ao-mud/spells/cantrips/fathom-cursor

#!/usr/bin/env bash

# This spell reveals the x and y coordinates of the cursor in the terminal window.

# Define the function to calculate the position of the cursor
fathom_cursor() {
    local position
    local x=false
    local y=false
    local verbose=false
    while getopts 'vxy' flag; do
        case "${flag}" in
            --verbose|v) verbose=true ;;
            x) x=true ;;
            y) y=true ;;
        esac
    done

    # Get the position of the cursor
    position=$(IFS=';' read -sdR -p $'\E[6n' ROW COL; printf "%s;%s" "${ROW#*[}" "$COL")

    if [ $x = true ] && [ $y = true ]; then
        if [ $verbose = true ]; then
        	printf "X: %s\n" "${position##*;}"
         	printf "Y: %s\n" "${position%%;*}"
        else
        	printf "%s\n" "${position##*;}"
         	printf "%s\n" "${position%%;*}"
        fi
    else
        if [ $x = true ]; then
            if [ $verbose = true ]; then
                printf "X: "
            fi
            printf "%s\n" "${position##*;}"
        elif [ $y = true ]; then
            if [ $verbose = true ]; then
                printf "Y: "
            fi
            printf "%s\n" "${position%%;*}"
        else
            if [ $verbose = true ]; then
                printf "Position: "
            fi
            printf "%s\n" "$position"
        fi
    fi
}

test_fathom_cursor() {
    assert_equal "$(./fathom-cursor -x)" "$(./fathom-cursor -y)" "fathom_cursor -x and -y outputs differ"
    assert_equal "$(./fathom-cursor -x -v)" "X: $(./fathom-cursor -x)" "fathom_cursor -x and -x -v outputs differ"
    assert_equal "$(./fathom-cursor -y -v)" "Y: $(./fathom-cursor -y)" "fathom_cursor -y and -y -v outputs differ"
    assert_equal "$(./fathom-cursor -x -y -v)" "X: $(./fathom-cursor -x)\nY: $(./fathom-cursor -y)" "fathom_cursor -x -y and -x -y -v outputs differ"
    assert_equal "$(./fathom-cursor -v -x -y)" "Position: $(./fathom-cursor -x -y)" "fathom_cursor -v -x -y and -x -y outputs differ"
    assert_equal "$(./fathom-cursor -v)" "$(./fathom-cursor -x -y -v)" "fathom_cursor -v and -x -y -v outputs differ"
    assert_equal "$(./fathom-cursor)" "$(./fathom-cursor -x -y)" "fathom_cursor and -x -y outputs differ"
}

fathom_cursor "$@"