»ö« Welcome to Perl 6! | perl6.org/ | evalbot usage: 'p6: say 3;' or rakudo:, or /msg camelia p6: ... | irclog: irc.perl6.org or colabti.org/irclogger/irclogger_logs/perl6 | UTF-8 is our friend!
Set by moritz on 22 December 2015.
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japhb .ask masak What's up with the IR clog spelunking? Is there a project afoot? 00:47
yoleaux japhb: I'll pass your message to masak.
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japhb .tell lizmat We once had OpenGL, because back when Parrot was the only backend, I wrote those bindings. Sadly it's been a while since I've messed around with those; maybe after I finish github.com/japhb/Terminal-Print/bl.../rpg-ui.p6 ... which, uh, may be a while. 00:50
yoleaux japhb: I'll pass your message to lizmat.
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Shin_ Hi all... 01:00
m: my @a = <a a b c>; my @b = (20,1,5,4); say sort({$^a cmp $^b}, @a); say sort({$^b cmp $^a}, @b);
camelia rakudo-moar 839e52: OUTPUT«(a a b c)␤(20 5 4 1)␤»
Shin_ so, is there a perl6 way to code a sorting for both columns at the same time,thag could take advantage of auto threading? 01:01
Like an Sql saying 'order by @a asc, @b desc' 01:03
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grondilu .values given sort *.key, (@a >>[=>]<< @b); 01:05
Shin_ Wow, that looks cryptic :) 01:08
And for 3 or more columns, what strategy is suggested. I just want to tale davantage of perl6 lazyness and autothreading if possible. 01:09
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grondilu your sort can not do parallelism by definition, so the only parallelism is in computing the sorting criteria. So you may just create a data structure with all sorting criteria in it, and to do so you can use parallelism. 01:13
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grondilu something like race @a.map( { $_ => [&criterium1($_), &criterium2($_)] } ); 01:15
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Hotkeys m: say (1..3 Z 1..3), (3..1 Z 1..3) 01:28
camelia rakudo-moar 839e52: OUTPUT«((1 1) (2 2) (3 3))()␤»
Hotkeys What's going on here ^
Why does an ascending range work fine with zip
But a descending range doesn't
Juerd m: say 3..1
camelia rakudo-moar 839e52: OUTPUT«3..1␤»
Juerd Heh.
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Hotkeys m: list 3..1 01:29
camelia ( no output )
Hotkeys m: say list 3..1
camelia rakudo-moar 839e52: OUTPUT«()␤»
Hotkeys So are descending ranges not a thing
Juerd Descending ranges don't really exist.
Hotkeys Whoops
Juerd You can use a generated list: 3 ... 1
Hotkeys Right
Thanks 01:31
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Shin_ Thanks grondilu 01:40
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MasterDuke is there a way for a grammar to get/know where in the overall thing it's parsing it is, i.e., the line number of the file? 01:47
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gfldex MasterDuke: you have to count line numbers by hand 01:48
MasterDuke ugh. not sure how i would do that in a grammar? 01:49
gfldex MasterDuke: i got some code for that somewhere, will take a minute or two
MasterDuke sure, np 01:50
gfldex MasterDuke: gist.github.com/gfldex/fcd52d39ae9...52d13717c0 01:51
make sure to count the line before doing any matching
MasterDuke cool, thanks 01:52
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R_I_D question: how am i supposed to be productive in another language now that i know about perl6? 02:04
timotimo we are very sorry 02:05
you can use Inline::Python and Inline::Perl5 (and Inline::Perl6) to share code between languages
so you can keep a few things in perl6
R_I_D Inline Python? youre kidding 02:06
thats awesome
timotimo it's a thing :) 02:07
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seatek i have gone from a day-long, seething loathing of grammars into excited happiness in a matter of 5 minutes. 02:11
i was thinking, what wholly inadequate documentation there is on them... if i ever figure it out, i'll write up some better. but now i realize how hard that would be. seems like it's one of those things that just has to "click" eventually. 02:14
now to start creating chaos with actions 02:15
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SmokeMachine____ Is there a way to get the $=pod from another code? 03:03
AlexDaniel seatek: I've always thought that docs.perl6.org/language/grammars is quite decent 03:20
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seatek AlexDaniel: it is if you already know about them. It jumps straight into Protoregexes without even talking about what Grammars even are, except to say they're a "data structure" made by grouping regexes 03:22
AlexDaniel seatek: haha 03:23
seatek yeah ;) 03:24
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seatek i'm still not clear in actions why the heck and when you'd use "make" even. 03:28
and i've read just about everything there is 03:29
AlexDaniel it's if you want to build AST 03:30
seatek i know it's supposed to create an "AST", but trying to find what that is I have no idea
yes, exactly what the docs said
AlexDaniel okay, well. Once you parsed something, you have a parse tree, right?
seatek sure -- that's all very new to me though 03:31
AlexDaniel now, if the data you are parsing is complex enough, it means that your grammar is probably a bit complex too.
seatek you have component parts stored in methods
AlexDaniel so chances are you'll get a lot of crap in your parse tree
seatek it looks like make is used on things that need to map array and such 03:32
AlexDaniel (to the point that it is not very convenient to work with it)
seatek yeah
AlexDaniel so you build an AST! Which does not contain as much information about the original text and how exactly it was parsed 03:33
seatek ah ok... strips it down a bit
AlexDaniel yea, and you can do some extra stuff there too, depending on your needs 03:34
seatek so basically with actions, you're taking the return value that comes out of TOP, yes? 03:35
AlexDaniel well, it will call a corresponding method for every rule/token/regex it matches, not just TOP. But the value you get from $match.made is from TOP, yes 03:37
seatek right :)
that took FOREVER to figure out.
i could just be dull :) 03:38
AlexDaniel no, it is indeed not that obvious 03:39
seatek i'm basically looking at grammars as a means to create data structures i can have predictable and consistent things to work with
AlexDaniel but if you try to write some basic parser you'll probably figure it all out
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AlexDaniel … or maybe some basic programming language, not just parser… 03:39
seatek yeah that's what i've been doing -- a basic REST construct as my plaything
with "made"... do you need to call that on things you've have "make"'d? i haven't really dug into those guys much yet 03:41
if make is just stripping things down, i don't see why you would 03:42
yet so many of the examples use it without saying why
you look up make -- and it says Sets the AST to $ast, and returns it. 03:43
ah! i understand! ;)
and made.... Returns the payload that was set with method make. 03:44
oh silly me ;)
and an ast is An AST or Abstract Syntax Tree is a partially processed representation of a program. 03:45
why would i want my action to become a partially processed representation of a program? I mean, I can imagine... but how do I work with that? 03:47
i'm not complaining -- i'm just sharing my journey... ;) 03:48
AlexDaniel m: grammar Foo { rule TOP { <int> ‘+’ <int> }; token int { \d+ } }; class Addition { has $.a; has $.b }; class BarAct { method TOP($/) { make Addition.new(a => $<int>[0].made, b => $<int>[1].made) }; method int($/) { make +~$/ } }; my $match = Foo.parse(‘42 + 60’, actions => BarAct.new); say $match; say $match.made
camelia rakudo-moar 839e52: OUTPUT«｢42 + 60｣␤ int => ｢42｣␤ int => ｢60｣␤Addition.new(a => 42, b => 60)␤»
AlexDaniel seatek: you might want to split that into a few lines :) 03:49
seatek AlexDaniel: exactly what I started doing :)
AlexDaniel I'm not sure if it explains anything, but that's the idea 03:51
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seatek i'm still trying to format it to read. emacs can't even help! :) 03:53
no, that's no help at all 03:56
:)
thanks though
:)
i need to be let by the hand with a lollipop and all i get is punk rock ;) 03:57
when this will be a help, i'll have come to understand what i need to ;)
oh wait 03:59
AlexDaniel seatek: well, you can always work with your parse tree if you want to
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seatek maybe if i stare at it for a while 03:59
AlexDaniel m: gist.github.com/AlexDaniel/15ac3d5...ffa3272cef 04:00
camelia rakudo-moar 839e52: OUTPUT«｢42 + 60｣␤ int => ｢42｣␤ int => ｢60｣␤Addition.new(a => SuperInteger.new(value => 42), b => SuperInteger.new(value => 60))␤»
seatek why are the 2 $<int>[*] things getting .made called on them at that point ... they were never 'make'ed
AlexDaniel seatek: they were
seatek they get maked if they come from the grammar automatically? 04:01
AlexDaniel no, there's a method BarAct.int
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seatek it knows to call that method? 04:03
AlexDaniel yes, by its name 04:04
seatek oh i see, because int gets pulled in from the grammar, then it's already been changed for the TOP method
so duplicate token names get put into an array automatically too eh? had no idea about that one. 04:10
AlexDaniel yes 04:11
seatek i don't understand how 'value' could come out 04:12
i mean, how it's added, yes... but how it's outputted i can't see that
AlexDaniel seatek: that's .gist of our object that we created 04:13
seatek just as an element of the data structure i suppose.
and then we just pick out the juicy bits we want 04:14
AlexDaniel committable6: gist.githubusercontent.com/AlexDan...c4/file.p6 04:15
committable6: help
committable6 AlexDaniel, Like this: committable6: f583f22,HEAD say ‘hello’; say ‘world’
AlexDaniel committable6: HEAD gist.githubusercontent.com/AlexDan...c4/file.p6
committable6 AlexDaniel, Successfully fetched the code from the provided URL.
