#ruby on 2017-06-08 — irc logs at freenode.irclog.whitequark.org

2017-03-29 18:21 havenwood changed the topic of #ruby to: Rules & more: https://ruby-community.com || Ruby 2.4.1, 2.3.4 & 2.2.7: https://www.ruby-lang.org || Paste >3 lines of text to: https://gist.github.com || Rails questions? Ask in: #RubyOnRails || Logs: https://irclog.whitequark.org/ruby || Books: https://goo.gl/wpGhoQ

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00:04 <havenwood> >> students = {}; students.default_proc = -> h, k { h[k] = [] }; students['Class 1'] << 'Bob'; students # lucas__

00:04 <ruby[bot]> havenwood: I'm terribly sorry, I could not evaluate your code because of an error: NoMethodError:undefined method `[]' for nil:NilClass

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00:04 <havenwood> #=> {"Class 1"=>["Bob"]}

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00:04 <havenwood> lucas__: Another way to write that is:

00:04 <havenwood> >> students = Hash.new { |h, k| h[k] = [] }; students['Class 1'] << 'Bob'; students

00:04 <ruby[bot]> havenwood: I'm terribly sorry, I could not evaluate your code because of an error: NoMethodError:undefined method `[]' for nil:NilClass

00:05 <havenwood> #=> {"Class 1"=>["Bob"]}

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00:06 <acalycine> How do I replace capturing groups of a pattern in `sub`?

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00:07 <havenwood> acalycine: #sub doesn't care about capture groups

00:07 <havenwood> acalycine: show the code?

00:07 <havenwood> acalycine: or have an example input and desired output?

00:07 <acalycine> Sec.

00:07 <lucas__> havenwood: thanks!

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00:08 <havenwood> lucas__: no prob!

00:08 <acalycine> https://gist.github.com/06d1cafa36747dd9f5da5b3c73226901

00:09 <acalycine> Forget the `to_s`, it's only useful in my original code.

00:09 <havenwood> acalycine: require 'nokogiri'; Nokogiri::HTML(date).text #=> "2016-08-09T13:55:13+00:00"

00:09 <elomatreb> Can't you just sub /<.+>/?

00:10 <acalycine> Nokogiri, cool.

00:10 Kug3lis is now known as Kug3lis_off

00:10 <elomatreb> Oh, that'd be too greedy, nevermind

00:10 <acalycine> Just for future reference, is there a way to do this with pure Ruby/sub?

00:11 <acalycine> Also, is there a way to change in place with '!' or something?

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00:12 <havenwood> acalycine: Or with Oga: require 'oga'; Oga.parse_xml(date).css('updated').text

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00:12 <elomatreb> Not nearly as robust, but .gsub(/<.+?>/, "") seems to work

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00:14 <havenwood> >> "<updated>2016-08-09T13:55:13+00:00</updated>"[/(?<=<updated>).*(?=<\/updated)/]

00:14 <ruby[bot]> havenwood: # => "2016-08-09T13:55:13+00:00" (https://eval.in/813663)

00:14 <havenwood> acalycine: ^

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00:14 <acalycine> Ah, very cool.

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00:16 <havenwood> acalycine: Or a silly one: date.chomp('</updated>').reverse.chomp('<updated>'.reverse).reverse

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00:17 <acalycine> I love it. You can do so many things in so many ways.

00:17 <havenwood> >> "<updated>2016-08-09T13:55:13+00:00</updated>".chomp('</updated>').reverse.chomp('<updated>'.reverse).reverse

00:17 <havenwood> #=> "2016-08-09T13:55:13+00:00"

00:17 <ruby[bot]> havenwood: # => "2016-08-09T13:55:13+00:00" (https://eval.in/813664)

00:17 <acalycine> Say I have `Time.parse(date).to_f`. How can I change that variable in place?

00:18 <acalycine> Usually I'd put a `!` but not sure where to put it.

00:19 <havenwood> acalycine: Use `Time.iso8601(date)` if it's iso8601.

00:19 <havenwood> acalycine: Why a float?

00:20 <havenwood> >> Time.iso8601("2016-08-09T13:55:13+00:00").to_f

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00:20 <acalycine> I'm using it later on in my code, but haven't figured out the details of tha tyet.

00:20 <ruby[bot]> havenwood: I'm terribly sorry, I could not evaluate your code because of an error: NoMethodError:undefined method `[]' for nil:NilClass

00:20 <acalycine> *yet

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00:20 <havenwood> acalycine: A Rational or BigDecimal will give nanosecond precision, if you care.

00:20 <havenwood> I guess your input won't have that detail?

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00:21 <havenwood> Time.iso8601("2016-08-09T13:55:13+00:00").to_r #=> (1470750913/1)

00:21 <acalycine> probably not

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00:22 <havenwood> acalycine: unix_time_date_float = Time.iso8601(date).to_f

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00:23 <havenwood> acalycine: If it's not the same thing spare yourself headache and use a different variable. Or extract the conversion to a method and use that like: unix_time_float(date)

00:23 <acalycine> Ah.

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00:35 <acalycine> Do you know of a Nokogiri way to parse just the href from `<link href="google.com"/>` and the title from `<title>Test!</title>`?

