red/help

For help with your code, suggestions and ideas, and learning Red.

Gregg Irwin

@greggirwin

We have https://progress.red-lang.org/, to summarize changes, but it's not the same as a changelog, which we hope to do more consistently in the future.

And, again, a huge thanks to @x8x for making that progress page. It's fantastic.

Sunnypt

@Sunnypt

ok, sorry - just wanted to know about new things as they are introduced

Sunnypt

@Sunnypt

i meant new functions, actions etc.

Gregg Irwin

@greggirwin

Yes, that's what a changelog will help with.

Sunnypt

@Sunnypt

thanks - so at the moment new builds appear, but who knows what new features they hold ?

Sunnypt

@Sunnypt

yes , sorry - just keen to know what's new

nedzadarek

@nedzadarek

If I have a block! I can retrieve value by:

integer! -> arr: [11 22 33] arr/1; 11
word! -> arr: [a 1 b 2] arr/b; 2
paren! -> result of the paren! can be: any-word (same as word!), integer (see above), other value (select arr 'a)

Do I miss something?

Gregg Irwin

@greggirwin

@Sunnypt you need to monitor the progress page or commits. We include big notes with big releases and blog announcements, which we hope to do much more frequently. New docs efforts ramping up as well.

@nedzadarek correct. See https://doc.red-lang.org/en/datatypes/path.html for more details. Paren values in paths are currently supported, and can be useful, but that design decision isn't frozen.

dsunanda

@dsunanda

@Sunnypt I have a toy utility that can uncover many of the differences between versions of R2, R3 and Red. Here's an example of what has changed as NATIVEs, ACTIONs and FUNCTIONs between the original 0.6.3 release of Red, and last week click here to download - you'll need to unzip.
But as Gregg says, it is generally better to track progress by what has been reported as an intentional change - rather than just by spotting what is different.

Toomas Vooglaid

@toomasv

@nedzadarek There is one more accessor: set-word!

c: [a: 1 b: 2 (y 5) 6]
y: 'a
c/:y
;== 1
y: quote (y 5)
c/:y   ; But this gets the evaluated result of parens, which is 5, so 5th element
;== (y 5)
c/(y)  ; This selects as `select/only`
;== 6

Consider also this

c: [a: 1 b: 2 (y 5) 6 x 3 x: 4]
y: quote x:
;== x:
c/:y ; Selects first x 
;== 3
c/(y) ; Also selects first x
;== 3
select/same c quote x: ; Only this selects exactly
;== 4
select/same c y
;== 4

Toomas Vooglaid

@toomasv

Er .. get-word! :flushed:

Toomas Vooglaid

@toomasv

Also

c: [a: 1 b: 2 (y 5) 6]
y: quote (quote (y 5))
c/:y
;== 6
c/(quote (y 5))
;== 6
; But
c/(y)
;== none
c/((y 5))
;== (y 5)

Semseddin Moldibi

@endo64

Good explanations @toomasv thanks!

nedzadarek

@nedzadarek

@greggirwin @toomasv thank you.

@toomasv right, I forgot about get words. Also good point about:

y: quote (y 5)
c/:y   ; But this gets the evaluated result of parens, which is 5, so 5th element
;== (y 5)
c/(y)  ; This selects as `select/only`
;== 6

I have not used get words with parens. I thought that everything is passed "as-is" (integer as integer, block as block etc). I mean you set some selector (for example: selector: 42) and you want to select value from collection based on that value not something evaluated or changed (only exception is any-word are treated the same). One reason to use one or another syntax (arr/:a vs arr/(a)).

Toomas Vooglaid

@toomasv

@endo64 @nedzadarek :+1:

Oldes Huhuman

@Oldes

In Rebol2 & Rebol3:

c: [a: 1 b: 2 (y 5) 6]
y: quote (y 5)
c/(y) ;== 6
c/:y  ;== 6

@dockimbel is difference with Red by design?

Gregg Irwin

@greggirwin

@toomasv, great detailed notes. Worth a wiki page, or additions to official docs. Thoughts @gltewalt ?

Alan Macleod

@fergus4

I know network stuff is barely touched but is there a way to get local ip like in rebol : "system/network/host-address"

Boleslav Březovský

@rebolek

@fergus4 that's not possible yet AFAIK, but you use some free service, like

parse read https://ipfacts.info/ [thru "<h2>My IP Address" thru <p> copy ip to space] load ip

Greg T

@gltewalt

@greggirwin I think, start with Wiki Notes until further rumination

How to fold it into official docs calls for some more thinking. A wiki entry will preserve @toomasv content until there is a plan.

Gregg Irwin

@greggirwin

:+1:

nedzadarek

@nedzadarek

In the red/rep there are 30 issues but only 4 adocs. Should I just make an issue, and if we discus pros & cons of this, and we agree on something, I should make an adoc?

Gregg Irwin

@greggirwin

It should be done as a REP %.adoc. The issues were ported out of the main repo, just so they didn't get lost. The REP needs to lay out the enhancement in detail, rather than design-by-chat.

Semseddin Moldibi

@endo64

@rebolek It will not give you the local IP address.
read http://ident.me also gives you the non-local IP.

On windows, this will give the local IPv4 address

call/output "ipconfig" s: make string! 255
to tuple! copy/part pos: find/tail find s "IPv4 Address" ": " find pos "^/"
; == 192.168.0.16

nedzadarek

@nedzadarek

I see.

rebred

@rebred

a CGI script works fine when using red-063 but when I use red-13nov18-7404492a it hangs and doesn't run

Boleslav Březovský

@rebolek

@rebred what CGI script.

rebred

@rebred

#!/Library/WebServer/Documents/red-063
Red[]
print "Content-type: text/html^/"
print now/time

Boleslav Březovský

@rebolek

hm strange. Not sure why this shouldn't work

rebred

@rebred

it hangs for like 40 seconds and then it gives Internal Server Error

rebred

@rebred

also when I try to use RANDOM in the CGI script, it gives me the same result over and over again

Red[]
print "Content-type: text/html^/"
print random 10

Vladimir Vasilyev

@9214

@rebred maybe because you don't seed it with unique value on each run.

rebred

@rebred

thanks! I added random/seed now/time before random and it works!

amreus

@amreus

@rebred try 2 newlines instead of one.

Boleslav Březovský

@rebolek

@amreus that should be fine, one newline is added by print

amreus

@amreus

@rebolek Yep just a thought.

viayuve

@viayuve

how to do one task at a time execution. like resource locking something like that? when one user's task in execution, another user must not be able to execute another task.

viayuve

@viayuve

need small example on call/input "string"

Boleslav Březovský

@rebolek

>> call/input/output "cat" "hello world" s: ""
== 0
>> s
== "hello world"

amreus

@amreus

Referring to this line from @endo64 example: call/output "ipconfig" s: make string! 255 There must be some advantage to allocating the string size over using something simple like: s: copy {}?

Boleslav Březovský

@rebolek

@amreus you reserve space for string, so when you extend the string, Red does not have to allocate another space for it. Or if you need less space than standard allocation.

But copy {} is perfectly fine.

amreus

@amreus

@rebolek So Red needs to allocate the memory either way so might as well make a string the right size from the start. It could avoid allocating twice.

Boleslav Březovský

@rebolek

@amreus if you know the right size (do not want to extend the string later) then yes. copy {} is basically make string! default-size.

If you're interested what default-size is, you need to check Red sources.

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