ChanServ changed the topic of #crystal-lang to: The Crystal programming language | | Crystal 0.23.1 | Fund Crystal's development: | GH: | Docs: | API: | Gitter:
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<FromGitter> <marksiemers> > guys what you think will crystal dominate go or not ?)) ⏎ ⏎ Still TBD. I think Crystal will have to get a lot of adopters from Ruby, Python, and even Elixir. ⏎ Syntax and enjoyment of coding, I think Crystal is a hands down winner, but that is pretty subjective. ⏎ The major things holding it from wide adoption (IMO) are these: ... [
<FromGitter> ... l-lang/crystal?at=5a0e29fd982ea2653f8bd7e5]
<FromGitter> <marksiemers> In addition to those, in the data science world, it could displace python - but that's really outside my realm of knowledge.
<FromGitter> <sdzyba> not sure we would see 1.0 any time soon. ⏎ according to the graph on this page 2017 has the lowest development pace comparing to previous years:
<oprypin> the situation is even worse than that when you look at code added. commits from external contributors are usually tiny
<oprypin> also @asterite's graph is basically the same as the main one
<FromGitter> <marksiemers> @sdzyba - I agree that doesn't look like a promising trend, I would hope that means as the language matures, fewer changes are needed, and each of them take more time (to co-exist with the larger existing code-base), but I'm afraid it may be volunteer weariness - and it looks like for a while Ary was putting in a lot of commits.
<oprypin> but FWIW we did get more external contributors
<FromGitter> <marksiemers> High level what is considered mandatory for 1.0? Parallelism, Windows support, something else?
<FromGitter> <marksiemers> With the concurrency built in, I think parallelism could wait for a 2.0, but there may be a lot of important reasons for that feature that I'm not aware of.
<oprypin> marksiemers, it's needed for 1.0 not because it's "nice" but because libraries (standard library too) are not ready for it and would have to change their APIs likely
<oprypin> for the longest time I was of the opinion that having a breaking 2.0 release soon after 1.0 could be devastatingly disappointing to a lot of people
<oprypin> but hey, maybe it's time to cut the losses
<oprypin> it just ain't happening soon
<FromGitter> <marksiemers> When you say libraries - crystal libraries, or other languages? Same question for standard library
<oprypin> Crystal
<FromGitter> <marksiemers> So if parallelism is not built in to 1.0, as soon as it is added, then none of the libs will be compatible - is that the issue?
<FromGitter> <marksiemers> Would it be a huge PIA to maintain a 1.0 (w/o parallelism) and a 2.0 (with it) concurrently for a long time frame (~3 years) (sorry about the pun)
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<oprypin> 1. yes 2. obviously yes
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<FromGitter> <extremety1989> guys i do have a question what is difference using TCP server and WEBSOCKET
<FromGitter> <extremety1989> require "socket" ⏎ ⏎ channel = Channel(String).new ⏎ ⏎ spawn do ... []
<FromGitter> <extremety1989> SOCKETS = [] of HTTP::WebSocket
<livcd> Go has a backing of multibillion dollar corporation and is also extremely popular in China because chinse people in general admire Google. Also Go is lets say a finished project which is just being polished. Crystal on the other hand...But we all know this :)
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<Papierkorb_> extremety1989, what's your question?
<FromGitter> <extremety1989> @FromIRC what is better HTTP::WebSocket or TCPServer
<Papierkorb_> ..wut?
<Groogy> Morning!
<Groogy> o7
<FromGitter> <extremety1989> =)
<Papierkorb_> Groogy: o/
<FromGitter> <extremety1989> hahaha
<Groogy> donno why I accidentally saluted
<FromGitter> <extremety1989> what is better HTTP::WebSocket or TCPServer ?
<Papierkorb_> extremety1989, you're comparing pears to apples
<Groogy> also so nice everything is released and the forums/reddit are just people talking about crazy shit they managed to do
<FromGitter> <extremety1989> really ?
<Papierkorb_> ..yes?
<Papierkorb_> Please read up on what TCP and WebSocket is. Even the wikipedia page will suffice.
