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lib/interact.bash
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287
lib/interact.bash
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#!/usr/bin/env bash
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# _
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# | | _ _
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# | |____ _| |_ _____ ____ _____ ____ _| |_
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# | | _ (_ _) ___ |/ ___|____ |/ ___|_ _)
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# | | | | || |_| ____| | / ___ ( (___ | |_
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# |_|_| |_| \__)_____)_| \_____|\____) \__)
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#
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# Bash powered interactive interfaces.
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#
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# Interact is Bash functions library that implements some
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# interactive elements like menus, checkboxes and others.
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# You can use Interact instead of Whiptail and Dialog.
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# Interact depends only Bash native commands and basic utils.
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menu() {
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# Interactive menu
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#
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# Return string SELECTED_ITEM from array.
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# Array must be passed as argument.
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#
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# Variables:
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# MENU_PROMPT -- string with prompt message;
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# MENU_INDENT -- string with intentation chars;
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# MENU_HELP -- string with help message.
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local menu_items=("$@") # array of items
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local inp= # reset input
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local pos=0 # initial cursor position
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tput smcup # save screen contents
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tput civis # hide cursor
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while [[ ! "$inp" =~ [qQ] ]]; do
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clear # clear screen
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if [ "$MENU_PROMPT" ]
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then echo -e "$MENU_PROMPT"
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else echo -e "Select item:\n"
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fi
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# Print menu items
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for i in "${!menu_items[@]}"; do
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[ "$MENU_INDENT" ] && echo -en "$MENU_INDENT"
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# Highlight selected item (invert colors)
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if [ $i -eq $pos ]
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then echo -e "> \e[7m${menu_items[${i}]}\e[27m"
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else echo -e " ${menu_items[${i}]}"
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fi
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done
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# Print help text
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if [ ! "$MENU_HELP" ]; then
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tput cup $(tput lines) 0
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echo -en \
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"\e[7mUse HJKL or arrow keys to move, Enter to select, q to quit\e[27m"
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tput home
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else echo -e "$MENU_HELP"
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fi
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# Read input (including arrow keys)
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inp=
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local escape_char=$(printf "\u1b")
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read -r -s -n 1 inp # get 1 character
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# Read 2 more chars
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if [[ $inp == $escape_char ]]; then read -r -s -n 2 inp; fi
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case "$inp" in
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[[hHjJ]|'[A'|'[D' ) pos=$(( $pos - 1 )) ;; # move up
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[]kKlL]|'[B'|'[C' ) pos=$(( $pos + 1 )) ;; # move down
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'' ) SELECTED_ITEM="${menu_items[${pos}]}"; break ;; # enter
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esac
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# Jump to last item if user press "up" when pos=0 and vice versa
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if [ $pos -lt 0 ]; then pos=$(( ${#menu_items[@]} - 1 )); fi
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if [ $pos -gt $(( ${#menu_items[@]} - 1 )) ]; then pos=0; fi
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done
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tput rmcup # restore screen contents
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tput cnorm # show terminal cursor
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}
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checklist() {
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# Interactive checklist
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#
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# Return string CHECKED_ITEMS from array.
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# Array must be passed as argument.
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#
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# Variables:
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# CHECK_PROMPT -- string with prompt message;
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# CHECK_INDENT -- string with intentation chars;
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# CHECK_HELP -- string with help message.
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local checklist_items=("$@") # array of items
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local inp= # reset input
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local pos=0 # initial cursor position
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tput smcup # save screen contents
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tput civis # hide terminal cursor
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while [[ ! "$inp" =~ [qQ] ]]; do
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clear # clear screen
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if [ "$CHECK_PROMPT" ]
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then echo -e "$CHECK_PROMPT"
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else echo -e "Check items:\n"
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fi
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# Print menu items
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for i in "${!checklist_items[@]}"; do
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[ "$CHECK_INDENT" ] && echo -en "$CHECK_INDENT"
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if [[ "${checked[@]}" =~ "${checklist_items[${i}]}" ]]
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then marker="[x] "
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else marker="[ ] "
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fi
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# Highlight selected item (invert colors)
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if [ $i -eq $pos ]
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then echo -e "> \e[7m${marker}${checklist_items[${i}]}\e[27m"
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else echo -e " ${marker}${checklist_items[${i}]}"
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fi
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done
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# Print help text
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if [ ! "$CHECK_HELP" ]; then
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tput cup $(tput lines) 0
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echo -en \
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"\e[7mUse HJKL or arrow keys to move, Enter to check, q to quit\e[27m"
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tput home
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else echo -e "$CHECK_HELP"
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fi
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# Read input (including arrow keys)
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inp=
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local escape_char=$(printf "\u1b")
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read -r -s -n 1 inp # get 1 character
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# Read 2 more chars
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if [[ $inp == $escape_char ]]; then read -r -s -n 2 inp; fi
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case "$inp" in
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[[hHjJ]|'[A'|'[D' ) pos=$(( $pos - 1 )) ;; # move up
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[]kKlL]|'[B'|'[C' ) pos=$(( $pos + 1 )) ;; # move down
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'' )
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# Check / uncheck items
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if [[ "${checked[@]}" =~ "${checklist_items[${pos}]}" ]]
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then
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# Uncheck item
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checked=( "${checked[@]/${checklist_items[${pos}]}}" )
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else
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# Check new item
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checked+=("${checklist_items[${pos}]}")
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fi
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# Automove cursor
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[ $pos -lt $(( ${#checklist_items[@]} - 1 )) ] \
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&& pos=$(( $pos + 1 ));;
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esac
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# Jump to last item if user press "up" when pos=0 and vice versa
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if [ $pos -lt 0 ]; then pos=$(( ${#checklist_items[@]} - 1 )); fi
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if [ $pos -gt $(( ${#checklist_items[@]} - 1 )) ]; then pos=0; fi
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done
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# Remove blank items from array
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for item in "${checked[@]}"; do
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if [[ "$item" != "" ]]; then
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CHECKED_ITEMS+=("$item")
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fi
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done
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clear # clear screen
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tput rmcup # restore screen contents
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tput cnorm # show terminal cursor
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}
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messagebox() {
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# Message box
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#
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# Variables:
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# MSGBOX_TITLE -- title (centered and bold);
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# MSGBOX_WIDTH -- terminal width. Default: 75 cols;
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# MSGBOX_HELP -- help message.
