Topic for #ruby is now Ruby programming language || ruby-lang.org || RUBY SUMMER OF CODE! rubysoc.org/ || Paste >3 lines of text in http://pastie.org || Para a nossa audiencia em portugues http://ruby-br.org/
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<loocorez>
mztriz: Your indentation...
<mztriz>
loocorez, Oh wow I didn't even think about that. I'll take a look at it again. Thanks
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<loocorez>
It just makes it hard to read, and ruby's throwing warnings when I run it for me...
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<vyrus001>
yo, what's the fastest way to turn a bunch of '/n's in a string to actuall newline chars in ruby?
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<rramsden>
vyrus001: "/n".sub("/n", "\n")
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<rramsden>
vyrus001, opps you want gsub for global replace gsub("/n", "\n")
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<loocorez>
rramsden: Those are actual newlines, not just a backslash and an n?
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<loocorez>
Nevermind, you're right! I was doing something wrong somewhere theer.
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<rramsden>
you might of been using single quotes, in that case \n is not escaped
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<vyrus001>
rramsden: thnx, didnt know if there was a faser way to do it othe than sub
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<swarles>
is there a way to do something like pointers in C++ or references in perl?
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<Harzilein>
hi
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<Harzilein>
is there some way, maybe using a block/proc where in a long chain of calls i can return nil or the earlier object's [] method with an argument?
<Harzilein>
like with a nokogiri search:
<Harzilein>
Addressable::URI.parse(result.css("a:contains('Next')").first["href"]) here it would help if the last [] would only get used if i actually get a node
<ryanf>
rails has a .try() method that I think does what you want
<swarles>
is there a way to do something like pointers in C++ or references in perl?
<nlew>
scx: text.squeeze("\n")
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<scx>
nlew: thx
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<nlew>
swarles: Ruby is all references. What do you mean?
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<banisterfiend>
swarles: Yeah, kind of, using object_id and ObjectSpace._id2ref
<swarles>
nlew, reference the object to avoid necessarily creating two objects that hold the same value
<ryanf>
swarles: you know arguments are passed by reference right?
<banisterfiend>
swarles: ruby does that anyway, if you want a copy then you have to explictly call #dup
<ryanf>
well, by value where the value is a reference
<nlew>
swarles: Assignment creates a reference, not a copy. So what you want is the natural behavior unless you have a particular use case where that's not true.
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<nlew>
Without duping, the only way you're likely to get a copy is by using += (or its ilk)
<ryanf>
banisterfiend: what would be a use case for _id2ref? having trouble thinking of an example that can't be done just as easily with normal references
<ryanf>
I guess you could use it for a soft reference
<ryanf>
that's kind of cool
<ryanf>
anything else?
<ryanf>
by soft I mean weak
<nlew>
It looks like that's exactly how WeakRef is implemented, indeed.
<ryanf>
oh, I didn't know weakref existed.
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<nlew>
I didn't either until I just grepped for id2ref in the source heh
<nlew>
Looks like it's also used for drb, which is the other thing I was thinking of
<banisterfiend>
is github down for anyone else?
<ryanf>
looks like it's just a proxy that doesn't inhibit GC?
<ryanf>
ahh, interesting
<ryanf>
yep
<nlew>
where you want to do some sort of strange in-memory "serialization"
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<ryanf>
banisterfiend: scheduled maintenance
<banisterfiend>
ryanf: i used it for hacks a while ago, i dont remember the use cases anymore sorry
<nlew>
Other than that, it looks largely unused in the source
<nlew>
it reminds me of this thread, "Why does Ruby have callcc?" http://bit.ly/vr4AOq
<TheMoonMaster>
Github down. :P
<nlew>
"The official answer is "why not". I provide the features, you use them. matz."
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<scx_>
danheberden: i want to remove everything from <script to /script>
<scx_>
for example from: <script bla>bla blah<div></div></script>I want this<script bla>bla blah<div></div>
<scx_>
i want: "I want this"
<mksm>
scx_, nokogiri?