AlexDaniel, gist.github.com/8bf643f794c8f3d1b0...bc0eb131dc
AlexDaniel I should have started doing it in reverse polish notation… :) 04:16
seatek no! :) 04:17
AlexDaniel yes, because to make it work properly with infix notation you'd have to basically build your predence table… :)
which is doable, but uhh! 04:18
seatek yes i've noticed how some simple things are complicated an some complicated get simple
AlexDaniel seatek: anyway, what I wanted to show here is that there is no “operation” in our AST
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seatek so really, it's a bit of a discovery to find out what you've created in your AST then 04:19
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AlexDaniel not sure what you mean by that :) 04:19
seatek i think i'll have to ;) to that 04:20
AlexDaniel seatek: but anyway, if you don't feel any need in AST then perhaps you don't need one in this particular task 04:21
seatek AlexDaniel++ this has been so incredibly helpful.. thank you so much
AlexDaniel just go over your parse tree and get what you need, that works too
seatek i think i probably don't at this point... but i'm going to anyway. i want to get this all feeling second nature
i can see how useful this could be in lots of stuff. i could have been done a couple days ago with this last task but keeping to regexes... but when i see a rabbit hole... ;) 04:23
and this seems so core to everythign in the language, so it seems worth the effort 04:24
AlexDaniel well, it is core, it parses the whole damn thing :) 04:25
seatek i would throw myself into the creek first, than trying to write that. 04:26
can't even imagine at this point 04:27
though i have briefly peeked ;)
AlexDaniel interestingly, one of the example in our docs abuses the whole AST to pass calculated values around… not sure if that's a great example 04:28
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AlexDaniel ast thing* 04:28
seatek there is all manner of voodoo going on in those docs related to grammars 04:29
i did at first imagine using grammars to do class factories directly in the actions, but have since second-thought that 04:30
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AlexDaniel anyway, I have to sleep :) 04:32
see you 🙋
seatek: and feel free to open a couple of tickets in doc repo
seatek: your complaints are correct 04:33
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AlexDaniel it should not jump straight into protos, that's true 04:33
and yes, it should have a bit more text explaining why somebody would need an AST
seatek i'll help write some up gladly. least i can do for your kind help AlexDaniel. thank you again 04:39
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samcv what do you guys use for terminal emulators on linux? i sorta use st and konsole, but st is way too minimal and konsole has problems displaying unicode text properly (cuts characters off and makes the line placement off sometimes for a larger character) 07:16
curious what you guys use
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moritz I use xfce4-terminal, mostly because it's the default on xubuntu 07:22
so far I didn't have any Unicode trouble with it 07:23
samcv hmm
i will try that then
hmm tried it and at least it doesn't glitch the spacing of the lines for tall characters like ｢this｣ but they still get cut off vertically 07:26
but i use a really tiny font
arnsholt I've mostly used gnome-terminal
But not with a tiny font 07:27
samcv a.uguu.se/fNSHlsqDwQHv_Screenshot_...202455.png
arnsholt Modern screens are big, so I can afford the luxury of a big font too =)
samcv hah
i only have 1366 x 768 on my laptop and it's what i use 95% of the time
arnsholt Hah! Apparently the corporate firewall doesn't like your site 07:28
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samcv heh 07:28
arnsholt, try this i.imgur.com/Tx2CaUq.png
it's a bitmap font so only one size. but i love it so much. can fit tons on my screen and it's pretty readable 07:29
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samcv i find it annoying as hell that st, which is only has 10k lines of code is the only one that actually renders text right :( 07:40
idk why it's so hard to resize too big characters to fit inside the box given that terminals are supposed to do monospaced fonts
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samcv tried terminator, termite, konsole, xfce4-terminal, yakuake, terminology, xterm, urxvt-unicode, roxterm. ugh 08:06
bonsaikitten mrxvt seems pretty ok 08:07
tabbed rxvt, mostly sane
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samcv well i've gotten urxvt working except only basically specifying the fallback fonts be like 1/2 the size they should be 08:10
if they're too big urxvt will just not show them at all :\ 08:11
other ones either cut them off or they go into the other lines
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samcv st is the only one that actually shows properly, and it even works for full width symbols too, but always makes sure the height fits. but fullwidth ones show wider than normal ones. i wish i could use the normal clipboard to paste into it though, and not do middle click 08:14
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bonsaikitten haven't seen that issue yet 08:15
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samcv bonsaikitten, maybe your font isn't small enough ;) 08:27
nine samcv: what version of konsole have you tried? 08:31
samcv hmm even with a bigger font xfce terminal will glitch if i type 🐧 as the first thing, and pad it with like 3 spaces of width and then backspacing over it won't remove the last thing..
i'm running the latest
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samcv i have konsole 16.08.2 running KDE 5.8 08:32
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samcv gonna try something brb 08:34
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samcv not sure why this isn't working, but konsole isn't doing my custom compose things in ~/.XCompose 08:38
QT_IM_MODULE is set to xim too other programs work, though in kate things like emojis insert but shows a ? box. but works in non qt programs. 08:42
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lizmat clickbaits p6weekly.wordpress.com/2016/10/31/...-в-perl-6/ 08:50
yoleaux 00:50Z <japhb> lizmat: We once had OpenGL, because back when Parrot was the only backend, I wrote those bindings. Sadly it's been a while since I've messed around with those; maybe after I finish github.com/japhb/Terminal-Print/bl.../rpg-ui.p6 ... which, uh, may be a while.
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[ptc] lizmat++ 09:04
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masak m: sub is-odd($n) { $n % 2 }; .say if 5 ff is-odd($_) for 1..10 09:25
camelia rakudo-moar 839e52: OUTPUT«5␤6␤7␤8␤9␤10␤»
yoleaux 00:47Z <japhb> masak: What's up with the IR clog spelunking? Is there a project afoot?
masak japhb: no, just ended up searching for stuff :)
er, I mean "officially, there's no project afoot" :P
what'm I doing wrong with the `is-odd` thing above?
I'm trying to highlight the difference between ff and fff
masak checks the test suite 09:38
m: say join "", (/B/ ff /B/ ?? $_ !! "x" for <A B A B A>) 09:40
camelia rakudo-moar 839e52: OUTPUT«Use of uninitialized value <element> of type Any in string context.␤Methods .^name, .perl, .gist, or .say can be used to stringify it to something meaningful.␤ in block <unit> at <tmp> line 1␤Use of uninitialized value <element> of type Any in strin…»
masak oh. precedence. 09:42
m: say join "", ((/B/ ff /B/) ?? $_ !! "x" for <A B A B A>)
camelia rakudo-moar 839e52: OUTPUT«xBxBx␤»
masak for some reason I expected infix:<ff> to be tighter than infix:<?? !!>
but they're on the same prec level -- hm 09:43
and right-associative
so... I don't understand why the parens make a difference there...