<FromGitter> <extremety1989> i will
<FromGitter> <extremety1989> just wanted to know
<FromGitter> <extremety1989> what is better approche
<Papierkorb_> You didn't even state a full question. Posting a blob of code (that's not even formatted) is not a question.
<Papierkorb_> Help the helper.
<Groogy> TCP is a protocol, websocket is an implementation of it isn't it?
<FromGitter> <extremety1989> well for me it is kinda same thing ))
<Papierkorb_> TCP is the Transmission Control Protocol, a stateful and stream-based protocol on OSI Layer 4. WebSocket builds upon TCP, also stateful but message/datagram based.
<Papierkorb_> What's better? The V4 Engine or a Porsche?
<FromGitter> <extremety1989> ahha okey))
<FromGitter> <extremety1989> thank you
<Papierkorb_> Please read up on that, it'll help you tremendously in the general case
<Groogy> for some reason every time you guys in this chat say WebSocket I read it as WinSocket and I shiver
<FromGitter> <extremety1989> i know that, i just wanted to know what is much better in perfomance in Crystal lang
<Papierkorb_> Groogy: What does the WSA_Init shit do? Nobody knows!
<Groogy> extremety you are learning right now right? What's your project you are doing to learn stuff?
<FromGitter> <extremety1989> i just started to learn crystal, iused to work with nodejs socket io
<livcd> bararchy: Do you have a plan B if using Crystal backfires on you ?
<Groogy> Yeah no but I mean what are you implementing to learn crystal?
<Groogy> i.e since you are so concerned about performance from the get go as learning the language
<FromGitter> <extremety1989> any real-time application
<Groogy> (I've seen you put a lot of emphasis on it so)
<FromGitter> <extremety1989> go lang ?
<Papierkorb_> Please define 'real-time application'
<FromGitter> <extremety1989> chat application
<Papierkorb_> Then performance is your least worry. You want a WebUI?
<FromGitter> <extremety1989> i have his repo
<Papierkorb_> You have to use WebSockets then.
<FromGitter> <extremety1989> not even working ))
<Groogy> Focus on just learning and getting something done for now, I believe it is better to learn by fucking up if you aren't bound by actual deadlines/getting shit done
<FromGitter> <extremety1989> his implementation with postgres does not work..
<Papierkorb_> I agree with Groogy
<Papierkorb_> Getting shit done > ain't shits getting done
<FromGitter> <extremety1989> ahha ))
<Groogy> i.e if you kill performance by creating way too many tmp arrays unnessecairly you'll both learn to not do that ever again but also how to find them and fix it
<FromGitter> <extremety1989> here is exemple
<FromGitter> <extremety1989> i try to learn
<FromGitter> <extremety1989> class Topic ⏎ ⏎ ```code paste, see link``` ⏎ ⏎ end []
<FromGitter> <extremety1989> get "/topics" do ⏎ ⏎ ```topics = Topic.all ⏎ puts``` ⏎ ⏎ end []
<FromGitter> <extremety1989> does not works
<FromGitter> <extremety1989> in documentation there is mapping
<FromGitter> <extremety1989> topics.mapping
<Papierkorb_> missing `require "json"`
<FromGitter> <extremety1989> i do have it))
<FromGitter> <extremety1989> require "kemal" ⏎ require "json" ⏎ require "./db/connection" ⏎ require "./models/" ⏎ public_folder "src/public" ... []
<FromGitter> <extremety1989> inserting works
<FromGitter> <extremety1989> Error in src/ undefined method 'map' for PG::ResultSet (did you mean 'tap'?) ⏎ ⏎ ```puts ⏎ ^~~``` []
<FromGitter> <extremety1989> ahha
<Papierkorb_> Surround your code pastes with ``` (Three backticks) to enable highlighting and all the good stuff
<FromGitter> <extremety1989> okey,sorry i didnt know that
<Papierkorb_> don't worry, you probably never used gitter so how are you supposed to know
