>>>>> On Mon, 11 Dec 2023, Eli Schwartz wrote:

>> +	local color=yes
>> +	[[ ${NO_COLOR} ]] && color=no

> [[ -v NO_COLOR ]]

No, this would give the wrong result if NO_COLOR is set to an empty
value. [[ ${NO_COLOR} ]] or [[ -n ${NO_COLOR} ]] is the correct test:

   "Command-line software which adds ANSI color to its output by default
   should check for a NO_COLOR environment variable that, when present
   and not an empty string (regardless of its value), prevents the
   addition of ANSI color." -- https://no-color.org/