mirror of
https://github.com/spf13/cobra
synced 2024-11-05 05:17:12 +00:00
641 lines
19 KiB
Go
641 lines
19 KiB
Go
package cobra
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"sort"
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"strings"
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"github.com/spf13/pflag"
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)
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// Annotations for Bash completion.
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const (
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BashCompFilenameExt = "cobra_annotation_bash_completion_filename_extensions"
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BashCompCustom = "cobra_annotation_bash_completion_custom"
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BashCompOneRequiredFlag = "cobra_annotation_bash_completion_one_required_flag"
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BashCompSubdirsInDir = "cobra_annotation_bash_completion_subdirs_in_dir"
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)
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func writePreamble(buf *bytes.Buffer, name string) {
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buf.WriteString(fmt.Sprintf("# bash completion for %-36s -*- shell-script -*-\n", name))
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buf.WriteString(fmt.Sprintf(`
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__%[1]s_debug()
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{
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if [[ -n ${BASH_COMP_DEBUG_FILE} ]]; then
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echo "$*" >> "${BASH_COMP_DEBUG_FILE}"
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fi
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}
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# Homebrew on Macs have version 1.3 of bash-completion which doesn't include
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# _init_completion. This is a very minimal version of that function.
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__%[1]s_init_completion()
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{
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COMPREPLY=()
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_get_comp_words_by_ref "$@" cur prev words cword
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}
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__%[1]s_index_of_word()
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{
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local w word=$1
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shift
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index=0
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for w in "$@"; do
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[[ $w = "$word" ]] && return
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index=$((index+1))
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done
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index=-1
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}
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__%[1]s_contains_word()
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{
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local w word=$1; shift
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for w in "$@"; do
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[[ $w = "$word" ]] && return
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done
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return 1
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}
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__%[1]s_handle_go_custom_completion()
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{
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__%[1]s_debug "${FUNCNAME[0]}: cur is ${cur}, words[*] is ${words[*]}, #words[@] is ${#words[@]}"
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local out requestComp lastParam lastChar comp directive args
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# Prepare the command to request completions for the program.
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# Calling ${words[0]} instead of directly %[1]s allows to handle aliases
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args=("${words[@]:1}")
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requestComp="${words[0]} %[2]s ${args[*]}"
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lastParam=${words[$((${#words[@]}-1))]}
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lastChar=${lastParam:$((${#lastParam}-1)):1}
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__%[1]s_debug "${FUNCNAME[0]}: lastParam ${lastParam}, lastChar ${lastChar}"
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if [ -z "${cur}" ] && [ "${lastChar}" != "=" ]; then
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# If the last parameter is complete (there is a space following it)
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# We add an extra empty parameter so we can indicate this to the go method.
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__%[1]s_debug "${FUNCNAME[0]}: Adding extra empty parameter"
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requestComp="${requestComp} \"\""
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fi
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__%[1]s_debug "${FUNCNAME[0]}: calling ${requestComp}"
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# Use eval to handle any environment variables and such
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out=$(eval "${requestComp}" 2>/dev/null)
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# Extract the directive integer at the very end of the output following a colon (:)
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directive=${out##*:}
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# Remove the directive
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out=${out%%:*}
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if [ "${directive}" = "${out}" ]; then
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# There is not directive specified
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directive=0
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fi
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__%[1]s_debug "${FUNCNAME[0]}: the completion directive is: ${directive}"
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__%[1]s_debug "${FUNCNAME[0]}: the completions are: ${out[*]}"
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if [ $((directive & %[3]d)) -ne 0 ]; then
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# Error code. No completion.
