multiple selection choocer
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q
@@ -1,22 +1,16 @@
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#!/usr/bin/env bash
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# Renders a text based list of options that can be selected by the
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# user using up, down and enter keys and returns the chosen option.
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#
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# Arguments : list of options, maximum of 256
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# "opt1" "opt2" ...
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# Return value: selected index (0 for opt1, 1 for opt2 ...)
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function select_option {
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local nformat
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local optcount=$#
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printf -v nformat "%%%dd. " ${#optcount}
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local max_opt=0
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local multiselected=()
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for opt; do
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if [[ "${#opt}" -gt $max_opt ]]; then
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max_opt=${#opt}
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fi
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multiselected+=(0)
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done
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# little helpers for terminal print control and key input
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@@ -25,11 +19,13 @@ function select_option {
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cursor_blink_off() { printf "$ESC[?25l"; }
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cursor_to() { printf "$ESC[$1;${2:-1}H"; }
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if [[ $SELECT_MONOCHROME -eq 1 ]]; then
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print_option() { printf " $1 "; }
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print_selected() { printf " [$ESC[1m$1$ESC[0m] "; }
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print_option() { printf " $ESC[30m%s $ESC[0m %s $ESC[30m%s$ESC[0m " "$2" "$1" "$3"; }
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print_selected() { printf " $ESC[30m%s$ESC[0m{ $ESC[1m%s$ESC[0m }$ESC[30m%s$ESC[0m " "$2" "$1" "$3"; }
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print_multiselected() { printf "$ESC[30;1m*$ESC[0m"; }
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else
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print_option() { printf " $ESC[33m $1 $ESC[0m "; }
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print_selected() { printf " [$ESC[37;1m$1$ESC[0m] "; }
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print_option() { printf " $ESC[30m%s $ESC[33m %s $ESC[0m $ESC[30m%s$ESC[0m " "$2" "$1" "$3"; }
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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" "$3"; }
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print_multiselected() { printf "$ESC[32;1m*$ESC[0m"; }
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fi
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get_cursor_row() { IFS=';' read -sdR -p $'\E[6n' ROW COL; echo ${ROW#*[}; }
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key_input() { read -s -n1 key1 2>/dev/null >&2
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@@ -39,7 +35,11 @@ function select_option {
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fi
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if [[ $key1$key2 = $ESC[A ]]; then echo up; return; fi
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if [[ $key1$key2 = $ESC[B ]]; then echo down; return; fi
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if [[ $key1$key2 = $ESC[C ]]; then echo left; return; fi
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if [[ $key1$key2 = $ESC[D ]]; then echo right; return; fi
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if [[ $key1 = $'\e' ]]; then echo esc; return; fi
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if [[ $key1 = x ]]; then echo multiselect; return; fi
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if [[ $key1 = q ]]; then echo esc; return; fi
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if [[ $key1 = "" ]]; then echo enter; return; fi
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}
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reset_display() {
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@@ -47,22 +47,35 @@ function select_option {
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}
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# initially print empty new lines (scroll down if at bottom of screen)
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for opt; do printf "\n"; done
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# Extras for top and bottom
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printf "\n\n"
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# determine current screen position for overwriting the options
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local lastrow=`get_cursor_row`
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local startrow=$(($lastrow - $#))
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local startrow=$(( $lastrow - $# - 2 ))
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local toprow="+~~--"
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local bottomrow="--~~+"
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local lborderchars="|:'"
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local rborderchars="|:."
