#crystal-lang on 2015-05-13 — irc logs at freenode.irclog.whitequark.org

2015-05-09 00:24 jhass changed the topic of #crystal-lang to: The Crystal programming language | http://crystal-lang.org | Crystal 0.7.1 | Paste > 3 lines of text to https://gist.github.com | GH: https://github.com/manastech/crystal - Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/ | Logs: http://irclog.whitequark.org/crystal-lang

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04:45 <Dreamer3> i thought of throwing together REPL the other day

04:46 <Dreamer3> probably not an easy thing to do though

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04:59 <strcmp1> repls are the envy of compiled languages :p

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07:34 <unshadow_> >> a = []

07:34 <DeBot> unshadow_: Syntax error in eval:3: for empty arrays use '[] of ElementType'

07:34 <unshadow_> what does that means ?

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07:37 <BlaXpirit> unshadow_, arrays have a type associated with them

07:37 <BlaXpirit> when you write [5] it knows it's an array of int

07:37 <BlaXpirit> but what is [] ?

07:37 <unshadow_> an empty array

07:37 <unshadow_> that I can populate later on

07:37 <BlaXpirit> there is no such thing

07:38 <BlaXpirit> as "just" an array

07:39 <BlaXpirit> why am i bothering

07:39 <BlaXpirit> it's in the doc

07:39 <unshadow_> Looking now

07:39 <unshadow_> thanks for bothering

07:42 <unshadow_> >> a = Array(Int32).new

07:42 <DeBot> unshadow_: []

07:43 <unshadow_> >> a = Array(Int32).new || << 100*'a'

07:43 <DeBot> unshadow_: Syntax error in eval:3: unexpected token: <<

07:43 <unshadow_> >> a = Array(Int32).new; a << 100*'a'

07:43 <DeBot> unshadow_: Error in line 3: no overload matches 'Int32#*' with types Char

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07:43 <unshadow_> >> a = Array(Int32).new; a << 100*1

07:43 <DeBot> unshadow_: [100]

07:44 <unshadow_> >> a = [] of Int32

07:44 <DeBot> unshadow_: []

07:44 <unshadow_> ok got it :)

07:45 <unshadow_> >> a = Array(Char).new; a << 10*'a'

07:45 <DeBot> unshadow_: Error in line 3: no overload matches 'Int32#*' with types Char

07:45 <unshadow_> >> a = Array(Char).new; a << 'a'

07:45 <DeBot> unshadow_: ['a']

07:46 <notfowl> >> [] of Char

07:46 <DeBot> notfowl: []

08:03 <unshadow_> >> a = [['a'], ['b']]

08:03 <DeBot> unshadow_: [['a'], ['b']]

08:03 <unshadow_> >> a = [['a'], ['b']]; a[1]

08:03 <DeBot> unshadow_: ['b']

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08:10 <unshadow_> >> a = [['a'], ['b']]; a.include?('b')

08:10 <DeBot> unshadow_: Error in line 3: undefined method 'include?' for Array(Array(Char)) (did you mean 'includes?'?)

08:10 <unshadow_> >> a = [['a'], ['b']]; a.includes?('b')

08:10 <DeBot> unshadow_: false

08:10 <unshadow_> >> a = [['a'], ['b']]; a.includes?(['b'])

08:10 <DeBot> unshadow_: true

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08:15 <unshadow_> Is there a way to tell crystal to use multiple cores in comipling ? (like make -j option) ?

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09:06 <jhass> unshadow_: mh, maybe really write PMs to the bot ;)

09:07 <unshadow_> haha yeha ... sorry :(

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09:28 <unshadow_> jhass, I think i broke the bot...

09:31 <unshadow_> >> puts "hi"

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09:43 <jhass> weird, something crashed the socket

09:47 <unshadow_> I think I found a bug, I'll try to recreate for a sec

09:48 <unshadow_> Socket crashed again right ?

09:48 <unshadow_> >> puts "hi"

09:48 <unshadow_> yeha ..

09:50 <unshadow_> It comes from crystal compiler, it handles big array appends very poorly it seems

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09:52 <unshadow_> Yeha, I can see you answered the bug I opend about it, I'll stop sending large arrays to the bot, sorry

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09:55 <jhass> meh, it's my fault for not limiting the memory I guess

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09:57 <jhass> unshadow_: try one more time

09:58 <jhass> >> "hi"

09:58 <DeBot> jhass: "hi"

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10:21 <unshadow_> >> puts "hi"

10:21 <DeBot> unshadow_: hi

10:21 <unshadow_> you want me to try the prablomatic command ?

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10:32 <jhass> yes

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10:34 <unshadow_> >> puts "hi"

10:34 <unshadow_> crashed again ?