00:36 <acalycine> Nokogiri::HTML does not give me the result I want

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00:46 <acalycine> havenwood: ?

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00:52 <havenwood> acalycine: css('title').text

00:53 <havenwood> acalycine: css('link').map { |link| link['href'] }

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00:54 <havenwood> acalycine: require 'nokogiri'; Nokogiri::HTML('<title>Test!</title><link href="google.com"/>').css('title').text #=> "Test!"

00:54 <havenwood> acalycine: You can use css selectors or xpath with nokogiri or oga.

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00:55 <acalycine> What would the `css` be in tis case?

00:55 <acalycine> In ur first example

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00:55 <havenwood> acalycine: That's a css selector.

00:55 <acalycine> How do I refer to the document in that example, though?

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00:56 <havenwood> acalycine: With XPath and not just title but a title in a head in html for example: require 'nokogiri'; Nokogiri::HTML('<html><head><title>very specific</title></head></html>').xpath('/html/head/title').text

00:56 <havenwood> #=> "very specific"

00:56 <havenwood> acalycine: I don't think I understand the question.

00:57 <acalycine> nevermind, that last one should work

00:57 <acalycine> Thanks

00:57 <havenwood> acalycine: You can use .css or .xpath for a css selector or xpath. No prob.

00:58 <acalycine> Will that last example work for the link as well?

00:58 <acalycine> Since the href is inside the node

00:58 <havenwood> acalycine: require 'nokogiri'; Nokogiri::HTML('<link href="google.com"/><link href="ruby-lang.org"').css('link[href]').map { |link| link['href'] } #=> ["google.com", "ruby-lang.org"]

00:58 <acalycine> Ah, cool.

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00:59 <havenwood> acalycine: You can do any of these with #css or #xpath, your choice.

00:59 <havenwood> The #css are usually a bit less gross.

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00:59 <havenwood> depends

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01:02 <havenwood> acalycine: You can use #at_css when you know there's only one: Nokogiri::HTML('<title>example<title>').at_css('title').text

01:03 <acalycine> Interesting.

01:04 <havenwood> acalycine: So if you wanted just one link: Nokogiri::HTML('<link href="google.com"/><link href="ruby-lang.org"').at_css('link')['href']

01:04 <havenwood> #=> "google.com"

01:04 <havenwood> (ignoring the second "ruby-lang.org" link)

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01:11 <wtc> hi all, looking for full coverage of xls and xlsx including formula updates

01:12 <wtc> aside from rubyXL and spreadsheet, where look?

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01:28 <acalycine> If I'm a couple blocks deep, do I need to `return` a value just once, or multiple times?

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03:13 <wtc> acalycine: probably once each, brosef

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03:31 <empty_cup> i've been looking online and found a couple of examples of mocking single methods using rspec-mocks. is there a similar ability in minitest that ships with ruby?

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03:51 <havenwood> ah, empty_cup left? too bad.

03:51 <havenwood> https://gist.github.com/havenwood/84207afa092ce5d5a680

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05:38 <acalycine> How do I select the hash from an array containing a string and a hash?

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05:39 <elomatreb> acalycine: Try #grep(Hash)

05:40 <acalycine> Enumerable?

05:40 <elomatreb> It's from Enumerable, yeah

05:40 <acalycine> cool.

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05:40 <elomatreb> It's basically a select with ===, which for classes (like Hash) is an instance check

05:40 <elomatreb> Very useful

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05:49 <mistnim> what is an easy way to save some small information accross a program restart?

05:51 <synstack> read/write to a text file?

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05:53 <acalycine> What exactly does `:in `each': no block given (LocalJumpError)` mean?

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05:54 <apeiros> acalycine: it means that it happened in the method "each" and that you didn't give it a block, while it expected one (tried to yield to the block)

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05:54 <mistnim> synstack: something like YAML.dump, but I don't like yaml very much

05:54 <synstack> json?

05:55 <acalycine> Weird. This is the line that it's happening on. `id = (array.grep(Hash).reduce[:link]).match(/comments\/(.*?)\//)[1]`

05:55 <acalycine> There's no each happening.

05:55 <mistnim> synstack: but there is no JSON.dump

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05:55 <mistnim> ops there is

05:55 <synstack> :)

05:55 <apeiros> acalycine: you probably see a "reduce" in your backtrace too

05:56 <acalycine> Ah.

05:56 <acalycine> So that method uses `reduce`?

05:56 <acalycine> What does it have to do with each, i.e.

05:56 <apeiros> other way round

05:56 <acalycine> Ah.

05:56 <apeiros> reduce uses each

05:56 <apeiros> sometimes methods are made of other methods ;-)

05:57 <apeiros> the way to read a backtrace: keep scanning until you find a line which happens in *your* code (identifiable by the file)

05:57 <apeiros> work your way from there

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05:58 <acalycine> Huh. I run that line in IRB and it works perfectly. But it doesn't work in my script.

05:58 <acalycine> Perhaps it's 'up-stream'

05:59 <apeiros> I quite doubt that reduce[:link] works

05:59 <apeiros> but it's early in the morning so maybe I'm missing something

05:59 <acalycine> Found it.

