[REBOL] Re: Useless Needs (was: request-font)
From: carl:cybercraft at: 20-Jan-2003 8:50
On 19-Jan-03, RebOldes wrote:
> Hello Carl,
> Just one think.... using the Needs in the header is bad idea because
> it's simply stupid! I think that RT are lost in their own product
> version conventions.
> Rebol/Link (IOS version of Rebol which should be better then
> Rebol/View) should be good enough to run your script
> (get-fonts-windows.r) but with the
> Needs: [Rebol/View 1.2.1] is result:
> ** Script Error: This script needs 1.2.1 or better to function
> correctly ** Where: do-boot
> ** Near: do/args dir args return true
>>> system/version
> == 1.0.6.3.1
>>> system/product
> == Link
>>>
> If it would be possible to use: Needs: [REBOL/View 1.2.1 Rebol/Link
> 1.0.6] It would be ok, but it's not possible! So... if you want to
> make sure that the script will be running on some Rebol/Product, you
> should write own testing as for example: -------
> can-run?: does [
> switch/default system/product [
> View [system/version >= 1.2.1]
> Link [system/version >= 1.0.5]
> ][ false ]
> ]
> if not can-run? [
> print "*** You have unsupported Rebol/Product!"
> print "*** The script may not be running properly!"
> ]
> -------
I don't see that as a solution, as I've no way to test it on Link,
since I don't have it. The solution is for RT to get their version
numbering (or Needs' testing) right.
Incidentily, Gregg couldn't upload the scripts to the library when
they just had needs: [View] in the header. Changing it to Needs:
[REBOL/View] did the trick.
> With such a way you may also fix some version dependent changes (for
> example to set/modify some functions to be able run the script under
> that version.
> .....and when I'm talking about the Rebol header and it's Needs
> value... I started to use Require to enter files which the script
> will use (this cannot be added to Needs value, just because the
> Needs testing is strange:)
> Cheers Oldes
> =( Oliva David )=======================( [oliva--david--seznam--cz] )> =( Earth/Europe/Czech_Republic/Brno
)> =( coords: [lat: 49.22 long: 16.67] )=============================
--
Carl Read
