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completion.go
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completion.go
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// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"bytes"
"io"
"os"
"path"
"github.com/pingcap/errors"
"github.com/spf13/cobra"
)
func newCompletionCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "completion SHELL",
Short: "Output shell completion code for the specified shell (bash or zsh)",
Example: ` # 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
# Installing bash completion on Linux
## If bash-completion is not installed on Linux, please install the 'bash-completion' package
## via your distribution's package manager.
## Load the tiup completion code for bash into the current shell
source <(tiup completion bash)
## Write bash completion code to a file and source if from .bash_profile
tiup completion bash > ~/.tiup.completion.bash
printf "
# tiup shell completion
source '$HOME/.tiup.completion.bash'
" >> $HOME/.bash_profile
source $HOME/.bash_profile
# Load the tiup completion code for zsh[1] into the current shell
source <(tiup completion zsh)
# Set the tiup completion code for zsh[1] to autoload on startup
tiup completion zsh > "${fpath[1]}/_tiup"`,
SilenceUsage: true,
SilenceErrors: true,
RunE: func(cmd *cobra.Command, args []string) error {
teleCommand = cmd.CommandPath()
shell := os.Getenv("SHELL")
if len(args) == 1 {
shell = args[0]
}
shell = path.Base(shell)
switch shell {
case "bash":
return cmd.Parent().GenBashCompletion(os.Stdout)
case "zsh":
return genCompletionZsh(os.Stdout, cmd.Parent())
default:
return errors.New("unsupported shell type " + shell)
}
},
}
return cmd
}
// Followed the trick https://github.com/kubernetes/kubectl/blob/master/pkg/cmd/completion/completion.go#L145.
func genCompletionZsh(out io.Writer, tiup *cobra.Command) error {
zshHead := "#compdef tiup\n"
_, _ = out.Write([]byte(zshHead))
zshInitialization := `
__tiup_bash_source() {
alias shopt=':'
emulate -L sh
setopt kshglob noshglob braceexpand
source "$@"
}
__tiup_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 [ "$1" = "__tiup_compopt" ]; then
echo builtin
return 0
fi
fi
type "$@"
}
__tiup_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
}
__tiup_compopt() {
true # don't do anything. Not supported by bashcompinit in zsh
}
__tiup_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]#"$colon_word"}
done
fi
}
__tiup_get_comp_words_by_ref() {
cur="${COMP_WORDS[COMP_CWORD]}"
prev="${COMP_WORDS[${COMP_CWORD}-1]}"
words=("${COMP_WORDS[@]}")
cword=("${COMP_CWORD[@]}")
}
__tiup_filedir() {
# Don't need to do anything here.
# Otherwise we will get trailing space without "compopt -o nospace"
true
}
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
__tiup_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}/__tiup_filedir/g" \
-e "s/${LWORD}_get_comp_words_by_ref${RWORD}/__tiup_get_comp_words_by_ref/g" \
-e "s/${LWORD}__ltrim_colon_completions${RWORD}/__tiup_ltrim_colon_completions/g" \
-e "s/${LWORD}compgen${RWORD}/__tiup_compgen/g" \
-e "s/${LWORD}compopt${RWORD}/__tiup_compopt/g" \
-e "s/${LWORD}declare${RWORD}/builtin declare/g" \
-e "s/\\\$(type${RWORD}/\$(__tiup_type/g" \
<<'BASH_COMPLETION_EOF'
`
_, _ = out.Write([]byte(zshInitialization))
buf := new(bytes.Buffer)
_ = tiup.GenBashCompletion(buf)
_, _ = out.Write(buf.Bytes())
zshTail := `
BASH_COMPLETION_EOF
}
__tiup_bash_source <(__tiup_convert_bash_to_zsh)
`
_, _ = out.Write([]byte(zshTail))
return nil
}