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https://github.com/tw93/Mole.git
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Reconstruct clean lib code
This commit is contained in:
Tw93
316
lib/ui/menu_simple.sh
Executable file
316
lib/ui/menu_simple.sh
Executable file
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#!/bin/bash
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# Paginated menu with arrow key navigation
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set -euo pipefail
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# Terminal control functions
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enter_alt_screen() { tput smcup 2> /dev/null || true; }
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leave_alt_screen() { tput rmcup 2> /dev/null || true; }
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# Get terminal height with fallback
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_ms_get_terminal_height() {
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local height=0
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# Try stty size first (most reliable, real-time)
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# Use </dev/tty to ensure we read from terminal even if stdin is redirected
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if [[ -t 0 ]] || [[ -t 2 ]]; then
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height=$(stty size < /dev/tty 2> /dev/null | awk '{print $1}')
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fi
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# Fallback to tput
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if [[ -z "$height" || $height -le 0 ]]; then
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if command -v tput > /dev/null 2>&1; then
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height=$(tput lines 2> /dev/null || echo "24")
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else
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height=24
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fi
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fi
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echo "$height"
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}
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# Calculate dynamic items per page based on terminal height
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_ms_calculate_items_per_page() {
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local term_height=$(_ms_get_terminal_height)
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# Layout: header(1) + spacing(1) + items + spacing(1) + footer(1) + clear(1) = 5 fixed lines
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local reserved=6 # Increased to prevent header from being overwritten
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local available=$((term_height - reserved))
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# Ensure minimum and maximum bounds
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if [[ $available -lt 1 ]]; then
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echo 1
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elif [[ $available -gt 50 ]]; then
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echo 50
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else
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echo "$available"
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fi
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}
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# Main paginated multi-select menu function
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paginated_multi_select() {
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local title="$1"
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shift
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local -a items=("$@")
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local external_alt_screen=false
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if [[ "${MOLE_MANAGED_ALT_SCREEN:-}" == "1" || "${MOLE_MANAGED_ALT_SCREEN:-}" == "true" ]]; then
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external_alt_screen=true
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fi
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# Validation
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if [[ ${#items[@]} -eq 0 ]]; then
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echo "No items provided" >&2
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return 1
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fi
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local total_items=${#items[@]}
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local items_per_page=$(_ms_calculate_items_per_page)
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local cursor_pos=0
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local top_index=0
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local -a selected=()
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# Initialize selection array
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for ((i = 0; i < total_items; i++)); do
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selected[i]=false
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done
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if [[ -n "${MOLE_PRESELECTED_INDICES:-}" ]]; then
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local cleaned_preselect="${MOLE_PRESELECTED_INDICES//[[:space:]]/}"
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local -a initial_indices=()
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IFS=',' read -ra initial_indices <<< "$cleaned_preselect"
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for idx in "${initial_indices[@]}"; do
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if [[ "$idx" =~ ^[0-9]+$ && $idx -ge 0 && $idx -lt $total_items ]]; then
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selected[idx]=true
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fi
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done
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fi
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# Preserve original TTY settings so we can restore them reliably
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local original_stty=""
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if [[ -t 0 ]] && command -v stty > /dev/null 2>&1; then
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original_stty=$(stty -g 2> /dev/null || echo "")
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fi
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restore_terminal() {
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show_cursor
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if [[ -n "${original_stty-}" ]]; then
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stty "${original_stty}" 2> /dev/null || stty sane 2> /dev/null || stty echo icanon 2> /dev/null || true
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else
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stty sane 2> /dev/null || stty echo icanon 2> /dev/null || true
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fi
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if [[ "${external_alt_screen:-false}" == false ]]; then
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leave_alt_screen
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fi
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}
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# Cleanup function
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cleanup() {
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trap - EXIT INT TERM
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restore_terminal
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}
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# Interrupt handler
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handle_interrupt() {
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cleanup
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exit 130 # Standard exit code for Ctrl+C
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}
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trap cleanup EXIT
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trap handle_interrupt INT TERM
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# Setup terminal - preserve interrupt character
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stty -echo -icanon intr ^C 2> /dev/null || true
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if [[ $external_alt_screen == false ]]; then
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enter_alt_screen
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# Clear screen once on entry to alt screen
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printf "\033[2J\033[H" >&2
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else
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printf "\033[H" >&2
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fi
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hide_cursor
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# Helper functions
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print_line() { printf "\r\033[2K%s\n" "$1" >&2; }
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render_item() {
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local idx=$1 is_current=$2
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local checkbox="$ICON_EMPTY"
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[[ ${selected[idx]} == true ]] && checkbox="$ICON_SOLID"
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if [[ $is_current == true ]]; then
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printf "\r\033[2K${BLUE}${ICON_ARROW} %s %s${NC}\n" "$checkbox" "${items[idx]}" >&2
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else
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printf "\r\033[2K %s %s\n" "$checkbox" "${items[idx]}" >&2
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fi
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}
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# Draw the complete menu
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draw_menu() {
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# Recalculate items_per_page dynamically to handle window resize
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items_per_page=$(_ms_calculate_items_per_page)
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# Move to home position without clearing (reduces flicker)
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printf "\033[H" >&2
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# Clear each line as we go instead of clearing entire screen
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local clear_line="\r\033[2K"
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# Count selections for header display
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local selected_count=0
