World: r3wp

If I only was a bit sure that there would be enoough compatibility 
between R2 and R3, I probably would begin to learn rebol and write 
programs I need without Russian living this part for a future, when 
R3 would be released. But who can point me how much of compatibility 
would it be and in which places of rebol? Maybe syntax would change 
so much that one would have to rewrite scripts from the beginning? 
Who knows..

Henrik, can you tell me where is it possible to find that Linux port? 
I'd like to test it with all it's flaws but as I said I couldn't 
find anything from alpha for Linux at all

syntax won't change much. it's the underlying conventions, dlalects 
and UI that will change, so if you learn R2, it will be easy to move 
to R3.

Alexandr, the port was internal. Not released.

Thanks for the tip, probably I really would  begin with that without 
unicode in hope I would add this possibility later!

Ah, internal...I see.

As for now I have to write my very simple program in gtkdialog and 
I must say it doesn't inspire me at all after reading and trying 
many rebol scripts and wondering how simple can simple things be 
:-)

very understandable. :-)

<If I only was a bit sure that there would be enoough compatibility 
between R2 and R3...>

They will be highly compatible, but with enough changes to break 
many scripts. As far as I know there is no definitive list of confirmed 
incompatibilities on the R3 wiki. A quick scan of the R3 blog offers 
some clues:
http://www.rebol.net/cgi-bin/r3blog.r?index=0

Does anybody have any experience with Lucene full text search library?

Its written in java... one of my friends who mostly uses python says 
its exellent and very fast.

Is there anything like that in rebol besides simple rebol functions 
like find, select ?

You could take a look at Sunanda's skimp - http://www.rebol.org/documentation.r?script=skimp.r

I think Maarten looked at Lucene. He can confirm when he checks in 
here. He's done some other indexing R&D as well, so will have good 
input.

Not sure it is the right group.

Could someone please remind me how to use read/custom to read and 
post cookies ?

Is there a way to scan a document from Rebol script, and to use it 
in program as file or image ?
To start scaning using available Twain or Wia drivers?
Or external exe or dll ?

Yes

see the scanning routines I wrote on rebol.org

Graham is being too modest to provide an exact link :-)
http://www.rebol.org/view-script.r?script=eztwain.r

too lazy is the reality

Graham, Does that only work woth the commercial version of EZTwain? 
Or does Classic work too?

no idea ... that was in 2006!

I think NickA has also posted some scanning stuff on the mailing 
list, or on his website.

Thanks

Thanks.... I'm also lazy to search rebol.org.... its easyer to ask 
here :)

My code was to capture from video source, but may provide some useful 
clues:   http://www.rebol.org/view-script.r?script=web-cam.rThe 
same script with constants most clearly defined, is here:  http://guitarz.org/files/capture.r

I wondered this for long time, and never found it... does rebol have 
a native equivalent of HL functions like map, reduce, filter ?

HL ?

higher level ... ok sorry Higher Order Functions

functions that take functions as parameters, map, reduce, filter 
are basic functions for functional programming

I know I can write them on my own but because rebol is more of a 
functional language with all kinds of power features I am not sure 
if something like this isn't already in

huuu... don't see you point, as far i know, they are easy to simulate 
with some rebol instructions.

with which language are you comparing ?

no specific language I will write map in rebol and show you , it 
should be a simple function

but what is your reference ? map can have many implementations depending 
the language...

*many specifications

REBOL doesn't include the standard higher-order functions, though 
they can be written in REBOL. Since there is no way to practically 
specify literal function values that work properly, the standard 
in REBOL is to use blocks for control function parameters rather 
than functions. Even though we are making the series mezzanines more 
friendly to function values, even in R3 the standard HOFs are being 
translated to REBOL style before inclusion.

hmm...

So R3 has a MAP, but it takes a word and a block of code as parameters 
instead of a function.

And REDUCE means something different.

aha thanks , yes rebol's  reduce has a different meaning I know

if you are using blocks which seems fine as it's even shorter and 
more agile (and similar to quotations in factor), but how do blocks 
define which parameter is which , in case of map it must take 1 parameter 
in case of reduce 2 ?

I am not too deeply familiar of what blocks are, I suppose these 
are [ block of code ] that you can then "do"

The blocks take no parameters - the calling functions take additional 
parameters of the argument word(s).

uh, I don't understand what is what.. I will rather wait and see 
how it's done in R3 :)

So R3's MAP takes 3 parameters:
- The data

- The word or block of words that will serve as "parameters" for 
the block.
- The block of code.

>> help map
USAGE:
        MAP 'word data body

DESCRIPTION:

        Evaluates a block for each value(s) in a series and returns them 
        as a block.
        MAP is a native value.

ARGUMENTS:

        word -- Word or block of words to set each time (local) (word! block!)
        data -- The series to traverse (block!)
        body -- Block to evaluate each time (block!)

>> map x [1 2 3] [x * x]
== [1 4 9]

aha, I get it , that is nice

>> map [x y] [1 2 3 4 5 6] [x * y]
== [2 12 30]

cool

We will see what other HOFs we will add to R3, in REBOL style. FOLD 
looks promising :)

great, well map and fold are the most used ones by far