From dae15676e49893886baf16004248c3974f05be1d Mon Sep 17 00:00:00 2001 From: Suraj Narwade Date: Wed, 19 Jul 2017 14:35:26 +0530 Subject: [PATCH] Added bash/zsh autocompletion support Added `completion.go` for autocompletion of commands. (inspired from kompose) --- cmd/completion.go | 218 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 cmd/completion.go diff --git a/cmd/completion.go b/cmd/completion.go new file mode 100644 index 000000000..23e0befe9 --- /dev/null +++ b/cmd/completion.go @@ -0,0 +1,218 @@ +package cmd + +import ( + "bytes" + "fmt" + "io" + "os" + + log "github.com/Sirupsen/logrus" + "github.com/spf13/cobra" +) + +var completion = &cobra.Command{ + Use: "completion SHELL", + Short: "Output shell completion code", + Long: `Generates shell completion code. + +Auto completion supports both bash and zsh. Output is to STDOUT. + +source <(kedge completion bash) +source <(kedge completion zsh) + +Will load the shell completion code. + `, + + RunE: func(cmd *cobra.Command, args []string) error { + + err := Generate(cmd, args) + if err != nil { + log.Fatalf("Error: %s", err) + } + + return nil + }, +} + +// Generate the the approriate autocompletion file +func Generate(cmd *cobra.Command, args []string) error { + + // Check the passed in arguments + if len(args) == 0 { + return fmt.Errorf("Shell not specified. ex. kedge completion [bash|zsh]") + } + if len(args) > 1 { + return fmt.Errorf("Too many arguments. Expected only the shell type. ex. kedge completion [bash|zsh]") + } + shell := args[0] + + // Generate bash through cobra if selected + if shell == "bash" { + return cmd.Root().GenBashCompletion(os.Stdout) + + // Generate zsh with the appropriate conversion as well as bash inclusion + } else if shell == "zsh" { + return runCompletionZsh(os.Stdout, cmd.Root()) + + // Else, return an error. + } else { + return fmt.Errorf("not a compatible shell, bash and zsh are only supported") + } +} + +func init() { + RootCmd.AddCommand(completion) +} + +/* + This is copied from + https://github.com/kubernetes/kubernetes/blob/ea18d5c32ee7c320fe96dda6b0c757476908e696/pkg/kubectl/cmd/completion.go + in order to generate ZSH completion support. +*/ +func runCompletionZsh(out io.Writer, kedge *cobra.Command) error { + + zshInitialization := ` +__kedge_bash_source() { + alias shopt=':' + alias _expand=_bash_expand + alias _complete=_bash_comp + emulate -L sh + setopt kshglob noshglob braceexpand + source "$@" +} +__kedge_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 [ "$1" = "__kedge_compopt" ]; then + echo builtin + return 0 + fi + fi + type "$@" +} +__kedge_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 +} +__kedge_compopt() { + true # don't do anything. Not supported by bashcompinit in zsh +} +__kedge_declare() { + if [ "$1" == "-F" ]; then + whence -w "$@" + else + builtin declare "$@" + fi +} +__kedge_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]#"$colon_word"} + done + fi +} +__kedge_get_comp_words_by_ref() { + cur="${COMP_WORDS[COMP_CWORD]}" + prev="${COMP_WORDS[${COMP_CWORD}-1]}" + words=("${COMP_WORDS[@]}") + cword=("${COMP_CWORD[@]}") +} +__kedge_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}\" = *.$1 || -d \"\${w}\" ]]"; then + qw="$(__kedge_quote "${w}")" + if [ -d "${w}" ]; then + COMPREPLY+=("${qw}/") + else + COMPREPLY+=("${qw}") + fi + fi + done +} +__kedge_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 +__kedge_convert_bash_to_zsh() { + sed \ + -e 's/declare -F/whence -w/' \ + -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}/__kedge_filedir/g" \ + -e "s/${LWORD}_get_comp_words_by_ref${RWORD}/__kedge_get_comp_words_by_ref/g" \ + -e "s/${LWORD}__ltrim_colon_completions${RWORD}/__kedge_ltrim_colon_completions/g" \ + -e "s/${LWORD}compgen${RWORD}/__kedge_compgen/g" \ + -e "s/${LWORD}compopt${RWORD}/__kedge_compopt/g" \ + -e "s/${LWORD}declare${RWORD}/__kedge_declare/g" \ + -e "s/\\\$(type${RWORD}/\$(__kedge_type/g" \ + <<'BASH_COMPLETION_EOF' +` + out.Write([]byte(zshInitialization)) + + buf := new(bytes.Buffer) + kedge.GenBashCompletion(buf) + out.Write(buf.Bytes()) + + zshTail := ` +BASH_COMPLETION_EOF +} +__kedge_bash_source <(__kedge_convert_bash_to_zsh) +` + out.Write([]byte(zshTail)) + return nil +}