dhall-golang

Go bindings for the dhall configuration language.

Quick start

Here's a minimal example of how you might use dhall-golang to load a Dhall file into your own struct:

package main

import (
	"fmt"

	"github.com/philandstuff/dhall-golang/v6"
)

// Config can be a fairly arbitrary Go datatype.  You would put your
// application configuration in this struct.
type Config struct {
	Port int
	Name string
}

func main() {
	var config Config
	err = dhall.UnmarshalFile("/path/to/config.dhall", &config)
	if err != nil {
		panic(err)
	}
	fmt.Printf("Loaded config: %#v\n", config)
}

Documentation

You can find more documentation in the dhall-golang godoc.

Development

This is a fairly standard Go project. It uses go modules, so no vendoring of dependencies is required.

Running the tests

git submodule update --init --recursive

go test ./...

go test -short ./... # skips long-running tests

Making changes to the PEG grammar

Dhall-golang uses pigeon to generate the parser source file parser/internal/dhall.go from the PEG grammar at parser/internal/dhall.peg. If you change the PEG grammar, you need to first install the pigeon binary if you don't already have it:

# either outside a module directory, or with GO111MODULE=off
go get github.com/mna/pigeon

Then, to regenerate the parser:

go generate ./parser

Support

Issues and pull requests are welcome on this repository. If you have a question, you can ask it on the Dhall discourse.