generate_combinations.sh

#!/bin/bash

# Default values
button_count=8 # Total number of buttons
required_presses=-1 # Required number of buttons pressed (-1 means no requirement)
generate=false # Flag to check if we should generate combinations

# Function to display help
show_help() {
    echo "Usage: $0 [-b BUTTON_COUNT] [-r REQUIRED_PRESSES] [-g]"
    echo "  -b BUTTON_COUNT      Specify the total number of buttons (default is 8)."
    echo "  -r REQUIRED_PRESSES  Specify the exact number of buttons that must be pressed (optional)."
    echo "  -g                   Generate combinations. Without this flag, the script will only show help."
    echo "  -h                   Display this help and exit."
}

# Show help if no arguments are passed
if [ $# -eq 0 ]; then
    show_help
    exit 0
fi

# Read arguments
while getopts "hgb:r:" opt; do
  case $opt in
    h) show_help; exit 0;;
    g) generate=true;;
    b) button_count=$OPTARG;;
    r) required_presses=$OPTARG;;
    \?) show_help; exit 1;;
  esac
done

# Only generate combinations if the -g flag is set
if [ "$generate" = true ]; then
    # Calculate the maximum number of digits (combinations)
    max_digits=$((2**button_count - 1))

    # Loop through all numbers from 0 to the maximum number
    for ((i=0; i<=max_digits; i++)); do
        # Convert number to binary with padding on the left
        binary=$(printf "%0${button_count}d" $(bc <<< "obase=2;$i"))
        
        # Count number of presses (number of 1s in the binary string)
        presses=$(grep -o "1" <<< "$binary" | wc -l)
        
        # Check if the number of presses meets the required number (if specified)
        if [ $required_presses -ne -1 ] && [ $presses -ne $required_presses ]; then
            continue
        fi

        # Prepare the human-readable format
        human_readable=""
        for ((j=0; j<${#binary}; j++)); do
            if [ "${binary:$j:1}" == "1" ]; then
                # Append the button number to the human-readable string
                human_readable="$human_readable $((j+1))"
            fi
        done

        # Print the result
        if [ -z "$human_readable" ]; then
            echo "$i: Don't press any button."
        else
            echo "$i: Press button(s):$human_readable."
        fi
    done
else
    show_help
fi