<FromGitter> <extremety1989> ``````
<FromGitter> <extremety1989> ```code paste, see link``` []
<Papierkorb_> there should be `DB.mapping` to map your topic class to the database
<FromGitter> <extremety1989> okey
<FromGitter> <extremety1989> i will try
<FromGitter> <extremety1989> ``````
<FromGitter> <extremety1989> Error in src/ undefined method 'mapping' for Connection::DB:Module ⏎ ⏎ Connection::DB.mapping({ ⏎ ⏎ ``` ^~~~~~~``` []
<FromGitter> <extremety1989> ```code paste, see link``` []
<FromGitter> <extremety1989> [development] Kemal is ready to lead at ⏎ ⏎ #<PG::ResultSet:0x292c540> ⏎ ⏎ 2017-11-17 11:05:09 +0100 200 GET /topics 87.62ms []
<FromGitter> <extremety1989> def self.transform_messages(messages_table) ⏎ ⏎ ```code paste, see link``` ⏎ ⏎ end []
<FromGitter> <extremety1989> ```code paste, see link``` []
<FromGitter> <extremety1989> it says to_hash method is undefined
<FromGitter> <extremety1989> undefined method 'to_hash' for DB::ExecResult
<Groogy> and back from lunch
<Papierkorb_> Just why is the query planner of Neo4j so trash >_>
<FromGitter> <extremety1989> lol
<Groogy> anyone know a good graphical svn client? need to work on an old repo and I don't want to relearn svn ( ´_ゝ`)
<Groogy> for arch
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<crystal-gh> [crystal] MakeNowJust opened pull request #5307: Don't use `{{yield}}` outside a macro (master...fix/crystal/cant-use-yield-outside-a-macro)
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<faustinoaq> >> [0x679bff14d].map(&.to_s(36)).join
<DeBot_> faustinoaq: # => "crystal" -
<FromGitter> <monouser7dig> @Groogy isn't there some git integration
<faustinoaq> Hi How Can I convert String to Hex?
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<FromGitter> <jdbann> Is there an equivalent of Timecop for Crystal? Or a way to stub ``?
<Groogy> @monouser7dig yeah but it is super slow
<Groogy> the first time around when it parses the entire repo
<Groogy> with old repo I mean really old and a lot of history
<FromGitter> <Rinkana> ```code paste, see link``` []
<FromGitter> <Rinkana> This benchmark yields: ⏎ ⏎ ```code paste, see link``` []
<FromGitter> <bararchy> livcd I put my hopes with Crystal, the thing about it, and other languges, it's open-source, we can always fork our own if things go sower and slowly move to another lang, though, I don't see this as a real posibility
<FromGitter> <monouser7dig> ```code paste, see link``` []
<FromGitter> <monouser7dig> int 218.27M ( 4.58ns) (±10.91%) 1.09× slower ⏎ float 238.84M ( 4.19ns) (± 9.80%) fastest
<FromGitter> <monouser7dig> +1 is to Javaid zero division, should be in the int version as well
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<FromGitter> <monouser7dig> although that won't even work cause it's in the range Int::MIN Int::MAX
<FromGitter> <monouser7dig> you say float should be much faster?
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<FromGitter> <Rinkana> I'm not saying that. But in the article it states that it should be faster because CPU's are optimized for float operations. And in both our benchmarks floats are indeed faster
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<FromGitter> <monouser7dig> yes
<FromGitter> <jdbann> Great! Thanks @faustinoaq
<Papierkorb_> would be kinda news if CPUs were any good at floats. They just suck at divisions.
<faustinoaq> ‎Papierkorb_‎, How can I list online users on IRC?
<Papierkorb_> huh? your client should have a nick list to the right
<Papierkorb_> or on the left. somewhere.
<faustinoaq> Oh, ok, but can I use some IRC command too?
<Papierkorb_> float is much better than expected, but still worse thant int.
