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bash.go
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bash.go
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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package completion
import (
"bytes"
"fmt"
"strings"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
// bashCompletionFuncName gets the name of a bash completion func for the given
// type.
func bashCompletionFuncName(k8sType string) string {
return fmt.Sprintf("__kf_name_%s", k8sType)
}
// bashCompletionFunc returns the bash completion function for a single type.
func bashCompletionFunc(k8sType string) string {
return bashCompletionFuncName(k8sType) + `()
{
local out
if out=$(kf names ` + k8sType + ` 2>/dev/null); then
COMPREPLY=( $( compgen -W "${out[*]}" -- "$cur" ) )
fi
}
`
}
// MarkFlagCompletionSupported adds a completion annotation to a flag.
func MarkFlagCompletionSupported(flags *pflag.FlagSet, name, k8sType string) error {
return flags.SetAnnotation(name, cobra.BashCompCustom, []string{bashCompletionFuncName(k8sType)})
}
// MarkArgCompletionSupported returns completion annotations for a CobraCommand
func MarkArgCompletionSupported(cmd *cobra.Command, k8sType string) {
if cmd == nil {
return
}
if cmd.Annotations == nil {
cmd.Annotations = make(map[string]string)
}
cmd.Annotations[cobra.BashCompCustom] = bashCompletionFuncName(k8sType)
}
func customCompletions(cmd *cobra.Command) map[string]string {
out := make(map[string]string)
if customFunc, ok := cmd.Annotations[cobra.BashCompCustom]; ok {
// Copied from Cobra's path to bash generator
commandName := cmd.CommandPath()
commandName = strings.Replace(commandName, " ", "_", -1)
commandName = strings.Replace(commandName, ":", "__", -1)
out[commandName] = customFunc
}
for _, c := range cmd.Commands() {
childrenCompletions := customCompletions(c)
for k, v := range childrenCompletions {
out[k] = v
}
}
return out
}
// AddBashCompletion adds bash completion to the given Cobra command.
func AddBashCompletion(rootCommand *cobra.Command) {
out := &bytes.Buffer{}
for _, k8sType := range KnownGenericTypes() {
fmt.Fprintln(out, bashCompletionFunc(k8sType))
}
fmt.Fprintln(out)
fmt.Fprintln(out, "__kf_custom_func() {")
fmt.Fprintln(out, " case ${last_command} in")
for commandName, completionFunc := range customCompletions(rootCommand) {
fmt.Fprintf(out, " %s)\n", commandName)
fmt.Fprintf(out, " %s\n", completionFunc)
fmt.Fprintln(out, " return")
fmt.Fprintln(out, " ;;")
fmt.Fprintln(out)
}
fmt.Fprintln(out, " *)")
fmt.Fprintln(out, " ;;")
fmt.Fprintln(out, " esac")
fmt.Fprintln(out, "}")
fmt.Fprintln(out)
rootCommand.BashCompletionFunction = out.String()
}