<davidcelis>
^
<mksm>
paper is the biggest threat to a desk's usable space
<mksm>
written papers are the worst
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<frewsxcv_>
i'm learning rails right now. when i do 'rails server' it thinks i want to create an application called server
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<ryanf>
frewsxcv_: you're using rails 2, 'rails server' is part of rails 3, use 'script/server', ask ror questions in #ror
<ryanf>
I had to include that last bit or someone might yell at me :)
<frewsxcv_>
oh, that explains why #rails is dead
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<davidcelis>
lol
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<pkondzior>
Hello, how to mock/stub Process::Status in ruby ?
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<pkondzior>
specially to test handling nil exit status
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<pkondzior>
rubyspec is using Process.fork { Process.exit!(status_code) }
<pkondzior>
but how to do this for nil value ?
<pkondzior>
like application is quiting without exit code
<pkondzior>
because of segmetation fault ie
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<matled>
pkondzior: there is no such thing as "no exit code". if you want to simulate a segmentation fault you could either set the exit code manually or kill a process with "SEGV"
<pkondzior>
matled: there is
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<pkondzior>
matled: if your process is going to segfault, you will have exitcode nil
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<pkondzior>
matled: or memory allocation problems, or whatever system related
<pkondzior>
matled: but we can argue here is it improtnat from ruby level to handle this or is it not
<pkondzior>
my question is, how to stub Process::Status
<pkondzior>
in tests
<pkondzior>
specially nil :)
<matled>
pkondzior: mh, I see. at least in my shell it has an exit code of 139. I'm not too sure how it looks at the system call level.
<pkondzior>
matled: well i'm using fork + exec
<matled>
but to mimic the way rubyspec does it you could do fork { exec "sleep 60" }; sleep 0.5; Process.kill("SEGV", pid)
<pkondzior>
and flex application isnide
<pkondzior>
and when application is segfaulting or doing some bad stuff
<pkondzior>
it's returning Process::Status with pid but without exitstatus
<pkondzior>
i mean, exitstatus = nil in this case
<pkondzior>
to mimic all exitcodes using standard api i can just do fork { exit!(status_code); exit_status = Process.waitpid2
<pkondzior>
but exit!() accepts only 0-255 :)
<burgestrand>
Stub it out
<pkondzior>
burgestrand: I'm doing this right now but it's a bit awkward, do you have any suggestions ?
<pkondzior>
how to do this _well_ ?
<burgestrand>
pkondzior: I’ve never heard of anything not having an exit status; even if things segfault or run out of memory things tend to have an exit status for me
<burgestrand>
pkondzior: so, I have no idea
<burgestrand>
pkondzior: I would stub it out
<pkondzior>
burgestrand: well i can show you exitstatus.inspect :P
<burgestrand>
pkondzior: have your process #exited?
<pkondzior>
burgestrand: it's just crappy Adobe Air application
<pkondzior>
burgestrand: it's probably the reason, but i cannot fix this on that level
<burgestrand>
pkondzior: sorry, I must go in like… 1 minute :)
<burgestrand>
pkondzior: but yeah, I would stub it out, or actually make the child segfault
<burgestrand>
For the latter case you could create a C extension that tries to read something from a null pointer, and BAM
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<burgestrand>
And call that method in your test :)
<pkondzior>
burgestrand: yeah, but this is like bazooka :D
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<pkondzior>
burgestrand: for simple thing, anyway if my child is going to exit with SEGV :) it will return exitcode obviously becuase ruby is doing this correclty
<pkondzior>
i just have very nasty scenerio Ruby -> Fork -> Flex Application
<burgestrand>
Yeah, well stub or fake, it’s the only two viable options I see ^^
<burgestrand>
stub or bazooka ;)
<burgestrand>
Got to go now, have fun!
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<jonathan___>
Hello all, I'm new in Ruby and I would like to know what is the standard folders hierarchy used for the Ruby project ?
<jonathan___>
I come from Java and I was used to have Maven
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<kke>
no standard
<kke>
frameworks like rails have their "standards"
<jonathan___>
kke, ok I have seen Mr. Bones, and I've just started with it
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<jonathan___>
but how to write my code inside is still unclear
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<jonathan___>
I guess Bones is build by using Bones, I'll read the source code and find the answer I guess
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<apeiros_>
or Hash[(1..ary.length).zip(ary)]
<pen_>
apeiros_: oh that should work too, thanks
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<elliot98>
um...is there a rubygem or library that can parse mbox email files?
