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Fish 4.0: The Fish of Theseus

fishshell.com

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Re: Fish 4.0: The Fish of Theseus

#101

Post by pornel »

freedomben wrote: post #12

> The one platform we care about a bit that it does not currently seem to have enough support for is Cygwin, which is sad, but we have to make a cut somewhere. > We’re also losing Cygwin as a supported platform for the time being, because there is no Rust target for Cygwin and so no way to build binaries targeting it. We hope that this situation changes in future, but we had also hoped it would improve during the alm…

There's nothing technically stopping Rust from supporting Cygwin, except lack of volunteers to complete the port:

https://github.com/rust-lang/rust/issues/5526

(this feature request has been open for 12 years)

Re: Fish 4.0: The Fish of Theseus

#103

Post by pornel »

Too wrote: post #93

Surprised to see the line count go up so much, 56K LOC of C++ to 75K of Rust. The blog attributes it to rustfmt using less oneliners. Even so, i would believe that should be a small factor compared to the heaps of duplicate code you get from c++ header files and all the other syntax ergonomics rust gives you. Is this typical for such a translation. They also mention addition of new features contributing to more code,…

Rust is denser than C, but both Rust and C++ can work on similarly high level of abstraction.

It may be just down to rustfmt. It really adds a lot of vertical sprawl. I personally can't stand how much rustfmt makes multi-line code explode.

Re: Fish 4.0: The Fish of Theseus

#104

Post by gorset »

ComputerGuru wrote: post #52
sunshowers wrote: post #19

Earlier quoted context omitted.

(hi Ed!) I would definitely love to see Cargo have the ability to do this -- it means that `cargo install --locked` stays as a viable approach. It probably won't apply to fish, but I think being able to run a post-install command from the binary you just installed would suffice for my needs.

We've actually added support to make single-binary fish deployments possible by (optionally) bundling static resources that would be part of the CMake-based deployment into the binary itself and having it unwrap those on first execution. The limitations of Cargo and the idiomatic `cargo install` usage primarily motivated this.

I'm a big fan of this solution! It's always been annoying to perform all the ceremony involved in deploying a system with a bunch of files, with config, scripts and system written in a bunch of different languages.

In my current project I just wrote the installer and config generation as part of the main method. Gets rid of a lot of complexity, with a simpler build, and is arguably easier to maintain. Single language, single binary.

Re: Fish 4.0: The Fish of Theseus

#105

Post by nindalf »

outlore wrote: post #86

I am curious to ask others here, are there other low-config alternative tools like Fish that, looking back, now seem like a no brainer? Ghostty is a recent example, Helix seems like another. I’d love to know about other tools people are using that have improved or simplified their lives.

Agree with you on helix. I love it.

Atuin for improved history search.

Starship for an improved shell prompt.

zoxide - better cd

ripgrep - better grep

just - a command runner. I put project specific commands/scripts in there so I don’t have to remember.

All of these are indispensable for me.

Re: Fish 4.0: The Fish of Theseus

#106

Post by dwattttt »

Spoof7726 wrote: post #4

> Fish also uses threads for its award-winning (note to editor: find an actual award) autosuggestions and syntax highlighting, and one long-term project is to add concurrency to the language. (note to editor: find an actual award)

Seriously, can someone find them an award? I think they've earned it.

Re: Fish 4.0: The Fish of Theseus

#107

Post by _zagj »

thayne wrote: post #55
_zagj wrote: post #22

Earlier quoted context omitted.

It's strange how the article starts off complaining about C++'s platform "issues": > We’ve experienced some pain with C++. In short: > tools and compiler/platform differences before conceding that, because of Rust, they 1) are actually dropping support for a platform they previously supported and 2) can only support (in theory) a small fraction of those platforms supported by g++, but that that's OK because those are…

Neither c++ nor rust is a clear winner in portability and platform support. C++ is available on more platforms, but in some ways rust makes it easier to support multiple platforms than it is in c++, for example using rustup to install the latest version of the compiler. What they got from this isn't that they can now support more platforms, but that they now don't have to spend as much effort on supporting dealing wi…

> Neither c++ nor rust is a clear winner in portability

C++ is the clear winner in portability because of GCC and the wealth of platforms it supports. You can argue you don't care about supporting, e.g., OpenBSD on PPC, but trying to hand-wave away this advantage C++ has over Rust is disingenuous.

Re: Fish 4.0: The Fish of Theseus

#109

Post by zazaulola »

ComputerGuru wrote: post #50
johnthuss wrote: post #41

Earlier quoted context omitted.

I write all my scripts with the hash bang as "#! /bin/bash" so even though fish is my interactive shell, I still use bash for all shell scripts. I think the restrictions you mention only apply if you use "#! /bin/sh" rather than bash specifically.

Just fyi, you should use `#!/usr/bin/env bash` instead of `#!/bin/bash` or whatever because you can't assume the location of bash (but the location of `env` is indeed portably fixed). e.g. FreeBSD (and macOS?) has bash at `/usr/local/bin/bash`

I'm confirming. Often, when you run a script on more than just your own computer, bash is located in unexpected places.

For me, for example: `/data/data/com.termux/files/usr/bin/bash`

In such cases, scripts containing the absolute path to bash in shebang do not run correctly.

Re: Fish 4.0: The Fish of Theseus

#110

Post by noctune »

boris wrote: post #81
chubot wrote: post #8

Congrats to the fish team! Great writeup with lots of interesting detail. I wonder if this is the biggest project that has moved from C++ entirely to Rust (or maybe even C to Rust?) It probably has useful lessons for other projects. If I'm reading this right, it looks like fish was not released as a hybrid C++ / Rust program, with the autocxx-generated bindings. There was a release during that time, but it says "fish…

> Feature Detection Is Better than Version Detection The problem with feature detection (normally referred to as configuration probing), at least the way it's done in ./configure and similar, is that it relies on compiling and potentially linking (and sometimes even running, which doesn't work when cross-compiling) of a test program and then assuming that if compilation/linking fails, then the feature is not availabl…

The XZ utils supply chain attack also used this to sneakily disable Linux Landlock: https://news.ycombinator.com/item?id=39874404
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