package cobra import ( "fmt" "io" "os" "sort" "strings" "github.com/spf13/pflag" ) const ( BashCompFilenameExt = "cobra_annotation_bash_completion_filename_extentions" BashCompCustom = "cobra_annotation_bash_completion_custom" BashCompOneRequiredFlag = "cobra_annotation_bash_completion_one_required_flag" BashCompSubdirsInDir = "cobra_annotation_bash_completion_subdirs_in_dir" ) func preamble(out io.Writer, name string) error { _, err := fmt.Fprintf(out, "# bash completion for %-36s -*- shell-script -*-\n", name) if err != nil { return err } _, err = fmt.Fprint(out, ` __debug() { if [[ -n ${BASH_COMP_DEBUG_FILE} ]]; then echo "$*" >> "${BASH_COMP_DEBUG_FILE}" fi } # Homebrew on Macs have version 1.3 of bash-completion which doesn't include # _init_completion. This is a very minimal version of that function. __my_init_completion() { COMPREPLY=() _get_comp_words_by_ref "$@" cur prev words cword } __index_of_word() { local w word=$1 shift index=0 for w in "$@"; do [[ $w = "$word" ]] && return index=$((index+1)) done index=-1 } __contains_word() { local w word=$1; shift for w in "$@"; do [[ $w = "$word" ]] && return done return 1 } __handle_reply() { __debug "${FUNCNAME}" case $cur in -*) if [[ $(type -t compopt) = "builtin" ]]; then compopt -o nospace fi local allflags if [ ${#must_have_one_flag[@]} -ne 0 ]; then allflags=("${must_have_one_flag[@]}") else allflags=("${flags[*]} ${two_word_flags[*]}") fi COMPREPLY=( $(compgen -W "${allflags[*]}" -- "$cur") ) if [[ $(type -t compopt) = "builtin" ]]; then [[ $COMPREPLY == *= ]] || compopt +o nospace fi # complete after --flag=abc if [[ $cur == *=* ]]; then if [[ $(type -t compopt) = "builtin" ]]; then compopt +o nospace fi local index flag flag="${cur%%=*}" __index_of_word "${flag}" "${flags_with_completion[@]}" if [[ ${index} -ge 0 ]]; then COMPREPLY=() PREFIX="" cur="${cur#*=}" ${flags_completion[${index}]} if [ -n "${ZSH_VERSION}" ]; then # zfs completion needs --flag= prefix eval COMPREPLY=( "\${COMPREPLY[@]/#/${flag}=}" ) fi fi fi return 0; ;; esac # check if we are handling a flag with special work handling local index __index_of_word "${prev}" "${flags_with_completion[@]}" if [[ ${index} -ge 0 ]]; then ${flags_completion[${index}]} return fi # we are parsing a flag and don't have a special handler, no completion if [[ ${cur} != "${words[cword]}" ]]; then return fi local completions if [[ ${#must_have_one_flag[@]} -ne 0 ]]; then completions=("${must_have_one_flag[@]}") elif [[ ${#must_have_one_noun[@]} -ne 0 ]]; then completions=("${must_have_one_noun[@]}") else completions=("${commands[@]}") fi COMPREPLY=( $(compgen -W "${completions[*]}" -- "$cur") ) if [[ ${#COMPREPLY[@]} -eq 0 && ${#noun_aliases[@]} -gt 0 && ${#must_have_one_noun[@]} -ne 0 ]]; then COMPREPLY=( $(compgen -W "${noun_aliases[*]}" -- "$cur") ) fi if [[ ${#COMPREPLY[@]} -eq 0 ]]; then declare -F __custom_func >/dev/null && __custom_func fi __ltrim_colon_completions "$cur" } # The arguments should be in the form "ext1|ext2|extn" __handle_filename_extension_flag() { local ext="$1" _filedir "@(${ext})" } __handle_subdirs_in_dir_flag() { local dir="$1" pushd "${dir}" >/dev/null 2>&1 && _filedir -d && popd >/dev/null 2>&1 } __handle_flag() { __debug "${FUNCNAME}: c is $c words[c] is ${words[c]}" # if a command required a flag, and we found it, unset must_have_one_flag() local flagname=${words[c]} local flagvalue # if the word contained an = if [[ ${words[c]} == *"="* ]]; then flagvalue=${flagname#*=} # take in as flagvalue after the = flagname=${flagname%%=*} # strip everything after the = flagname="${flagname}=" # but put