<apeiros_>
unaware of, but since mbox is - afaik - mostly the mail as it was received + delimitation, I'd use the mail gem to parse individual emails and handle the delimitation myself
<apeiros_>
@ elliot98
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<vagabond007>
sup
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<apeiros_>
vagabond007: it's good that you're interested in politics, but this is #ruby, not #politics.
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<eQuiNoX__>
hey guys, im new to ruby and im having to review some code real quick - hope someone can help me. I have instance declared as a cipher object(openssl, aes)
<eQuiNoX__>
and the code im doing does something like "cipher << l" where l is a line of input
<eQuiNoX__>
all the examples on the internet use something like "cipher.update(input)" and thats understandable
<eQuiNoX__>
i guess thats the right way to do it too
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<eQuiNoX__>
what exactly does the "cipher << l"(assuming l's a string) do?
<apeiros_>
eQuiNoX__: << is a method
<apeiros_>
what a method does depends on the receiver, not its arguments
<apeiros_>
so here it'd depend on what cipher is
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<apeiros_>
hm, openssl docs have been lacking in the past… let me see…
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<eQuiNoX__>
apeiros_: i did have a look around; its just that the "cipher.update" methods used usually to encrypt/decrypt from what i see
<eQuiNoX__>
apeiros_: thanks
<apeiros_>
hm, on ruby 1.9.3, there's no << method on cipher
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<tightwork>
Hello, How would one individual install Ruby Gems as a NON-root user? please and thank you in advanced.
<eQuiNoX__>
apeiros_ does it raise some kind of an exception if theres no method usually?
<apeiros_>
eQuiNoX__: yes
<apeiros_>
a NoMethodError
<eQuiNoX__>
hmm
<apeiros_>
but ruby allows you to add methods to existing classes & objects
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<apeiros_>
tightwork: that's the default if you installed ruby with rvm…
<eQuiNoX__>
apeiros_: hmm i just tried cipher << "test" on my irb and it shows me an empty string
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<apeiros_>
eQuiNoX__: do: cipher.method(:<<)
<apeiros_>
and paste the return value/output
<eQuiNoX__>
apeiros_: #<Method: String#<<>
<apeiros_>
cipher is *not* an OpenSSL::Cipher::Cipher then
<apeiros_>
it's a string
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<Na_Klar>
I heard TK was the "standard window toolkit" for ruby. Since TK is not really present anymore, is there now something you may call "standard" for ruby? Besides GTK or QT wxWidgets and so on of course ..
<deryldoucette>
FXRuby probably
<eQuiNoX__>
apeiros_: oh my bad, i had done cipher << "test" just before it
<shevy>
I think FXRuby is dead
<shevy>
and TK is ugly
<shevy>
I had hopes for wxwidgets but they seem to have slowed down
<shevy>
though... didn't banisterfiend hack something for pry similar to that?
<shevy>
or some workaround, I forgot
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<apeiros_>
shevy: not sure how well pry works with 1.8
<apeiros_>
eQuiNoX__: well, you can try provoking an exception in the method to get its backtrace
<apeiros_>
e.g. by doing: cipher << Object.new
<shevy>
apeiros_ pretty well!
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<eQuiNoX__>
apeiros_: hmm gets me a typeerror; ok so let me just clarify something. based on the type of the receiver, the action differs. so basically "<<" does different things for different actions of receivers. um am i right?
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<apeiros_>
eQuiNoX__: that was the point of it
<apeiros_>
that you get an error
<apeiros_>
along with the error, you get a backtrace
<apeiros_>
and in that backtrace, you can see where << is defined
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<eQuiNoX__>
apeiros_: outside irb?
<apeiros_>
eQuiNoX__: just paste the full exception you get on pastie.org
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<Creeture>
What's the de facto standard gem of the day?
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<Creeture>
Good grief. Question fail. The de facto *curl* gem? Most features / fewest bugs.
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<evilgeenius>
Is there an easy way I can allow the text "Gatwick Airp[ort DPE Servisair" to be used within a regular expression without an exception? This crashe : /Gatwick Airp[ort DPE Servisair/
<evilgeenius>
I was hoping i could do %r{Gatwick Airp[ort DPE Servisair} , but that stil causes an exception
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<Creeture>
evilgeenius: Should just be able to escape that [ and carry on.