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10:53 <jhass> mh, yeah

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10:56 <unshadow_> jhass, are you running it inside a container ?

10:56 <jhass> sure

10:57 <jhass> looks like the amount of output is what's causing trouble

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10:59 <unshadow_> maybe filter for *.times and see that it's not above 100 or 1000

11:00 <jhass> nah, that would be cosmetic

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11:01 <jhass> >> "a"*100000

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11:02 <jhass> >> "hi"

11:02 <DeBot> jhass: "hi"

11:02 <jhass> >> "a"*100000

11:08 <DeBot> jhass: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ...

11:08 <jhass> looks like it doesn't trigger playpens timeout :/

11:09 <unshadow_> a = 'a'; b = [] of Char; 100000.times do {b << a} end; c = [] of Array; 100000.times do {c << b} end; puts c

11:09 <jhass> yeah, the a's came because I killed the process

11:09 <unshadow_> Oh

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11:30 <jhass> haha, happens on 32bit only

11:30 <jhass> interesting how the 32bit only bugs start to increase nowadays

11:33 <unshadow_> are you upgrading to 64 ?

11:33 <jhass> the VM? no

11:33 <jhass> https://github.com/thestinger/playpen/issues/50

11:34 <unshadow_> no one ever checks 32 bit anymore hahah

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11:56 <unshadow_> jhass, I think i can baypass the systems security and write a file

11:57 <jhass> writing a file is not a security issue

11:57 <jhass> come back if you can write a file outside /tmp and /home/ ;)

11:57 <unshadow_> intresting :) I'll try now

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11:58 <jhass> but even then, you didn't write anything to the host

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12:01 <unshadow_> I'm getting this error: "in /usr/lib/crystal/event/event.cr:66: field 'tv_sec' of struct LibC::TimeVal has type Int32, not Int64"

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12:02 <ddfreyne> buffer -1

12:02 <jhass> unshadow_: yeah, sleep is broken on 32bit atm

12:03 <unshadow_> Also "file" ? in /usr/lib/crystal/file.cr:24: undefined method 'length' for Char

12:03 <ddfreyne> Oops.

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12:05 <jhass> >> File.open("foo", 'w')

12:05 <DeBot> jhass: in /usr/lib/crystal/file.cr:24: undefined method 'length' for Char

12:05 <jhass> >> File.open("foo", "w")

12:05 <DeBot> jhass: #<File:0x9F1CFC8 @fd=6, @event=nil, @readers=nil, @writers=nil, @closed=false, @path="foo">

12:06 <jhass> could be improved easily, https://github.com/manastech/crystal/blob/master/src/file.cr#L24 ;)

12:06 <jhass> PRs welcome

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12:09 <unshadow_> >>%x(touch /tmp/bar.test); file = Dir.glob("/tmp/*")[1]; %x(echo "#!/bin/bash\r\ntouch /var/log/test.log\r\n" >> #{file}); system("/bin/bash file"); a = Dir.glob("/var/log/*"); p a

12:09 <DeBot> unshadow_: /usr/bin/file: /usr/bin/file: cannot execute binary file

12:09 <unshadow_> >>%x(touch /tmp/bar.test); file = Dir.glob("/tmp/*")[0]; %x(echo "#!/bin/bash\r\ntouch /var/log/test.log\r\n" >> #{file}); system("/bin/bash file"); a = Dir.glob("/var/log/*"); p a

12:09 <DeBot> unshadow_: /usr/bin/file: /usr/bin/file: cannot execute binary file

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12:10 <jhass> >> File.write("/var/log/test.log", "1")

12:10 <DeBot> jhass: Errno: Error opening file '/var/log/test.log' with mode 'w': Read-only file system

12:10 <jhass> that's all you try to do, in a convoluted way ;)

12:13 <unshadow_> wait wait, I'll figure something hahah

12:13 <unshadow_> maybe ....

12:13 <jhass> >> system("df -T /home/crystal")

12:13 <DeBot> jhass: Filesystem Type 1K-blocks Used Available Use% Mounted on

12:13 <jhass> >> `df -T /home/crystal`.lines.last

12:13 <DeBot> jhass: "none tmpfs 1034064 692 1033372 1% /home/crystal"

12:13 <jhass> just fyi ;)

12:14 <unshadow_> >> a = system("df -T /home/crystal"); p a

12:14 <DeBot> unshadow_: Filesystem Type 1K-blocks Used Available Use% Mounted on

12:14 <unshadow_> >> a = %x(df -T /home/crystal); p a

12:14 <DeBot> unshadow_: "Filesystem Type 1K-blocks Used Available Use% Mounted on\nnone tmpfs 1034064 668 1033396 1% /home/crystal\n"

12:15 <unshadow_> Damn...

