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completion.go
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completion.go
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/*
Copyright 2016 The Kubernetes Authors.
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
http://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 cmd
import (
"bytes"
"io"
"github.com/spf13/cobra"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
)
const defaultBoilerPlate = `
# Copyright 2016 The Kubernetes Authors.
#
# 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
#
# http://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.
`
var (
completion_long = templates.LongDesc(i18n.T(`
Output shell completion code for the specified shell (bash or zsh).
The shell code must be evalutated to provide interactive
completion of kubectl commands. This can be done by sourcing it from
the .bash_profile.
Detailed instructions on how to do this are available here:
https://kubernetes.io/docs/tasks/tools/install-kubectl/#enabling-shell-autocompletion
Note for zsh users: [1] zsh completions are only supported in versions of zsh >= 5.2`))
completion_example = templates.Examples(i18n.T(`
# Installing bash completion on macOS using homebrew
## If running Bash 3.2 included with macOS
brew install bash-completion
## or, if running Bash 4.1+
brew install bash-completion@2
## If kubectl is installed via homebrew, this should start working immediately.
## If you've installed via other means, you may need add the completion to your completion directory
kubectl completion bash > $(brew --prefix)/etc/bash_completion.d/kubectl
# Installing bash completion on Linux
## Load the kubectl completion code for bash into the current shell
source <(kubectl completion bash)
## Write bash completion code to a file and source if from .bash_profile
kubectl completion bash > ~/.kube/completion.bash.inc
printf "
# Kubectl shell completion
source '$HOME/.kube/completion.bash.inc'
" >> $HOME/.bash_profile
source $HOME/.bash_profile
# Load the kubectl completion code for zsh[1] into the current shell
source <(kubectl completion zsh)
# Set the kubectl completion code for zsh[1] to autoload on startup
kubectl completion zsh > "${fpath[1]}/_kubectl"`))
)
var (
completion_shells = map[string]func(out io.Writer, boilerPlate string, cmd *cobra.Command) error{
"bash": runCompletionBash,
"zsh": runCompletionZsh,
}
)
func NewCmdCompletion(out io.Writer, boilerPlate string) *cobra.Command {
shells := []string{}
for s := range completion_shells {
shells = append(shells, s)
}
cmd := &cobra.Command{
Use: "completion SHELL",
Short: i18n.T("Output shell completion code for the specified shell (bash or zsh)"),
Long: completion_long,
Example: completion_example,
Run: func(cmd *cobra.Command, args []string) {
err := RunCompletion(out, boilerPlate, cmd, args)
cmdutil.CheckErr(err)
},
ValidArgs: shells,
}
return cmd
}
func RunCompletion(out io.Writer, boilerPlate string, cmd *cobra.Command, args []string) error {
if len(args) == 0 {
return cmdutil.UsageErrorf(cmd, "Shell not specified.")
}
if len(args) > 1 {
return cmdutil.UsageErrorf(cmd, "Too many arguments. Expected only the shell type.")
}
run, found := completion_shells[args[0]]
if !found {
return cmdutil.UsageErrorf(cmd, "Unsupported shell type %q.", args[0])
}
return run(out, boilerPlate, cmd.Parent())
}
func runCompletionBash(out io.Writer, boilerPlate string, kubectl *cobra.Command) error {
if len(boilerPlate) == 0 {
boilerPlate = defaultBoilerPlate
}
if _, err := out.Write([]byte(boilerPlate)); err != nil {
return err
}
return kubectl.GenBashCompletion(out)
}
func runCompletionZsh(out io.Writer, boilerPlate string, kubectl *cobra.Command) error {
zsh_head := "#compdef kubectl\n"
out.Write([]byte(zsh_head))
if len(boilerPlate) == 0 {
boilerPlate = defaultBoilerPlate
}
if _, err := out.Write([]byte(boilerPlate)); err != nil {
return err
}
zsh_initialization := `
__kubectl_bash_source() {
alias shopt=':'
alias _expand=_bash_expand
alias _complete=_bash_comp
emulate -L sh
setopt kshglob noshglob braceexpand
source "$@"
}
__kubectl_type() {
# -t is not supported by zsh
if [ "$1" == "-t" ]; then
shift
# fake Bash 4 to disable "complete -o nospace". Instead
# "compopt +-o nospace" is used in the code to toggle trailing
# spaces. We don't support that, but leave trailing spaces on
# all the time
if [ "$1" = "__kubectl_compopt" ]; then
echo builtin
return 0
fi
fi
type "$@"
}
__kubectl_compgen() {
local completions w
completions=( $(compgen "$@") ) || return $?