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__%[1]s_debug "${FUNCNAME[0]}: received error from custom completion go code"
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return
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else
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if [ $((directive & %[4]d)) -ne 0 ]; then
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if [[ $(type -t compopt) = "builtin" ]]; then
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__%[1]s_debug "${FUNCNAME[0]}: activating no space"
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compopt -o nospace
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fi
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fi
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if [ $((directive & %[5]d)) -ne 0 ]; then
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if [[ $(type -t compopt) = "builtin" ]]; then
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__%[1]s_debug "${FUNCNAME[0]}: activating no file completion"
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compopt +o default
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fi
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fi
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while IFS='' read -r comp; do
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COMPREPLY+=("$comp")
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done < <(compgen -W "${out[*]}" -- "$cur")
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fi
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}
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__%[1]s_handle_reply()
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{
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__%[1]s_debug "${FUNCNAME[0]}"
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local comp
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case $cur in
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-*)
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if [[ $(type -t compopt) = "builtin" ]]; then
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compopt -o nospace
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fi
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local allflags
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if [ ${#must_have_one_flag[@]} -ne 0 ]; then
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allflags=("${must_have_one_flag[@]}")
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else
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allflags=("${flags[*]} ${two_word_flags[*]}")
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fi
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while IFS='' read -r comp; do
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COMPREPLY+=("$comp")
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done < <(compgen -W "${allflags[*]}" -- "$cur")
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if [[ $(type -t compopt) = "builtin" ]]; then
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[[ "${COMPREPLY[0]}" == *= ]] || compopt +o nospace
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fi
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# complete after --flag=abc
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if [[ $cur == *=* ]]; then
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if [[ $(type -t compopt) = "builtin" ]]; then
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compopt +o nospace
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fi
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local index flag
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flag="${cur%%=*}"
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__%[1]s_index_of_word "${flag}" "${flags_with_completion[@]}"
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COMPREPLY=()
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if [[ ${index} -ge 0 ]]; then
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PREFIX=""
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cur="${cur#*=}"
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${flags_completion[${index}]}
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if [ -n "${ZSH_VERSION}" ]; then
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# zsh completion needs --flag= prefix
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eval "COMPREPLY=( \"\${COMPREPLY[@]/#/${flag}=}\" )"
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fi
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fi
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fi
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return 0;
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;;
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esac
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# check if we are handling a flag with special work handling
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local index
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__%[1]s_index_of_word "${prev}" "${flags_with_completion[@]}"
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if [[ ${index} -ge 0 ]]; then
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${flags_completion[${index}]}
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return
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fi
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# we are parsing a flag and don't have a special handler, no completion
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if [[ ${cur} != "${words[cword]}" ]]; then
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return
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fi
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local completions
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completions=("${commands[@]}")
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if [[ ${#must_have_one_noun[@]} -ne 0 ]]; then
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completions=("${must_have_one_noun[@]}")
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elif [[ -n "${has_completion_function}" ]]; then
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# if a go completion function is provided, defer to that function
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completions=()
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__%[1]s_handle_go_custom_completion
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fi
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if [[ ${#must_have_one_flag[@]} -ne 0 ]]; then
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completions+=("${must_have_one_flag[@]}")
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fi
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while IFS='' read -r comp; do
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COMPREPLY+=("$comp")
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done < <(compgen -W "${completions[*]}" -- "$cur")
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if [[ ${#COMPREPLY[@]} -eq 0 && ${#noun_aliases[@]} -gt 0 && ${#must_have_one_noun[@]} -ne 0 ]]; then
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while IFS='' read -r comp; do
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COMPREPLY+=("$comp")
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done < <(compgen -W "${noun_aliases[*]}" -- "$cur")
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fi
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if [[ ${#COMPREPLY[@]} -eq 0 ]]; then
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if declare -F __%[1]s_custom_func >/dev/null; then
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# try command name qualified custom func
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__%[1]s_custom_func
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else
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# otherwise fall back to unqualified for compatibility
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declare -F __custom_func >/dev/null && __custom_func
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fi
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fi
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# available in bash-completion >= 2, not always present on macOS
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if declare -F __ltrim_colon_completions >/dev/null; then
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__ltrim_colon_completions "$cur"
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fi
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# If there is only 1 completion and it is a flag with an = it will be completed
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# but we don't want a space after the =
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if [[ "${#COMPREPLY[@]}" -eq "1" ]] && [[ $(type -t compopt) = "builtin" ]] && [[ "${COMPREPLY[0]}" == --*= ]]; then
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compopt -o nospace
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fi
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}
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# The arguments should be in the form "ext1|ext2|extn"
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__%[1]s_handle_filename_extension_flag()
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{
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local ext="$1"
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_filedir "@(${ext})"
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}
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__%[1]s_handle_subdirs_in_dir_flag()
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{
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local dir="$1"
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pushd "${dir}" >/dev/null 2>&1 && _filedir -d && popd >/dev/null 2>&1 || return
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}
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__%[1]s_handle_flag()
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{
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__%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
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# if a command required a flag, and we found it, unset must_have_one_flag()
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local flagname=${words[c]}
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local flagvalue
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# if the word contained an =
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if [[ ${words[c]} == *"="* ]]; then
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flagvalue=${flagname#*=} # take in as flagvalue after the =
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flagname=${flagname%%=*} # strip everything after the =
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flagname="${flagname}=" # but put the = back
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fi
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__%[1]s_debug "${FUNCNAME[0]}: looking for ${flagname}"
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if __%[1]s_contains_word "${flagname}" "${must_have_one_flag[@]}"; then
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must_have_one_flag=()
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fi
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# if you set a flag which only applies to this command, don't show subcommands
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if __%[1]s_contains_word "${flagname}" "${local_nonpersistent_flags[@]}"; then
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commands=()
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fi
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# keep flag value with flagname as flaghash
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# flaghash variable is an associative array which is only supported in bash > 3.
