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completion.go 6.66 KB
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/*
Copyright 2014 The Kubernetes Authors All rights reserved.
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"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
)
const (
completion_long = `Output shell completion code for the given shell (bash or zsh).
This command prints shell code which must be evaluation to provide interactive
completion of kubectl commands.
`
completion_example = `
$ source <(kubectl completion bash)
will load the kubectl completion code for bash. Note that this depends on the bash-completion
framework. It must be sourced before sourcing the kubectl completion, i.e. on the Mac:
$ brew install bash-completion
$ source $(brew --prefix)/etc/bash_completion
$ source <(kubectl completion bash)
If you use zsh, the following will load kubectl zsh completion:
$ source <(kubectl completion zsh)
`
)
var (
completion_shells = map[string]func(out io.Writer, cmd *cobra.Command) error{
"bash": runCompletionBash,
"zsh": runCompletionZsh,
}
)
func NewCmdCompletion(f *cmdutil.Factory, out io.Writer) *cobra.Command {
shells := []string{}
for s := range completion_shells {
shells = append(shells, s)
}
cmd := &cobra.Command{
Use: "completion SHELL",
Short: "Output shell completion code for the given shell (bash or zsh)",
Long: completion_long,
Example: completion_example,
Run: func(cmd *cobra.Command, args []string) {
err := RunCompletion(f, out, cmd, args)
cmdutil.CheckErr(err)
},
ValidArgs: shells,
}
return cmd
}
func RunCompletion(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string) error {
if len(args) == 0 {
return cmdutil.UsageError(cmd, "Shell not specified.")
}
if len(args) > 1 {
return cmdutil.UsageError(cmd, "Too many arguments. Expected only the shell type.")
}
run, found := completion_shells[args[0]]
if !found {
return cmdutil.UsageError(cmd, "Unsupported shell type %q.", args[0])
}
return run(out, cmd.Parent())
}
func runCompletionBash(out io.Writer, kubectl *cobra.Command) error {
return kubectl.GenBashCompletion(out)
}
func runCompletionZsh(out io.Writer, kubectl *cobra.Command) error {
zsh_initialilzation := `# Copyright 2016 The Kubernetes Authors All rights reserved.
#
# 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.
__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_declare() {
if [ "$1" == "-F" ]; then
whence -w "$@"
else
builtin declare "$@"
fi
}
__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 compinit && compinit
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_bash_source <(sed \
-e 's/declare -F/whence -w/' \
-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}/__kubectl_declare/g" \
-e "s/\\\$(type${RWORD}/\$(__kubectl_type/g" \
<<'BASH_COMPLETION_EOF'
`
out.Write([]byte(zsh_initialilzation))
buf := new(bytes.Buffer)
kubectl.GenBashCompletion(buf)
out.Write(buf.Bytes())
zsh_tail := `
BASH_COMPLETION_EOF
)
`
out.Write([]byte(zsh_tail))
return nil
}
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