ao-mud/spells/cantrips/fathom-cursor

#!/bin/sh

# 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() {
    x=false
    y=false
    verbose=false
    for arg; do
        case "$arg" in
            --verbose|-v) verbose=true ;;
            -x) x=true ;;
            -y) y=true ;;
        esac
    done

    # Get the position of the cursor
    stty -echo
    printf "\033[6n"
    IFS=';' read -r -d R ROW COL
    stty echo
    position=$(printf "%s;%s" "${ROW#*[}" "${COL%%R*}")

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