# filter by given word as prefix
while [[ "$1" = -* && "$1" != -- ]]; do
shift
shift
done
if [[ "$1" == -- ]]; then
shift
fi
for w in "${completions[@]}"; do
if [[ "${w}" = "$1"* ]]; then
echo "${w}"
fi
done
}
__kubectl_compopt() {
true # don't do anything. Not supported by bashcompinit in zsh
}
__kubectl_ltrim_colon_completions()
{
if [[ "$1" == *:* && "$COMP_WORDBREAKS" == *:* ]]; then
# Remove colon-word prefix from COMPREPLY items
local colon_word=${1%${1##*:}}
local i=${#COMPREPLY[*]}
while [[ $((--i)) -ge 0 ]]; do
COMPREPLY[$i]=${COMPREPLY[$i]#"$colon_word"}
done
fi
}
__kubectl_get_comp_words_by_ref() {
cur="${COMP_WORDS[COMP_CWORD]}"
prev="${COMP_WORDS[${COMP_CWORD}-1]}"
words=("${COMP_WORDS[@]}")
cword=("${COMP_CWORD[@]}")
}
__kubectl_filedir() {
local RET OLD_IFS w qw
__debug "_filedir $@ cur=$cur"
if [[ "$1" = \~* ]]; then
# somehow does not work. Maybe, zsh does not call this at all
eval echo "$1"
return 0
fi
OLD_IFS="$IFS"
IFS=$'\n'
if [ "$1" = "-d" ]; then
shift
RET=( $(compgen -d) )
else
RET=( $(compgen -f) )
fi
IFS="$OLD_IFS"
IFS="," __debug "RET=${RET[@]} len=${#RET[@]}"
for w in ${RET[@]}; do
if [[ ! "${w}" = "${cur}"* ]]; then
continue
fi
if eval "[[ \"\${w}\" = *.$1 || -d \"\${w}\" ]]"; then
qw="$(__kubectl_quote "${w}")"
if [ -d "${w}" ]; then
COMPREPLY+=("${qw}/")
else
COMPREPLY+=("${qw}")
fi
fi
done
}
__kubectl_quote() {
if [[ $1 == \'* || $1 == \"* ]]; then
# Leave out first character
printf %q "${1:1}"
else
printf %q "$1"
fi
}
autoload -U +X bashcompinit && bashcompinit
# use word boundary patterns for BSD or GNU sed
LWORD='[[:<:]]'
RWORD='[[:>:]]'
if sed --help 2>&1 | grep -q GNU; then
LWORD='\<'
RWORD='\>'
fi
__kubectl_convert_bash_to_zsh() {
sed \
-e 's/declare -F/whence -w/' \
-e 's/_get_comp_words_by_ref "\$@"/_get_comp_words_by_ref "\$*"/' \
-e 's/local \([a-zA-Z0-9_]*\)=/local \1; \1=/' \
-e 's/flags+=("\(--.*\)=")/flags+=("\1"); two_word_flags+=("\1")/' \
-e 's/must_have_one_flag+=("\(--.*\)=")/must_have_one_flag+=("\1")/' \
-e "s/${LWORD}_filedir${RWORD}/__kubectl_filedir/g" \
-e "s/${LWORD}_get_comp_words_by_ref${RWORD}/__kubectl_get_comp_words_by_ref/g" \
-e "s/${LWORD}__ltrim_colon_completions${RWORD}/__kubectl_ltrim_colon_completions/g" \
-e "s/${LWORD}compgen${RWORD}/__kubectl_compgen/g" \
-e "s/${LWORD}compopt${RWORD}/__kubectl_compopt/g" \
-e "s/${LWORD}declare${RWORD}/builtin declare/g" \
-e "s/\\\$(type${RWORD}/\$(__kubectl_type/g" \
<<'BASH_COMPLETION_EOF'
`
out.Write([]byte(zsh_initialization))
buf := new(bytes.Buffer)
kubectl.GenBashCompletion(buf)
out.Write(buf.Bytes())
zsh_tail := `
BASH_COMPLETION_EOF
}
__kubectl_bash_source <(__kubectl_convert_bash_to_zsh)
_complete kubectl 2>/dev/null
`
out.Write([]byte(zsh_tail))
return nil
}