add -x flag for hexadecimal output

[shmibs]

prints a hex colour code in the typical #RRGGBB form

does not change default behaviour (running without flags returns in integer form), so existing usage should not break

[djpohly]

Thanks for the pull request!

Is there an advantage to doing it in the stint code rather than, say:

stint | xargs -n3 printf '#%02x%02x%02x\n'

The reason I chose decimal output was to make that easy to do. :)

[shmibs]

i guess only that it seems a common use-case, and not everyone knows how or thinks to do things like that, judging by a quick search and this thread

[shmibs]

...and, as xoris has since been removed from the AUR and grabc (like you'd mentioned in that thread) doesn't actually work consistently, using stint is the easy option that's left to people

[vaygr]

I'd second that.