the = back fi __debug "${FUNCNAME}: looking for ${flagname}" if __contains_word "${flagname}" "${must_have_one_flag[@]}"; then must_have_one_flag=() fi # keep flag value with flagname as flaghash if [ ${flagvalue} ] ; then flaghash[${flagname}]=${flagvalue} elif [ ${words[ $((c+1)) ]} ] ; then flaghash[${flagname}]=${words[ $((c+1)) ]} else flaghash[${flagname}]="true" # pad "true" for bool flag fi # skip the argument to a two word flag if __contains_word "${words[c]}" "${two_word_flags[@]}"; then c=$((c+1)) # if we are looking for a flags value, don't show commands if [[ $c -eq $cword ]]; then commands=() fi fi c=$((c+1)) } __handle_noun() { __debug "${FUNCNAME}: c is $c words[c] is ${words[c]}" if __contains_word "${words[c]}" "${must_have_one_noun[@]}"; then must_have_one_noun=() elif __contains_word "${words[c]}" "${noun_aliases[@]}"; then must_have_one_noun=() fi nouns+=("${words[c]}") c=$((c+1)) } __handle_command() { __debug "${FUNCNAME}: c is $c words[c] is ${words[c]}" local next_command if [[ -n ${last_command} ]]; then next_command="_${last_command}_${words[c]//:/__}" else if [[ $c -eq 0 ]]; then next_command="_$(basename ${words[c]//:/__})" else next_command="_${words[c]//:/__}" fi fi c=$((c+1)) __debug "${FUNCNAME}: looking for ${next_command}" declare -F $next_command >/dev/null && $next_command } __handle_word() { if [[ $c -ge $cword ]]; then __handle_reply return fi __debug "${FUNCNAME}: c is $c words[c] is ${words[c]}" if [[ "${words[c]}" == -* ]]; then __handle_flag elif __contains_word "${words[c]}" "${commands[@]}"; then __handle_command elif [[ $c -eq 0 ]] && __contains_word "$(basename ${words[c]})" "${commands[@]}"; then __handle_command else __handle_noun fi __handle_word } `) return err } func postscript(w io.Writer, name string) error { name = strings.Replace(name, ":", "__", -1) _, err := fmt.Fprintf(w, "__start_%s()\n", name) if err != nil { return err } _, err = fmt.Fprintf(w, `{ local cur prev words cword declare -A flaghash 2>/dev/null || : if declare -F _init_completion >/dev/null 2>&1; then _init_completion -s || return else __my_init_completion -n "=" || return fi local c=0 local flags=() local two_word_flags=() local flags_with_completion=() local flags_completion=() local commands=("%s") local must_have_one_flag=() local must_have_one_noun=() local last_command local nouns=() __handle_word } `, name) if err != nil { return err } _, err = fmt.Fprintf(w, `if [[ $(type -t compopt) = "builtin" ]]; then complete -o default -F __start_%s %s else complete -o default -o nospace -F __start_%s %s fi `, name, name, name, name) if err != nil { return err } _, err = fmt.Fprintf(w, "# ex: ts=4 sw=4 et filetype=sh\n") return err } func writeCommands(cmd *Command, w io.Writer) error { if _, err := fmt.Fprintf(w, " commands=()\n"); err != nil { return err } for _, c := range cmd.Commands() { if !c.IsAvailableCommand() || c == cmd.helpCommand { continue } if _, err := fmt.Fprintf(w, " commands+=(%q)\n", c.Name()); err != nil { return err } } _, err := fmt.Fprintf(w, "\n") return err } func writeFlagHandler(name string, annotations map[string][]string, w io.Writer) error { for key, value := range annotations { switch key { case BashCompFilenameExt: _, err := fmt.Fprintf(w, " flags_with_completion+=(%q)\n", name) if err != nil { return err } if len(value) > 0 { ext := "__handle_filename_extension_flag " + strings.Join(value, "|") _, err = fmt.Fprintf(w, " flags_completion+=(%q)\n", ext) } else { ext := "_filedir" _, err = fmt.Fprintf(w, " flags_completion+=(%q)\n", ext) } if err != nil { return err } case BashCompCustom: _, err := fmt.Fprintf(w, " flags_with_completion+=(%q)\n", name) if err != nil { return err } if len(value) > 0 { handlers := strings.Join(value, "; ") _, err = fmt.Fprintf(w, " flags_completion+=(%q)\n", handlers) } else { _, err = fmt.Fprintf(w, " flags_completion+=(:)\n") } if err != nil { return err } case BashCompSubdirsInDir: _, err := fmt.Fprintf(w, " flags_with_completion+=(%q)\n", name) if len(value) == 1 { ext := "__handle_subdirs_in_dir_flag " + value[0] _, err = fmt.Fprintf(w, " flags_completion+=(%q)\n", ext) } else { ext := "_filedir -d" _, err = fmt.Fprintf(w, " flags_completion+=(%q)\n", ext) } if err != nil { return err } } } return nil } func writeShortFlag(flag *pflag.Flag, w io.Writer) error { b := (flag.Value.Type() == "bool") name := flag.Shorthand format := " " if !b { format += "two_word_" } format += "flags+=(\"-%s\")\n" if _, err := fmt.Fprintf(w, format, name); err != nil { return err } return writeFlagHandler("-"+name, flag.Annotations, w) } func writeFlag(flag *pflag.Flag, w io.Writer) error { b := (flag.Value.Type() == "bool") name := flag.Name format := " flags+=(\"--%s" if !b { format += "=" } format += "\")\n" if _, err := fmt.Fprintf(w, format, name); err != nil { return err } return writeFlagHandler("--"+name, flag.Annotations, w) } func writeFlags(cmd *Command, w io.Writer) error { _, err := fmt.Fprintf(w, ` flags=() two_word_flags=() flags_with_completion=() flags_completion=() `) if err != nil { return err } var visitErr error cmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) { if err := writeFlag(flag, w); err != nil { visitErr = err return } if len(flag.Shorthand) > 0 { if err := writeShortFlag(flag, w); err != nil { visitErr = err return } } }) if visitErr != nil { return visitErr } cmd.InheritedFlags().VisitAll(func(flag *pflag.Flag) { if err := writeFlag(flag, w); err != nil { visitErr = err return } if len(flag.Shorthand) > 0 { if err := writeShortFlag(flag, w); err != nil { visitErr = err return } } }) if visitErr != nil { return visitErr } _, err = fmt.Fprintf(w, "\n") return err } func writeRequiredFlag(cmd *Command, w io.Writer) error { if _, err := fmt.Fprintf(w, " must_have_one_flag=()\n"); err != nil { return err } flags := cmd.NonInheritedFlags() var visitErr error flags.VisitAll(func(flag *pflag.Flag) { for key := range flag.Annotations { switch key { case BashCompOneRequiredFlag: format := " must_have_one_flag+=(\"--%s" b := (flag.Value.Type() == "bool") if !b { format += "=" } format += "\")\n" if _, err := fmt.Fprintf(w, format, flag.Name); err != nil { visitErr = err return } if len(flag.Shorthand) > 0 { if _, err := fmt.Fprintf(w, " must_have_one_flag+=(\"-%s\")\n", flag.Shorthand); err != nil { visitErr = err return } } } } }) return visitErr } func writeRequiredNouns(cmd *Command, w io.Writer) error { if _, err := fmt.Fprintf(w, " must_have_one_noun=()\n"); err != nil { return err } sort.Sort(sort.StringSlice(cmd.ValidArgs)) for _, value := range cmd.ValidArgs { if _, err := fmt.Fprintf(w, " must_have_one_noun+=(%q)\n", value); err != nil { return err } } return nil } func writeArgAliases(cmd *Command, w io.Writer) error { if _, err := fmt.Fprintf(w, " noun_aliases=()\n"); err != nil { return err } sort.Sort(sort.StringSlice(cmd.ArgAliases)) for _, value := range cmd.ArgAliases { if _, err := fmt.Fprintf(w, " noun_aliases+=(%q)\n", value); err != nil { return err } } return nil } func gen(cmd *Command, w io.Writer) error { for _, c := range cmd.Commands() { if !c.IsAvailableCommand() || c == cmd.helpCommand { continue } if err := gen(c, w); err != nil { return err } } commandName := cmd.CommandPath() commandName = strings.Replace(commandName, " ", "_", -1) commandName = strings.Replace(commandName, ":", "__", -1) if _, err := fmt.Fprintf(w, "_%s()\n{\n", commandName); err != nil { return err } if _, err := fmt.Fprintf(w, " last_command=%q\n", commandName); err != nil { return err } if err := writeCommands(cmd, w); err != nil { return err } if err := writeFlags(cmd, w); err != nil { return err } if err := writeRequiredFlag(cmd, w); err != nil { return err } if err := writeRequiredNouns(cmd, w); err != nil { return err } if err := writeArgAliases(cmd, w); err != nil { return err } if _, err := fmt.Fprintf(w, "}\n\n"); err != nil { return err } return nil } func (cmd *Command) GenBashCompletion(w io.Writer) error { if err := preamble(w, cmd.Name()); err != nil { return err } if len(cmd.BashCompletionFunction) > 0 { if _, err := fmt.Fprintf(w, "%s\n", cmd.BashCompletionFunction); err != nil { return err } } if err := gen(cmd, w); err != nil { return err } return postscript(w, cmd.Name()) } func (cmd *Command) GenBashCompletionFile(filename string) error { outFile, err := os.Create(filename) if err != nil { return err } defer outFile.Close() return cmd.GenBashCompletion(outFile) } // MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag, if it exists. func (cmd *Command) MarkFlagRequired(name string) error { return MarkFlagRequired(cmd.Flags(), name) } // MarkPersistentFlagRequired adds the BashCompOneRequiredFlag annotation to the named persistent flag, if it exists. func (cmd *Command) MarkPersistentFlagRequired(name string) error { return MarkFlagRequired(cmd.PersistentFlags(), name) } // MarkFlagRequired adds the BashCompOneRequiredFlag annotation to the named flag in the flag set, if it exists. func MarkFlagRequired(flags *pflag.FlagSet, name string) error { return flags.SetAnnotation(name, BashCompOneRequiredFlag, []string{"true"}) } // MarkFlagFilename adds the BashCompFilenameExt annotation to the named flag, if it exists. // Generated bash autocompletion will select filenames for the flag, limiting to named extensions if provided. func (cmd *Command) MarkFlagFilename(name string, extensions ...string) error { return MarkFlagFilename(cmd.Flags(), name, extensions...) } // MarkFlagCustom adds the BashCompCustom annotation to the named flag, if it exists. // Generated bash autocompletion will call the bash function f for the flag. func (cmd *Command) MarkFlagCustom(name string, f string) error { return MarkFlagCustom(cmd.Flags(), name, f) } // MarkPersistentFlagFilename adds the BashCompFilenameExt annotation to the named persistent flag, if it exists. // Generated bash autocompletion will select filenames for the flag, limiting to named extensions if provided. func (cmd *Command) MarkPersistentFlagFilename(name string, extensions ...string) error { return MarkFlagFilename(cmd.PersistentFlags(), name, extensions...) } // MarkFlagFilename adds the BashCompFilenameExt annotation to the named flag in the flag set, if it exists. // Generated bash autocompletion will select filenames for the flag, limiting to named extensions if provided. func MarkFlagFilename(flags *pflag.FlagSet, name string, extensions ...string) error { return flags.SetAnnotation(name, BashCompFilenameExt, extensions) } // MarkFlagCustom adds the BashCompCustom annotation to the named flag in the flag set, if it exists. // Generated bash autocompletion will call the bash function f for the flag. func MarkFlagCustom(flags *pflag.FlagSet, name string, f string) error { return flags.SetAnnotation(name, BashCompCustom, []string{f}) }