#!/usr/bin/env bash ## Function start function select_option { local nformat local optcount=$# printf -v nformat "%%%dd. " ${#optcount} local max_opt=0 local multiselected=() for opt; do if [[ "${#opt}" -gt $max_opt ]]; then max_opt=${#opt} fi multiselected+=(0) done # little helpers for terminal print control and key input ESC=$( printf "\033") cursor_blink_on() { printf "$ESC[?25h"; } cursor_blink_off() { printf "$ESC[?25l"; } cursor_to() { printf "$ESC[$1;${2:-1}H"; } if [[ $SELECT_MONOCHROME -eq 1 ]]; then print_option() { printf " $ESC[30m%s $ESC[0m %s $ESC[30m%s$ESC[0m " "$2" "$1" "$3"; } print_selected() { printf " $ESC[30m%s$ESC[0m{ $ESC[1m%s$ESC[0m }$ESC[30m%s$ESC[0m " "$2" "$1" "$3"; } print_multiselected() { printf "$ESC[30;1m*$ESC[0m"; } else print_option() { printf " $ESC[30m%s $ESC[33m %s $ESC[0m $ESC[30m%s$ESC[0m " "$2" "$1" "$3"; } print_selected() { printf " $ESC[30m%s$ESC[35;1m{$ESC[37;1m %s $ESC[0;35;1m}$ESC[0;30m%s$ESC[0m " "$2" "$1" "$3"; } print_multiselected() { printf "$ESC[32;1m*$ESC[0m"; } fi get_cursor_row() { IFS=';' read -sdR -p $'\E[6n' ROW COL; echo ${ROW#*[}; } key_input() { read -s -n1 key1 2>/dev/null >&2 read -s -n2 -t 0.1 key2 2>/dev/null >&2 if [[ "$key1" =~ ^[0-9]+$ ]]; then echo $key1; return; fi if [[ $key1$key2 = $ESC[A ]]; then echo up; return; fi if [[ $key1$key2 = $ESC[B ]]; then echo down; return; fi if [[ $key1$key2 = $ESC[C ]]; then echo left; return; fi if [[ $key1$key2 = $ESC[D ]]; then echo right; return; fi if [[ $key1 = $'\e' ]]; then echo esc; return; fi if [[ $key1 = x ]]; then echo multiselect; return; fi if [[ $key1 = q ]]; then echo esc; return; fi if [[ $key1 = "" ]]; then echo enter; return; fi } reset_display() { cursor_blink_on; stty echo; printf '\n'; } # initially print empty new lines (scroll down if at bottom of screen) for opt; do printf "\n"; done # Extras for top and bottom printf "\n\n" # determine current screen position for overwriting the options local lastrow=`get_cursor_row` local startrow=$(( $lastrow - $# - 2 )) local toprow="+~~--" local bottomrow="--~~+" local lborderchars="|:'" local rborderchars="|:." # ensure cursor and input echoing back on upon a ctrl+c during read -s trap "cursor_blink_on; stty echo; printf '\n'; exit 1" 2 cursor_blink_off local selected=0 while true; do # print options by overwriting the last lines local idx=0 local nidx cursor_to $startrow printf " $ESC[30m%s$ESC[0m" "$toprow" for opt; do local lborder="${lborderchars:$idx:1}" if [ -z "$lborder" ]; then lborder=" "; fi local rborder="${rborderchars:$(( $optcount - $idx - 1)):1}" if [ -z "$rborder" ]; then rborder=" "; fi if [[ $SELECT_UNDERSCORES -eq 1 ]]; then opt=${opt//_/ } fi if [[ $SELECT_NUMBERS -eq 1 ]]; then printf -v nidx "$nformat" $(( idx + 1 )) fi printf -v padopt "%-${max_opt}s" "$opt" cursor_to $(($startrow + $idx + 1)) if [ $idx -eq $selected ]; then print_selected "$nidx$padopt" "$lborder" "$rborder" else print_option "$nidx$padopt" "${lborder}" "$rborder" fi if (( ${multiselected[$idx]} )); then cursor_to $(($startrow + $idx + 1)) 5 print_multiselected fi ((idx++)) done cursor_to $(($startrow + $idx + 1)) local bottomlength=$(( 8 + $max_opt + ${#nidx} )) printf "$ESC[30m%${bottomlength}s$ESC[0m" "$bottomrow" # user key