bash/examples/startup-files/fix-output

# This is an example set of functions to call from PROMPT_COMMAND. If you
# run commands that don't terminate their output with a newline, this can
# detect it and add a newline before printing the readline prompt.

# Readline assumes that it begins with the cursor in column 0 and makes
# redisplay decisions based on that. If it does not start at column 0, for
# example if the previous command does not end with a newline, it will lead
# to display problems when the cursor is not where readline assumes.

_fetch_cursor_position()
{
    local -a pos
    IFS='[;' read -t 0.5 -p $'\e[6n' -d R -a pos -rs || {
        echo "${FUNCNAME}: failed: $? ; ${pos[*]}" >&2
        return 1
    }
    _cursor_row="${pos[1]}"
    _cursor_col="${pos[2]}"
}

_prompt_command()
{
    _fetch_cursor_position && (( $_cursor_col > 1 )) && printf '\n'
}

PROMPT_COMMAND=_prompt_command