05:59 <acalycine> Yeah, I fixed that line as well.

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06:14 <Cork> anyone here have an idea why ruby depends on jquery in debian?

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06:15 <herwin> iirc it installed documents that are partially generated via javascript/jquery

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06:15 <Cork> ah

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06:36 <arup_r> Is there any direct way to get the filename of a tempfile. I tried:

06:36 <arup_r> >> file = Tempfile.new(['hello', '.jpg']); puts File.basname(file.path)

06:36 <ruby[bot]> arup_r: # => uninitialized constant Tempfile (NameError) ...check link for more (https://eval.in/813834)

06:37 <arup_r> >> require 'tempfile; file = Tempfile.new(['hello', '.jpg']); puts File.basname(file.path)

06:37 <ruby[bot]> arup_r: # => /tmp/execpad-3666fba4a996/source-3666fba4a996:2: syntax error, unexpected tIDENTIFIER, expecting key ...check link for more (https://eval.in/813835)

06:37 <herwin> Tempfile#path

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06:37 <arup_r> path gives the full path. I want the name..

06:38 <arup_r> >> require 'tempfile'; file = Tempfile.new(['hello', '.jpg']); puts File.basname(file.path)

06:38 <ruby[bot]> arup_r: I'm terribly sorry, I could not evaluate your code because of an error: NoMethodError:undefined method `[]' for nil:NilClass

06:38 <arup_r> I have so many typos :(

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06:47 <plshalprubygods> hallo anyone up ?

06:47 <baweaver> ?ask

06:47 <ruby[bot]> Don't ask to ask. Just ask your question, and if anybody can help, they will likely try to do so.

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07:13 <mistnim> is there a consistent way, know its class, to recreate an object from it's JSON.dump string

07:14 <mistnim> class.new is not good, because numbers don't have new method

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07:14 <herwin> would using yaml instead of json work?

07:15 <mistnim> herwin: no, the string they generates for the single object are more or less the same

07:15 <mistnim> if not exactly the same

07:15 <mistnim> let me try

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07:17 <zenspider> mistnim: not using json to serialize objects is a better start

07:17 <mistnim> zenspider: what should I use?

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07:18 <plshalprubygods> https://gist.github.com/anonymous/42dedd309623520f561917ac2ea6778e

07:18 <zenspider> marshal if you are only using this across ruby. yaml otherwise

07:18 <zenspider> plshalprubygods: ignoring the errors and awkward syntax... that's ruby!

07:18 <plshalprubygods> I get the following error /usr/lib/ruby/1.8/net/http.rb:560:in `initialize': can't convert Hash into String (TypeError)

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07:19 <mistnim> zenspider: ok but I have the same problem with yaml, It won't generate back the object often, but its string represantation

07:19 <zenspider> 1.8...

07:19 <mistnim> so I need a consisten way to get the object back

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07:19 <zenspider> mistnim: are you interacting with other systems/languages?

07:20 <mistnim> zenspider: I might possibly

07:20 <mistnim> but just on read on the other end

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07:20 <zenspider> I don't care about "might"s... I don't work with what-ifs

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07:20 <zenspider> I work with right-nows

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07:20 <mistnim> it's very likely that I will in the future

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07:21 <zenspider> >> require "yaml"; X=Struct.new(:x); X.new([1, 2, 3]).to_yaml

07:21 <ruby[bot]> zenspider: # => "--- !ruby/struct:X\nx:\n- 1\n- 2\n- 3\n" (https://eval.in/813848)

07:21 <morfin> i was looking where File.open is located - maybe if i debug ruby itself i understand what's wrong with path resolving

07:22 <zenspider> I haven't seen any problems with yaml ... you're gonna have to provide an example of the problems you're having

07:22 <zenspider> morfin: probably nothing is wrong with path resolving...

07:22 <zenspider> and by probably, I mean 99.99% chance there is no problem

07:22 <zenspider> what's going on?

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07:26 <mistnim> zenspider: I save a Time object to yaml, I load it and it's just a string not a Time Object

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07:27 <mistnim> >>> require "yaml"; YAML.load(YAML.dump(Time.now))

07:27 <mistnim> >> require "yaml"; YAML.load(YAML.dump(Time.now))

07:27 <ruby[bot]> mistnim: # => 2017-06-08 07:27:26 +0000 (https://eval.in/813850)

07:27 <mistnim> >> require "yaml"; YAML.load(YAML.dump(Time.now)).class

07:27 <ruby[bot]> mistnim: # => Time (https://eval.in/813851)

07:28 <plshalprubygods> zenspider: Do you know why it errors out ?

07:28 <mistnim> interesting

07:28 <plshalprubygods> on this line 'response = Net::HTTP.start( uri.host, uri.port, :use_ssl => true, :verify_mode => OpenSSL::SSL::VERIFY_NONE) {|http|'

07:28 <herwin> mistnim: maybe use something newer than ruby 1.8

07:28 <herwin> and all will be fine

07:29 <zenspider> mistnim: heh... maybe it's ok?

