refactor cmd/config to internal

cmd/config/internal/commands/merge.go

@@ -0,0 +1,68 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package commands
+
+import (
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/cmd/config/internal/generateddocs/commands"
+	"sigs.k8s.io/kustomize/kyaml/kio"
+	"sigs.k8s.io/kustomize/kyaml/kio/filters"
+)
+
+func GetMergeRunner(name string) *MergeRunner {
+	r := &MergeRunner{}
+	c := &cobra.Command{
+		Use:     "merge [SOURCE_DIR...] [DESTINATION_DIR]",
+		Short:   commands.MergeShort,
+		Long:    commands.MergeLong,
+		Example: commands.MergeExamples,
+		RunE:    r.runE,
+	}
+	fixDocs(name, c)
+	r.Command = c
+	r.Command.Flags().BoolVar(&r.InvertOrder, "invert-order", false,
+		"if true, merge Resources in the reverse order")
+	return r
+}
+
+func MergeCommand(name string) *cobra.Command {
+	return GetMergeRunner(name).Command
+}
+
+// MergeRunner contains the run function
+type MergeRunner struct {
+	Command     *cobra.Command
+	InvertOrder bool
+}
+
+func (r *MergeRunner) runE(c *cobra.Command, args []string) error {
+	var inputs []kio.Reader
+	// add the packages in reverse order -- the arg list should be highest precedence first
+	// e.g. merge from -> to, but the MergeFilter is highest precedence last
+	for i := len(args) - 1; i >= 0; i-- {
+		inputs = append(inputs, kio.LocalPackageReader{PackagePath: args[i]})
+	}
+	// if there is no "from" package, read from stdin
+	rw := &kio.ByteReadWriter{
+		Reader:                c.InOrStdin(),
+		Writer:                c.OutOrStdout(),
+		KeepReaderAnnotations: true,
+	}
+	if len(inputs) < 2 {
+		inputs = append(inputs, rw)
+	}
+
+	// write to the "to" package if specified
+	var outputs []kio.Writer
+	if len(args) != 0 {
+		outputs = append(outputs, kio.LocalPackageWriter{PackagePath: args[len(args)-1]})
+	}
+	// if there is no "to" package, write to stdout
+	if len(outputs) == 0 {
+		outputs = append(outputs, rw)
+	}
+
+	filters := []kio.Filter{filters.MergeFilter{}, filters.FormatFilter{}}
+	return handleError(c, kio.Pipeline{Inputs: inputs, Filters: filters, Outputs: outputs}.Execute())
+}