<evilgeenius>
Creeture: is there a ruby technique that will do this for me?
<apeiros_>
Regexp.escape
<evilgeenius>
Creeture: the input text could be anything, not just "Gatwick Airp[ort DPE Servisair", so ideally id want a tec.....
<evilgeenius>
k
<Creeture>
Regexp.escape
<evilgeenius>
Cheers!
<Creeture>
apeiros_ is faster than me.
<evilgeenius>
we should hail him
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<andreim>
hey, I can't seem to get string.include? "this" or "that" or "bla" to owork
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<crankycoder>
anybody here using jruby on a daily basis? i've always had problems trying to use ruby-debug in jruby-1.6.4
<crankycoder>
the debugger always thinks there is only 1 stack frame
<crankycoder>
which is obviously not the case
<apeiros_>
andreim: that's not how it works
<andreim>
how should I go about doing that?
<apeiros_>
string.include? "this" or "that" or "bla" --> string.include?("this") or "that" or "bla"
<apeiros_>
that's how ruby understands what you're asking it to do
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<andreim>
oh I see
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<andreim>
then I shoul ddo string.include? "one" or string.include? "two" etc?
<andreim>
it gets repetitive
<andreim>
is there a way to test it for each values of an array for example?
<apeiros_>
you can also use string =~ /foo|bar|baz/
<andreim>
oh
<andreim>
indeed
<apeiros_>
or ['foo', 'bar', 'baz'].any? { |word| string.include?(word) }
<apeiros_>
there's surely a couple of other ways
<andreim>
whoa, interesting
<andreim>
thank you apeiros_
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<devdazed>
hi all, what is this syntax in ruby? ->(foo)
<Mon_Ouie>
It's another syntax for lambdas
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<devdazed>
Mon_Ouie: thanks
<Mon_Ouie>
-> (foo) { … } is the same as lambda { |foo| … }
<devdazed>
awesome, i appreciate it
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<lord1231>
hi
<lord1231>
how can i increment on a hash? for example h={};h["key"] += 5 #h["key"] now should = 5)
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<rippa>
h = Hash.new(0)
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<Mon_Ouie>
The only thing is that h["key"] in your example is nil, not 0
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<devdazed>
h[key] ||= 0; h[key] += 5
<Mon_Ouie>
Setting a default value (as in rippa's example) is cleaner
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<Mon_Ouie>
And you won't forget to set the value to 0 if you access it
<lord1231>
ok
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<keyword>
hey guy how can I split a big csv file into multiple smallers
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<lord1231>
keyword read a certain number of lines, into a new file, then increment the file name and such
<lord1231>
thats a logic, not a ruby question
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<shevy>
yeah rippa EXACTLY!
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<chilversc>
why would gem uninstall be telling me "ruby-debug-ide" is not installed when it shows up in gem list?
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<Tasser>
chilversc, buggy? reinstall and see if it happens again
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<scx>
i have 2 arrays
<scx>
one is really big
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<scx>
how to fast check if (B - A) != B; #A, B - my arrays
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<shevy>
scx what? what does that mean
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<scx>
shevy: i want to check that one or more element in array B is included in array A
<dpritchett>
Anyone around with experience hosting multiple sinatra apps via passenger on ubuntu?
<apeiros_>
scx, which one is really big?
<dpritchett>
I'm trying to get the sub uris ironed out and it's not worked yet
<shevy>
scx how abouty array1 & array2
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<scx>
apeiros_: A is really big
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<scx>
B is small
<apeiros_>
scx: now I've got a small problem, you gave two problem descriptions which are - as far as I understand them - different from each other
<apeiros_>
so you want true if any element in B is also in A?
<scx>
yes
<apeiros_>
scx: any reason you have them arrays and not e.g. Sets?
<incluye>
srid: Also, in your snippet, "ping" is trying to call ping, the class method of Foo, but you defined it as an instance method
<incluye>
"def self.ping" instead of "def ping" would define a class method
<srid>
heh. interesting. modules are like class, then?
<incluye>
modules are like classes, but you can't make instances of them
<incluye>
but you can mix them in to classes, and that is what they're mainly for
<incluye>
that, and namespacing
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<srid>
well, essentially i want to group a set of functions (for same functionality) into a single file/module. what is the best way to refer them from other files/modules? "include" and ping() or directly Foo::ping?