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for ((i = 0; i < total_items; i++)); do
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[[ ${selected[i]} == true ]] && ((selected_count++))
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done
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# Header
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printf "${clear_line}${PURPLE}%s${NC} ${GRAY}%d/%d selected${NC}\n" "${title}" "$selected_count" "$total_items" >&2
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if [[ $total_items -eq 0 ]]; then
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printf "${clear_line}${GRAY}No items available${NC}\n" >&2
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printf "${clear_line}\n" >&2
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printf "${clear_line}${GRAY}Q${NC} Quit\n" >&2
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printf "${clear_line}" >&2
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return
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fi
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if [[ $top_index -gt $((total_items - 1)) ]]; then
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if [[ $total_items -gt $items_per_page ]]; then
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top_index=$((total_items - items_per_page))
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else
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top_index=0
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fi
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fi
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local visible_count=$((total_items - top_index))
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[[ $visible_count -gt $items_per_page ]] && visible_count=$items_per_page
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[[ $visible_count -le 0 ]] && visible_count=1
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if [[ $cursor_pos -ge $visible_count ]]; then
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cursor_pos=$((visible_count - 1))
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[[ $cursor_pos -lt 0 ]] && cursor_pos=0
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fi
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printf "${clear_line}\n" >&2
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# Items for current window
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local start_idx=$top_index
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local end_idx=$((top_index + items_per_page - 1))
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[[ $end_idx -ge $total_items ]] && end_idx=$((total_items - 1))
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for ((i = start_idx; i <= end_idx; i++)); do
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[[ $i -lt 0 ]] && continue
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local is_current=false
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[[ $((i - start_idx)) -eq $cursor_pos ]] && is_current=true
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render_item $i $is_current
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done
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# Fill empty slots to clear previous content
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local items_shown=$((end_idx - start_idx + 1))
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[[ $items_shown -lt 0 ]] && items_shown=0
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for ((i = items_shown; i < items_per_page; i++)); do
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printf "${clear_line}\n" >&2
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done
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# Clear any remaining lines at bottom
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printf "${clear_line}\n" >&2
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printf "${clear_line}${GRAY}${ICON_NAV_UP}${ICON_NAV_DOWN} | Space | Enter | Q Exit${NC}\n" >&2
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# Clear one more line to ensure no artifacts
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printf "${clear_line}" >&2
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}
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# Main interaction loop
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while true; do
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draw_menu
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local key=$(read_key)
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case "$key" in
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"QUIT")
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cleanup
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return 1
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;;
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"UP")
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if [[ $total_items -eq 0 ]]; then
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:
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elif [[ $cursor_pos -gt 0 ]]; then
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((cursor_pos--))
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elif [[ $top_index -gt 0 ]]; then
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((top_index--))
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fi
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;;
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"DOWN")
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if [[ $total_items -eq 0 ]]; then
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:
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else
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local absolute_index=$((top_index + cursor_pos))
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if [[ $absolute_index -lt $((total_items - 1)) ]]; then
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local visible_count=$((total_items - top_index))
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[[ $visible_count -gt $items_per_page ]] && visible_count=$items_per_page
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if [[ $cursor_pos -lt $((visible_count - 1)) ]]; then
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((cursor_pos++))
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elif [[ $((top_index + visible_count)) -lt $total_items ]]; then
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((top_index++))
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visible_count=$((total_items - top_index))
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[[ $visible_count -gt $items_per_page ]] && visible_count=$items_per_page
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if [[ $cursor_pos -ge $visible_count ]]; then
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cursor_pos=$((visible_count - 1))
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fi
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fi
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fi
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fi
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;;
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"SPACE")
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local idx=$((top_index + cursor_pos))
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if [[ $idx -lt $total_items ]]; then
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if [[ ${selected[idx]} == true ]]; then
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selected[idx]=false
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else
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selected[idx]=true
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fi
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fi
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;;
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"ALL")
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for ((i = 0; i < total_items; i++)); do
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selected[i]=true
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done
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;;
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"NONE")
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for ((i = 0; i < total_items; i++)); do
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selected[i]=false
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done
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;;
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"ENTER")
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# Store result in global variable instead of returning via stdout
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local -a selected_indices=()
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for ((i = 0; i < total_items; i++)); do
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if [[ ${selected[i]} == true ]]; then
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selected_indices+=("$i")
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fi
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done
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# Allow empty selection - don't auto-select cursor position
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# This fixes the bug where unselecting all items would still select the last cursor position
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local final_result=""
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if [[ ${#selected_indices[@]} -gt 0 ]]; then
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local IFS=','
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final_result="${selected_indices[*]}"
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fi
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# Remove the trap to avoid cleanup on normal exit
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trap - EXIT INT TERM
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# Store result in global variable
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MOLE_SELECTION_RESULT="$final_result"
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# Manually cleanup terminal before returning
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restore_terminal
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return 0
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;;
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esac
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done
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}
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# Export function for external use
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if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
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echo "This is a library file. Source it from other scripts." >&2
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exit 1
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fi
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