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completion.go
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completion.go
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/*
Copyright The Helm 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 main
import (
"bytes"
"fmt"
"io"
"github.com/spf13/cobra"
)
const completionDesc = `
Generate autocompletions script for Helm for the specified shell (bash or zsh).
This command can generate shell autocompletions. e.g.
$ helm completion bash
Can be sourced as such
$ source <(helm completion bash)
`
var (
completionShells = map[string]func(out io.Writer, cmd *cobra.Command) error{
"bash": runCompletionBash,
"zsh": runCompletionZsh,
}
)
func newCompletionCmd(out io.Writer) *cobra.Command {
shells := []string{}
for s := range completionShells {
shells = append(shells, s)
}
cmd := &cobra.Command{
Use: "completion SHELL",
Short: "Generate autocompletions script for the specified shell (bash or zsh)",
Long: completionDesc,
RunE: func(cmd *cobra.Command, args []string) error {
return runCompletion(out, cmd, args)
},
ValidArgs: shells,
}
return cmd
}
func runCompletion(out io.Writer, cmd *cobra.Command, args []string) error {
if len(args) == 0 {
return fmt.Errorf("shell not specified")
}
if len(args) > 1 {
return fmt.Errorf("too many arguments, expected only the shell type")
}
run, found := completionShells[args[0]]
if !found {
return fmt.Errorf("unsupported shell type %q", args[0])
}
return run(out, cmd)
}
func runCompletionBash(out io.Writer, cmd *cobra.Command) error {
return cmd.Root().GenBashCompletion(out)
}
func runCompletionZsh(out io.Writer, cmd *cobra.Command) error {
zshInitialization := `#compdef helm
__helm_bash_source() {
alias shopt=':'
alias _expand=_bash_expand
alias _complete=_bash_comp
emulate -L sh
setopt kshglob noshglob braceexpand
source "$@"
}
__helm_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 [ "$1" = "__helm_compopt" ]; then
echo builtin
return 0
fi
fi
type "$@"
}
__helm_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
}
__helm_compopt() {
true # don't do anything. Not supported by bashcompinit in zsh
}
__helm_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]#"$colon_word"}
done
fi
}
__helm_get_comp_words_by_ref() {
cur="${COMP_WORDS[COMP_CWORD]}"
prev="${COMP_WORDS[${COMP_CWORD}-1]}"
words=("${COMP_WORDS[@]}")
cword=("${COMP_CWORD[@]}")
}
__helm_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}\" = *.$1 || -d \"\${w}\" ]]"; then
qw="$(__helm_quote "${w}")"
if [ -d "${w}" ]; then
COMPREPLY+=("${qw}/")
else
COMPREPLY+=("${qw}")
fi
fi
done
}
__helm_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\|BusyBox'; then
LWORD='\<'
RWORD='\>'
fi
__helm_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}/__helm_filedir/g" \
-e "s/${LWORD}_get_comp_words_by_ref${RWORD}/__helm_get_comp_words_by_ref/g" \
-e "s/${LWORD}__ltrim_colon_completions${RWORD}/__helm_ltrim_colon_completions/g" \
-e "s/${LWORD}compgen${RWORD}/__helm_compgen/g" \
-e "s/${LWORD}compopt${RWORD}/__helm_compopt/g" \
-e "s/${LWORD}declare${RWORD}/builtin declare/g" \
-e "s/\\\$(type${RWORD}/\$(__helm_type/g" \
-e 's/aliashash\["\(.\{1,\}\)"\]/aliashash[\1]/g' \
-e 's/FUNCNAME/funcstack/g' \
<<'BASH_COMPLETION_EOF'
`
out.Write([]byte(zshInitialization))
buf := new(bytes.Buffer)
cmd.Root().GenBashCompletion(buf)
out.Write(buf.Bytes())
zshTail := `
BASH_COMPLETION_EOF
}
__helm_bash_source <(__helm_convert_bash_to_zsh)
`
out.Write([]byte(zshTail))
return nil
}