174 lines
3.5 KiB
Markdown
174 lines
3.5 KiB
Markdown
% GHCup
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% Julian Ospald
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% June 07, 2024
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# GHCup
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## Intro
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[Haskell Survey 2022](https://taylor.fausak.me/2022/11/18/haskell-survey-results/#s2q1)
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## Intro (pt. 2)
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haskell.org:
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## What is GHCup (simplified)?
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```sh
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curl -s -L 'https://downloads.haskell.org/~ghc/9.6.5/ghc-9.6.5-x86_64-fedora33-linux.tar.xz' |
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tar -xJ -C /tmp &&
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cd /tmp/ghc-9.6.5-x86_64-unknown-linux/ &&
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./configure --prefix="$HOME/.local" &&
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make install &&
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rm -rf /tmp/ghc-9.6.5-x86_64-unknown-linux/
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```
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## How it started
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::: incremental
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* 🤹 small team at work on different platforms
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* 🧑💻 SHELL + POSIX
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* 🦾 first version was 165 LOC
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* 🙏 only installer at that time was stack
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:::
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## Goals
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::: incremental
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- ☮️ unification
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- unix principles
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- 🛠️ do one thing and do it well
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- ⚗️ pipes, compose stdout and stdin
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- 🎁 good re-distribution
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- 🛣️ user experience (get out of the way)
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:::
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## What is GHCup really?
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* [https://hasufell.github.io/posts/2023-11-14-ghcup-is-not-an-installer.html](https://hasufell.github.io/posts/2023-11-14-ghcup-is-not-an-installer.html)
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::: incremental
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* {#id .class width=32 height=32px} installer
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* {#id .class width=32 height=32px} distribution channel
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* {#id .class width=32 height=32px} feedback channel
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* {#id .class width=32 height=32px} testing/QA gateway
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* {#id .class width=32 height=32px} provider of sane defaults (e.g. "recommended" GHC version)
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* {#id .class width=32 height=32px} glue for holistic toolchain experience
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- stack integration
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- VSCode integration
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- cabal-install integration
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* {#id .class width=32 height=32px} CI provisioning (e.g. github actions)
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:::
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## Upstream
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Supported tools/dependencies:
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::: incremental
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- GHC
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- Cabal
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- HLS
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- Stack
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:::
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## Downstream
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Users:
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::: incremental
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- {#id .class height=32px} Haskell developers
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- beginners / advanced
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- student courses
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- companies
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- {#id .class width=32 height=32px} end users (e.g.compiling pandoc from source)
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- {#id .class width=32 height=32px} GitHub CI
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- GitHub images
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- Haskell repos
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- 🪞 mirrors
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- [sjtug](https://mirror.sjtu.edu.cn/docs/ghcup)
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- 🧰 tools
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- [vscode-haskell](https://github.com/haskell/vscode-haskell)
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- [Haskell playground](https://play.haskell.org/)
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- [nvim-lsp-installer](https://github.com/williamboman/nvim-lsp-installer)
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:::
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## How does it work?
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**Components:**
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::: incremental
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- {#id .class height=32px} cli interface
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- {#id .class height=32px} file layout / installation destination
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- {#id .class height=32px} bindist selection
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- 🧱 tui interface
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:::
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## Basic CLI
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::: incremental
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* show all available tools / versions
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```sh
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ghcup list
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```
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* install a tool
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```sh
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ghcup install ghc latest
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```
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* make a tool version the default
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```sh
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ghcup set ghc latest
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```
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* remove a tool version
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```sh
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ghcup rm ghc 9.10.1
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```
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:::
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## Where does it install?
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::: incremental
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* root dir
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```sh
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$ ls ~/.ghcup
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bin cache config.yaml db env ghc hls logs share tmp trash
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```
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* GHC and HLS are installed into sub-directories
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```sh
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$ ls ~/.ghcup/ghc
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8.10.7 9.0.2 9.2.8
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```
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* bin directory is mostly symbolic links
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```sh
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$ ls ~/.ghcup/bin
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ghcup
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cabal cabal-3.10.3.0
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ghc ghc-8.10 ghc-8.10.7 ghc-9.0 ghc-9.0.2 ghc-9.2 ghc-9.2.8
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```
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:::
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## Bindist selection
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*
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