https://github.com/MercuryTechnologies/ghciwatch

ghci-based file watching recompiler for Haskell development
https://github.com/MercuryTechnologies/ghciwatch

ghci haskell inotify

Last synced: about 1 month ago
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ghci-based file watching recompiler for Haskell development

• Host: GitHub
• URL: https://github.com/MercuryTechnologies/ghciwatch
• Owner: MercuryTechnologies
• License: mit
• Created: 2023-06-07T20:29:49.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-05-22T18:36:22.000Z (7 months ago)
• Last Synced: 2024-05-22T21:20:28.826Z (7 months ago)
• Topics: ghci, haskell, inotify
• Language: Rust
• Homepage: https://mercurytechnologies.github.io/ghciwatch/
• Size: 1.68 MB
• Stars: 40
• Watchers: 41
• Forks: 6
• Open Issues: 39
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE

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README

        
# ghciwatch

























Ghciwatch loads a [GHCi][ghci] session for a Haskell project and reloads it

when source files change.

[ghci]: https://downloads.haskell.org/ghc/latest/docs/users_guide/ghci.html

## Features

- GHCi output is displayed to the user as soon as it's printed.

- Ghciwatch can handle new modules, removed modules, or moved modules without a

  hitch

- A variety of [lifecycle

  hooks](https://mercurytechnologies.github.io/ghciwatch/lifecycle-hooks.html)

  let you run Haskell code or shell commands on a variety of events.

  - Run a test suite with [`--test-ghci

    TestMain.testMain`](https://mercurytechnologies.github.io/ghciwatch/cli.html#--test-ghci).

  - Refresh your `.cabal` files with [`hpack`][hpack] before GHCi starts using

    [`--before-startup-shell

    hpack`](https://mercurytechnologies.github.io/ghciwatch/cli.html#--before-startup-shell).

  - Format your code asynchronously using [`--before-reload-shell

    async:fourmolu`](https://mercurytechnologies.github.io/ghciwatch/cli.html#--before-reload-shell).

- [Custom

  globs](https://mercurytechnologies.github.io/ghciwatch/cli.html#--reload-glob)

  can be supplied to reload or restart the GHCi session when non-Haskell files

  (like templates or database schema definitions) change.

- Ghciwatch can [clear the screen between reloads](https://mercurytechnologies.github.io/ghciwatch/cli.html#--clear).

- Compilation errors can be written to a file with

  [`--error-file`](https://mercurytechnologies.github.io/ghciwatch/cli.html#--error-file),

  for compatibility with [ghcid's][ghcid] `--outputfile` option.

- Comments starting with `-- $>` [can be

  evaluated](https://mercurytechnologies.github.io/ghciwatch/comment-evaluation.html)

  in GHCi.

  - Eval comments have access to the top-level bindings of the module they're

    defined in, including unexported bindings.

  - Multi-line eval comments are supported with `{- $> ... <$ -}`.

[ghcid]: https://github.com/ndmitchell/ghcid

[hpack]: https://github.com/sol/hpack

## Demo

Check out a quick demo to see how ghciwatch feels in practice:



## Learn More

[Read the manual here](https://mercurytechnologies.github.io/ghciwatch/).

## Developing ghciwatch

See [`CONTRIBUTING.md`](./CONTRIBUTING.md) for information on hacking

ghciwatch.