package cobra import ( "bytes" "fmt" "io" "os" "sort" "strings" "github.com/spf13/pflag" ) // Annotations for Bash completion. const ( BashCompFilenameExt = "cobra_annotation_bash_completion_filename_extensions" BashCompCustom = "cobra_annotation_bash_completion_custom" BashCompOneRequiredFlag = "cobra_annotation_bash_completion_one_required_flag" BashCompSubdirsInDir = "cobra_annotation_bash_completion_subdirs_in_dir" ) func writePreamble(buf *bytes.Buffer, name string) { buf.WriteString(fmt.Sprintf("# bash completion for %-36s -*- shell-script -*-\n", name)) buf.WriteString(fmt.Sprintf(` __%[1]s_debug() { if [[ -n ${BASH_COMP_DEBUG_FILE} ]]; then echo "$*" >> "${BASH_COMP_DEBUG_FILE}" fi } # Homebrew on Macs have version 1.3 of bash-completion which doesn't include # _init_completion. This is a very minimal version of that function. __%[1]s_init_completion() { COMPREPLY=() _get_comp_words_by_ref "$@" cur prev words cword } __%[1]s_index_of_word() { local w word=$1 shift index=0 for w in "$@"; do [[ $w = "$word" ]] && return index=$((index+1)) done index=-1 } __%[1]s_contains_word() { local w word=$1; shift for w in "$@"; do [[ $w = "$word" ]] && return done return 1 } __%[1]s_handle_go_custom_completion() { __%[1]s_debug "${FUNCNAME[0]}: cur is ${cur}, words[*] is ${words[*]}, #words[@] is ${#words[@]}" local out requestComp lastParam lastChar comp directive args # Prepare the command to request completions for the program. # Calling ${words[0]} instead of directly %[1]s allows to handle aliases args=("${words[@]:1}") requestComp="${words[0]} %[2]s ${args[*]}" lastParam=${words[$((${#words[@]}-1))]} lastChar=${lastParam:$((${#lastParam}-1)):1} __%[1]s_debug "${FUNCNAME[0]}: lastParam ${lastParam}, lastChar ${lastChar}" if [ -z "${cur}" ] && [ "${lastChar}" != "=" ]; then # If the last parameter is complete (there is a space following it) # We add an extra empty parameter so we can indicate this to the go method. __%[1]s_debug "${FUNCNAME[0]}: Adding extra empty parameter" requestComp="${requestComp} \"\"" fi __%[1]s_debug "${FUNCNAME[0]}: calling ${requestComp}" # Use eval to handle any environment variables and such out=$(eval "${requestComp}" 2>/dev/null) # Extract the directive integer at the very end of the output following a colon (:) directive=${out##*:} # Remove the directive out=${out%%:*} if [ "${directive}" = "${out}" ]; then # There is not directive specified directive=0 fi __%[1]s_debug "${FUNCNAME[0]}: the completion directive is: ${directive}" __%[1]s_debug "${FUNCNAME[0]}: the completions are: ${out[*]}" if [ $((directive & %[3]d)) -ne 0 ]; then # Error code. No completion. __%[1]s_debug "${FUNCNAME[0]}: received error from custom completion go code" return else if [ $((directive & %[4]d)) -ne 0 ]; then if [[ $(type -t compopt) = "builtin" ]]; then __%[1]s_debug "${FUNCNAME[0]}: activating no space" compopt -o nospace fi fi if [ $((directive & %[5]d)) -ne 0 ]; then if [[ $(type -t compopt) = "builtin" ]]; then __%[1]s_debug "${FUNCNAME[0]}: activating no file completion" compopt +o default fi fi while IFS='' read -r comp; do COMPREPLY+=("$comp") done < <(compgen -W "${out[*]}" -- "$cur") fi } __%[1]s_handle_reply() { __%[1]s_debug "${FUNCNAME[0]}" local comp 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[*]} ${two_word_flags[*]}") fi while IFS='' read -r comp; do COMPREPLY+=("$comp") done < <(compgen -W "${allflags[*]}" -- "$cur") if [[ $(type -t compopt) = "builtin" ]]; then [[ "${COMPREPLY[0]}" == *= ]] || 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%%=*}" __%[1]s_index_of_word "${flag}" "${flags_with_completion[@]}" COMPREPLY=() if [[ ${index} -ge 0 ]]; then PREFIX="" cur="${cur#*=}" ${flags_completion[${index}]} if [ -n "${ZSH_VERSION}" ]; then # zsh completion needs --flag= prefix eval "COMPREPLY=( \"\${COMPREPLY[@]/#/${flag}=}\" )" fi fi fi return 0; ;; esac # check if we are handling a flag with special work handling local index __%[1]s_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 completions=("${commands[@]}") if [[ ${#must_have_one_noun[@]} -ne 0 ]]; then completions+=("${must_have_one_noun[@]}") elif [[ -n "${has_completion_function}" ]]; then # if a go completion function is provided, defer to that function __%[1]s_handle_go_custom_completion fi if [[ ${#must_have_one_flag[@]} -ne 0 ]]; then completions+=("${must_have_one_flag[@]}") fi while IFS='' read -r comp; do COMPREPLY+=("$comp") done < <(compgen -W "${completions[*]}" -- "$cur") if [[ ${#COMPREPLY[@]} -eq 0 && ${#noun_aliases[@]} -gt 0 && ${#must_have_one_noun[@]} -ne 0 ]]; then while IFS='' read -r comp; do COMPREPLY+=("$comp") done < <(compgen -W "${noun_aliases[*]}" -- "$cur") fi if [[ ${#COMPREPLY[@]} -eq 0 ]]; then if declare -F __%[1]s_custom_func >/dev/null; then # try command name qualified custom func __%[1]s_custom_func else # otherwise fall back to unqualified for compatibility declare -F __custom_func >/dev/null && __custom_func fi fi # available in bash-completion >= 2, not always present on macOS if declare -F __ltrim_colon_completions >/dev/null; then __ltrim_colon_completions "$cur" fi # If there is only 1 completion and it is a flag with an = it will be completed # but we don't want a space after the = if [[ "${#COMPREPLY[@]}" -eq "1" ]] && [[ $(type -t compopt) = "builtin" ]] && [[ "${COMPREPLY[0]}" == --*= ]]; then compopt -o nospace fi } # The arguments should be in the form "ext1|ext2|extn" __%[1]s_handle_filename_extension_flag() { local ext="$1" _filedir "@(${ext})" } __%[1]s_handle_subdirs_in_dir_flag() { local dir="$1" pushd "${dir}" >/dev/null 2>&1 && _filedir -d && popd >/dev/null 2>&1 || return } __%[1]s_handle_flag() { __%[1]s_debug "${FUNCNAME[0]}: 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 __%[1]s_debug "${FUNCNAME[0]}: looking for ${flagname}" if __%[1]s_contains_word "${flagname}" "${must_have_one_flag[@]}"; then must_have_one_flag=() fi # if you set a flag which only applies to this command, don't show subcommands if __%[1]s_contains_word "${flagname}" "${local_nonpersistent_flags[@]}"; then commands=() fi # keep flag value with flagname as flaghash # flaghash variable is an associative array which is only supported in bash > 3. if [[ -z "${BASH_VERSION}" || "${BASH_VERSINFO[0]}" -gt 3 ]]; then if [ -n "${flagvalue}" ] ; then flaghash[${flagname}]=${flagvalue} elif [ -n "${words[ $((c+1)) ]}" ] ; then flaghash[${flagname}]=${words[ $((c+1)) ]} else flaghash[${flagname}]="true" # pad "true" for bool flag fi fi # skip the argument to a two word flag if [[ ${words[c]} != *"="* ]] && __%[1]s_contains_word "${words[c]}" "${two_word_flags[@]}"; then __%[1]s_debug "${FUNCNAME[0]}: found a flag ${words[c]}, skip the next argument" c=$((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)) } __%[1]s_handle_noun() { __%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}" if __%[1]s_contains_word "${words[c]}" "${must_have_one_noun[@]}"; then must_have_one_noun=() elif __%[1]s_contains_word "${words[c]}" "${noun_aliases[@]}"; then must_have_one_noun=() fi nouns+=("${words[c]}") c=$((c+1)) } __%[1]s_handle_command() { __%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}" local next_command if [[ -n ${last_command} ]]; then next_command="_${last_command}_${words[c]//:/__}" else if [[ $c -eq 0 ]]; then next_command="_%[1]s_root_command" else next_command="_${words[c]//:/__}" fi fi c=$((c+1)) __%[1]s_debug "${FUNCNAME[0]}: looking for ${next_command}" declare -F "$next_command" >/dev/null && $next_command } __%[1]s_handle_word() { if [[ $c -ge $cword ]]; then __%[1]s_handle_reply return fi __%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}" if [[ "${words[c]}" == -* ]]; then __%[1]s_handle_flag elif __%[1]s_contains_word "${words[c]}" "${commands[@]}"; then __%[1]s_handle_command elif [[ $c -eq 0 ]]; then __%[1]s_handle_command elif __%[1]s_contains_word "${words[c]}" "${command_aliases[@]}"; then # aliashash variable is an associative array which is only supported in bash > 3. if [[ -z "${BASH_VERSION}" || "${BASH_VERSINFO[0]}" -gt 3 ]]; then