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# ensure cursor and input echoing back on upon a ctrl+c during read -s
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trap "cursor_blink_on; stty echo; printf '\n'; exit 1" 2
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cursor_blink_off
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local selected=0
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while true; do
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# print options by overwriting the last lines
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local idx=0
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local nidx
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cursor_to $startrow
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printf " $ESC[30m%s$ESC[0m" "$toprow"
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for opt; do
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local lborder="${lborderchars:$idx:1}"
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if [ -z "$lborder" ]; then lborder=" "; fi
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local rborder="${rborderchars:$(( $optcount - $idx - 1)):1}"
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if [ -z "$rborder" ]; then rborder=" "; fi
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if [[ $SELECT_UNDERSCORES -eq 1 ]]; then
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opt=${opt//_/ }
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fi
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@@ -70,14 +83,21 @@ function select_option {
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printf -v nidx "$nformat" $(( idx + 1 ))
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fi
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printf -v padopt "%-${max_opt}s" "$opt"
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cursor_to $(($startrow + $idx))
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cursor_to $(($startrow + $idx + 1))
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if [ $idx -eq $selected ]; then
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print_selected "$nidx$padopt"
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print_selected "$nidx$padopt" "$lborder" "$rborder"
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else
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print_option "$nidx$padopt"
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print_option "$nidx$padopt" "${lborder}" "$rborder"
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fi
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if (( ${multiselected[$idx]} )); then
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cursor_to $(($startrow + $idx + 1)) 5
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print_multiselected
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fi
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((idx++))
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done
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cursor_to $(($startrow + $idx + 1))
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local bottomlength=$(( 8 + $max_opt + ${#nidx} ))
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printf "$ESC[30m%${bottomlength}s$ESC[0m" "$bottomrow"
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# user key control
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local user_input=`key_input`
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@@ -88,6 +108,7 @@ function select_option {
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if [ $selected -lt 0 ]; then selected=$(($# - 1)); fi;;
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down) ((selected++));
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if [ $selected -ge $# ]; then selected=0; fi;;
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multiselect) if (( $SELECT_MULTI )); then multiselected[$selected]=$(( 1 - ${multiselected[$selected]} )); fi;;
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[0-9]) selected=$(( $user_input - 1 )) ;;
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esac
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done
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@@ -95,8 +116,21 @@ function select_option {
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# cursor position back to normal
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cursor_to $lastrow
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reset_display
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if [[ -n "$SELECT_TOFILE" ]]; then
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local returnvalue=0
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local idx=0
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if (( $SELECT_MULTI )); then
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if [[ -n "$SELECT_TOFILE" ]]; then printf "" > "$SELECT_TOFILE"; fi
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for opt; do
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if (( ${multiselected[$idx]} )); then
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if [[ -n "$SELECT_TOFILE" ]]; then echo "$opt" >> "$SELECT_TOFILE"; fi
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returnvalue=$(( $returnvalue + 2**$idx ))
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fi
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((idx++))
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done
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else
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# Single choice
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returnvalue=$selected
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if [[ -n "$SELECT_TOFILE" ]]; then
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for opt; do
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if [ $idx -eq $selected ]; then
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echo "$opt" > "$SELECT_TOFILE"
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@@ -104,28 +138,55 @@ function select_option {
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((idx++))
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done
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fi
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return $(( 10 + $selected ))
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fi
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return $(( $returnvalue + 10 ))
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}
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[[ $_ == $0 ]] && {
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_help() {
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SELF=$( basename "$0" )
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echo "Select Option
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echo "Select Option [Pure BASH]
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Adapted from: https://unix.stackexchange.com/questions/146570/arrow-key-enter-menu
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Usage: $SELF [-n] [--nc] [-o File] [-_] list of options
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-n Number list
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-n Numbered list
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-m Multiple choice selection. Note that only 7 options can be encoded
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reliably in return value. Use File output for more options.
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--nc No colors
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-o File Save the choice in a file
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-_ Print spaces instead of underscores
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-o File Save the choice(s) in a file.
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-_ Print spaces instead of underscores, workaround for
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shell arguments with spaces.
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Returns
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User interface:
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Enter Select option
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Esc / Ctrl-c Exit
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x Multi-selection
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Returns:
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Single selection:
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(10 + index) of selection (first option = 10)
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1 if ctrl-c or ESC pressed
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If output file is defined, choice is printed there.
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Multiple selection:
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(10 + 2**index) encoded multiple values (no options = 10). See example.
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1 if ctrl-c or ESC pressed
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All choices separately in the output File.
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Example:
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Single choice:
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$SELF -n one two three
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EC=\$?
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[[ \$EC -lt 10 ]] && { echo Exited..; } || { echo You selected \$(( \$EC - 9 )); }
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Multi choice:
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$SELF -m one two three four five six seven -o choice.txt
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C=\$?; C=\$(( \$C - 10 ))
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if (( \$C == 0 )); then printf 'No selection'; else printf 'Selections: '; fi
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for b in 7 6 5 4 3 2 1 0; do
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if (( \$C >= 2**\$b )); then printf '%d, ' \$(( \$b + 1 )); C=\$(( \$C - 2**\$b )); fi
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done; printf '\\n'
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"
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exit
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}
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@@ -133,6 +194,7 @@ _help() {
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SELECT_MONOCHROME=0
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SELECT_NUMBERS=0
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SELECT_UNDERSCORES=0
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SELECT_MULTI=0
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SELECT_TOFILE=""
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for (( i=1; i<=$#; i++ )); do
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value=${!i}
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@@ -140,6 +202,7 @@ for (( i=1; i<=$#; i++ )); do
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[[ "$value" = "-h" ]] && _help
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[[ "$value" = "--help" ]] && _help
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[[ "$value" = "--nc" ]] && { SELECT_MONOCHROME=1; continue; }
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[[ "$value" = "-m" ]] && { SELECT_MULTI=1; continue; }
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[[ "$value" = "-n" ]] && { SELECT_NUMBERS=1; continue; }
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[[ "$value" = "-_" ]] && { SELECT_UNDERSCORES=1; continue; }
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[[ "$value" = "-o" ]] && { SELECT_TOFILE="${!j}"; ((i++)); continue; }
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