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98 lines
2.3 KiB
98 lines
2.3 KiB
2 years ago
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#!/usr/bin/env sh
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# This script generates a menu from the given list of items. Choosing an item runs the command for that item.
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# Usage: menu "Please choose" "item1 item2 item3" "ls cat command3"
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# Use up/down arrow keys to select a menu item, then press Enter. Or cancel with ESC.
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. colors
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description=$1
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items=($2)
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commands=($3)
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selected=0
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displayed=0
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# Calculate the position of the menu
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menu_x=$((0))
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menu_y=$(fathom-cursor -y)
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# Calculate the number of rows that the menu will occupy
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num_rows=${#items[@]}
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# Calculate the maximum length of the item names
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max_name_length=$(max-length "${items[*]}")
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max_name_length=$((max_name_length))
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# Define the function to display the menu
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display_menu() {
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# Get the dimensions of the terminal window (again each time in case window is resized)
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window_width=$(fathom-terminal -w)
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window_height=$(fathom-terminal -h)
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# Recalculate the position of the menu
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menu_y=$(fathom-cursor -y)
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# Move the cursor to the correct position
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if [ $displayed -eq 0 ]; then
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# Don't move the cursor or clear the screen the first time
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displayed=1
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else
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if [ $((menu_y + num_rows)) -ge $window_height ]; then
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menu_y=$((window_height))
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fi
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move-cursor $menu_x $((menu_y - num_rows))
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fi
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# Print the items and commands
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for i in "${!items[@]}"; do
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if [ $i -eq $selected ]; then
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printf "${CYAN}> %-${max_name_length}s${RESET} ${GREY}%s${RESET}\n" "${items[$i]}" "${commands[$i]}"
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else
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# Print the menu item plus extra spaces to cover up its command, since it's not selected
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printf " %-${max_name_length}s %*s\n" "${items[$i]}" "${#commands[$i]}"
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fi
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done
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}
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# Define the function to handle key presses
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handle_key() {
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key=$(await-keypress)
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case "$key" in
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up)
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selected=$((selected - 1))
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if [ $selected -lt 0 ]; then
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selected=$((num_rows - 1))
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fi
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;;
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down)
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selected=$((selected + 1))
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if [ $selected -ge $num_rows ]; then
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selected=0
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fi
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;;
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enter)
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cursor-blink on
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command="${commands[$selected]}"
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printf "\n"
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eval $command
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exit 0
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;;
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escape)
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cursor-blink on
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echo ESC
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exit
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;;
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esac
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}
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cursor-blink off
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# Display the menu's description
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echo $description
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# Menu loop
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while true; do
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display_menu
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handle_key $key
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done
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