control local user_input=`key_input` case "$user_input" in enter) break;; esc) reset_display; exit 1;; up) ((selected--)); if [ $selected -lt 0 ]; then selected=$(($# - 1)); fi;; down) ((selected++)); if [ $selected -ge $# ]; then selected=0; fi;; multiselect) if (( $SELECT_MULTI )); then multiselected[$selected]=$(( 1 - ${multiselected[$selected]} )); fi;; [0-9]) selected=$(( $user_input - 1 )) ;; esac done # cursor position back to normal cursor_to $lastrow reset_display local returnvalue=0 local idx=0 if (( $SELECT_MULTI )); then if [[ -n "$SELECT_TOFILE" ]]; then printf "" > "$SELECT_TOFILE"; fi for opt; do if (( ${multiselected[$idx]} )); then if [[ -n "$SELECT_TOFILE" ]]; then echo "$opt" >> "$SELECT_TOFILE"; fi returnvalue=$(( $returnvalue + 2**$idx )) fi ((idx++)) done else # Single choice returnvalue=$selected if [[ -n "$SELECT_TOFILE" ]]; then for opt; do if [ $idx -eq $selected ]; then echo "$opt" > "$SELECT_TOFILE" fi ((idx++)) done fi fi return $(( $returnvalue + 10 )) } ## Function end [[ $_ == $0 ]] && { _help() { SELF=$( basename "$0" ) echo "Select Option [Pure BASH] Adapted from: https://unix.stackexchange.com/questions/146570/arrow-key-enter-menu Usage: $SELF [-n] [--nc] [-o File] [-_] list of options -n Numbered list -m Multiple choice selection. Note that only 7 options can be encoded reliably in return value. Use File output for more options. --nc No colors -o File Save the choice(s) in a file. -_ Print spaces instead of underscores, workaround for shell arguments with spaces. User interface: Enter Select option Esc / Ctrl-c Exit x Multi-selection Returns: Single selection: (10 + index) of selection (first option = 10) 1 if ctrl-c or ESC pressed If output file is defined, choice is printed there. Multiple selection: (10 + 2**index) encoded multiple values (no options = 10). See example. 1 if ctrl-c or ESC pressed All choices separately in the output File. Example: Single choice: $SELF -n one two three EC=\$? [[ \$EC -lt 10 ]] && { echo Exited..; } || { echo You selected \$(( \$EC - 9 )); } Multi choice: $SELF -m one two three four five six seven -o choice.txt C=\$?; C=\$(( \$C - 10 )) if (( \$C == 0 )); then printf 'No selection'; else printf 'Selections: '; fi for b in 7 6 5 4 3 2 1 0; do if (( \$C >= 2**\$b )); then printf '%d, ' \$(( \$b + 1 )); C=\$(( \$C - 2**\$b )); fi done; printf '\\n' " exit } _package_self() { grep ^SELECT_ "$0" printf "source <( echo '" awk '/^## Function start/{flag=1;next}/^## Function end/{flag=0}flag' "$0" | \ base64 -w 0 printf "' | base64 -d )\n" printf 'select_option one two three || choice=$(( $? - 9 ))\n' } SELECT_MONOCHROME=0 SELECT_NUMBERS=0 SELECT_UNDERSCORES=0 SELECT_MULTI=0 SELECT_TOFILE="" for (( i=1; i<=$#; i++ )); do value=${!i} j=$(( i + 1 )) [[ "$value" = "-h" ]] && _help [[ "$value" = "--help" ]] && _help [[ "$value" = "--nc" ]] && { SELECT_MONOCHROME=1; continue; } [[ "$value" = "-m" ]] && { SELECT_MULTI=1; continue; } [[ "$value" = "-n" ]] && { SELECT_NUMBERS=1; continue; } [[ "$value" = "-_" ]] && { SELECT_UNDERSCORES=1; continue; } [[ "$value" = "-o" ]] && { SELECT_TOFILE="${!j}"; ((i++)); continue; } [[ "$value" = "--package" ]] && { _package_self; exit; } opts+=( "$value" ) done select_option "${opts[@]}" exit $? }