Reduce size of pgmconfig package

pkg/pgmconfig/pgmconfig.go

@@ -0,0 +1,44 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package pgmconfig holds global constants for the kustomize tool.
+package pgmconfig
+
+// KustomizationFileNames is a list of filenames
+// that kustomize recognizes.
+// To avoid ambiguity, a directory cannot contain
+// more than one match to this list.
+func KustomizationFileNames() []string {
+	return []string{
+		KustomizationFileName0,
+		KustomizationFileName1,
+		KustomizationFileName2}
+}
+
+const (
+	KustomizationFileName0 = "kustomization.yaml"
+	KustomizationFileName1 = "kustomization.yml"
+	KustomizationFileName2 = "Kustomization"
+
+	// An environment variable to consult for kustomization
+	// configuration data.  See:
+	// https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
+	XdgConfigHome = "XDG_CONFIG_HOME"
+
+	// Use this when XdgConfigHome not defined.
+	DefaultConfigSubdir = ".config"
+
+	// Program name, for help, finding the XDG_CONFIG_DIR, etc.
+	ProgramName = "kustomize"
+
+	// Domain from which kustomize code is imported, for locating
+	// plugin source code under $GOPATH.
+	// TODO: move to pgk/plugin/config.go or equivalent
+	// as part of v4 release.  Cannot move till then
+	// because of pluginator dependence at v3.
+	DomainName = "sigs.k8s.io"
+
+	// Name of directory housing all plugins.
+	// TODO: move to pgk/plugin/config.go or equivalent
+	PluginRoot = "plugin"
+)