<Papierkorb_> depends on your client if it actually sends commands you give it
<Papierkorb_> If it does, `WHO #channel` should give it
<faustinoaq> Ok, Thank you! :) BTW, Do you know how convert String to Hex? something like:
<faustinoaq> >> [0x679bff14d].map(&.to_s(36)).join
<DeBot_> faustinoaq: # => "crystal" -
<Papierkorb_> Slice#hexstring
<faustinoaq> but reverse String to Hex
<faustinoaq> ‎Papierkorb_: Thank you again! :)
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<FromGitter> <faustinoaq> *ignore this message, testing IRC bot*
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<faustinoaq> [[Crystal (programming language)]]
<FromGitter> <faustinoaq> *ignore this message, testing IRC bot*
<faustinoaq> <@faustinoaq> >> p "Hi".to_slice.hexstring
<faustinoaq> >> p "Hi".to_slice.hexstring
<DeBot_> faustinoaq: "4869" - more at
<faustinoaq> >> p "0x4869".to_s(36)
<DeBot_> faustinoaq: in /usr/lib/crystal/ undefined method 'write_utf8' for Int32 -
<faustinoaq> >> p 0x4869.to_s(36)
<DeBot_> faustinoaq: "eax" - more at
<Papierkorb_> well, hexstring is of course a different base
<faustinoaq> <@Papierkorb_> Oh, What I need to do to get "Hi" from hexstring then?
<Papierkorb_> Well, the 'table' crystal uses is basically `[ 0, 1, 2, ... , a, b, c, ... , z ]`.
<Papierkorb_> Try to figure out how to make .to_s(36) emit a single `a`, then look for `h`. Then try to make it emit a second character.
<faustinoaq> :+1:
<Papierkorb_> There's a simple rule on what math operation you need to do, including which operands you need to give it
<Papierkorb_> to make it 1337, just turn the decimal number into a hex number, and post that.
<faustinoaq> <@Papierkorb_> Ok, Thank you!, let me try :)
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<hellomyfellow> hello can I view a list of all the versions of crystal with data etc?
<Papierkorb_> "data"?
<hellomyfellow> date!
<Papierkorb_> .. their release date?
<hellomyfellow> yes..
<hellomyfellow> is there any list of all this?
<Papierkorb_> just check the git.
<hellomyfellow> the git? ok..
<Papierkorb_> and/or the CHANGELOG
<hellomyfellow> but changelog? wheres a changelog
<Papierkorb_> there's a actual file.
<hellomyfellow> okay found it thx
<hellomyfellow> i think it should also be viewable on the website
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<hellomyfellow> how can I run C code with crystal?
<hellomyfellow> call C code*
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<z64> check out the section on C bindings from the crystal book:
<hellomyfellow> hm. I definitely entered "C" in this and this doesnt appeared
<hellomyfellow> buut can I also write C code in crystal? and run this
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<crystal-gh> [crystal] RX14 closed pull request #5296: Remove mistake example in query property comment (master...correct-query-property-doc)
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<FromGitter> <codenoid> hi, is `Time.monotonic` removed in crystal 0.23.1 ?
<hellomyfellow> uhhh.. im very sure Time.monotic is added first in 0.24
<FromGitter> <codenoid> okay then
<FromGitter> <joegyoung> I am looking for a way in crystal to start the bash shell within crystal... Any help?
<FromGitter> <codenoid> `some shell script (?)`
<FromGitter> <codenoid> `
<FromGitter> <joegyoung> Let me check...
<FromGitter> <joegyoung> Thanks it!!!! Thank you !!!
<FromGitter> <codenoid>
<FromGitter> <codenoid> okay
<FromGitter> <claisne> Hello does anyone know what the dup method does on a simple object ?
<FromGitter> <claisne> i feel like I had to redefine the #dup method on this object
<Papierkorb> #dup does by definition a shallow copy.
<FromGitter> <claisne> which is a direct translation of what I wrote no ?
<FromGitter> <claisne> because it did not seem to work without a redefinition
<Papierkorb> You're not specifying what "did not work"
<Papierkorb> did your house catch on fire?
<Papierkorb> Or what was unexpected?