m: say join "", ((/B/ fff /B/) ?? $_ !! "x" for <A B A B A>)
camelia rakudo-moar 839e52: OUTPUT«xBABx␤»
masak anyway, the spectests deliver. the above is a difference between ff and fff 09:44
dalek c: acd772d | gfldex++ | doc/Type/Regex.pod6:
show how to declare named Regex
 09:50
c: 9246bf3 | gfldex++ | doc/Language/functions.pod6:
index prefix &
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dalek c: b1e96ff | gfldex++ | doc/ (2 files):
name a sigil a sigil
 09:56
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masak m: class A::B {}; class C { has A::B $.ab .= new } # RT #126975 10:08
camelia rakudo-moar 839e52: OUTPUT«===SORRY!===␤Could not locate compile-time value for symbol A::B␤»
masak one of these days curiosity is going to get the better of me, and I will have to check why that one doesn't find the "compile-time value for symbol A::B" :) 10:09
this works:
m: class A::B {}; class C { has A::B $.ab = A::B.new }; say "alive"
camelia rakudo-moar 839e52: OUTPUT«alive␤»
masak so it's gotta have something to do with the `.=` somehow
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jferrero m: say 4 == (1E12.log10 / 3).Round 10:31
camelia rakudo-moar 839e52: OUTPUT«No such method 'Round' for invocant of type 'Num'␤ in block <unit> at <tmp> line 1␤␤»
jferrero m: say 4 == (1E12.log10 / 3).round 10:32
camelia rakudo-moar 839e52: OUTPUT«True␤»
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masak m: say 1E12.log10 / 3 11:03
camelia rakudo-moar b5780f: OUTPUT«4␤»
masak m: say 4 == 1E12.log10 / 3
camelia rakudo-moar b5780f: OUTPUT«False␤»
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masak m: say 4 ≅ 1E12.log10 / 3 11:03
camelia rakudo-moar b5780f: OUTPUT«True␤»
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nicq20 Hello o/ 12:28
masak m: say "ohayo nicq20!" 12:29
camelia rakudo-moar b62321: OUTPUT«ohayo nicq20!␤»
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dalek c: 0acb8ea | coke++ | doc/Type/Regex.pod6:
use our standard phrasing here
 12:44
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ab6tract long ago i started working on making (^) work with bags 13:34
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ab6tract anyone feel strongly about it? 13:36
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LeCamarade Hello, Perl 6; I have Raspbian on a Pi. The Rakudo is from 2014. Will I succeed in compiling one there, or is there a .deb somewhere? 13:39
The Rakudo from the repositories is pre-Christmas. I had trouble compiling before on thin machines like this one. Need I bother? Anybody done done it before? 13:40
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timotimo compiling on a raspberry pi will definitely require a bunch of swap space 13:41
and multiple days of waiting :)
debian's got debs for multiple architectures of moarvm as least, i think?
LeCamarade Right. So I will settle for a pre-compiled ... if I should be able to locate one. 13:42
lizmat github.com/nxadm/rakudo-pkg/releases
El_Che++
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ponzii Is there a more efficient way to do this: for 'logs.txt'.IO.lines -> $_ { .say if $_ ~~ /<<\w ** 15>>/; } 13:48
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masak mebbe: for 'logs.txt'.IO.lines { .say if any(.words>>.chars) == 15 } 13:49
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masak or .say if .words.first(*.chars == 15) 13:50
timotimo really depends on what you need the << and >> for
masak 's mental colomon wakes up and tells masak to use .grep there, not .first 13:51
ponzii That's a regex not a char count
timotimo because words splits on space, doesn't it?
masak oh, right
yes, those are not identical
more similar would be to do .comb(/\w+/), not .words
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ponzii The Python3 and Ruby 2.4 equivalents are still 5 times faster. That's with October Rakudo. 13:53
timotimo yeah, our regexes aren't really very fast
masak I'm happily surprised to hear the others are only 5 times as fast ;)
ponzii timotimo: That's weird as in a lot of math examples Perl6 can be 25 time faster than Python. 13:54
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timotimo of course 13:54
except if you compare perl6 vs pypy. then it's pretty much impossible to beat python :)
ponzii timotimo: ... and strings/regex has traditionally been Perl's forte
arnsholt It's pretty easily explained 13:55
Perl 5 regexes are souped-up automata
Perl 6 regexes are top-down parsers
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timotimo still, a whole bunch of perl6 regexes can become completely automata-based 13:55
... in theory 13:56
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ponzii arnsholt: Does that mean they'll never be as efficient as Perl5 then? 13:56
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arnsholt Not necessarily 13:56
Lots of it can be optimized to a more efficient form
masak they could probably be a bunch faster still
arnsholt Yeah, definitely
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masak we're just pressed for time doing all the obvious optimizations ;) 13:56
arnsholt Yeah, lots of things to do, not so many people to do it 13:57
timotimo i'm pretty sure there hasn't been a bit of work done on the regex optimizer in the last year
ponzii masak: On my machine that log file parse took Perl6 11.03 secs while PHP71 took 0.43 secs. 13:58
masak: Still perplexed how PHP7 is significantly faster than Node and Perl5
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pmurias ponzii: significantly faster in general or on one particular benchmark? 14:00
ponzii pmurias: Well, file i/o + parsing but yes, Perl6 math is pretty impressive 14:01
timotimo if you think perl6 math is impressive, wait until we're able to remove all those NativeRef allocations ... 14:02
and the boxing/unboxing
and jit small-bigint-math
for math stuff, there's definitely room for improvement still 14:04
ponzii timotimo: Well, that's certainly great but maybe Perl6 adoption is going to be affected more by how well it does what Perl5 did well, ie. strings/regex?
timotimo: Perception counts for adoption.
timotimo you're certainly free to invest time in that
did you see the recent commits, btw? 14:05
lizmat made almost everything related to invoking regexes a whole bunch faster
you were saying you're using an "october rakudo"?
i think the majority of these improvement commits have been made after that release, but i could be mistaken
ponzii timotimo: Yes, just tested the latest version.
timotimo: Sorry, latest public .dmg, not recent commits. 14:06
pmurias ponzii: speed is the biggest thing holding Perl 6 back 14:10
LeCamarade And that is just a matter of time. Goodness is the main thing holding every other alternative back. And that cannot be fixed for them. 14:11
Sorry, fundamentalist Perlist here. Tried to resist. Couldn't. 14:12
viki Yes, the .match improvements were after the 2016.10 release.
timotimo i bet we can make a scan for a << much faster 14:13
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timotimo currently it'll be trying to match a LWB every character by looking one back and one in front 14:13
we should be able to jump 2 chars each time instead of just 1
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viki ponzii: to me, it feels strange to measure up Perl 6 to Perl 5. It's a very different language. I'd expect people to use Perl 6 more for large OO projects, due to its rich and expressive object model. The "string and regex" sounds more like the perl -pi -e '' one liner you run at your command line. 14:15
ponzii: a crude comparison of equivalent Perl 6 and Rust code, for my point: twitter.com/zoffix/status/792398913521192960 14:16
I don't even notice Perl 6's performance issues that much any more. I think comparing to language XYZ is a bit meaingless. Real world code is what matters. 14:17
buggable: eco
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buggable viki, Out of 739 Ecosystem dists, 165 have warnings and 0 have errors. See modules.perl6.org/update.log for details 14:17
ponzii viki: I think from an insider's viewpoint you're probably right but I suspect that in the job market Perl6 will be judged according to how well it does what Perl5 does well. Unfortunate but probably the case. 14:18
viki ^ if Perl 5 code does that .3s faster, I couldn't care less.
ponzii: how did you arrive to that conclusion? My impression is "the job market" doesn't want much to do with Perl 5. Why would they be comparing other langs to it?
ponzii viki: Because it's still called Perl :( 14:20
viki :)
Fair enough.