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if [[ -z "${BASH_VERSION}" || "${BASH_VERSINFO[0]}" -gt 3 ]]; then
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if [ -n "${flagvalue}" ] ; then
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flaghash[${flagname}]=${flagvalue}
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elif [ -n "${words[ $((c+1)) ]}" ] ; then
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flaghash[${flagname}]=${words[ $((c+1)) ]}
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else
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flaghash[${flagname}]="true" # pad "true" for bool flag
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fi
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fi
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# skip the argument to a two word flag
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if [[ ${words[c]} != *"="* ]] && __%[1]s_contains_word "${words[c]}" "${two_word_flags[@]}"; then
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__%[1]s_debug "${FUNCNAME[0]}: found a flag ${words[c]}, skip the next argument"
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c=$((c+1))
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# if we are looking for a flags value, don't show commands
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if [[ $c -eq $cword ]]; then
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commands=()
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fi
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fi
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c=$((c+1))
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}
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__%[1]s_handle_noun()
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{
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__%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
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if __%[1]s_contains_word "${words[c]}" "${must_have_one_noun[@]}"; then
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must_have_one_noun=()
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elif __%[1]s_contains_word "${words[c]}" "${noun_aliases[@]}"; then
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must_have_one_noun=()
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fi
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nouns+=("${words[c]}")
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c=$((c+1))
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}
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__%[1]s_handle_command()
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{
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__%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
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local next_command
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if [[ -n ${last_command} ]]; then
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next_command="_${last_command}_${words[c]//:/__}"
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else
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if [[ $c -eq 0 ]]; then
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next_command="_%[1]s_root_command"
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else
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next_command="_${words[c]//:/__}"
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fi
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fi
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c=$((c+1))
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__%[1]s_debug "${FUNCNAME[0]}: looking for ${next_command}"
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declare -F "$next_command" >/dev/null && $next_command
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}
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__%[1]s_handle_word()
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{
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if [[ $c -ge $cword ]]; then
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__%[1]s_handle_reply
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return
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fi
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__%[1]s_debug "${FUNCNAME[0]}: c is $c words[c] is ${words[c]}"
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if [[ "${words[c]}" == -* ]]; then
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__%[1]s_handle_flag
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elif __%[1]s_contains_word "${words[c]}" "${commands[@]}"; then
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__%[1]s_handle_command
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elif [[ $c -eq 0 ]]; then
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__%[1]s_handle_command
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elif __%[1]s_contains_word "${words[c]}" "${command_aliases[@]}"; then
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# aliashash variable is an associative array which is only supported in bash > 3.