<FromGitter> <claisne> calling dup on a Move object
<FromGitter> <claisne> without redefining it
<FromGitter> <claisne> buts its ok I'll find the cause by myself
<FromGitter> <claisne> sorry for the trouble
<FromGitter> <Fryguy> shallow copy means it doesn't follow references
<FromGitter> <Fryguy> so the Array and Set will be copied as references (hence pointing to the same thing)
<FromGitter> <Fryguy> you probably want `clone` instead for a deep copy
<Papierkorb> >> class Foo; end; a =; pp a.object_id, a.dup.object_id
<DeBot_> Papierkorb: a.object_id # => 93867079143392 - more at
<Papierkorb> >> class Foo; end; a =; pp [ a.object_id, a.dup.object_id ]
<DeBot_> Papierkorb: [a.object_id, a.dup.object_id] # => [94424165826528, 94424165826512] - more at
<Papierkorb> Works as intended.
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<FromGitter> <simaoneves> hey guys
<FromGitter> <simaoneves> i can't find the Windows support and parallelism branches
<FromGitter> <simaoneves> any ideas?
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<FromGitter> <simaoneves> yes, i saw that, and "windows" branch aswell
<FromGitter> <simaoneves> but both are not updated in a lonnggggg time
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<crystal-gh> [crystal] straight-shoota opened pull request #5308: Docs: Fix matching nested type references in markdown renderer (
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<FromGitter> <claisne> if anyone like to criticize code, could you review my checkers move generation code ? ⏎ ⏎ thanks
<FromGitter> <Fryguy> I just glanced at it, but it looks pretty nice to me. ⏎ ⏎ On cool thing that Crystal has is a simpler comparison operator for `a < x < b`: ⏎ ⏎ `square.rank >= 0 && square.rank < @size` can be written as `0 <= square.rank < @size` []
<FromGitter> <Fryguy> Its minor, but it reads nice
<FromGitter> <claisne> great thanks
<FromGitter> <Fryguy> One other minor thing is that `self.` isn't necessary on methods's implied...but you do need it when calling a setter method
<FromGitter> <claisne> ok I'll refactor!
<Papierkorb> #set_starting_board, #moves and #piece_captures are way too complex
<Papierkorb> Empty `()` can (= should) be omitted: `foo()` -> `foo`
<FromGitter> <claisne> how would you simplify #set_starting_board ? decompose for white and black ?
<Papierkorb> That'd be a good refactor, yes
<Papierkorb> The if also doesn't have a branch for `rank == (@size / 2)`. But that thing's gone in a minute anyway now, so
<Papierkorb> ..
<FromGitter> <claisne> what do you mean ?
<FromGitter> <claisne> if ```rank === (@size / 2)``` its only empty pieces
<Papierkorb> For rank in { @size / 2 - 1, @size / 2 }, no branch matches.
<FromGitter> <claisne> yes indeed there are no pieces
<Papierkorb> The current, unrefactored, code doesn't make this intention clear
<Papierkorb> Lines 73/74 could benefit from trailing-if: `piece.promote if promotion_square?(..)`
<FromGitter> <claisne> great didn't know about this one thanks
<Papierkorb> the algorithm in #piece_captures could actually be its own class
<FromGitter> <Fryguy> oh interestnig...i didn't know single-line do/end blocks worked in Crystal:
<FromGitter> <Fryguy> For some reason I thought you *had* to use curly braces
<Papierkorb> Yeah and those should be refactored to use `{ }` instead of do/end
<FromGitter> <Fryguy> yeah that ^^ :)
<FromGitter> <claisne> do/end is not the recommended way ?
<Papierkorb> do/end for multi-line blocks, { } for single line
<FromGitter> <Fryguy> Not for in-line block...prefer curly braces
<FromGitter> <claisne> ok great is there any linter available for crystal ?
<Papierkorb> dunno if the formatter catches that
<FromGitter> <claisne> humm I only find a atom plugin
<FromGitter> <Fryguy> `crystal tool format` gets you most of the way there
<Papierkorb> `crystal tool format --help`
<FromGitter> <claisne> great thanks to both of you I'll stop spamming now
<FromGitter> <Fryguy> some editors, like SublimeText, auto-format on save, which is nice
<Papierkorb> ..if you like that.
