package cobra import ( "bytes" "fmt" "os" "strings" "github.com/spf13/pflag" ) const ( BashCompFilenameExt = "cobra_annotation_bash_completion_filename_extentions" BashCompOneRequiredFlag = "cobra_annotation_bash_completion_one_required_flag" ) func preamble(out *bytes.Buffer) { fmt.Fprintf(out, `#!/bin/bash __debug() { if [[ -n ${BASH_COMP_DEBUG_FILE} ]]; then echo "$*" >> ${BASH_COMP_DEBUG_FILE} fi } __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 -*) compopt -o nospace 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") ) [[ $COMPREPLY == *= ]] || compopt +o nospace return 0; ;; esac # check if we are handling a flag with special work handling local index __index_of_word "${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 [[ ${#COMPREPLY[@]} -eq 0 ]]; then declare -F __custom_func >/dev/null && __custom_func fi } __handle_flag() { __debug "${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]} # if the word contained an = if [[ ${words[c]} == *"="* ]]; then flagname=${flagname%%=*} # strip everything after the = flagname="${flagname}=" # but put the = back fi __debug "${FUNCNAME}: looking for ${flagname}" if __contains_word "${flagname}" "${must_have_one_flag[@]}"; then must_have_one_flag=() fi # skip the argument to a two word flag if __contains_word "${words[c]}" "${two_word_flags[@]}"; then c=$((c+1)) # if we are looking for a flags value, don't show commands if [[ $c -eq $cword ]]; then commands=() fi fi # skip the flag itself c=$((c+1)) } __handle_noun() { __debug "${FUNCNAME}: c is $c words[c] is ${words[c]}" if __contains_word "${words[c]}" "${must_have_one_noun[@]}"; then must_have_one_noun=() fi nouns+=("${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}_${words[c]}" else next_command="_${words[c]}" 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 else __handle_noun fi __handle_word } `) } func postscript(out *bytes.Buffer, name string) { fmt.Fprintf(out, "__start_%s()\n", name) fmt.Fprintf(out, `{ local cur prev words cword split _init_completion -s || return local completions_func 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) fmt.Fprintf(out, "complete -F __start_%s %s\n", name, name) fmt.Fprintf(out, "# ex: ts=4 sw=4 et filetype=sh\n") } func writeCommands(cmd *Command, out *bytes.Buffer) { fmt.Fprintf(out, " commands=()\n") for _, c := range cmd.Commands() { fmt.Fprintf(out, " commands+=(%q)\n", c.Name()) } fmt.Fprintf(out, "\n") } func writeFlagHandler(name string, annotations map[string][]string, out *bytes.Buffer) { for key, value := range annotations { switch key { case BashCompFilenameExt: fmt.Fprintf(out, " flags_with_completion+=(%q)\n", name) ext := strings.Join(value, "|") ext = "_filedir '@(" + ext + ")'" fmt.Fprintf(out, " flags_completion+=(%q)\n", ext) } } } func writeShortFlag(flag *pflag.Flag, out *bytes.Buffer) { b := (flag.Value.Type() == "bool") name := flag.Shorthand format := " " if !b { format += "two_word_" } format += "flags+=(\"-%s\")\n" fmt.Fprintf(out, format, name) writeFlagHandler("-"+name, flag.Annotations, out) } func writeFlag(flag *pflag.Flag, out *bytes.Buffer) { b := (flag.Value.Type() == "bool") name := flag.Name format := " flags+=(\"--%s" if !b { format += "=" } format += "\")\n" fmt.Fprintf(out, format, name) writeFlagHandler("--"+name, flag.Annotations, out) } func writeFlags(cmd *Command, out *bytes.Buffer) { fmt.Fprintf(out, ` flags=() two_word_flags=() flags_with_completion=() flags_completion=() `) cmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) { writeFlag(flag, out) if len(flag.Shorthand) > 0 { writeShortFlag(flag, out) } }) fmt.Fprintf(out, "\n") } func writeRequiredFlag(cmd *Command, out *bytes.Buffer) { fmt.Fprintf(out, " must_have_one_flag=()\n") flags := cmd.NonInheritedFlags() 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" fmt.Fprintf(out, format, flag.Name) if len(flag.Shorthand) > 0 { fmt.Fprintf(out, " must_have_one_flag+=(\"-%s\")\n", flag.Shorthand) } } } }) } func writeRequiredNoun(cmd *Command, out *bytes.Buffer) { fmt.Fprintf(out, " must_have_one_noun=()\n") for _, value := range cmd.ValidArgs { fmt.Fprintf(out, " must_have_one_noun+=(%q)\n", value) } } func gen(cmd *Command, out *bytes.Buffer) { for _, c := range cmd.Commands() { gen(c, out) } commandName := cmd.CommandPath() commandName = strings.Replace(commandName, " ", "_", -1) fmt.Fprintf(out, "_%s()\n{\n", commandName) fmt.Fprintf(out, " last_command=%q\n", commandName) writeCommands(cmd, out) writeFlags(cmd, out) writeRequiredFlag(cmd, out) writeRequiredNoun(cmd, out) fmt.Fprintf(out, "}\n\n") } func (cmd *Command) GenBashCompletion(out *bytes.Buffer) { preamble(out) if len(cmd.BashCompletionFunction) > 0 { fmt.Fprintf(out, "%s\n", cmd.BashCompletionFunction) } gen(cmd, out) postscript(out, cmd.Name()) } func (cmd *Command) GenBashCompletionFile(filename string) error { out := new(bytes.Buffer) cmd.GenBashCompletion(out) outFile, err := os.Create(filename) if err != nil { return err } defer outFile.Close() _, err = outFile.Write(out.Bytes()) if err != nil { return err } return nil }