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completion.go
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completion.go
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package main
import (
"bytes"
"fmt"
"io"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/spf13/cobra"
)
func completionCmd(dockerCli command.Cli, rootCmd *cobra.Command) *cobra.Command {
return &cobra.Command{
Use: "completion SHELL",
Short: "Generates completion scripts for the specified shell (bash or zsh)",
Long: `# Load the docker-app completion code for bash into the current shell
. <(docker-app completion bash)
# Set the docker-app completion code for bash to autoload on startup in your ~/.bashrc,
# ~/.profile or ~/.bash_profile
. <(docker-app completion bash)
# Note: bash-completion is needed.
# Load the docker-app completion code for zsh into the current shell
source <(docker-app completion zsh)
# Set the docker-app completion code for zsh to autoload on startup in your ~/.zshrc
source <(docker-app completion zsh)
`,
Args: cli.RequiresMaxArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
switch {
case len(args) == 0:
return rootCmd.GenBashCompletion(dockerCli.Out())
case args[0] == "bash":
return rootCmd.GenBashCompletion(dockerCli.Out())
case args[0] == "zsh":
return runCompletionZsh(dockerCli.Out(), rootCmd)
default:
return fmt.Errorf("%q is not a supported shell", args[0])
}
},
}
}
const (
// Largely inspired by https://github.com/kubernetes/kubernetes/blob/master/pkg/kubectl/cmd/completion.go
zshHead = `#compdef dockerapp
__dockerapp_bash_source() {
alias shopt=':'
alias _expand=_bash_expand
alias _complete=_bash_comp
emulate -L sh
setopt kshglob noshglob braceexpand
source "$@"
}
__dockerapp_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 [ "$1" = "__dockerapp_compopt" ]; then
echo builtin
return 0
fi
fi
type "$@"
}
__dockerapp_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
}
__dockerapp_compopt() {
true # don't do anything. Not supported by bashcompinit in zsh
}
__dockerapp_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]#"$colon_word"}
done
fi
}
__dockerapp_get_comp_words_by_ref() {
cur="${COMP_WORDS[COMP_CWORD]}"
prev="${COMP_WORDS[${COMP_CWORD}-1]}"
words=("${COMP_WORDS[@]}")
cword=("${COMP_CWORD[@]}")
}
__dockerapp_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}\" = *.$1 || -d \"\${w}\" ]]"; then
qw="$(__dockerapp_quote "${w}")"
if [ -d "${w}" ]; then
COMPREPLY+=("${qw}/")
else
COMPREPLY+=("${qw}")
fi
fi
done
}
__dockerapp_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
__dockerapp_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}/__dockerapp_filedir/g" \
-e "s/${LWORD}_get_comp_words_by_ref${RWORD}/__dockerapp_get_comp_words_by_ref/g" \
-e "s/${LWORD}__ltrim_colon_completions${RWORD}/__dockerapp_ltrim_colon_completions/g" \
-e "s/${LWORD}compgen${RWORD}/__dockerapp_compgen/g" \
-e "s/${LWORD}compopt${RWORD}/__dockerapp_compopt/g" \
-e "s/${LWORD}declare${RWORD}/builtin declare/g" \
-e "s/\\\$(type${RWORD}/\$(__dockerapp_type/g" \
<<'BASH_COMPLETION_EOF'
`
zshTail = `
BASH_COMPLETION_EOF
}
__dockerapp_bash_source <(__dockerapp_convert_bash_to_zsh)
_complete dockerapp 2>/dev/null
`
)
func runCompletionZsh(out io.Writer, rootCmd *cobra.Command) error {
fmt.Fprint(out, zshHead)
buf := new(bytes.Buffer)
rootCmd.GenBashCompletion(buf)
fmt.Fprint(out, buf.String())
fmt.Fprint(out, zshTail)
return nil
}