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completion.go
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completion.go
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// Copyright 2020 The Lokomotive 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 (
"fmt"
"io"
"os"
"github.com/spf13/cobra"
)
const completionDesc = `
Generate autocompletion script for lokoctl for the specified shell (bash or zsh).
`
const completionExample = ` # Load the lokoctl completion code for bash into the current shell.
source <(lokoctl completion bash)
# Load the lokoctl completion code for zsh into the current shell.
source <(lokoctl completion zsh)
# Generate Bash completion file and load it for every shell.
lokoctl completion zsh > ~/.bash_lokoctl_completion
echo "source ~/.bash_lokoctl_completion" >> ~/.bashrc && source ~/.bashrc
# Set the lokoctl completion code for zsh to autoload on startup.
lokoctl completion zsh > "${fpath[1]}/_lokoctl" && exec $SHELL`
const bashCompDesc = ` # If running Bash 3.2 that is included with macOS, install bash completion using homebrew.
brew install bash-completion
# If running Bash 4.1+ on macOS, install bash completion using homebrew.
brew install bash-completion@2
# Load the lokoctl completion code for bash into the current shell.
source <(lokoctl completion bash)
# Generate Bash completion file and load it for every shell.
lokoctl completion zsh > ~/.bash_lokoctl_completion
echo "source ~/.bash_lokoctl_completion" >> ~/.bashrc && source ~/.bashrc
`
const zshCompDesc = ` # Generate the autocompletion script for lokoctl for the zsh shell.
# Load the lokoctl completion code for zsh into the current shell.
source <(lokoctl completion zsh)
# Set the lokoctl completion code for zsh to autoload on startup.
lokoctl completion zsh > "${fpath[1]}/_lokoctl" && exec $SHELL
`
const zshInitialization = `#compdef lokoctl
__lokoctl_bash_source() {
alias shopt=':'
alias _expand=_bash_expand
alias _complete=_bash_comp
emulate -L sh
setopt kshglob noshglob braceexpand
source "$@"
}
__lokoctl_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 [ "$1" = "__lokoctl_compopt" ]; then
echo builtin
return 0
fi
fi
type "$@"
}
__lokoctl_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}" = "$1"* ]]; then
# Use printf instead of echo because it is possible that
# the value to print is -n, which would be interpreted
# as a flag to echo
printf "%s\n" "${w}"
fi
done
}
__lokoctl_compopt() {
true # don't do anything. Not supported by bashcompinit in zsh
}
__lokoctl_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]#"$colon_word"}
done
fi
}
__lokoctl_get_comp_words_by_ref() {
cur="${COMP_WORDS[COMP_CWORD]}"
prev="${COMP_WORDS[${COMP_CWORD}-1]}"
words=("${COMP_WORDS[@]}")
cword=("${COMP_CWORD[@]}")
}
__lokoctl_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}\" = *.$1 || -d \"\${w}\" ]]"; then
qw="$(__lokoctl_quote "${w}")"
if [ -d "${w}" ]; then
COMPREPLY+=("${qw}/")
else
COMPREPLY+=("${qw}")
fi
fi
done
}
__lokoctl_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
__lokoctl_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}/__lokoctl_filedir/g" \
-e "s/${LWORD}_get_comp_words_by_ref${RWORD}/__lokoctl_get_comp_words_by_ref/g" \
-e "s/${LWORD}__ltrim_colon_completions${RWORD}/__lokoctl_ltrim_colon_completions/g" \
-e "s/${LWORD}compgen${RWORD}/__lokoctl_compgen/g" \
-e "s/${LWORD}compopt${RWORD}/__lokoctl_compopt/g" \
-e "s/${LWORD}declare${RWORD}/builtin declare/g" \
-e "s/\\\$(type${RWORD}/\$(__lokoctl_type/g" \
-e 's/aliashash\["\(.\{1,\}\)"\]/aliashash[\1]/g' \
-e 's/FUNCNAME/funcstack/g' \
<<'BASH_COMPLETION_EOF'
`
const zshTail = `
BASH_COMPLETION_EOF
}
__lokoctl_bash_source <(__lokoctl_convert_bash_to_zsh)
`
func newCompletionCmd(out io.Writer) *cobra.Command {
cmd := &cobra.Command{
Use: "completion",
Short: "Generate autocompletion script for the specified shell",
Long: completionDesc,
Example: completionExample,
Args: noArgs,
ValidArgsFunction: noCompletions, // Disable file completion.
}
bash := &cobra.Command{
Use: "bash",
Short: "Generate autocompletion script for bash",
Long: bashCompDesc,
Args: noArgs,
DisableFlagsInUseLine: true,
ValidArgsFunction: noCompletions,
RunE: func(cmd *cobra.Command, args []string) error {
return runCompletionBash(out, cmd)
},
}
zsh := &cobra.Command{
Use: "zsh",
Short: "Generate autocompletion script for zsh",
Long: zshCompDesc,
Args: noArgs,
DisableFlagsInUseLine: true,
ValidArgsFunction: noCompletions,
RunE: func(cmd *cobra.Command, args []string) error {
return runCompletionZsh(out, cmd)
},
}
cmd.AddCommand(bash, zsh)
return cmd
}
func runCompletionBash(out io.Writer, cmd *cobra.Command) error {
return cmd.Root().GenBashCompletion(out)
}
func runCompletionZsh(out io.Writer, cmd *cobra.Command) error {
if _, err := out.Write([]byte(zshInitialization)); err != nil {
return fmt.Errorf("writing zsh initialization: %w", err)
}
if err := runCompletionBash(out, cmd); err != nil {
return fmt.Errorf("running bash completion: %w", err)
}
if _, err := out.Write([]byte(zshTail)); err != nil {
return fmt.Errorf("writing zsh tail: %w", err)
}
return nil
}
// noCompletions is used to disable file completion.
func noCompletions(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
return nil, cobra.ShellCompDirectiveNoFileComp
}
// noArgs returns an error if any args are included.
func noArgs(cmd *cobra.Command, args []string) error {
if len(args) > 0 {
return fmt.Errorf(
"%q accepts no arguments\n\nUsage: %s",
cmd.CommandPath(),
cmd.UseLine(),
)
}
return nil
}
func init() { //nolint:gochecknoinits
RootCmd.AddCommand(newCompletionCmd(os.Stdout))
}