words[c]=${aliashash[${words[c]}]} __%[1]s_handle_command else __%[1]s_handle_noun fi else __%[1]s_handle_noun fi __%[1]s_handle_word } `, name, ShellCompNoDescRequestCmd, ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp)) } func writePostscript(buf *bytes.Buffer, name string) { name = strings.Replace(name, ":", "__", -1) buf.WriteString(fmt.Sprintf("__start_%s()\n", name)) buf.WriteString(fmt.Sprintf(`{ local cur prev words cword declare -A flaghash 2>/dev/null || : declare -A aliashash 2>/dev/null || : if declare -F _init_completion >/dev/null 2>&1; then _init_completion -s || return else __%[1]s_init_completion -n "=" || return fi local c=0 local flags=() local two_word_flags=() local local_nonpersistent_flags=() local flags_with_completion=() local flags_completion=() local commands=("%[1]s") local must_have_one_flag=() local must_have_one_noun=() local has_completion_function local last_command local nouns=() __%[1]s_handle_word } `, name)) buf.WriteString(fmt.Sprintf(`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)) buf.WriteString("# ex: ts=4 sw=4 et filetype=sh\n") } func writeCommands(buf *bytes.Buffer, cmd *Command) { buf.WriteString(" commands=()\n") for _, c := range cmd.Commands() { if !c.IsAvailableCommand() || c == cmd.helpCommand { continue } buf.WriteString(fmt.Sprintf(" commands+=(%q)\n", c.Name())) writeCmdAliases(buf, c) } buf.WriteString("\n") } func writeFlagHandler(buf *bytes.Buffer, name string, annotations map[string][]string, cmd *Command) { for key, value := range annotations { switch key { case BashCompFilenameExt: buf.WriteString(fmt.Sprintf(" flags_with_completion+=(%q)\n", name)) var ext string if len(value) > 0 { ext = fmt.Sprintf("__%s_handle_filename_extension_flag ", cmd.Root().Name()) + strings.Join(value, "|") } else { ext = "_filedir" } buf.WriteString(fmt.Sprintf(" flags_completion+=(%q)\n", ext)) case BashCompCustom: buf.WriteString(fmt.Sprintf(" flags_with_completion+=(%q)\n", name)) if len(value) > 0 { handlers := strings.Join(value, "; ") buf.WriteString(fmt.Sprintf(" flags_completion+=(%q)\n", handlers)) } else { buf.WriteString(" flags_completion+=(:)\n") } case BashCompSubdirsInDir: buf.WriteString(fmt.Sprintf(" flags_with_completion+=(%q)\n", name)) var ext string if len(value) == 1 { ext = fmt.Sprintf("__%s_handle_subdirs_in_dir_flag ", cmd.Root().Name()) + value[0] } else { ext = "_filedir -d" } buf.WriteString(fmt.Sprintf(" flags_completion+=(%q)\n", ext)) } } } func writeShortFlag(buf *bytes.Buffer, flag *pflag.Flag, cmd *Command) { name := flag.Shorthand format := " " if len(flag.NoOptDefVal) == 0 { format += "two_word_" } format += "flags+=(\"-%s\")\n" buf.WriteString(fmt.Sprintf(format, name)) writeFlagHandler(buf, "-"+name, flag.Annotations, cmd) } func writeFlag(buf *bytes.Buffer, flag *pflag.Flag, cmd *Command) { name := flag.Name format := " flags+=(\"--%s" if len(flag.NoOptDefVal) == 0 { format += "=" } format += "\")\n" buf.WriteString(fmt.Sprintf(format, name)) if len(flag.NoOptDefVal) == 0 { format = " two_word_flags+=(\"--%s\")\n" buf.WriteString(fmt.Sprintf(format, name)) } writeFlagHandler(buf, "--"+name, flag.Annotations, cmd) } func writeLocalNonPersistentFlag(buf *bytes.Buffer, flag *pflag.Flag) { name := flag.Name format := " local_nonpersistent_flags+=(\"--%s" if len(flag.NoOptDefVal) == 0 { format += "=" } format += "\")\n" buf.WriteString(fmt.Sprintf(format, name)) } // Setup annotations for go completions for registered flags func prepareCustomAnnotationsForFlags(cmd *Command) { for flag := range flagCompletionFunctions { // Make sure the completion script calls the __*_go_custom_completion function for // every registered flag. We need to do this here (and not when the flag was registered // for completion) so that we can know the root command name for the prefix // of ___go_custom_completion if flag.Annotations == nil { flag.Annotations = map[string][]string{} } flag.Annotations[BashCompCustom] = []string{fmt.Sprintf("__%[1]s_handle_go_custom_completion", cmd.Root().Name())} } } func