AlexDaniel heh
ponzii viki: Perl5, Perl6 invites the comparison in publications such as InformIT etc. Yes, I know they're crap but they still have influence with CTOs. 14:21
viki Well, I think our optimizations are progressing nicely. I'm putting my chips behind TimToady's remarks that we want nice organic growth; not too slow, not to fast and so far it's working.
ponzii viki: Sure, I get that. 14:22
timotimo anybody up for trying an experiment with the left-word-boundary regex thing? 14:23
i'm willing to give someone step-by-step help 14:24
viki is burnt out and is taking a ~2-3 week break.
timotimo that's fine :)
AlexDaniel I'm not quite sure why people care about optimizations so much… Like you know, we have some really basic stuff not working properly… 14:25
timotimo AlexDaniel, performance is holding me back from doing stuff i consider fun. that's why i'm interested in things getting faster 14:26
AlexDaniel timotimo: well, if you actually start doing that stuff (ignoring performance problems), you'll probably stumble upon a couple of nasty random segfaults… 14:27
so what's more important…
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timotimo it's not like an optimization is as hard as fixing a nasty segfault 14:28
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jnthn AlexDaniel: As I've noted before, the things that people most want optimized are generally not the same set of things that have reliability issues. 14:29
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AlexDaniel which is weird, because once you stumble upon performance issues you very often start to parallelize things 14:30
jnthn: by the way, any news on #129781 ? 14:31
timotimo when i last had a performance issue and wanted to parallelize it got many times slower :)
ab6tract lizmat: i think it would be much nicer for (^) to return a bag 14:32
if any of the args were bags
lizmat well volunteered :-) 14:33
timotimo i seem to recall a big patch series to fix all manner of bag-related things
that was probably yours?
ab6tract i have a feeling i had already patched it and it got optimized away :)
timotimo: indeed :)
lizmat ab6tract: I generally don't optimize away functionality 14:34
ab6tract then i never implemented it properly :D
timotimo must have missed spec tests :<
ab6tract right now the implementation is quite nice because it gets to be an only
whereas i (think i) would need to create different candidates
jnthn AlexDaniel: github.com/perl6/nqp/commit/522487...f3efff9e89 and github.com/perl6/nqp/commit/c0e80f...53eae12a2f may well have helped with the original problem 14:35
AlexDaniel: But the ticket got mis-golfed
AlexDaniel: Valgrind uses --full-cleanup, and all the issues in the further golfed versions are nothing to do with the bug that was initially considered. 14:36
But rather, a --full-cleanup issue
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ab6tract i don't suppose we use subsets/where clauses in CORE very often? 14:39
timotimo well, hopefully not :) 14:40
they're slow ;)
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ab6tract slower than doing the same check inside the sub anyway? 14:43
timotimo good question 14:44
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AlexDaniel jnthn: not sure if it helped, the issue is still there 14:47
not sure if it is the same one though, but the snippet does not run reliably 14:48
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timotimo #129781 14:54
synopsebot6 Link: rt.perl.org/rt3//Public/Bug/Displa...?id=129781
ab6tract luckily there is a smarter way to deal with it 14:56
the tricky thing about "symmetric difference" of a list of bags/mixes
is that order matters
which means you kind of lose the symmetry bit
so maybe it is fine that they get converted to Set if there is a list of them 14:57
timotimo here i have an explosion where MVM_string_gi_init falls over a b0rked "first" when called via MVM_repr_at_key_o
lizmat ab6tract: if the order matters, how can Set/Bag/Mix work, as they don't preserve order ?
timotimo from find_method, interestingly
that's funny. tried to MVM_dump_backtrace and it segfaulted here: 14:58
MVM_exception_backtrace_line (tc=tc@entry=0x7fffe8061cb0, cur_frame=0x45, not_top=0) at src/core/exceptions.c:317
317 MVMString *filename = cur_frame->static_info->body.cu->body.filename;
ab6tract lizmat: order of the list of Bags 14:59
[(^)] ($b1, $b2, $b3)
vs
[(^)] ($b3, $b1, $b2)
whereas $b1 (^) $b2 and $b2 (^) $b1 are symmetric 15:00
timotimo also, it looks like one commit i merged in is a bit ... explosive :) 15:02
ab6tract note that i belive you current implementation of [(^)] is valid for bags and mixes because it coerces them to sets
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ab6tract but it could be arguably confusing to have (^) return a bag when it is purely infix and a set when it is applied via reduce 15:03
i think this is where i got stuck before 15:04
then again, i would vastly prefer ( 'x' => 6 ).Bag (^) ( 'x' => 4).Bag to return bag(:x(2) than set() 15:07
gist.github.com/anonymous/c4c847ca...tfile1-txt 15:11
naive, but appears to work
timotimo AlexDaniel: it's memory-corrupty-explodey, but i can't get it to die earlier than the whole explosion from the --full-cleanup thing 15:13
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timotimo AlexDaniel: please know that i'm only not fixing that problem because it's really god damn not easy 15:20
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AlexDaniel I understand that 15:20
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timotimo that's why i prefer fiddling with optimizations instead 15:20
jnthn is currently investigating RT #129834, fwiw 15:21
timotimo synopsebot6: #129834
synopsebot6 Link: rt.perl.org/rt3//Public/Bug/Displa...?id=129834
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timotimo synopsebot6: #129834, 15:21
synopsebot6 Link: rt.perl.org/rt3//Public/Bug/Displa...?id=129834
timotimo did it not trigger because of the /me in front?
timotimo tests #129834
seems to be it
jnthn heh :)
jnthn is quite sure that's an eaiser bug to hunt down than this one :) 15:22
AlexDaniel timotimo: what do you mean by you can't get it to die before --full-cleanup?
timotimo well, every traceback that valgrind shows me includes MVM_gc_global_destruction in it
jnthn timotimo: I gave it a quick run and observed the same fwiw 15:23
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AlexDaniel how to disable --ful-cleanup? 15:26
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AlexDaniel l* 15:26
jnthn the perl6-valgrind-m script is what passes it 15:27
AlexDaniel can't see it 15:31
timotimo should be in the last line 15:32
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[Coke] are you using rakudobrew? 15:37
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[Coke] (in which case you want something like ~/.rakudobrew/moar-200364a/perl6-valgrind-m) rather than the one in your path 15:38
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AlexDaniel [Coke]: yeah, was trying to reverse-engineer that to figure it out… thank you very much! 15:41
ah, alright, got that going 15:43
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kyclark I’ve a little script where I’d like to “prompt” for a single character input (pastie.org/10953897). Is there any way to have “prompt” immediately return as soon as the user types any one thing (without hitting “Enter”)? 15:51
[Coke] prompt is meant for reading lines; if you just want the first thing, that's a different call. one sec. 15:52
timotimo you have to .read a single byte from STDIN
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timotimo make sure you're reading bytes, not graphemes, because that'd cause it to wait for stuff like composing characters to come in later 15:53
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[Coke] ah, that would explain why getc hangs 15:54
timotimo quite 15:55
AlexDaniel ouch
timotimo a sad consequence of doing things right
[Coke] ah, no, getc seems to require an enter?
timotimo probably also accepts a space
or a second letter
[Coke] timotimo: abcd didn't cause it to come back. 15:56
timotimo oh? interesting
"The operation is blocking and the stream may be buffered."
huh.
[Coke] um, even perl6 -e 'say $*IN.read(1)' requires an enter?
timotimo oh 15:57
you have to set the terminal to unbuffered first, of course
jnthn iirc it's about terminals
stackoverflow.com/questions/1798511...ny-getchar is a C program with the same issue
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timotimo and be sure to reset the state later, otherwise people are going to get mad at your program when it crashes :) 15:57
ilmari suffering with buffering
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[Coke] that seems like an excellent thing to mention in the docs. :) 15:59
timotimo we should probably point that out a bit more clearly on the doc page for it
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seatek is dd known to get easily confused with Match's ? 16:03
AlexDaniel seatek: by confused you mean what?
the way it prints stuff is confusing, yes
seatek it's hanging on me using 100% CPU whenever I use it on a match that includes an action
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seatek wheras say works fine 16:03
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seatek m: grammar G { token TOP {.*}}; class GC { method TOP ($/) { make $/ }}; my $m = G.parse('test here', actions => GC.new); dd $m; 16:04
timotimo hehe.