07:30 <zenspider> herwin: eh. nah. that should work fine in 1.8 iirc

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07:30 <mistnim> yeah, sorry, I was sure it didn't work last time I tried

07:30 <zenspider> I'd need to look at the old rdoc tho, and I don't care that much

07:30 <zenspider> plshalprubygods: you're using a beyond unsupported version of ruby. You're gonna have to consult your docs. `ri Net::HTTP.start` and look at the args

07:31 <zenspider> mistnim: no worries. I DO expect to get a string back from json tho

07:31 <plshalprubygods> I cant... ruby 1.8.7 (2013-06-27 patchlevel 374) [x86_64-linux]

07:31 <zenspider> plshalprubygods: if you can't be bothered to read your own docs, nobody can help you

07:31 <plshalprubygods> Ive gone through the 1.8.7 docs they are of no use

07:32 <zenspider> clearly that's not the case. I used them to good success.

07:32 <zenspider> even with Net::HTTP

07:34 <zenspider> ok. for fun, I did look it up... you clearly didn't.

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07:35 <zenspider> def HTTP.start(address, port = nil, p_addr = nil, p_port = nil, p_user = nil, p_pass = nil, &block)

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07:51 <Neptu> hello a variable like this is special @@ssh_ip@@??

07:52 <ljarvis> Neptu: that is not a valid variable name

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07:52 <ljarvis> perhaps you mean without the trailing @@

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07:52 <ljarvis> in which case, it's a class variable

07:53 <ljarvis> http://www.zenspider.com/ruby/quickref.html#variables

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08:15 <Neptu> ljarvis: im trying to get a hold of an undocumented variable on the vagrant project and I wonder if its possible to dump all all variables in the executed program to try to find the one im looking for...

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08:19 <zenspider> Neptu: "dump"?

08:19 <zenspider> Do you just want to grep for your thing?

08:20 <zenspider> grep -r @@ssh_ip.+= lib

08:20 <Neptu> zenspider: yes i want to grep for my thing

08:20 <Neptu> zenspider: ok long story

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08:21 <Neptu> im using the openstack pluging for vagrant and I want to get the the ip from the plugin but i donno what is the variable holding it

08:21 <Neptu> that is why i want to find a way to dump all variables and trace back where they store this on a fast way

08:22 <Neptu> https://github.com/ggiamarchi/vagrant-openstack-provider/blob/4a252918e7ebbed0db5562dd8f671bccadde586e/source/lib/vagrant-openstack-provider/action/provision.rb

08:22 <Neptu> my ruby is not strong enough to understand what they are doing im trying to learn by doing

08:23 <zenspider> https://github.com/ggiamarchi/vagrant-openstack-provider/blob/4a252918e7ebbed0db5562dd8f671bccadde586e/source/lib/vagrant-openstack-provider/action/provision.rb#L49

08:23 <zenspider> seems like any logic is gonna be coming from that line

08:24 <zenspider> https://github.com/ggiamarchi/vagrant-openstack-provider/blob/b424746268e8b239befe473c85e7ae0a364f9760/source/lib/vagrant-openstack-provider/action/read_ssh_info.rb#L70

08:24 <Neptu> zenspider: i agree

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08:24 <Neptu> but the @env variable should have what i need

08:27 <Neptu> but donno if env is a global variable i can access outside the pluggin

08:27 <Neptu> as far as i read should be $env not @env

08:27 <zenspider> what are you trying to get ahold of, and why?

08:27 <Neptu> im trying to get a hold on the ip allocated by openstack

08:27 <zenspider> it is neither... it is just `env`... it is whatever is passed in

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08:28 <zenspider> seems like it'd be connected to: @utils.get_ip_address(env)

08:28 <Neptu> and im trying to use the ip because im building a cluster of things and I need to know the ips forhand before executing the ansible script

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08:30 <Neptu> but all does objects are not available from the vagrant side of things only inside the pluggin

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08:31 <zenspider> https://github.com/ggiamarchi/vagrant-openstack-provider/blob/master/source/spec/vagrant-openstack-provider/utils_spec.rb#L52

08:31 <zenspider> that might be a better hint

08:31 <zenspider> well... yeah. if they don't want to give you access to something... you either need to find a different way, or a way to cheat

08:31 <zenspider> luckily in ruby cheating isn't that hard

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08:32 <Neptu> zenspider: attr_accessor :floating_ip

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08:32 <Neptu> what this attr_accessor means?

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08:33 <zenspider> generates a reader and writer method for an ivar

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08:34 <zenspider> not sure... that util spec or nova_spec.rb is probably where you want to look for clues

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08:34 <Neptu> zenspider: mmmm https://github.com/ggiamarchi/vagrant-openstack-provider/blob/b424746268e8b239befe473c85e7ae0a364f9760/source/lib/vagrant-openstack-provider/config.rb

08:34 <Neptu> maybe that will be declared externally there

08:35 <Neptu> feels like a good point to start

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08:35 <morfin> i know hack which can help with Ruby and Msys2 but that'

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08:36 <morfin> that's some crap

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08:36 <zenspider> Neptu: sure. good luck

08:36 <morfin> subst to create new drive with root D:\msys2 and then build/install

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08:36 <morfin> so /home/myuser/.rbenv == G:\home\myuser\.rbenv

08:37 <zenspider> 75 minutes later and you're still not making sense

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08:37 <Neptu> zenspider: one last question what @variable mean?

