https://github.com/tek/exon

Customizable Quasiquote Interpolation
https://github.com/tek/exon

haskell quasiquotes string-interpolation

Last synced: about 2 months ago
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Customizable Quasiquote Interpolation

• Host: GitHub
• URL: https://github.com/tek/exon
• Owner: tek
• Created: 2021-07-03T21:44:09.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2024-11-06T21:54:09.000Z (2 months ago)
• Last Synced: 2024-11-06T22:35:17.682Z (2 months ago)
• Topics: haskell, quasiquotes, string-interpolation
• Language: Nix
• Homepage:
• Size: 157 KB
• Stars: 6
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
This Haskell library provides string interpolation in quasiquotes, allowing you to build strings like this:

```haskell

animal = "snake"

location = "a tree"

[exon|#{animal} in #{location}|]

-- "snake in a tree"

```

Please consult [hackage] for the full documentation.

Each step of the process is customizable based on the result type of the quote, making it possible to construct strings

for arbitrary types.

For example, `String -> String` is the type used by `showsPrec`, which can be a bit of a hassle to write:

```haskell

data Record =

  Record {

    number :: Int,

    maybeNumber :: Maybe Int,

    value :: Value

  }

instance Show Record where

  showsPrec d Record {..} =

    showParen (d > 10) [exon|Record #{showsPrec 11 number} #{showsPrec 11 maybeNumber} #{showsPrec 11 value}|]

```

[hackage]: https://hackage.haskell.org/package/exon/docs/Exon.html