<incluye>
probably include
<srid>
maybe i should just learn ruby properly first
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<incluye>
If it's supposed to be a static method then Foo::ping should be okay
<incluye>
but if it's supposed to be an instance method of another class, include Foo
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<pangur>
In my main <div> of my view, I have <% if person.role == "Whatever" %>. Could I have a link in another div that would provide the various "Whatever"s?
<pangur>
In other words, I want people to be able to pick from either a menu the relevant role.
<pangur>
So that that the value of the role that they pick is passed to "Whatever"
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<pangur>
Is that a ruby question or an ajax one or something else?
<srid>
incluye: more clear, thanks. modules seem more like mixins, except they can *also* be used as namespace (using self.bark ... Dog.bark)
<pangur>
In the main <div> of my view, I have <% if person.role=="Whatever" %>. Could I have a link in my menu div that would supply Whatever with the missing variable?
<incluye>
modules *are* mixins
<srid>
for my case above, then, I imagine I should prefix all methods with `self.`
<incluye>
if you want to call them that
<pangur>
oops, sorry that was for sinatra
<srid>
remember, for my case above, all I wanted was to namespace the functions.
<incluye>
srid: If you want to make them all static methods, yes
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<incluye>
And you don't want to make a class for it, then sure
<incluye>
A better way to do it is thus
<srid>
right, no class. just a group of functions.
<incluye>
I mean, if you're defining more than one function
<incluye>
module Foo; class << self; defs here; end; end
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<srid>
ok, i think i've seen that trick somewhere. will use it.
<incluye>
right
<incluye>
I don't know why it works, I should probably figure that out
<shevy>
magic
<incluye>
oh, wait
<shevy>
whenever I notice something that works, where it should not, I attribute this to magic
<incluye>
class << foo defines methods for foo
<incluye>
that's standard syntax
<incluye>
in class context, self refers to the class, which is an instance of Class
<incluye>
oh Ruby ._.
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<tommylommykins>
I am running some code in a thread. It appears that when an exception occurs in that thread, the failure is entirely silent
<tommylommykins>
How can I 1) make my whole script die, and 2) make it output the error
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<apeiros_>
alternatively: Thread.new do begin …yourcode… rescue => e; somehow_handle(e); end; end
<tommylommykins>
is abort_on_Exception global? I jsut stick that at the top of my script? :D
<incluye>
yes
<tommylommykins>
aha, cheers :)
<apeiros_>
IMHO that should be the default :-/
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<tommylommykins>
mmm, any idea what the rationale behind letting threads silently die is?
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<apeiros_>
tommylommykins: no idea, which is why I think aborting on exception should be the default…
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<puff>
How hard would it be to set up something to run arbitary, untrusted ruby scripts in an isolated fashion?
<Creeture>
puff: Arbitrarily difficult.
<Creeture>
What sort of environment are you talking about? Something to build and test the scripts or just dorking around? Look into Jenkins if you're looking for Continuous Integration type of behavior.
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<puff>
Creeture: I'm looking into the idea of creating a site to facilitate collaboration between policy wonks and geeks, allowing the geeks to upload arbitrary ruby scripts that munge data from open data source.
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<puff>
@rn
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<shevy>
when I have a library called ...
<shevy>
foo ... and in its base dir ... I have lib/foo/ and lib/foo.rb
<shevy>
what does foo.rb need to include in order to call the other .rb files?
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<devdazed>
shevy: require './lib/foo'
<devdazed>
or you can optionally unshift the lib directory into your include path
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<explodes>
I am not a ruby developer. That being said. How do I install ftools?
<explodes>
I did "brew install ruby"
<explodes>
I have ruby 1.9.3p0
<shevy>
hmmm
<Creeture>
explodes: gem search -r ftools ; gem install <whatever that returns> maybe? Dunno what ftools is.
<explodes>
Its some missing decency when manually installing rake. I guess i can gem install rake and skip this search process
<explodes>
Thanks tho!
<explodes>
Though **
<Creeture>
Oh, it's a rails thing. I don't do rails.
<shevy>
I think I begin to understand
<shevy>
with this:
<shevy>
$:.unshift(File.dirname(__FILE__))
<shevy>
you append to $LOAD_PATH right?
