Dhall - Data notation

home terminal edit

Dhall is a data notation created in 2017.

#133on PLDB

7Years Old

817Repos

Download source code:

git clone https://github.com/dhall-lang/dhall-lang

Homepage · REPL · Source Code · Twitter

Maintainable configuration files

Tags: dataNotation
Dhall is developed on GitHub and has 4,185 stars
There are at least 817 Dhall repos on GitHub
Early development of Dhall happened in https://github.com/dhall-lang
Dhall is written in Dhall, Markdown, Nix, Haskell, SVG, Bourne shell, HTML, Diff, JSON, CSS, Python, JavaScript, YAML
The Google BigQuery Public Dataset GitHub snapshot shows 46 users using Dhall in 60 repos on GitHub
6 PLDB concepts link to Dhall: cloc, Dhall, lamdu-editor, Lamdu, mal, PureScript

Example from the web:

-- ./company.dhall

let Prelude =
      https://prelude.dhall-lang.org/v19.0.0/package.dhall sha256:eb693342eb769f782174157eba9b5924cf8ac6793897fc36a31ccbd6f56dafe2

let companyName = "Example Dot Com"

let User = { name : Text, account : Text, age : Natural }

let users
    : List User
    = [ { name = "John Doe", account = "john", age = 23 }
      , { name = "Jane Smith", account = "jane", age = 29 }
      , { name = "William Allen", account = "bill", age = 41 }
      ]

let toEmail = \(user : User) -> "${user.account}@example.com"

let Bio = { name : Text, age : Natural }

let toBio = \(user : User) -> user.(Bio)

let companySize = Prelude.List.length User users

let greetingPage =
      ''
      <html>
      <title>Welcome to ${companyName}!</title>
      <body>
      <p>Welcome to our humble company of ${Natural/show companySize} people!</p>
      </body>
      </html>
        ''

in  { emails = Prelude.List.map User Text toEmail users
    , bios = Prelude.List.map User Bio toBio users
    , greetingPage = greetingPage
    }

Example from Riju:

{ output = "Hello, world!" }

Language features

Feature	Supported	Example	Token
Comments	✓	-- A comment
Line Comments	✓	-- A comment	--
Semantic Indentation	X