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08:37 <Neptu> the @

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08:37 <zenspider> Neptu: that's an instance variable

08:37 <zenspider> check that URL you were sent before

08:38 <acalycine> @ = atts

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08:38 <morfin> zenspider, me?

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08:38 <zenspider> Neptu: http://www.zenspider.com/ruby/quickref.html#variables

08:38 <zenspider> acalycine: hrm?

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08:38 <Terens> hello

08:38 <Terens> when developing a gem

08:39 <Terens> lets call it ape

08:39 <Terens> in bin/gorilla file should I use require 'bundler/setup' or not ?

08:40 <zenspider> Terens: independent gems should not be using bundler at all... use it for development, sure... but your code shouldn't touch it

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08:41 <morfin> gems are isolated

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08:42 <Terens> so the correct is to declare dependencies in gemspec and require them ?

08:43 <Terens> and in development call my gem with bundle exec?

08:44 <zenspider> declare dependencies in gemspec. require any files you need where you need them. if you need bundle exec to run your stuff, you're probably doing it wrong

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08:44 <zenspider> `ruby -Ilib bin_or_test/blah` or `rake test` should be 99% of what you need

08:45 <acalycine> is there a better way to handle dependency installs? as in, doing `bundle install` and being able to run your script with just `ruby ruby.rb`.

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08:46 <zenspider> yes, that should work fine

08:46 <zenspider> if it doesn't, then you're probably not requiring things you need

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08:58 <Terens> zenspider if I have a dependecny 'event-machine' for example

08:59 <Terens> then shouldn't I require it somewher ein my code?

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09:02 <Terens> zenspider also how could i require development dependencies ?

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09:13 <herwin> I don't really understand that question: if you want to require development dependencies in the executable, wouldn't that make them runtime dependencies?

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09:18 <dminuoso> herwin: Then they are not development dependencies.

09:18 <dminuoso> herwin: A development dependency might `byebug' for example. Or maybe some mock adapter.

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09:19 <dminuoso> Or maybe some gem that helps with generating some static assets that are bundled into the final gem.

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09:25 <zenspider> development dependencies are probably going to be required in your rakefile or wherever you "development process" happens. that might be in your tests, rakefile, "build script"... I dunno.

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09:41 <Neptu> #<Object:0x00000002ed3dc8> how i can dump the contect of this object?

09:43 <tobiasvl> Neptu: normally #inspect — but you won't get any more information about an Object, it doesn't really have any content

09:43 <tobiasvl> what kind of content do you expect it to have?

09:44 <tobiasvl> https://ruby-doc.org/core-2.4.1/Object.html#method-i-inspect

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09:46 <Neptu> tobiasvl: thanks

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09:48 <zenspider> Neptu: try `require "pp"; pp that_obj`

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09:50 <Neptu> zenspider: managed to get an object using the variable floating_ip but donno what it is or contains... strange world... and it takes about 4 min to make another test so long story...

09:51 <Neptu> variable1=#<Object:0x00000001c090f8>

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09:51 <Neptu> "grafana:vars" => {"variable1" => "#{cc.floating_ip.inspect}"}

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09:54 <zenspider> Neptu: hope it is worth the effort. sounds like a pain.

09:54 * zenspider goes to bed

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09:55 <Neptu> zenspider: it is a pain...

09:55 <Neptu> zenspider: night...

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10:50 <Neptu> UNSET_VALUE is same as assign an empty object?

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10:51 <tobiasvl> huh?

10:52 <tobiasvl> it's a constant

10:52 <tobiasvl> seems to be a vagrant thing by googling. never heard of it

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11:03 <apeiros> Neptu: ruby doesn't have a concept of "empty object". do you mean nil? Object.new? {} (an empty hash)? something else?

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11:04 <apeiros> and as tobiasvl said, UNSET_VALUE would be a constant. constants are a kind of variables. variables and objects are different concepts. variables reference objects. they aren't objects themselves.

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11:21 <Neptu> apeiros: just checking that is exactly this UNSET_VALUE

11:22 <Neptu> ls -la

11:23 <apeiros> ?

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11:23 <apeiros> "that"? "this UNSET_VALUE"? contextual information is completely lacking…

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11:28 <tobiasvl> Neptu: perhaps you want to join #vagrant

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11:28 <tobiasvl> UNSET_VALUE seems to be a vagrant constant that's used to differentiate variables that are unset on purpose vs those that happen to be nil

11:28 <tobiasvl> or something

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11:35 <Neptu> tobiasvl: #unfortunately vagrant channel is dead

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11:40 <dminuoso> Neptu: They have a google group, an issue tracker on github..

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11:42 <Neptu> dminuoso: already on it... but slow Im trying to solve this problem myself

11:42 <Neptu> and learn ruby on the process

11:44 <Neptu> attr_accessor :floating_ip

11:44 <Neptu> this : what means?

