[REBOL] Useless Needs (was: request-font)
From: rebol-list2::seznam::cz at: 18-Jan-2003 12:21
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!"
]
-------
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] )==
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