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completion.go
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completion.go
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package completion
import (
"bytes"
"io"
"github.com/spf13/cobra"
)
// FlagAnnotation adds a bash completion annotation to command c for flag f.
// completionFunc is the bash function identifier that should be called upon
// completion requests.
func FlagAnnotation(c *cobra.Command, f string, completionFunc string) {
if c.Flag(f).Annotations == nil {
c.Flag(f).Annotations = map[string][]string{}
}
c.Flag(f).Annotations[cobra.BashCompCustom] = []string{completionFunc}
}
// Hamctl contains bash completions for the hamctl command.
const Hamctl = `
__hamctl_get_environments()
{
local template
template=$'{{ range $k, $v := . }}{{ $k }} {{ end }}'
local shuttle_out
if shuttle_out=$(shuttle --skip-pull get k8s --template="${template}" 2>/dev/null); then
# remove "local" from possible environments as it has no use for hamctl
shuttle_out=${shuttle_out[@]//local}
COMPREPLY=( $( compgen -W "${shuttle_out[@]}" -- "$cur" ) )
fi
}
__hamctl_get_namespaces()
{
local template
template="{{ range .items }}{{ .metadata.name }} {{ end }}"
local kubectl_out
if kubectl_out=$(kubectl get -o template --template="${template}" namespace 2>/dev/null); then
COMPREPLY=( $( compgen -W "${kubectl_out[*]}" -- "$cur" ) )
fi
}
__hamctl_get_branches()
{
local git_out
if git_out=$(git branch --remote | grep -v HEAD | sed 's/[ \t*]origin\///' 2>/dev/null); then
COMPREPLY=( $( compgen -W "${git_out[*]}" -- "$cur" ) )
fi
}
`
// Zsh writes a zsh completion script that wraps the bash completion script.
//
// Copied from kubectl: https://github.com/kubernetes/kubernetes/blob/9c2df998af9eb565f11d42725dc77e9266483ffc/pkg/kubectl/cmd/completion/completion.go#L145
func Zsh(out io.Writer, hamctl *cobra.Command) error {
zshHead := "#compdef hamctl\n"
_, err := out.Write([]byte(zshHead))
if err != nil {
return err
}
zshInitialization := `
__hamctl_bash_source() {
alias shopt=':'
alias _expand=_bash_expand
alias _complete=_bash_comp
emulate -L sh
setopt kshglob noshglob braceexpand
source "$@"
}
__hamctl_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 [ "$1" = "__hamctl_compopt" ]; then
echo builtin
return 0
fi
fi
type "$@"
}
__hamctl_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
}
__hamctl_compopt() {
true # don't do anything. Not supported by bashcompinit in zsh
}
__hamctl_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]#"$colon_word"}
done
fi
}
__hamctl_get_comp_words_by_ref() {
cur="${COMP_WORDS[COMP_CWORD]}"
prev="${COMP_WORDS[${COMP_CWORD}-1]}"
words=("${COMP_WORDS[@]}")
cword=("${COMP_CWORD[@]}")
}
__hamctl_filedir() {
local RET OLD_IFS w qw
__hamctl_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="," __hamctl_debug "RET=${RET[@]} len=${#RET[@]}"
for w in ${RET[@]}; do
if [[ ! "${w}" = "${cur}"* ]]; then
continue
fi
if eval "[[ \"\${w}\" = *.$1 || -d \"\${w}\" ]]"; then
qw="$(__hamctl_quote "${w}")"
if [ -d "${w}" ]; then
COMPREPLY+=("${qw}/")
else
COMPREPLY+=("${qw}")
fi
fi
done
}
__hamctl_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
__hamctl_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}/__hamctl_filedir/g" \
-e "s/${LWORD}_get_comp_words_by_ref${RWORD}/__hamctl_get_comp_words_by_ref/g" \
-e "s/${LWORD}__ltrim_colon_completions${RWORD}/__hamctl_ltrim_colon_completions/g" \
-e "s/${LWORD}compgen${RWORD}/__hamctl_compgen/g" \
-e "s/${LWORD}compopt${RWORD}/__hamctl_compopt/g" \
-e "s/${LWORD}declare${RWORD}/builtin declare/g" \
-e "s/\\\$(type${RWORD}/\$(__hamctl_type/g" \
<<'BASH_COMPLETION_EOF'
`
_, err = out.Write([]byte(zshInitialization))
if err != nil {
return err
}
buf := new(bytes.Buffer)
err = hamctl.GenBashCompletion(buf)
if err != nil {
return err
}
_, err = out.Write(buf.Bytes())
if err != nil {
return err
}
zshTail := `
BASH_COMPLETION_EOF
}
__hamctl_bash_source <(__hamctl_convert_bash_to_zsh)
_complete hamctl 2>/dev/null
`
_, err = out.Write([]byte(zshTail))
if err != nil {
return err
}
return nil
}