // Verifying path, will exit if fail
+	fmt.Println("Using Unreal Engine Path: ", unrealVersionPath)
+	// Manually building up the commmand
+	buildArgs := []string{"Development", "Win64", "-Project=" + projectABSPath, "-TargetType=Editor", "-Progress", "-NoEngineChanges", "-NoHotReloadFromIDE"}
+	buildFilesCMD := exec.Command(unrealVersionPath, buildArgs...)
+	// Making sure we write the output of the command to the command prompt
+	out := io.Writer(os.Stdout)
+	buildFilesCMD.Stdout = out
+	// finally running the command
+	err = buildFilesCMD.Run()
+	if err != nil {
+		return err
+	}
+	return nil
+}