writeFlags(buf *bytes.Buffer, cmd *Command) { prepareCustomAnnotationsForFlags(cmd) buf.WriteString(` flags=() two_word_flags=() local_nonpersistent_flags=() flags_with_completion=() flags_completion=() `) localNonPersistentFlags := cmd.LocalNonPersistentFlags() cmd.NonInheritedFlags().VisitAll(func(flag *pflag.Flag) { if nonCompletableFlag(flag) { return } writeFlag(buf, flag, cmd) if len(flag.Shorthand) > 0 { writeShortFlag(buf, flag, cmd) } if localNonPersistentFlags.Lookup(flag.Name) != nil { writeLocalNonPersistentFlag(buf, flag) } }) cmd.InheritedFlags().VisitAll(func(flag *pflag.Flag) { if nonCompletableFlag(flag) { return } writeFlag(buf, flag, cmd) if len(flag.Shorthand) > 0 { writeShortFlag(buf, flag, cmd) } }) buf.WriteString("\n") } func writeRequiredFlag(buf *bytes.Buffer, cmd *Command) { buf.WriteString(" must_have_one_flag=()\n") flags := cmd.NonInheritedFlags() flags.VisitAll(func(flag *pflag.Flag) { if nonCompletableFlag(flag) { return } for key := range flag.Annotations { switch key { case BashCompOneRequiredFlag: format := " must_have_one_flag+=(\"--%s" if flag.Value.Type() != "bool" { format += "=" } format += "\")\n" buf.WriteString(fmt.Sprintf(format, flag.Name)) if len(flag.Shorthand) > 0 { buf.WriteString(fmt.Sprintf(" must_have_one_flag+=(\"-%s\")\n", flag.Shorthand)) } } } }) } func writeRequiredNouns(buf *bytes.Buffer, cmd *Command) { buf.WriteString(" must_have_one_noun=()\n") sort.Sort(sort.StringSlice(cmd.ValidArgs)) for _, value := range cmd.ValidArgs { // Remove any description that may be included following a tab character. // Descriptions are not supported by bash completion. value = strings.Split(value, "\t")[0] buf.WriteString(fmt.Sprintf(" must_have_one_noun+=(%q)\n", value)) } if cmd.ValidArgsFunction != nil { buf.WriteString(" has_completion_function=1\n") } } func writeCmdAliases(buf *bytes.Buffer, cmd *Command) { if len(cmd.Aliases) == 0 { return } sort.Sort(sort.StringSlice(cmd.Aliases)) buf.WriteString(fmt.Sprint(` if [[ -z "${BASH_VERSION}" || "${BASH_VERSINFO[0]}" -gt 3 ]]; then`, "\n")) for _, value := range cmd.Aliases { buf.WriteString(fmt.Sprintf(" command_aliases+=(%q)\n", value)) buf.WriteString(fmt.Sprintf(" aliashash[%q]=%q\n", value, cmd.Name())) } buf.WriteString(` fi`) buf.WriteString("\n") } func writeArgAliases(buf *bytes.Buffer, cmd *Command) { buf.WriteString(" noun_aliases=()\n") sort.Sort(sort.StringSlice(cmd.ArgAliases)) for _, value := range cmd.ArgAliases { buf.WriteString(fmt.Sprintf(" noun_aliases+=(%q)\n", value)) } } func gen(buf *bytes.Buffer, cmd *Command) { for _, c := range cmd.Commands() { if !c.IsAvailableCommand() || c == cmd.helpCommand { continue } gen(buf, c) } commandName := cmd.CommandPath() commandName = strings.Replace(commandName, " ", "_", -1) commandName = strings.Replace(commandName, ":", "__", -1) if cmd.Root() == cmd { buf.WriteString(fmt.Sprintf("_%s_root_command()\n{\n", commandName)) } else { buf.WriteString(fmt.Sprintf("_%s()\n{\n", commandName)) } buf.WriteString(fmt.Sprintf(" last_command=%q\n", commandName)) buf.WriteString("\n") buf.WriteString(" command_aliases=()\n") buf.WriteString("\n") writeCommands(buf, cmd) writeFlags(buf, cmd) writeRequiredFlag(buf, cmd) writeRequiredNouns(buf, cmd) writeArgAliases(buf, cmd) buf.WriteString("}\n\n") } // GenBashCompletion generates bash completion file and writes to the passed writer. func (c *Command) GenBashCompletion(w io.Writer) error { buf := new(bytes.Buffer) writePreamble(buf, c.Name()) if len(c.BashCompletionFunction) > 0 { buf.WriteString(c.BashCompletionFunction + "\n") } gen(buf, c) writePostscript(buf, c.Name()) _, err := buf.WriteTo(w) return err } func nonCompletableFlag(flag *pflag.Flag) bool { return flag.Hidden || len(flag.Deprecated) > 0 } // GenBashCompletionFile generates bash completion file. func (c *Command) GenBashCompletionFile(filename string) error { outFile, err := os.Create(filename) if err != nil { return err } defer outFile.Close() return c.GenBashCompletion(outFile) }