infinite mutual recursion, i bet
AlexDaniel ooops
camelia rakudo-moar a6eeaa: OUTPUT«(timeout)»
timotimo well, maybe not
but it could be
seatek m: grammar G { token TOP {.*}}; class GC { method TOP ($/) { make $/ }}; my $m = G.parse('test here', actions => GC.new); say $m;
camelia rakudo-moar a6eeaa: OUTPUT«｢test here｣␤»
seatek hehe
AlexDaniel committable6: 6c grammar G { token TOP {.*}}; class GC { method TOP ($/) { make $/ }}; my $m = G.parse('test here', actions => GC.new); dd $m; 16:05
that was a bad idea :)
seatek :)
AlexDaniel committable6: 2015.12 grammar G { token TOP {.*}}; class GC { method TOP ($/) { make $/ }}; my $m = G.parse('test here', actions => GC.new); dd $m;
seatek: actually, it makes sense 16:07
committable6 AlexDaniel, ¦«2015.12,2016.02,2016.03,2016.04,2016.05,2016.06,2016.07.1,2016.08.1,2016.09,2016.10,HEAD»: «timed out after 10 seconds, output»: «exit signal = SIGHUP (1)»
AlexDaniel, ¦«2015.12»: «timed out after 10 seconds, output»: «exit signal = SIGHUP (1)»
AlexDaniel seatek: and I'm not sure if it's dd's fault
yea, it's not… 16:08
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seatek yeah i don't know how dd processes objects differently than say 16:08
AlexDaniel I mean, you could argue that dd should not recurse that deep
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AlexDaniel seatek: well, look: 16:08
m: grammar G { token TOP {.*}}; class GC { method TOP ($/) { make ‘hello’ }}; my $m = G.parse(‘test here’, actions => GC.new); dd $m
camelia rakudo-moar a6eeaa: OUTPUT«Match $m = Match.new(ast => "hello", list => (), hash => Map.new(()), orig => "test here", to => 9, from => 0)␤»
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AlexDaniel seatek: the problem is that in your case ast is the same match object 16:09
it's like if you did $m.ast = $m
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seatek oo interesting 16:09
timotimo haha, $/ make $/, that's clever! 16:10
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AlexDaniel so in an attempt to print $m it has to print it's ast… which is $m. And so it goes on and on 16:10
timotimo hm. but we have perlseen and gistseen
we should be using that for this, too 16:11
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timotimo m: my @foo = 1, 2, 3; @foo.push(@foo); say @foo.perl 16:11
camelia rakudo-moar ed2631: OUTPUT«(my \Array_58637040 = [1, 2, 3, Array_58637040])␤»
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jsimonet Hello, I'm trying to write a grammar, and I would like to use an attribute to keep a state during parsing. Attributes are not allowed in rule/token/regexes, so I have to use a contextual variable but I don't know how to do this insided a token/rule. 16:26
viki jsimonet: why are they not allowed? 16:31
m: grammar Foo { has $!meow; token TOP { <foo> { say $!meow } }; token foo { .+ { $!meow = 42 } } }; Foo.new.parse: '42' 16:33
camelia rakudo-moar ed2631: OUTPUT«5===SORRY!5===␤Attribute $!meow not available inside of a regex, since regexes are methods on Cursor.␤Consider storing the attribute in a lexical, and using that in the regex.␤at <tmp>:1␤------> 3!meow; token TOP { <foo> { say $!meow } 7⏏5…»
viki I see.
jnthn :my $*FOO = 42;
jsimonet yes, this is this error.
jnthn (Just like a normal contextual decl, but with a : before it)
viki m: grammar Foo { has $!meow; token TOP { :my $*meow; <foo> { say $*meow } }; token foo { .+ { $*meow = 42 } } }; Foo.new.parse: '42' 16:34
camelia rakudo-moar ed2631: OUTPUT«42␤»
timotimo the $!meow obviously wants to go away
it serves no purpose there
except to confuse 16:35
viki right
jsimonet Is it the attribute wich is used, or $*meow is another variable ?
viki jsimonet: $*moew is just a dynamic variable
jsimonet ok
So I can use it in <?{ * }>?
viki Yeah 16:36
jsimonet Ok, is there a documentation page about this ?
viki jsimonet: docs.perl6.org/language/variables#The_*_Twigil
jsimonet: they're not grammar-specific, FWIW. They're just like normal variables, except they're dynamically scoped and not lexically scoped, like $foo is 16:37
jsimonet: you know about make/made, right?
(another way you can pass data around between tokens)
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jsimonet viki: yes, it's for constructing an AST. I wanted to keep separated the two (parsing and creating the AST). 16:38
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viki m: grammar Foo { token TOP { <foo> { say $/<foo>.made } }; token foo { .+ { make 42 } } }; Foo.new.parse: "42" 16:39
camelia rakudo-moar ed2631: OUTPUT«42␤»
viki OK
m: grammar Foo { token TOP { <foo> { say $/<foo>.made } }; token foo { .+ { make {:ast("meow"), :other-stuff(42)} } } }; Foo.new.parse: "42" 16:40
camelia rakudo-moar ed2631: OUTPUT«{ast => meow, other-stuff => 42}␤»
jsimonet I see :) 16:41
It seems my grammar now parses correctly, thank you!
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viki Any time. 16:42
FROGGS o/ 16:44
viki m: grammar Foo { has $.meow is rw; token TOP { <foo> { say $¢.meow } }; token foo { .+ { $¢.meow = 42 } } }; Foo.new.parse: "42"
camelia rakudo-moar ed2631: OUTPUT«(Any)␤»
jsimonet The :my is for defining in the current scope right ?
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viki Yeah 16:45
You can't use { ... } since that would just limit the scope to that block
jsimonet I tried :)
dalek c: bebe42e | (Tom Browder)++ | doc/Language/functions.pod6:
use possessive
 16:50
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tbrowder hi, #perl6 16:57
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viki \o\ 16:58
tbrowder hi, viki, is there anything like a c++ stream in p6?
viki Never used C++ 16:59
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tbrowder i would like use use some common code to write to either a file or a string 16:59
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[Coke] here's a simple example of how you override IO style methods to write to a string. 17:02
github.com/perl6/roast/blob/master...ngle.t#L28
tbrowder thanks, [Coke] 17:03
[Coke] this looks like a more fleshed out version that goes to a blob:
github.com/moznion/p6-IO-Blob
viki ISAGN for IO::FakeFile :) 17:04
Something that inherits IO::Handle and overrides all relevant methods to work with a string/Blob buffer 17:05
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viki IO::Blob seems to be it 17:07
tbrowder roger, thank! 17:10
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tbrowder looks like IO::String is in the ecosystem and IO::Blob is not 17:14
viki Wow, the "free" certs with letsencrypt sure have a hefty pricetag: letsencrypt.org/2016/11/01/launchi...paign.html Hard to imagine them raising $2,500,000/year considering a giant like Wikipedia pulls $75m 17:15
tbrowder: it's in it: modules.perl6.org/#q=Blob 17:16
AlexDaniel letsencrypt is quite big too 17:17
viki Is it? So far, the only people recommending it to me are nerds who give it as an excuse when I say certs are expensive. 17:19
Hard to imagine the same group being donors who consistently pull 2.5mil
tbrowder viki, thanks, i searched on IO:: and missed it
ref let's encrypt: i intend to contribute. had my Scottish side hanging hat on StartSSL which was great deal at approx $30/yr (unlimited certs)--but it's gone kaput now. i know there are other cheapies, out there but, but i like the automation aspects (but haven't tried them yet); 17:30
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moritz fwiw the *.perl6.org sites all use let's encrypt 17:33
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moritz as well as my personal sites 17:33
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moritz and the automation is awesome 17:33
investigating alternative clients is also worth it; I use simp_le for some of my pages 17:34
tbrowder moritz: have you found. p6 client for it? 17:35
moritz tbrowder: no; I tend to be pretty pragmatic when it comes to the infrastructure
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viki moritz: and how much do you plan to donate to letsencrypt? >:) 17:38
tbrowder well it's good to get yr rec, moritz
viki I'm reading their responses on HN thread and the person says this would be just a small part of their budget, so even if it fails, it's no biggie. 17:39
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moritz viki: not sure yet. Maybe O(50USD) 17:39
viki ( news.ycombinator.com/item?id=12847882 ) 17:40
moritz maybe more after I've held the P6 training, and got paid for it :-)
viki Did you just use the big-O notation with money? 17:41
:)
moritz I did, knowing it's not mathematically correct 17:42
viki :D
moritz I also use O(scary) for some algorithms 17:43
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geekosaur O(whoops) for algorithms with a good-looking big-O but terrible constants >.> 17:48
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nicq20 Hey-o 18:09
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seatek oh my gosh. i finally understand how actions tie into grammars, and what make and made does, as a user.. and it's not at all what the docs lead me to believe. i'm going to just wander around in circles now for a while waving my hands in the air and shaking my head and mumbling about stuff 18:27
then i'll write up a proper intro them 18:28
AlexDaniel seatek++ :) 18:29
seatek: so what are actions for? :)
seatek going to those docs to learn grammar is like going to someone to learn how to play the piano, and the drop a grand piano on your head and say here you go!