11:45 <tobiasvl> a symbol

11:46 <tobiasvl> https://ruby-doc.org/core-2.2.0/Symbol.html

11:46 <tobiasvl> is #vagrant really dead? there are 320 people there

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11:50 <Neptu> tobiasvl: been for a couple of days only me speaking... strange is a good project but really irc is dead

11:50 <tobiasvl> too bad

11:50 <Neptu> tobiasvl: yes too bad :(

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11:58 <dminuoso> docker-compose build --no-cache

11:58 * dminuoso kicks back

11:59 <dminuoso> https://xkcd.com/303/ I need a tshirt with this/

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12:46 <De_Moivre> hello I am installing vagrant host-updater addon on Arch linux and I get this ruby error : https://paste.zkl.dk/siqovetehu.sql what does this signify?

12:47 <tobiasvl> De_Moivre: seems like the error message is cut off horizontally, so no idea

12:47 <tobiasvl> /opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/source.rb:192:in `load': Marshal.load r

12:48 <morfin> ruby has specific version of File for Windows i guess?

12:48 <morfin> win32/file.c and win32/file.h

12:48 <De_Moivre> how can I bypass this?

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12:48 <tobiasvl> morfin: what do you mean? .h is the C header file, .c is the implementation

12:49 <De_Moivre> dont use win32 :~0

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12:49 <De_Moivre> tobiasvl: how do you mean cut off horizontally?

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12:49 <simon__> any good practices in ruby?

12:50 <morfin> i know what they are

12:50 <morfin> De_Moivre, i almost made it work

12:50 <De_Moivre> the plugin?

12:50 <De_Moivre> morfin:

12:50 <morfin> i just need to understand what's wrong with Ruby File class

12:51 <De_Moivre> how can I give you that info?

12:51 <De_Moivre> I have never used ruby and cant learn it now ;P

12:51 <De_Moivre> too busy...

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12:52 <pupsicle> simon__: yes

12:53 <tobiasvl> De_Moivre: I mean that I don't see the whole lines in your paste

12:53 <tobiasvl> they stop abruptly

12:53 <De_Moivre> thats all that my term outputs

12:53 <De_Moivre> they gave out more

12:53 <De_Moivre> will paste it in a sec

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12:55 <tobiasvl> are you sure your terminal wraps lines

12:55 <De_Moivre> https://paste.zkl.dk/ayerugebov.hs

12:55 <De_Moivre> here you go

12:55 <De_Moivre> every so second attempt it outputs this

12:55 <tobiasvl> hm, that backtrace is missing the actual exception though

12:55 <tobiasvl> segfault, weird

12:56 <tobiasvl> I think it'd be better to ask a vagrant support channel

12:56 <De_Moivre> ok

12:56 <De_Moivre> I will make an issue on the git-hub aswell

12:56 <De_Moivre> is there an packages I may be missing?

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13:11 <symm-> hi, is there a version of Array::delete that returns the remaining array?

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13:11 <apeiros> symm-: don't think so. you can use #tap.

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13:11 <herwin> [:a, :b] - [:a] does kind of what you're looking for

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13:12 <symm-> oh that looks good herwin

13:12 <symm-> is #tap an Array function? can't find it listed

13:13 <ineb> Object#tap

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13:16 <symm-> ah that's actually lovely

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13:19 <centrx> symm-: Could also use keep_if with the opposite of your delete condition

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13:20 <symm-> I see, I just went with delete_if for now to keep it chainable

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13:20 <centrx> oh theer is a delete_if!

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13:26 <apeiros> symm-, herwin: beware, Array#- is a set operation

13:26 <apeiros> >> [1,2,2,3,2,4,5,2] - [2]

13:26 <ruby[bot]> apeiros: # => [1, 3, 4, 5] (https://eval.in/814033)

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13:26 <symm-> yes, I want to remove all instances of 2

13:27 <symm-> >>[5,4,3,2,2,2]-[2]

13:27 <ruby[bot]> symm-: # => [5, 4, 3] (https://eval.in/814034)

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13:27 <symm-> seems to preserve order

13:27 <apeiros> ok, then last beware: Array#- being a set operation uses eql?, delete uses ==

13:27 <apeiros> (well, hash+eql?)

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13:42 <Cork> is it possible to customize what gets printed in the console when one run > TheClass.new (or a variable of the instance)?

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13:44 <ljarvis> Cork: override the inspect method

13:45 <Cork> so class TheClass; def inspect ?

13:45 <ljarvis> correct

13:45 <Cork> sweet thx

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14:53 <guardian> hello, is the following idiomatic enough please?

14:53 <guardian> params[:class] = params[:class].nil? ? 'active' : (params[:class].split(' ') << 'active').uniq.join(' ')

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14:55 <leah2> params[:class] = (params[:class].to_s.split | ["active"]).join(' ') perhaps?

14:56 <guardian> looks good

14:56 <leah2> or params[:class] || ""

14:56 <matthewd> It means something quite different though

14:56 <leah2> if you think .to_s is to agressive

14:57 <leah2> matthewd: sure?

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14:58 <jhass> so this is CSS classes I guess? I'd abuse that it doesn't care about the trailing space: "active #{params[:class]}"

14:59 <matthewd> leah2: Ah sorry, yeah, misread the first one

14:59 <jhass> if the trailing space is so terrible to you: ["active", *params[:class]].uniq.join(" ")

15:00 <guardian> what's *params?