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if [[ -z "${BASH_VERSION}" || "${BASH_VERSINFO[0]}" -gt 3 ]]; then
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words[c]=${aliashash[${words[c]}]}
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__%[1]s_handle_command
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else
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__%[1]s_handle_noun
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fi
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else
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__%[1]s_handle_noun
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fi
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__%[1]s_handle_word
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}
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`, name, ShellCompNoDescRequestCmd, ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp))
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}
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func writePostscript(buf *bytes.Buffer, name string) {
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name = strings.Replace(name, ":", "__", -1)
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buf.WriteString(fmt.Sprintf("__start_%s()\n", name))
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buf.WriteString(fmt.Sprintf(`{
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local cur prev words cword
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declare -A flaghash 2>/dev/null || :
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declare -A aliashash 2>/dev/null || :
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if declare -F _init_completion >/dev/null 2>&1; then
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_init_completion -s || return
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else
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__%[1]s_init_completion -n "=" || return
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fi
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local c=0
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local flags=()
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local two_word_flags=()
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local local_nonpersistent_flags=()
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local flags_with_completion=()
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local flags_completion=()
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local commands=("%[1]s")
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local must_have_one_flag=()
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local must_have_one_noun=()
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local has_completion_function
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local last_command
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local nouns=()
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__%[1]s_handle_word
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}
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`, name))
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buf.WriteString(fmt.Sprintf(`if [[ $(type -t compopt) = "builtin" ]]; then
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complete -o default -F __start_%s %s
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else
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complete -o default -o nospace -F __start_%s %s
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fi
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`, name, name, name, name))
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buf.WriteString("# ex: ts=4 sw=4 et filetype=sh\n")
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}
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func writeCommands(buf *bytes.Buffer, cmd *Command) {
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buf.WriteString(" commands=()\n")
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for _, c := range cmd.Commands() {
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if !c.IsAvailableCommand() || c == cmd.helpCommand {
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continue
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}
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buf.WriteString(fmt.Sprintf(" commands+=(%q)\n", c.Name()))
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writeCmdAliases(buf, c)
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}
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buf.WriteString("\n")
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}
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func writeFlagHandler(buf *bytes.Buffer, name string, annotations map[string][]string, cmd *Command) {
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for key, value := range annotations {
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switch key {
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case BashCompFilenameExt:
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buf.WriteString(fmt.Sprintf(" flags_with_completion+=(%q)\n", name))
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var ext string
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if len(value) > 0 {
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ext = fmt.Sprintf("__%s_handle_filename_extension_flag ", cmd.Root().Name()) + strings.Join(value, "|")
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} else {
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ext = "_filedir"
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}
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buf.WriteString(fmt.Sprintf(" flags_completion+=(%q)\n", ext))
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case BashCompCustom:
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buf.WriteString(fmt.Sprintf(" flags_with_completion+=(%q)\n", name))
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if len(value) > 0 {
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handlers := strings.Join(value, "; ")
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buf.WriteString(fmt.Sprintf(" flags_completion+=(%q)\n", handlers))
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} else {
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buf.WriteString(" flags_completion+=(:)\n")
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}
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case BashCompSubdirsInDir:
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buf.WriteString(fmt.Sprintf(" flags_with_completion+=(%q)\n", name))
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var ext string
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if len(value) == 1 {
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ext = fmt.Sprintf("__%s_handle_subdirs_in_dir_flag ", cmd.Root().Name()) + value[0]
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} else {
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ext = "_filedir -d"
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}
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buf.WriteString(fmt.Sprintf(" flags_completion+=(%q)\n", ext))
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}
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}
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}
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func writeShortFlag(buf *bytes.Buffer, flag *pflag.Flag, cmd *Command) {
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name := flag.Shorthand
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format := " "
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if len(flag.NoOptDefVal) == 0 {
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format += "two_word_"
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}
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format += "flags+=(\"-%s\")\n"
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buf.WriteString(fmt.Sprintf(format, name))
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writeFlagHandler(buf, "-"+name, flag.Annotations, cmd)
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}
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func writeFlag(buf *bytes.Buffer, flag *pflag.Flag, cmd *Command) {
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name := flag.Name
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format := " flags+=(\"--%s"
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if len(flag.NoOptDefVal) == 0 {
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format += "="
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}
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format += "\")\n"
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buf.WriteString(fmt.Sprintf(format, name))
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if len(flag.NoOptDefVal) == 0 {
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format = " two_word_flags+=(\"--%s\")\n"
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buf.WriteString(fmt.Sprintf(format, name))
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}
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writeFlagHandler(buf, "--"+name, flag.Annotations, cmd)
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}
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func writeLocalNonPersistentFlag(buf *bytes.Buffer, flag *pflag.Flag) {
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name := flag.Name
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format := " local_nonpersistent_flags+=(\"--%s"
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if len(flag.NoOptDefVal) == 0 {
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format += "="
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}
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format += "\")\n"
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buf.WriteString(fmt.Sprintf(format, name))
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}
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// Setup annotations for go completions for registered flags
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func prepareCustomAnnotationsForFlags(cmd *Command) {
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for flag := range flagCompletionFunctions {
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// Make sure the completion script calls the __*_go_custom_completion function for
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// every registered flag. We need to do this here (and not when the flag was registered
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// for completion) so that we can know the root command name for the prefix
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// of __<prefix>_go_custom_completion
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if flag.Annotations == nil {
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flag.Annotations = map[string][]string{}
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|
}
|
|
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)
|
|
}
|