<shevy>
and then you can just require files from there that reside in subdirectories?
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<apeiros_>
devdazed: ugh…
<apeiros_>
shevy: just `require 'foo'`
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<apeiros_>
if you're doing test-runs you can use -I (capital i) to add the lib dir to the load path
<apeiros_>
e.g. ruby -Ilib, or irb -Ilib
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<devdazed>
apeiros_: guess i misunderstood the question
<explodes>
OSX Lion: gem install terminitor && terminitor init >> `report_activate_error': Could not find RubyGem rake (>= 0.8.1)
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<explodes>
Where are gem executables installed by default?
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<explodes>
Maybe I need to add rake to PATH first
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<explodes>
Oh rake is on the path
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<explodes>
Ok, I give up on terminator. gem install consular
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<explodes>
consular init :: command 'consular' not found
<TandemAdam>
does anyone else hate that ruby doesn't have a good way to do multiline comments?
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<Creeture>
TandemAdam: Just as good as anything else. Use the rubydoc syntax of =begin =end
<Creeture>
or "if 0" a block
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<Creeture>
My bad…it's ruby. 'if nil'
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<Creeture>
0 is true.
<nemski>
:)
<TandemAdam>
Creeture: imho I think /* */ in other languages is a much more elegant way of doing it
<TandemAdam>
even <!-- --> is better than =begin -end
<nemski>
it's all about the flexible grammar
<nemski>
got to make sacrafices
<Creeture>
I think I disagree with you, but think that's as far as the argument should go. :) Never liked /* */ - it's awkward and pain in the nuts to match those characters in vi.
<tommylommykins>
/me does not like /* */
<nemski>
///*
* tommylommykins
always mixes round the / and the *
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<TandemAdam>
yeah, it's just disappointing that ruby doesn't have the MOST elegant solution for this
* tommylommykins
would prefer something different to =begin=end though
<TandemAdam>
tommylommykins: yeah for sure
<Creeture>
So if nil { } then. That's elegant.
<nemski>
TandemAdam: you can just use Here documents
<Creeture>
It's even block-match happy.
<nemski>
define your own deliminator
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<tommylommykins>
uhh
<Creeture>
I'll always love "#if 0" in C. That's the best one.
<tommylommykins>
but what about "if nil {end end end end end end end}"
<tommylommykins>
Does that not break the parser?
<Creeture>
Nah. It's smarter than that.
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<Creeture>
Well…maybe of course it does.
<tommylommykins>
irb(main):001:0> if nil {end end}
<tommylommykins>
SyntaxError: compile error
<tommylommykins>
(irb):1: syntax error, unexpected '{', expecting kTHEN or ':' or '\n' or ';'
<tommylommykins>
if nil {end end}
<Creeture>
Outsmarted by the language.
<levity_island>
when listing dependencies for a gem that uses Bundler: should i do it in the gemspec, Gemfile, or some combination of the two? what about e.g. dependencies only for running tests?
<tommylommykins>
not really a comment then?
<Creeture>
Nope. Just a runtime no-op.
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<Creeture>
With a compile error built in for fun.
<chilversc>
I just use an editor with multiline comment/uncomment support
<tommylommykins>
mmm, if the parser fails at recognising that I meant it to be a comment, then it's not acomment?
<Creeture>
Made it all the way to the end of the day without being wrong until now.
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<chilversc>
bonus is, you can comment a commented section and not get an error
<Creeture>
yeah - nested =begin =end doesn't work either. You could always just delete the code.
<Creeture>
That works every time.
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<maz3>
hi
<maz3>
i need some help with ruby
<incluye>
nowai
<maz3>
i have a variable which is choice = gets. I want to then do a case statement if the choice = a and another case statement if the choice = b
<maz3>
how do i do this?
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<maz3>
Usually with Java I do switch(choice)
<maz3>
then case 'a':
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<incluye>
case choice
<incluye>
when "a"
<incluye>
when "b"
<incluye>
etc.
<incluye>
also, ruby doesn't have "break" statements for case blocks
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<maz3>
but then in each case there already is a when
<maz3>
cause this program thane 2 inputs
<incluye>
what
<maz3>
let me show you the program in java, and what i've written in ruby ok?