15:01 <jhass> splat

15:01 <jhass> >> [*nil]

15:01 <ruby[bot]> jhass: # => [] (https://eval.in/814100)

15:01 <jhass> >> [*"foo"]

15:01 <ruby[bot]> jhass: # => ["foo"] (https://eval.in/814101)

15:03 <guardian> thanks, I learnt something new

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15:16 <morfin> miniruby use same sources as ruby?

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16:08 <Norno> How would you write `first.second.map { |a| a + 1 }` to avoid rubocop's "Parenthesize the param to make sure that the block will be associated with the method call" error?

16:09 <Norno> oh wait, it was because I was using puts without parenthesis

16:10 <baweaver> what's the actual code?

16:10 <baweaver> because it shouldn't care about that

16:11 <Norno> `puts first.second.map { |a| a + 1 }`

16:11 <baweaver> ah, then that might, though you may just move the map up and assign it to a var

16:12 <apeiros> Norno: that's about puts' params

16:12 <apeiros> puts(foo { … })

16:12 <apeiros> or as baweaver said - assign it to a var before printing

16:12 <Norno> yep, I realized. That's what I meant with "oh wait, it was because I was using puts without parenthesis"

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16:13 <Norno> thanks though

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17:40 <ivanskie> hi all

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17:43 <ivanskie> so i wrote some code that downloads some stuff from industrial devices. i used yaml for config file, and csv for list of devices, names, and their ip addresses. originally thought would only be used at one site.

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17:45 <ivanskie> now realized can use it at another site. but since its being run from windows2008 server using travelingruby.. i don't know if i want to duplicate the code, and files for the other site. or make this more complex and promt for which site at runtime to check diff config file or info.

17:45 <ivanskie> kind of thinking about using sinatra to manage the config file, list of devices, and provide friendly front end to run the code and then get resulting data back.

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17:47 <ivanskie> And the question is two pronged to "y'all" is, should i just make a copy of the whole thing, and tell the ppl who'll be using it to use one for one site and use another for another. or show off my skills and extend the functionality.

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17:48 <dionysus69> I started reading my birthday present! well grounded rubyist! 2nd edition :)

17:48 <ivanskie> and if i extend the functionality to using sintra, what would be the best way (easiset/simplest) to work with the data. site:{device_credentials,uids,url,devices:[device_name, ip]}

17:48 <ivanskie> great book!

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17:49 <ivanskie> currently im using config yaml file for credentials, uids[], and csv for devices(device_name,ip,url).

17:50 <ivanskie> considering going the json route. kind of wish using active_model wasn't an overkill for a small program here.

17:50 <ivanskie> looking for suggestions :)

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17:52 <ivanskie> guess could bake my own nano thing.

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18:01 <mackesque> list

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18:10 <baweaver> mackesque: looking for something?

18:11 <mackesque> baweaver: a cure for fat fingers? :)

18:12 <baweaver> heh, fair enough

18:12 <baweaver> was thinking you might be after: /cs access #channel list

18:12 <baweaver> or something

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18:19 <c_nick> I need to parse a yml ,csv and xml file, is there a generic parser kind that parses all or do i need to parse these separately -> yaml parser, csv parser and xml parser

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18:19 <pupsicle> require 'universal_parser'

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18:29 <c_nick> pupsicle, wow this is fantastic! i dont need to code, everything is taken care of!

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18:31 <SeepingN> puts needful.do; end

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18:33 <pupsicle> lol

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19:14 <prubini87> Hi! Does anyone know how I can write a (simple?) command-line program that actively reads data from a socket (or anything else that streams constantly) and also actively listens to user input, that is, keeps the command line open for input, allowing for the input of commands... (writing to the socket, basically)? My problem is with this logic of listening to both things, the socket stream and

19:14 <prubini87> the user input simultaneously.

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19:17 <apeiros> &ri IO.select prubini87

19:17 <`derpy> prubini87: http://ruby-doc.org/core-2.4.1/IO.html#method-c-select

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19:20 <prubini87> @apeiros, @`derpy, thank you! I'll take a look at that! ;D

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19:20 <apeiros> prubini87: `derpy is a bot ;-)

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19:37 <chmuri> hi

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19:38 <jhass> hi

19:40 <baweaver> hi

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19:49 <SeepingN> lo

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19:52 <ivanskie> hi

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19:52 <ivanskie> is there something similar to active_record but for non-rails apps?

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19:55 <jhass> sequel

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19:56 <ivanskie> I have a predefined class Config. I want to have a folder Sites with site1.rb..etc files each following the same format of Config class.

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19:57 <ivanskie> then have an array of Sites, each with its own instance of Config object.

19:57 <ivanskie> not sure what to put into the site.rb file

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19:59 <ivanskie> do i do "class Sitename" and "extends Config"? orrr

20:00 <ivanskie> i haven't done this kind of stuff outside of rails before. but i wrote a program which reads config.yml file, and csv file with device names and ip addresses. and this was for a single site.

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20:01 <ivanskie> now i have to do this for multiple sites. and i'm thinking about having config files in Sites folder, have the code read each file....