<Papierkorb> #king_steps is mis-indented by 2 spaces
<FromGitter> <claisne> I'll run the format tool on all the files
<faustinoaq> >> hex = [] of Char; p "hello".to_slice.hexstring.scan(/../).map(&.to_a.first).map(&.to_s.split("").reverse.map_with_index { |v, i| v.to_i(36)*(16**i) }.sum).map { |n| hex << n.chr; n.chr.to_i(36).to_s(36) }.join; p "0x" + hex.join.to_i(36).to_s(16)
<DeBot_> faustinoaq: "hello" - more at
<faustinoaq> >> p 0x1be15dc.to_s(36)
<DeBot_> faustinoaq: "hello" - more at
<faustinoaq> <@Papierkorb> I did it! :)
<Papierkorb> gratz
<faustinoaq> >> hex = [] of Char; "hello".to_slice.hexstring.scan(/../).map(&.to_a.first).map(&.to_s.split("").reverse.map_with_index { |v, i| v.to_i(36)*(16**i) }.sum).map { |n| hex << n.chr; n.chr.to_i(36).to_s(36) }.join; p "0x" + hex.join.to_i(36).to_s(16)
<DeBot_> faustinoaq: "0x1be15dc" - more at
<Papierkorb> >> "hello".chars.reverse.map_with_index{|c, i| (c - 'a' + 10) * (36 ** i)}.sum.to_s(16)
<DeBot_> Papierkorb: # => "1be15dc" -
<FromGitter> <codem4ster> can I do smt like this; ⏎ ⏎ ```code paste, see link``` []
<FromGitter> <codem4ster> or I need to use macros only for this type of thing?
<faustinoaq> <@Papierkorb> Thanks you! :)
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<faustinoaq> >> "hello".to_i(36).to_s(16)
<DeBot_> faustinoaq: # => "1be15dc" -
<faustinoaq> lol
<faustinoaq> <@Papierkorb> XD
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<faustinoaq> <@Papierkorb> I think I fell into xyproblem XD
<Papierkorb> ?
<faustinoaq> I didn't know what I was asking for
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<robacarp> I've been wondering for a while, why are the majority of line numbers in stack traces '??'
<Papierkorb> shouldn't be the majority. only the first 1-3
<Papierkorb> (or last, depending on how you look at it)
<FromGitter> <Fryguy> They are mostly ?? in my stacktraces too
<robacarp> I only have the one stacktrace I'm looking at now, but I think almost all of the stack frames I see and work through are just "at ??"
<Papierkorb> platform? version of LLVM and crystal?
<robacarp> macos and crystal in homebrew, not sure how to check llvm
<robacarp> oh: Crystal 0.23.1 (2017-10-12) LLVM 4.0.1
<FromGitter> <Fryguy> same for me
<Papierkorb> may be a mac issue then
<robacarp> macos high sierra 10.13.1
<FromGitter> <Fryguy> I assumed that mine was bad because in my project I mes with crystal_main, so I'm interested to see someone else has the issue too
<Papierkorb> always worked for me
<FromGitter> <Fryguy> macos sierra 10.12.6 for me
<robacarp> I'll...submit an issue I guess
<faustinoaq> <@robacarp> I think 0.24.0 has been improved, see
<robacarp> oh awesome.
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<faustinoaq> <@‎Papierkorb> What Did you do to use a domain name in your IRC Whois instead of an IP?
<robacarp> faustinoaq: the easiest way is to connect from an ip address where the reverse lookup is the domain
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<Papierkorb> ^
<faustinoaq> <@robacarp> Thank you! So, I can't do that on my home ip, right?
<Papierkorb> Probably not
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<faustinoaq> Ok :P
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<robacarp> there is a way to get a hostmask from freenode, but I've never gone so far
<robacarp> seems like it isn't that hard:
<faustinoaq> <@robacarp> Thank you! I'll take a look +1
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<FromGitter> <exts> is there a shard out there to format cli data? built for cli, like I want to build a table and have the library format the padding and all that jazz.
<FromGitter> <exts> if not i may have a weekend project I can work on
<FromGitter> <eliasjpr> There is shell-table shard @exts
<FromGitter> <exts> thanks @eliasjpr will check it out
<FromGitter> <exts> looks like the shard site's down, gonna check github
<FromGitter> <exts> you're a life saver @eliasjpr that's exactly what I wanted
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<FromGitter> <eliasjpr> 👌🏻👍🏻
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