func getExec()

in commands/action.go [595:673]
70 lines of code
25 McCabe index (conditional complexity)

func getExec(args []string, params ActionFlags) (*whisk.Exec, error) {
	var err error
	var code string
	var exec *whisk.Exec

	exec = new(whisk.Exec)
	kind := params.kind
	isNative := params.native
	docker := params.docker
	mainEntry := params.main
	ext := ""

	if len(args) == 2 {
		artifact := args[1]
		ext = filepath.Ext(artifact)
		code, err = ReadFile(artifact)

		if err != nil {
			whisk.Debug(whisk.DbgError, "ReadFile(%s) error: %s\n", artifact, err)
			return nil, err
		}

		if ext == ZIP_EXT || ext == JAVA_EXT || ext == BAL_BIN_EXT {
			code = base64.StdEncoding.EncodeToString([]byte(code))
		}

		exec.Code = &code
	} else if len(args) == 1 && len(docker) == 0 {
		return nil, noArtifactError()
	} else if len(args) > 1 {
		return nil, noArtifactError()
	}

	if len(kind) > 0 {
		exec.Kind = kind
	} else if len(docker) > 0 || isNative {
		exec.Kind = BLACKBOX
		if isNative {
			exec.Image = "openwhisk/dockerskeleton"
		} else {
			exec.Image = docker
		}
	} else if ext == SWIFT_EXT {
		exec.Kind = fmt.Sprintf("%s:%s", SWIFT, DEFAULT)
	} else if ext == NODE_JS_EXT {
		exec.Kind = fmt.Sprintf("%s:%s", NODE_JS, DEFAULT)
	} else if ext == PYTHON_EXT {
		exec.Kind = fmt.Sprintf("%s:%s", PYTHON, DEFAULT)
	} else if ext == JAVA_EXT {
		exec.Kind = fmt.Sprintf("%s:%s", JAVA, DEFAULT)
	} else if ext == PHP_EXT {
		exec.Kind = fmt.Sprintf("%s:%s", PHP, DEFAULT)
	} else if ext == RUBY_EXT {
		exec.Kind = fmt.Sprintf("%s:%s", RUBY, DEFAULT)
	} else if ext == RUST_EXT {
		exec.Kind = fmt.Sprintf("%s:%s", RUST, DEFAULT)
	} else if ext == GO_EXT {
		exec.Kind = fmt.Sprintf("%s:%s", GO, DEFAULT)
	} else if ext == BAL_BIN_EXT {
		exec.Kind = fmt.Sprintf("%s:%s", BAL, DEFAULT)
	} else {
		if ext == ZIP_EXT {
			return nil, zipKindError()
		} else {
			return nil, extensionError(ext)
		}
	}

	// Error if entry point is not specified for Java
	if len(mainEntry) != 0 {
		exec.Main = mainEntry
	} else {
		if exec.Kind == "java" {
			return nil, javaEntryError()
		}
	}

	return exec, nil
}