color: colorize based on output labels instead of parsing output By overriding ui.write(), ui.write_err(), ui.popbuffer(), and ui.label(), the color extension can avoid parsing command output and simply colorize output based on labels. As before, the color extension provides a list of default colors for core commands/labels. Other extensions can provide their own defaults by specifying a colortable dict (similar to cmdtable). In this process, --color is promoted to a global option and the deprecated --no-color option is removed.