<al2o3-cr>
neshpion: pry's default pager is less with a few options. check Pry::Pager::SystemPager.default_pager
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<al2o3-cr>
specifically -R option.
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<neshpion>
al2o3-cr: nice. i almost confused myself by checking that variable with PAGER still set... but unsetting PAGER showed me that it then defaults to `less -R -F -X`, options which i've now stolen for my own default :D
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<mjacob>
the general recommendation for organizing files in a project (e.g. a gem) seems that there should be one file per class and one folder per module ("namespace"), with the names converted to snake_case.
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<mjacob>
but what's the recommended way to require the files within a gem and make the classes available to users of the gem?
<mjacob>
i've seen examples where lib/gem.rb defines only the module Gem. i've seen examples where every file lib/gem/*.rb was required from lib/gem.rb (sometimes inside the "module Gem" scope, sometimes outside).
<RickHull>
mjacob: I don't strictly map the filesystem to the class/module hierarchy. it's good to make it sensible/predictable
<RickHull>
I am a big fan of "require structure" where each .rb file requires what it needs to function -- i.e. so the file can be required "naked" in irb, and its tests pass
<RickHull>
each.rb file requires what it needs -- and no more
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<RickHull>
there is another view that says lib/foo_project.rb should require "all the things" at the top, even if foo_project.rb itself doesn't need everything
<RickHull>
in my mind, that creates unnecessary require churn, where things are required that might not be needed in the current execution context
<mjacob>
what do you think about using zeitwerk?
<RickHull>
never used/heard of it. but I've been away for a while
<mjacob>
i can see how both ways have pros and cons. within my code i could pick any. but what would a user of my gem expect?
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<RickHull>
one thing that is tricky -- when you're developing your gem, make sure to use e.g. `ruby -Ilib path/to/script.rb`
<RickHull>
that is: include the current lib dir (e.g. /home/user/project/lib/foo-project.rb) so that your `require 'foo-project.rb'` can be resolved, without having the foo-project gem installed
<RickHull>
or e.g. `ruby -Ilib test/foo-project.rb`
<RickHull>
or e.g. `irb -Ilib` `>> require 'foo-project'`
<RickHull>
lots of people get tripped up trying to use require-relative unnecessarily
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<RickHull>
mjacob: I unequivocally recommend structuring your requires properly. That is, any symbol or name used in a given .rb file should require whatever file defines that symbol or name
<RickHull>
method / class / module / whatever
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<mjacob>
with python, i can install packages in "editable" mode, such that the list of installed packages has a link to my source directory. is there something like this in ruby?
<RickHull>
mjacob: not that I'm aware of. use `-I path/to/lib` so that you can resolve your libs
<RickHull>
also, keep in mind that my view is kind of an old school one. there may be newer tools that hide this stuff. but I still suspect my way is better, particularly for gem development
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<RickHull>
in particular, be aware that I try to avoid using Bundler. it's a great tool when it's needed, but it sometimes complicates things unnecessarily IMHO. again, I'm probably out of date
<mjacob>
RickHull: thanks for introducing me into your way of doing things! ;)
<mjacob>
i'm open to hearing an opposing view and forming my own opinion
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<RickHull>
I have lots of ruby repos that consist of what I consider clean code, and most of them are packaged as gems. I'm happy to answer any questions. but I'm using webchat for the moment until I get a more permanent IRC presence going
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<RickHull>
oh man, bad example. it looks like I'm only using that helper function in test/ -- I was trying to find an example of a file in lib/ that actually did `require 'compsci'`
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<desnudopenguino>
i'm starting a journey down writing a wrapper using FFI, and i'm not very familiar with C, in the structs in the C file i'm looking at, anyone in here have any experience going down this path, and have any suggestions for stuff to read or research?
<desnudopenguino>
wow, my brain totally skipped over a huge chunk of that, in the structs i'm looking at, there are a bunch of types that aren't in the types documentation for ffi, so i'm kind of hung up on what to do with that.
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<tsujp69>
so, gemset vs gemfile
<tsujp69>
Why do some people still cling to gemsets with RVM isn't bundler's Gemfile quite literally a project-level gemset equivalent?
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<jhass>
yeah, I've been arguing for years that a bundle --path vendor/bundle is functionally equivalent to gemsets for 99% of usecases
<jhass>
I guess it's changing habits :)
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<AndreYuhai>
Hey there, It's been a while!
<AndreYuhai>
I've got a csv file which is around 18 MB. I load it using CSV.read but then how can I destroy this so that it doesn't take up as much memory anymore?
<AndreYuhai>
Would making it nil be sufficient?
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<jhass>
AndreYuhai: do you really need to keep it in memory? Consider streaming via CSV.open / CSV.new
<AndreYuhai>
jhass, What I want to is to read different ranges of this CSV so I can run multiple scripts with different ranges
<jhass>
Ruby's GC is not giving memory it allocated back to the system aggressively. Obtaining memory from the system is quite the slow of an operation, so it's more performant this way. But it means that externally obersable memory usage might not equal actual live usage
<AndreYuhai>
jhass, So using CSV.open is the way to go?
<jhass>
not sure for your usecase exactly, it's the way to go for sequentially processing large amounts
<jhass>
but if you need to seek around it gets hairy
<jhass>
you might just have to live with the high memory usage. If it's a long running process I'd look into launching the task as a subprocess
<AndreYuhai>
jhass, Oh alright, thank you! I will probably keep reading all of it as you said.
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<nakilon>
there was some memory leak in CSV but I don't remember what was it about
<nakilon>
basically there are two methods to load the file and one of them is leaking, but which one? it's not stated in docs
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<jhass>
why would you document a memory leak rather than fix it? :D
<jhass>
or are you talking about memory bloat actually?
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<eydaimon>
I want to insert an image into the top corner of another image. What's a good toolkit to use for this?
<adam12>
eydaimon: You could probably use minimagick directly if that's all you need. Up to you for which API you want.
<eydaimon>
thanks :) looks like I can also do it with ffmpeg
<eydaimon>
is minimagick based on imagemagick ?
<adam12>
eydaimon: Yes. There are two libraries (iirc) and the other was rmagick. I think minimagick shells out (vs rmagick which did C interop).
<eydaimon>
thanks a bundhle :)
<adam12>
eydaimon: Cheers.
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<nakilon>
jhass, don't ask me ..D
<nakilon>
when I told about the leak in seattlerb's chat, they told me I'm idiot ..D
<nakilon>
(just a place that I tried previously to discuss ruby)
<nakilon>
IIRC the problem is that there are two ways to use the library and one is correct while another one kind of works but is leaking, and people have a problem with it
<nakilon>
eydaimon, also take a look at ruby-vips
<nakilon>
because it may consume much less resources than imagemagick
<jhass>
well, a lot people are confusing leaks and bloat in ruby and they're not always easy to tell apart too. Mainly due to the aformentioned tendency of the GC to hold onto memory it got from the OS for a little while, but also, as you discovered, there's too many easy ways to load too big files all at once into memory or construct really big strings otherwise
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<nakilon>
"It is written in pure Ruby" so it does not need neither imagemagick, nor vips or ffmpeg
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<nakilon>
jhass, was disconnecting... that was a leak -- there are two methods that both work like importing the file but you are supposed to use only one of them while another one isn't supposed to be called directly or something like that
<nakilon>
I don't wanna dive in it again, it's ungrateful
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<jhass>
sure :D
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<havenwood>
The ::read/::readlines vs ::foreach docs could be improved, but seem pretty clear as is.
<havenwood>
¯\_(ツ)_/¯
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