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tput smcup # save screen contents
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tput civis # hide terminal cursor
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clear # clear screen
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local w=""
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[ "$MSGBOX_WIDTH" ] && w="$MSGBOX_WIDTH" || w=75
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if [ "$MSGBOX_TITLE" ]; then
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local hw=$(( ( ( $w - ${#MSGBOX_TITLE} ) - 2 ) / 2 ))
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local chars=0
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local filler=""
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while [ $chars -ne $hw ]; do filler+=" "; let chars++; done
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MSGBOX_TITLE=$(tr '[:lower:]' '[:upper:]' <<< ${MSGBOX_TITLE})
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echo -e "$filler \e[1m$MSGBOX_TITLE\e[0m $filler"
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fi
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echo -e "$@" #| fmt --width="$w" # diplay message
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if [ "$MSGBOX_HELP" ]; then
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echo -e "$MSGBOX_HELP"
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else
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tput cup $(tput lines) 0
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echo -en "\e[7mPress any key to quit\e[27m"
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tput home
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fi
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read -r -s -n 1 inp
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case "$inp" in
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* ) clear -x; tput rmcup; tput cnorm; return 0;;
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esac
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}
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yesno() {
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# Yes/No interactive dialog
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#
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# Variales:
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# ASSUME_YES -- skip dialog, return "Yes";
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# YN_INDENT -- indent;
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# YN_HELP -- help text.
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[ "$ASSUME_YES" ] && return 0
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tput smcup # save screen contents
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tput civis # hide terminal cursor
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local pos=0
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local yn=( Yes No )
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local answer=
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local prompt="$@"
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while [[ ! "$inp" =~ [qQ] ]]; do
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clear
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if [ "$prompt" ]
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then echo -e "$prompt"
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else echo -e "Continue?\n"
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fi
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for i in "${!yn[@]}"; do
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[ "$YN_INDENT" ] && echo -en "$YN_INDENT"
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if [ $i -eq $pos ]
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then echo -en "> \e[7m${yn[${i}]}\e[27m\t"
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else echo -en " ${yn[${i}]}\t"
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fi
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done
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if [ "$YN_HELP" ]; then
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echo -en "$YN_HELP"
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else
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tput cup $(tput lines) 0
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echo -en "\e[7mY - yes, N - no, q to qiut\e[27m"
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tput home
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fi
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# Read input (including arrow keys)
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local inp=
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local escape_char=$(printf "\u1b")
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read -r -s -n 1 inp # get 1 character
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# Read 2 more chars
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if [[ $inp == $escape_char ]]; then read -r -s -n 2 inp; fi
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case "$inp" in
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[[hHjJ]|'[A'|'[D' ) pos=$(( $pos - 1 )) ;; # move up
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[]kKlL]|'[B'|'[C' ) pos=$(( $pos + 1 )) ;; # move down
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[yY] ) answer=Yes; break ;;
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[nN] ) answer=No; break ;;
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'' ) answer="${yn[${pos}]}"; break ;; # enter
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esac
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# Jump to last item if user press "up" when pos=0 and vice versa
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if [ $pos -lt 0 ]; then pos=$(( ${#yn[@]} - 1 )); fi
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if [ $pos -gt $(( ${#yn[@]} - 1 )) ]; then pos=0; fi
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done
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case $answer in
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Yes) answer=0;;
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No) answer=1;;
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esac
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tput rmcup # restore screen
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tput cnorm # show cursor
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return $answer # return exit code
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}
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