Wilfred Hughes @_wilfredh
Programming language development, human factors, and a healthy dose of Emacs. Also at https://t.co/faGheKE6VH wilfred.me.uk California, USA Joined June 2009-
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Noodling with an interpreter for a statically typed language with reified types (e.g. a list knows what type it contains). Currently I have a single representation of types in both the runtime and the type checker. I think that's a good thing?
I still find it weird that constructors aren't first class functions in OCaml. `id Just` is legal in Haskell, but `id Some` is an error in OCaml. Are there any advantages of the OCaml approach?
I've written my first man page! github.com/Wilfred/diffta… Troff syntax is new to me and a little hard to read -- apparently you shouldn't use blank lines. Turns out you can use pandoc to convert markdown to troff instead.
Watching youtu.be/KWB-gDVuy_I and I'm struck by how weird constructors are as an API. * They promote total functions, making it hard to do validation. * They're hard to split up, because they have special access to unfinished data. * They're like a framework: you get called.
Amazing blog post about running a modern Linux kernel on Chumby hardware, investigating bad CPU numbers from top, and finding a Linux kernel bug from 2009! downtowndougbrown.com/2024/04/why-is…
It's weird how even pure languages tend to treat the Unix execution model as ambient state. Are there any PLs that define a main function like this? fn main(args, stdin, stdout, env) -> exit code
I've written a very small, very bad, type checker for my toy programming language. Within three days, it found a bug in a program I was writing!
I think software maintainers can perceive their projects as way more buggy than they actually are. You spend more time looking at the bug tracker, which is (hopefully!) not representative of typical usage.
Difftastic GitHub Diff
tap> is an elegant Clojure debugging feature: it passes the argument to any functions registered with add-tap. You might set up a custom printer for your data type, or save values for later examination, and you can easily disable the tap too. dev.to/hlship/debuggi…
I've released difftastic 0.57! In this release: * A bunch of improvements around detection and display of binary files. * Fixed some diffing issues with (ironically) text files. * Better diff results for Scheme. github.com/Wilfred/diffta…
I'm delighted that so many people are getting value in difftastic, but there has been a significant increase in new issues recently! Hopefully this is a temporary bump from HN. It's a genuine risk from creating a generic tool: if 1% of devs use it, that's a huge userbase.
The Bitter Lesson: how implementing generic search and scaling compute outperforms custom logic in many situations: incompleteideas.net/IncIdeas/Bitte…
Thinking more about the "auto eval definitions" approach, I think it breaks down when debugging. If I want to step through the existing definition, it'd be really awkward to re-evaluate the definition at my cursor.
The lisp model of programming is generally: write a function evaluate it, interactively call it with some arguments, iterate. Jupyter is similar. Why not automatically evaluate definitions (not expressions) whilst working? It seems like a satisfying way to work with code.
I've release difftastic 0.56! In this release: * Added support for Scheme and Smali * Improved JS, TypeScript, QML and Perl parsers * File permission changes are now reported github.com/Wilfred/diffta…
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@_wilfredh We do this in Dart, relevant code of how we represent interface types: - Compile time: github.com/dart-lang/sdk/… - Runtime: github.com/dart-lang/sdk/… They have the same structure (class + type arguments), but in runtime you can do with a simpler type representation for the types,
@_wilfredh github.com/ocaml/ocaml/pu… should list most points
@_wilfredh I can speculate: - constructors always inlined - never dispatching constructor calls by function pointer allowing local reasoning about the value constructed
@_wilfredh That's how pretty much everybody does it these days. Asciidoc is another sensible choice.
@_wilfredh We saw a modest speed up in Ruff too for some hot paths.
the reason naming things is the hardest problem "in computer science" is that it's not a computer science problem, it's a psychosocial summoning ceremony whose aim is to conjure exactly the desired concepts in other people's minds
Sometimes I push a PR or commit that makes me think, if the reviewer is using difftastic it will be very clear, but if they are using a regular diff viewer they will be like wtf
✨ Programming langs & Open Source - based on GH search Repository created after:2020 Stars: Greater than 1000 1. Python - 2.2k 2. Javascript - 764 3. Go - 657 4. Rust - 521 5. C++ - 422 6. Java - 308 7. C - 279 8. C# - 258 9. Kotlin - 190 10. Swift - 137 #programming
"Sell a result, not a tool." Headlines should be a promise around the result the customer wants and that I think we can actually deliver. NOT about what the software simply does.
@_wilfredh Type systems are too effective! And this is why we only have clunky and bad ones. No need to go 100% with the solution.
Haskell is an open source language! GHC is accepting contributions! You can just propose improvements and fix things 😄
@welltypedwitch @Idonbelonghere @Las______ @yawaramin @BartoszMilewski We do this in CSI: Haskell, but we let you control the length of the trace. We found that a length of around 500 was enough to find 90% of the bug causing locations! Soon to be integrated into GHC proper :)
@_wilfredh This is the feature I mentioned to you on that PR a while back; I feel like it might be a good fit for difftastic.
@_wilfredh @sanityinc Assuming this is it: github.com/nlewo/comin
@sullyj3 @_wilfredh And "comin" lets you set a machine to update itself from a branch, which is a nice workflow. GitHub.com/lewo/comin
@sashopopov Amazing tool, but I had a few problems to make it default for git that were related to some ENV variables. But yeah, I would never come back to regular diffs.
Fiddled with Difftastic yesterday. It's quite cool structural diff tool, meaning that it can filter a lot of the meaningless noise away that git default diffing does. #git #coding github.com/Wilfred/diffta…
How do AI code generators effect students? New blog post with @MajeedKazemi summarizing our recent research. austinhenley.com/blog/learningw…
Thank you :D love it
I've released difftastic 0.57! In this release: * A bunch of improvements around detection and display of binary files. * Fixed some diffing issues with (ironically) text files. * Better diff results for Scheme. github.com/Wilfred/diffta…
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