actions are for futzing with the grammar results... that's the easy bit.. the hard bit is figuring out what make and made is for 18:30
and how that ties into the whole picture of what you're trying to accomplish
hankache seatek++ 18:31
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tbrowder ref IO::Blob: i can write to a string (at least i got no pushback) but can't sa 18:35
y the string
viki seatek: there's a doc Issue for it, FWIW: github.com/perl6/doc/issues/897#is...-248087306 18:36
tbrowder: $io-blob-obj.data.encode.say 18:37
seatek i don't think anyone should be allowed to write anything about grammars that had anything to do with making them, or who has become completely fluent in them 18:38
viki Doesn't that apply to all docs? :)
seatek prolly ;) 18:39
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tbrowder m: use IO::Blob; my $str = ''; my $io = IO::Blob.open($str); $io.print("blah\n"); $io.data.say 18:39
camelia rakudo-moar ed2631: OUTPUT«===SORRY!===␤Could not find IO::Blob at line 1 in:␤ /home/camelia/.perl6␤ /home/camelia/rakudo-m-inst-2/share/perl6/site␤ /home/camelia/rakudo-m-inst-2/share/perl6/vendor␤ /home/camelia/rakudo-m-inst-2/share/perl6␤ CompUnit::Repo…»
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tbrowder ok, back to the 'puter 18:39
AlexDaniel seatek: well, then you'd have no docs on grammars at all :P 18:40
I wonder if that would've been better
viki tbrowder: you're missing .encode. .data is a Blob
tbrowder: another method: github.com/moznion/p6-IO-Blob/blob...#L256-L258
AlexDaniel seatek: but yes, I really think that you can make it better, so hoping to see a PR :)
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seatek AlexDaniel: no the docs were great - I couldn't have learned without them, and without our conversation last night here. it took experimenting on my part though with say and dd to finally understand 18:46
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seatek (and unit tests with varying inputs ;) ) 18:47
viki m: gist.github.com/zoffixznet/3598d27...e142797093 18:48
camelia rakudo-moar ed2631: OUTPUT«5===SORRY!5=== Error while compiling <tmp>␤The following packages were stubbed but not defined:␤ IO::Blob␤at <tmp>:243␤------> 3<BOL>7⏏5<EOL>␤ expecting any of:␤ statement end␤»
viki How come it says that?
seatek AlexDaniel: i plan on writing something up tonight, after a shower. 18:50
moritz viki: looks like a bug
AlexDaniel committable6: 6c gist.githubusercontent.com/zoffixz...51a0/p6.p6
committable6 AlexDaniel, Successfully fetched the code from the provided URL.
AlexDaniel, gist.github.com/bbfc1840a530f78d73...69ebf6a1d1
viki tbrowder: sorry, .decode, not .encode 18:51
AlexDaniel m: class IO::Blob { … } 18:52
camelia rakudo-moar ed2631: OUTPUT«5===SORRY!5=== Error while compiling <tmp>␤The following packages were stubbed but not defined:␤ IO::Blob␤at <tmp>:1␤------> 3class IO::Blob { … }7⏏5<EOL>␤ expecting any of:␤ postfix␤ statement end␤»
viki m: class IO::Blob { … }; class IO::Blob {}
camelia rakudo-moar ed2631: OUTPUT«5===SORRY!5=== Error while compiling <tmp>␤The following packages were stubbed but not defined:␤ IO::Blob␤at <tmp>:1␤------> 3class IO::Blob { … }; class IO::Blob {}7⏏5<EOL>␤ expecting any of:␤ postfix␤ stateme…»
viki m: class IO::Blob { ... }; class IO::Blob {}
camelia rakudo-moar ed2631: OUTPUT«5===SORRY!5=== Error while compiling <tmp>␤The following packages were stubbed but not defined:␤ IO::Blob␤at <tmp>:1␤------> 3lass IO::Blob { ... }; class IO::Blob {}7⏏5<EOL>␤ expecting any of:␤ postfix␤ statemen…»
viki star: class IO::Blob { ... }; class IO::Blob {} 18:53
camelia star-m 2016.04: OUTPUT«5===SORRY!5=== Error while compiling <tmp>␤The following packages were stubbed but not defined:␤ IO::Blob␤at <tmp>:1␤------> 3lass IO::Blob { ... }; class IO::Blob {}7⏏5<EOL>␤ expecting any of:␤ postfix␤ statement en…»
18:53 silug left
viki weird... 18:53
Oh
m: class Meow::Blob { ... }; class Meow::Blob {}
camelia ( no output )
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moritz is it because IO is a role? 18:53
18:53 cdg left
viki Prolly. I think there's a ticket for this sort of package clashes 18:53
moritz m: role Meow { }; class Meow::Blob { ... }; class Meow::Blob {}
camelia ( no output )
moritz m: role Meow { ... }; role Meow { }; class Meow::Blob { ... }; class Meow::Blob {} 18:54
camelia ( no output )
tbrowder ok, that works, but, so far, i don't see that i can use the io handle like a file handle, so it does no good for my use case
viki It's that IO:: is provided by core.
tbrowder: IO::Blob *is* a IO::Handle.
moritz m: class Str::Foo { ... }; class Str::Foo { }
camelia rakudo-moar ed2631: OUTPUT«5===SORRY!5=== Error while compiling <tmp>␤The following packages were stubbed but not defined:␤ Str::Foo␤at <tmp>:1␤------> 3ass Str::Foo { ... }; class Str::Foo { }7⏏5<EOL>␤ expecting any of:␤ postfix␤ statemen…»
viki tbrowder: so I'm unsure what sort of use you're not achieving
tbrowder yes, but i want to write the resulting string to a file 18:55
viki tbrowder: which file?
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viki And this should be the ticket, though seems like RT is down: rt.perl.org/Public/Bug/Display.htm...et-history 18:56
oh, works now.
tbrowder any file i want to open for writing. the whole point is to be able to use lots of the same code for either (1) writing to a real string or (2) an open file handle just by selecting the proper IO::Handle 18:58
viki tbrowder: right, so one IO::Handle is the proper file and another IO::handle is the IO::Blob. Your IO::Handle handling code will work equally the same with a basic IO::Handle as it does with IO::Blob. 18:59
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viki And the "just by selecting" bit will select between those 19:00
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tbrowder ok, i'll see if i can get it to work. since the writable string is a blob, is there a foolproof way, in a script, to convert it to a real string? 19:07
viki Not really. 19:08
You need to know what encoding that data is in.
But same applies to a file. 19:09
tbrowder but since i create the blob, i should know the encoding. 19:10
viki Sure. 19:11
s: open("/tmp/foo", :w), 'seek' 19:12
SourceBaby viki, Sauce is at github.com/rakudo/rakudo/blob/ed26...le.pm#L627
tbrowder here's what i want to be able to do: write to a blob, convert it to a real string, then choose to write it to a file or just return to as a string to the caller
viki I thought you said you knew the encoding? So why is the blob envolved at all? 19:14
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viki m: my $f = open("/tmp/foo", :rw); sub handling-code { $^file.write: "meows".encode; }; handling-code $f; $f.seek: 0, SeekFromBeginning; $f.slurp-rest.say 19:15
camelia rakudo-moar ed2631: OUTPUT«open is disallowed in restricted setting␤ in sub restricted at src/RESTRICTED.setting line 1␤ in sub open at src/RESTRICTED.setting line 9␤ in block <unit> at <tmp> line 1␤␤»
viki baahh 19:16
m: class IO::Blob { has $!data; method write ($v) { $!data = $v }; method seek ($,$) {}; method slurp-rest { $!data.decode } }; my $f = IO::Blob.new; sub handling-code { $^file.write: "meows".encode; }; handling-code $f; $f.seek: 0, SeekFromBeginning; $f.slurp-rest.say
camelia rakudo-moar ed2631: OUTPUT«meows␤»
viki ^ that's what I imagined you were talking about when you said you wanted to use same code for file and string writing.
But now what you're saying sounds like you just want a conditional that spurts into a file :|
multi method result ($file) { $file.IO.spurt: $!data }; multi method result { $!data } # and I don't see why blobs need to be involved unless you're dealing with bytes 19:19
tbrowder yes, but i wanted to write to the handle if possible, but i see that still has to be converted from blob to string, so just writing normally to a string first and then writing it to a file would work much easier.
