109 lines
2.6 KiB
Bash
109 lines
2.6 KiB
Bash
#!/bin/bash
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# from SO: https://stackoverflow.com/a/54261882/317605 (by https://stackoverflow.com/users/8207842/dols3m)
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function multiselect() {
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# little helpers for terminal print control and key input
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ESC=$(printf "\033")
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cursor_blink_on() { printf "$ESC[?25h"; }
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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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print_inactive() { printf "$2 $1 "; }
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print_active() { printf "$2 $ESC[7m $1 $ESC[27m"; }
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get_cursor_row() {
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IFS=';' read -sdR -p $'\E[6n' ROW COL
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echo ${ROW#*[}
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}
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key_input() {
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local key
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IFS= read -rsn1 key 2>/dev/null >&2
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if [[ $key = "" ]]; then echo enter; fi
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if [[ $key = $'\x20' ]]; then echo space; fi
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if [[ $key = $'\x1b' ]]; then
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read -rsn2 key
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if [[ $key = [A ]]; then echo up; fi
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if [[ $key = [B ]]; then echo down; fi
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fi
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}
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toggle_option() {
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local arr_name=$1
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eval "local arr=(\"\${${arr_name}[@]}\")"
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local option=$2
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if [[ ${arr[option]} == true ]]; then
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arr[option]=
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else
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arr[option]=true
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fi
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eval $arr_name='("${arr[@]}")'
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}
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local retval=$1
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local options
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local defaults
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IFS=';' read -r -a options <<<"$2"
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if [[ -z $3 ]]; then
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defaults=()
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else
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IFS=';' read -r -a defaults <<<"$3"
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fi
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local selected=()
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for ((i = 0; i < ${#options[@]}; i++)); do
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selected+=("${defaults[i]:-false}")
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printf "\n"
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done
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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 - ${#options[@]}))
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# ensure cursor and input echoing back on upon a ctrl+c during read -s
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trap "cursor_blink_on; stty echo; printf '\n'; exit" 2
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cursor_blink_off
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local active=0
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while true; do
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# print options by overwriting the last lines
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local idx=0
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for option in "${options[@]}"; do
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local prefix=" [ ]"
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if [[ ${selected[idx]} == true ]]; then
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prefix=" [x]"
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fi
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cursor_to $(($startrow + $idx))
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if [ $idx -eq $active ]; then
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print_active "$option" "$prefix"
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else
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print_inactive "$option" "$prefix"
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fi
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((idx++))
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done
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# user key control
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case $(key_input) in
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space) toggle_option selected $active ;;
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enter) break ;;
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up)
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((active--))
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if [ $active -lt 0 ]; then active=$((${#options[@]} - 1)); fi
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;;
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down)
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((active++))
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if [ $active -ge ${#options[@]} ]; then active=0; fi
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;;
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esac
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done
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# cursor position back to normal
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cursor_to $lastrow
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printf "\n"
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cursor_blink_on
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eval $retval='("${selected[@]}")'
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}
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[[ "${1}" != "--source-only" ]] && multiselect "${@}"
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