TOML stands for Tom's Obvious, Minimal Language.
Spec: https://github.com/mojombo/toml
Compatible with TOML version v0.1.0
Documentation: http://godoc.org/github.com/BurntSushi/toml
Installation:
go get github.com/BurntSushi/toml
Try the toml validator:
go get github.com/BurntSushi/toml/tomlv
tomlv some-toml-file.toml
This package works similarly to how the Go standard library handles XML
and JSON
. Namely, data is loaded into Go values via reflection.
For the simplest example, consider some TOML file as just a list of keys and values:
Age = 25
Cats = [ "Cauchy", "Plato" ]
Pi = 3.14
Perfection = [ 6, 28, 496, 8128 ]
DOB = 1987-07-05T05:45:00Z
Which could be defined in Go as:
type Config struct {
Age int
Cats []string
Pi float64
Perfection []int
DOB time.Time // requires `import time`
}
And then decoded with:
var conf Config
if err := toml.Decode(tomlData, &conf); err != nil {
// handle error
}
You can also use struct tags if your struct field name doesn't map to a TOML key value directly:
some_key_NAME = "wat"
type TOML struct {
ObscureKey string `toml:"some_key_NAME"`
}
Here's an example of how to load the example from the official spec page:
# This is a TOML document. Boom.
title = "TOML Example"
[owner]
name = "Tom Preston-Werner"
organization = "GitHub"
bio = "GitHub Cofounder & CEO\nLikes tater tots and beer."
dob = 1979-05-27T07:32:00Z # First class dates? Why not?
[database]
server = "192.168.1.1"
ports = [ 8001, 8001, 8002 ]
connection_max = 5000
enabled = true
[servers]
# You can indent as you please. Tabs or spaces. TOML don't care.
[servers.alpha]
ip = "10.0.0.1"
dc = "eqdc10"
[servers.beta]
ip = "10.0.0.2"
dc = "eqdc10"
[clients]
data = [ ["gamma", "delta"], [1, 2] ] # just an update to make sure parsers support it
# Line breaks are OK when inside arrays
hosts = [
"alpha",
"omega"
]
And the corresponding Go types are:
type tomlConfig struct {
Title string
Owner ownerInfo
DB database `toml:"database"`
Servers map[string]server
Clients clients
}
type ownerInfo struct {
Name string
Org string `toml:"organization"`
Bio string
DOB time.Time
}
type database struct {
Server string
Ports []int
ConnMax int `toml:"connection_max"`
Enabled bool
}
type server struct {
IP string
DC string
}
type clients struct {
Data [][]interface{}
Hosts []string
}
Note that a case insensitive match will be tried if an exact match can't be found.
A working example of the above can be found in _examples/example.{go,toml}
.