19:19 ab6tract joined
ab6tract RT #124529 19:19
synopsebot6 Link: rt.perl.org/rt3//Public/Bug/Displa...?id=124529
viki That's a terrible skip description :/ 19:21
m: sub showkv($x) { $x.keys.sort.map({ $^k ~ ':' ~ $x{$k} }).join(' ') }; sub symmetric-difference($a, $b) { ($a (|) $b) (-) ($b (&) $a) }; my $s = set <blood love>; my $b = bag <blood blood rhetoric love love>; is showkv($s (^) $b), showkv(symmetric-difference($s, $b)), "Bag symmetric difference with Set is correct"; 19:24
camelia rakudo-moar ed2631: OUTPUT«5===SORRY!5=== Error while compiling <tmp>␤Undeclared routine:␤ is used at line 1␤␤»
viki m: use Test; sub showkv($x) { $x.keys.sort.map({ $^k ~ ':' ~ $x{$k} }).join(' ') }; sub symmetric-difference($a, $b) { ($a (|) $b) (-) ($b (&) $a) }; my $s = set <blood love>; my $b = bag <blood blood rhetoric love love>; is showkv($s (^) $b), showkv(symmetric-difference($s, $b)), "Bag symmetric difference with Set is correct";
camelia rakudo-moar ed2631: OUTPUT«not ok 1 - Bag symmetric difference with Set is correct␤␤# Failed test 'Bag symmetric difference with Set is correct'␤# at <tmp> line 1␤# expected: 'blood:1 love:1 rhetoric:1'␤# got: 'rhetoric:True'␤»
viki Is that the only difference?
committable6: HEAD use Test; sub showkv($x) { $x.keys.sort.map({ $^k ~ ':' ~ $x{$k} }).join(' ') }; sub symmetric-difference($a, $b) { ($a (|) $b) (-) ($b (&) $a) }; my $s = set <blood love>; my $b = bag <blood blood rhetoric love love>; is showkv($s (^) $b), showkv(symmetric-difference($s, $b)), "Bag symmetric difference with Set is correct";
committable6 viki, ¦«HEAD»: not ok 1 - Bag symmetric difference with Set is correct␤␤# Failed test 'Bag symmetric difference with Set is correct'␤# at /tmp/VQ4MbhbPTO line 1␤# expected: 'blood:1 love:1 rhetoric:1'␤# got: 'rhetoric:True' «exit code = 1»
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moritz fwiw the p5 advent calendar had submission deadline yesterday 19:26
should we start thinking about our own?
viki Sure, why not.
Get people to commit to write early. 19:27
moritz who wants to contribute? I'd write one article
tbrowder viki: this is example-sig sub(..., IO::Handle :$fh, Str :$str is rw, ...) {} 19:28
TimToady waves from the PVR aeropuerto
viki Does it have to be a strictly technical article?
[ptc] o/
moritz viki: no
viki: what do you have in mind? 19:29
viki I can write one then.
tbrowder then gen the internal string, if fh is defined, spurt to it, elsif str is defined assign to it (test in some desired order) 19:30
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dalek : 1969834 | moritz++ | misc/perl6advent-2016/schedule:
Empty schedule for Perl 6 advent calendar 2016
 19:31
moritz ok, slots are up for taking
viki moritz: haven't decided yet, but something about how people worry about speed, bugs, or marketing. I recall even last Christmas jberger was freaking out about not enough "publicity". So I kinda want to write some inspirational type of thing, rather than some technical post.
tbrowder shouldn't that work, and be reasonably efficient (except for space)?
moritz viki: sounds awesome 19:32
viki tbrowder: the way I'd do it is: method !do-stuff {...}; multi method (IO::Handle $fh) { $fh.spurt: self!do-stuff; }; multi method (Str $s is rw) { $s = self!do-stuff }
and do-stuff does your "write to string" thing 19:33
moritz wants to write about his book project
tbrowder that's why i wanted to have choice of handle be transparent to avoid genning big str if not needed
btw, this is not a class method
viki Well, same with subs, just have one that's private 19:34
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tbrowder gotcha, but it still will have the space overhead if writing to a file, guess there is currently no way around it currently. something for 6.c? 19:36
uh, 6.d?
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viki Then the first version is what you'd use 19:37
s: open("/tmp/foo", :w), 'write' 19:38
SourceBaby viki, Sauce is at github.com/rakudo/rakudo/blob/94d1...le.pm#L636
viki tbrowder: so something like: sub do-stuff ($fh) { $fh.write: "meow".decode; }; multi sub stuff (IO::Handle $fh) { do-stuff $fh }; multi sub stuff (Str $s is rw) { my IO::Blob $b = .new; do-stuff $b; $s = $b.data.encode } 19:40
m: "x".encode
camelia ( no output )
viki s/encode/decode/ and vice-versa 19:41
dalek : 793d377 | (Zoffix Znet)++ | misc/perl6advent-2016/schedule:
Book Dec. 2 advent
 19:43
viki Zoffix can switch dates if anyone wanted the 2nd :)
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FROGGS does he? :o) 19:43
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viki Yup :) 19:46
I've checked ;)
tbrowder: I guess there's no need for the do-stuff sub at all, just let it be the IO::Handle candidate and use it in the Str candidate 19:47
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moritz perlgeek.de/blog-en/perl-6/2016-advent-cfp.html (lizmat, would be nice if you could mention that in the next p6weekly) 19:51
masak moritz: to clarify, "midnight (UTC)" or some other midnight? 19:55
masak considers contributing this year
masak .oO( oh, the 'mu' repository -- sure, that's where we do perl6advent scheduling! ) :P 19:56
masak .oO( why's it called 'mu'? uuuurhm, because it's the "Perl 6 Muadvent"...? alright, alright, I don't know! ) 19:57
DrForr Reference to the appropriate k\"oan, I suppose. 20:00
masak m: say Mu 20:01
camelia rakudo-moar 94d19e: OUTPUT«(Mu)␤»
moritz masak: should we start a new repo?
masak no no no, I'm just being facetious
as usual :>
[ptc] as musual?
masak *groan*
it's... an excellent repo to do planning in. I wouldn't want it any other way.
m: say (Mu) 20:02
camelia rakudo-moar 94d19e: OUTPUT«(Mu)␤»
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masak m: say (((((Mu))))) 20:02
camelia rakudo-moar 94d19e: OUTPUT«(Mu)␤»
masak (now with extra bass)
moritz masak: well, we could have a separate repo just for the p6advent planning, so that nobody needs to clone that huge repo just for a one-line patch 20:03
but so far, I haven't cared enough to migrate
masak me neither
I kinda hope we keep doing it in mu :)
geekosaur just misread Muadvent as Mudvent >.> 20:04
masak people who find cloning burdensome can do it all in the github web interface, I guess
geekosaur: ooh, that sounds like a blog post in itself! :D
"implementing Perl 6 Mudvent"
dalek : 2637c13 | moritz++ | misc/perl6advent-2016/schedule:
Claim an advent spot
 20:07
tbrowder viki: thank you!
moritz I used to hate git's " ! [rejected] master -> master (fetch first)"
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moritz now I love it, because it means somebody else contributed 20:08
masak moritz: "curse those other people getting in the way of my push!" :P
lizmat moritz: will do 20:09
masak moritz: I find when teaching and explaining Git (or Mercurial), it really helps to explain the difference between "you have a conflict" and "someone else pushed"
[ptc] I once took masak's advice and now use `git pull --rebase` liberally; it's now in my muscle memory
masak [ptc]: I said that? good :)
[ptc] masak: yup! And it's been really handy!
masak [ptc]: mostly I think merges-due-to-pulling are arbitrary and annoying
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[ptc] I do too. I worked on one of Ovid's projects and it came in very handy there as he was quite strict about a linear git history 20:10
masak they're the Git log equivalent of "this week on Twitter, I gained 3 followers and lost 2 followers!" :) 20:11
[ptc] I find the extra branches one gets from e.g. GitHub pull request merges distracting when looking at the history
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tbrowder now for another sub question: given a sub that operates on an input string, should a module author provide two versions, one that modifies the input string (is rw) or one that returns the new string, or both? 20:12
viki [ptc] FWIW, this happened precisely due to rebase being in muscle memory :) perl6.party/post/I-Botched-A-Perl-6...ing-My-Job
masak [ptc]: sometimes I rebase and merge locally even with PRs, so that I don't get the merge commit.
viki tbrowder, one that returns
masak tbrowder: returns 20:13
tbrowder: because the other one can be had with $str.=themethod
DrForr cusr time for Template::Toolkit fell drastically over the last release; I was at 64.02, down to 48.96 avg.