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20:02 <ivanskie> gah

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20:03 <ivanskie> and also trying to make it easier for whomever is going to use it.

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20:06 <ivanskie> would have been nice if i could combine csv and yaml into a single file. hmm. make my own .site filename with markers all lines before marker interpret with YAML, all lines after marker interpret with CSV. hah

20:06 <ivanskie> solves two problems

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20:06 <ivanskie> except can't open in excel

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20:07 <ivanskie> trying to stay dry

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20:27 <zenspider> ivanskie: you can use active_record on non-rails apps too.

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20:29 <zenspider> there are also libraries for reading excel spreadsheets, but I have no clue how good they are. I avoid stuff like that

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20:35 <ivanskie> I've worked with excel files in ruby before. it can be annoying, but does work.

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20:36 <ivanskie> i could in theory just have a site definition file as an excel file..... hm

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20:36 <ivanskie> that does solve the problem, but i'd have to rewrite most of my core code since its working in csv

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20:38 <ivanskie> i've landed on defining site config in .yml file. then instanciating a Config object for each of these. hmm

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21:24 <lucas__> can someone think of a native (C) gem that is (1) popular; (2) has no external deps; (3) is very fast to build? (it's for a tutorial)

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21:36 <matthewd> lucas__: kgio is a dep of unicorn

21:36 <lucas__> thanks, actually I've found ffi

21:36 <lucas__> which makes it easy to write a hello world app

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21:37 <matthewd> Ah yep, much better

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21:55 <darix> lucas__: fast blank

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22:05 <ivanskie> when I include a Class within a Module, does that Class then extends the module?

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22:06 <apeiros> ivanskie: you can't include a class

22:06 <ivanskie> hm

22:06 <apeiros> do you mean "nest a class within a module"? as in: "module Foo; class Bar; …"?

22:07 <ivanskie> i think so.

22:07 <apeiros> no. nesting does not affect class hierarchy.

22:07 <apeiros> all it affects is constant lookup (both, how constants within Bar are looked up, and how Bar is looked up, the absolute "path" being ::Foo::Bar)

22:08 <ivanskie> i should probably upload it to github

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22:09 <apeiros> I'm not around for too much longer, though (but there are probably others around)

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22:15 <apeiros> ivanskie: before I go, just to clear up your terminology:

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22:15 <apeiros> class Foo; extend SomeModule; end # extending in ruby, also works with any object: some_obj.extend SomeModule

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22:16 <apeiros> class Foo; include SomeModule; end # including in ruby, only works with classes and modules, though the way it works with modules is sleightly weird

22:16 <apeiros> class Foo < SomeClass; end # inheriting in ruby (NOT called extending, mind you!)

22:17 <apeiros> module Foo; class Bar; end; end # nesting in ruby, makes the class available as Foo::Bar, also works with classes as namespace: class Foo; class Bar; end; end

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22:17 <apeiros> extend/include both only accept modules as argument (extend/include are methods, Object#extend and Module#include)

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22:19 <ivanskie> https://gist.github.com/i5okie/fed889b444d2165e4770a598cdf4b7d4

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22:41 <ivanskie> so originally i just had one set of files config.yml, devices.csv and one app.rb file.. reading config, list of devices, downloading all files. now i have multiple sites to do this for, from the same code. so instead of just copying the folder with the app, i decided to make it more complicated and have a folder with site.yml and site.csv, and for code to read each and download for each site. https://gist.github.com/i5okie/fed889b444d

22:42 <ivanskie> but this is the most complex Ruby project i've worked on to date (outside of rails apps). i don't HAVE to do it, but i challenged myself.

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22:43 <ivanskie> and now trying to figure out how to execute.

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22:46 <ivanskie> so does this look right? https://gist.github.com/i5okie/fed889b444d2165e4770a598cdf4b7d4

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22:48 <Radar> https://gist.github.com/i5okie/fed889b444d2165e4770a598cdf4b7d4#file-app-rb-L15-L18

22:48 <Radar> What is this?

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22:49 <Radar> https://gist.github.com/i5okie/fed889b444d2165e4770a598cdf4b7d4#file-app-rb-L30-L35

22:49 <Radar> What are those?

22:49 <Radar> Is this psuedo-code?

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22:50 <Radar> https://gist.github.com/i5okie/fed889b444d2165e4770a598cdf4b7d4#file-purpose-L6

22:50 <Radar> Each device, or each site?

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23:09 <ivanskie> sorry didn't notice u were saying stuff

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23:09 <ivanskie> have to connect to each device.

23:10 <ivanskie> and uhm thats just high overview. not actual code.

23:10 <ivanskie> . represents methods and : variables

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23:11 <ivanskie> i was going to upload code to github but then started working on this, and if I upload now it won't make any sense to anyone

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23:17 <ivanskie> expanding the app to reading multiple site config files and csv files using modules and classes, is probably overkill. but i was considering making this a sinatra app or a Gem in the future.

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23:31 <ivanskie> this is the code that only reads single config and .csv file: https://github.com/i5okie/pxgMapFetcher that i'm trying to expand to multi-site.. etc

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