12:28 <unshadow_> Trying to compile GHOST vunrabilty exploit via 1 liner is hard..

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13:03 <lokulin> >> "word word".split /\b/

13:03 <DeBot> lokulin: ["word", " ", "word"]

13:04 <lokulin> >> "foo".match(/(foo|bar)/)[0]

13:04 <DeBot> lokulin: Error in line 3: undefined method '[]' for Nil

13:05 <lokulin> >> "foo".match(/(foo|bar)/)

13:05 <DeBot> lokulin: #<MatchData "foo" 1:"foo">

13:06 <jhass> match may return nil so [0] chokes

13:06 <jhass> >> "foo".match(/foo|bar/).try &.[0]

13:06 <DeBot> jhass: "foo"

13:07 <lokulin> thanks

13:07 <lokulin> trying to convert a little toy Ruby project to Crystal..so far so good. :-)

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13:36 <unshadow_> jhass, how can I check running thread ? I see that Thread.current is not avilable

13:37 <jhass> then you probably have to implement it ;)

13:40 <unshadow_> that could be cool, do I need to do it in C ?

13:42 <unshadow_> >> LibPThread.current

13:42 <DeBot> unshadow_: Error in line 3: undefined fun 'current' for LibPThread

13:42 <unshadow_> >> LibPThread.self

13:42 <DeBot> unshadow_: Error in line 3: undefined fun 'self' for LibPThread

13:43 <lokulin> Really cool project guys.

13:43 <unshadow_> >> LibPThread.pthread_self

13:43 <DeBot> unshadow_: Error in line 3: undefined fun 'pthread_self' for LibPThread

13:43 <unshadow_> >> LibPThread.pthread_self()

13:43 <DeBot> unshadow_: Error in line 3: undefined fun 'pthread_self' for LibPThread

13:44 <unshadow_> Yeha, it is ! as a ruby developer this is a dream comes true

13:44 <lokulin> Going to have to show this to all the ruby devs at work.

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13:45 <vikaton> hows the playpen going?

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15:18 <crystal-gh> [crystal] eidge opened pull request #658: Fix "Installing" docs link (master...patch-1) http://git.io/vUiB5

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15:31 <crystal-gh> [crystal] asterite closed pull request #658: Fix "Installing" docs link (master...patch-1) http://git.io/vUiB5

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19:24 <jhass> >> "a"*100000

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21:01 <vikaton> How do I write to file without over writing the whole thing?

21:02 <kulelu88> vikaton: try appending

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21:12 <vikaton> ah that worked

21:13 <kulelu88> :) Similar to python

21:13 <vikaton> now this part

21:14 <vikaton> how can I make a crystal program run in the bg, but still get some I/O ?

21:14 <vikaton> or just Input in this case

21:15 <kulelu88> bg?

21:15 <kulelu88> oh background

21:15 <kulelu88> define where the input is coming from and what input it is

21:17 <vikaton> kulelu88: input is everywhere, every keystroke

21:18 <jhass> read the right input device in /dev/

21:19 <kulelu88> oh you're building a keylogger for microsoft devices. aah okay

21:19 <jhass> maybe bind a lib that abstracts that, I think libinput or something fell out of the wayland project

21:19 <vikaton> its not microsoft

21:19 <vikaton> yet anyway

21:19 <kulelu88> i'm kidding =)

21:19 <vikaton> oh lol

21:20 <vikaton> I'm using curses jhass

21:20 <vikaton> and I have a loop that writes Curses.getch to a file

21:21 <jhass> yeah, won't work for a background program

21:21 <jhass> it won't receive stdin from your tty/pty, simple as that

21:21 <jhass> you could probably hack around by reading the pty device in /dev

21:21 <jhass> but here be dragons

21:24 <vikaton> jhass, same deal with STDIN.getc ?

21:24 <jhass> try to understand what I said and that question becomes obvious

21:29 <vikaton> hmm

21:30 <kulelu88> jhass taking no nonsense tonight. sys.stdin ftw!!!

21:30 <vikaton> jhass, is there a specific file?

21:31 <kulelu88> for input check /dev/tty

21:31 <vikaton> there are many of them

21:32 <vikaton> I also can't open them

21:32 <kulelu88> there should be an API for input somewhere

21:32 <kulelu88> vikaton: try stealing the python code for this.

21:33 <vikaton> wut python code

21:33 <jhass> vikaton: man ctermid

21:33 <kulelu88> Look at sys.stdin

21:37 <vikaton> kulelu88: https://docs.python.org/2/library/sys.html#sys.stdin ?

21:38 <kulelu88> yeah, that is what I use for input for a little script I wrote in python

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21:47 <vikaton> mh

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