[ptc] viki: I read that, and thought it was due to the edit on GH while the release spectests were running and then the commits for the release being out of kilter
tbrowder but this is a sub, not a class method
[ptc] viki: I *really* like the idea of a bot to build perl 6; that was awesome stuff. 20:14
[ptc] wonders if it could ever work for perl 5...
masak tbrowder: $str.=&thesub 20:16
viki [ptc] no, it was due to rebase. The github edit was a technically post-release commit.
[ptc] viki: ah, ok
masak m: sub flip-uc($str) { $str.flip.uc }; my $str = "hiiii"; $str .= &flip-uc; say $str 20:17
camelia rakudo-moar 94d19e: OUTPUT«IIIIH␤»
tbrowder masak, thanks, p6 is great!
masak ...it's OK, I guess... :P
tbrowder i'll take that as an humble reply... 20:19
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masak humility would imply that I had a bigger part in bringing it about than I actually do :) 20:21
ergo, I'm just being silly
viki
.oO( or you're humbly downplaying your part... )
 20:22
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masak *meta*-humility!? why, I'd never... 20:23
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lizmat
.oO( macro-humility? :-)
 20:24
masak macros are many things, but they are hardly humble. 20:25
masak .oO( wait, you mean before or after they melt your brain? )
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dalek c: 98a7489 | (Jan-Olof Hendig)++ | doc/Type/Blob.pod6:
Wrote docs for Blob.bytes
 20:34
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harmil_wk Been asking myself: what would P6CRE look like... Last night I started writing up a rough spec: gist.github.com/ajs/72fecbbe8e714c...a171e74186 20:43
masak harmil_wk: interesting! 20:47
samcv so i'm working with channels, and i'm trying to get this to go multi threaded vpaste.net/1XuaC 20:52
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samcv atm it works fine, but i would like it to spawn extra workers when thre are things in the channel 20:52
i tried, do for $chan.receive -> $file { start { code here } } but that didn't work 20:53
maybe if i put a start block inside the loop? hm 20:55
let me try that. any tips you guys have would be great
oh nice. actually that did work :), now just need to make it not exit the loop until all the promises are kept. 20:57
tbrowder masak: i'm looking at that sub again. it is a bit more complex. one version returns two strings (the input one as modified), and the other just returns just the new string and modifies the input string inplace. the sub's purpose is to split an input line into 2 parts 20:59
samcv domy $all-done = Promise.allof(@promises); ## doing this, the promise returned by allof will be static or dependent on the contents of @promises? 21:01
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samcv s/domy/doing 21:01
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ugexe m: await Promise.allof(start { sleep 1; say time; }, start { sleep 5; say time() }); say "done"; 21:09
camelia rakudo-moar 94d19e: OUTPUT«5===SORRY!5=== Error while compiling <tmp>␤Undeclared routine:␤ time used at line 1␤␤»
ugexe m: await Promise.allof(start { sleep 1; say time; }, start { sleep 5; say time; }); say "done"; 21:10
camelia rakudo-moar 94d19e: OUTPUT«1478034618␤1478034622␤done␤»
ugexe it will depend on the result of 'allof' the promises
tbrowder masak: so i'm not sure how to do the .= trick. (($str.=&sub($str, args...)), $str2); # ?? 21:12
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masak tbrowder: I'm not sure either. 21:14
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tbrowder i don't think a subs return type works for multi sub selection... 21:16
nor the trait on an arg
the way i'm doing it now is the way p6 has two names for some routines like X and X-rw 21:18
ugexe m: sub foo($, $x) { $x }; my @a = 1..10; @a .= &foo(1); say @a;
camelia rakudo-moar a1347c: OUTPUT«[1]␤»
ugexe m: sub foo($x) { $x.grep(* > 5) }; my @a = 1..10; @a .= &foo; say @a; 21:19
camelia rakudo-moar a1347c: OUTPUT«[6 7 8 9 10]␤»
samcv ugexe, i've almost got it. vpaste.net/A55b9 21:20
it misses two files though, comparing the number of files to what it outputs at the end
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samcv but it's close 21:20
i'm thinking maybe it checks "last if $chan.closed and $group" before it pushes the promises above it? hm 21:22
ugexe i think you want react/whatever block construct 21:23
whenever^
samcv i will look at that, thanks ugexe 21:24
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samcv oo i got it working. didn't use react, but got the times it loops down from 3500 times to 1400 times and now processes all 508 files 21:49
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grondilu ls 21:52
samcv ls = lets see? vpaste.net/9vJny 21:54
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samcv for some reason if i do: while ! $chan.closed or ! Promise.allof(@promises) i get a segfault 21:54
at the end of the program
but like in the link works awesome 21:55
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samcv weird actually... i removed the print messages in the loop and now it's not doing all of them.. i guess i will have to figure out what's happening 22:06
seems milliseconds matter 22:07
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samcv All promises done It's closed! pre: 508 mid: 496 post: 508 loop times: 999 Total promises: 508 22:20
vpaste.net/oXU5r changed the code, at least i see what's going on more
so it is creating all 508 promises properly (that's the # of files there are) but i think it never re-evaluates whether all promises are complete to be updated to the latest number of promises 22:21
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tbrowder ref sub sigs: is there a way to constrain a param to one of two types? 22:44
i mean in the same sig, not using multi dispatch 22:48
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ilmari was expecting sub foo (Int|Str $x) to work, but no 22:54
m: sub foo (Int|Str $x) { say $x }; foo(42); foo("bar"); foo(4.2)
camelia rakudo-moar a1347c: OUTPUT«===SORRY!===␤No compile-time value for Str␤»
jnthn $x where Int|Str 22:55
|c is the argument capture syntax, so we can't have Int|Str there
ilmari ah
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tbrowder hm maybe something foo($f where { $f ~~ io.handle or $f ~~ Str}, ...) 23:00
using the precise correct syntax of course 23:01
that is described in the docs, types => signature 23:02
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tbrowder i'll experiment with that in a script...nite p6 people 23:04
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AlexDaniel ilmari: the error message is LTA and it would be nice to at least have a ticket for that 23:08
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samcv it turns out it is actually working correctly... but. somehow it's not iterating the variable properly... WTF 23:14
vpaste.net/ANiHQ i get Start of start: 502 End start: 506 Looped: 919 Total prom: 508 but program.p6 | wc -l gives me 508, the right number 23:15
but the variables aren't being iterated properly. this makes no sense
is this a bug?
jnthn ++ is not atomic 23:16
So $start_prom++; is a data race
samcv ah 23:17
and here i was tearing my hair out for nothing :P
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samcv jnthn, what should i use instead? 23:20
what should i search for to read more about this in perl 6, so i can fully understand it
jnthn I'd probably have set off some workers that each had a react block, and did whenever on the channel 23:23
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jnthn Or at least used that as my main loop 23:23
AlexDaniel another way is to use Lock, but that's probably not the best solution
jnthn A react block enforces mutual exclusion, which would deal with your data race 23:24
samcv ah got it jnthn. so the issue is they're trying to iterate the same variable at the same time and so messes it up. i will look at that
jnthn Yeah, you can use an old fashioned lock too, but `if $chan.poll -> $file {` in a while loop means it'll busy-wait
Whereas a react/whenever woudln't
*wouldn't 23:25
AlexDaniel why do you even need $start_prom and $end_start? 23:26
jnthn guessed they were for debugging
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AlexDaniel the idea of firing up a bunch of start {} blocks at the same time is also weird 23:29
you probably want a fixed number of worker threads, in which case hyper/race may be more suitable… if only they worked 23:31
I usually do something like for ^4 { start { … } } 23:32
and in each start block I pull required data from a channel (which you already have)
jnthn Firing off a bunch of start blocks is fine really 23:33
They aren't a thread each; you're just giving them to the scheduler 23:34
Sleep time for me; 'night 23:35
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AlexDaniel yeah, exactly, you are polluting the scheduler. 23:39
samcv good idea AlexDaniel. 23:40
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samcv yeah those things were just for debugging jnthn. does anybody know how i can make stdout.tap feed only full lines? $proc.stdout.tap( -> $v { for $v.lines { $chan.send($_) } }); this will send on partial lines 23:43
it says tap outputs a supply object, and supply has a lines method. maybe i'm not calling it right 23:48
ah i got it :D. sorry for all the questions 23:51
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