# go-toml

Go library for the [TOML](https://github.com/mojombo/toml) format.

This library supports TOML version
[v0.4.0](https://github.com/toml-lang/toml/blob/master/versions/en/toml-v0.4.0.md)

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## Features

Go-toml provides the following features for using data parsed from TOML documents:

* Load TOML documents from files and string data
* Easily navigate TOML structure using TomlTree
* Line & column position data for all parsed elements
* Query support similar to JSON-Path
* Syntax errors contain line and column numbers

Go-toml is designed to help cover use-cases not covered by reflection-based TOML parsing:

* Semantic evaluation of parsed TOML
* Informing a user of mistakes in the source document, after it has been parsed
* Programatic handling of default values on a case-by-case basis
* Using a TOML document as a flexible data-store

## Import

    import "github.com/pelletier/go-toml"

## Usage

### Example

Say you have a TOML file that looks like this:

```toml
[postgres]
user = "pelletier"
password = "mypassword"
```

Read the username and password like this:

```go
import (
    "fmt"
    "github.com/pelletier/go-toml"
)

config, err := toml.LoadFile("config.toml")
if err != nil {
    fmt.Println("Error ", err.Error())
} else {
    // retrieve data directly
    user := config.Get("postgres.user").(string)
    password := config.Get("postgres.password").(string)

    // or using an intermediate object
    configTree := config.Get("postgres").(*toml.TomlTree)
    user = configTree.Get("user").(string)
    password = configTree.Get("password").(string)
    fmt.Println("User is ", user, ". Password is ", password)

    // show where elements are in the file
    fmt.Println("User position: %v", configTree.GetPosition("user"))
    fmt.Println("Password position: %v", configTree.GetPosition("password"))

    // use a query to gather elements without walking the tree
    results, _ := config.Query("$..[user,password]")
    for ii, item := range results.Values() {
      fmt.Println("Query result %d: %v", ii, item)
    }
}
```

## Documentation

The documentation and additional examples are available at
[godoc.org](http://godoc.org/github.com/pelletier/go-toml).

## Tools

Go-toml provides two handy command line tools:

* `tomll`: Reads TOML files and lint them.

    ```
    go install github.com/pelletier/go-toml/cmd/tomll
    tomll --help
    ```
* `tomljson`: Reads a TOML file and outputs its JSON representation.

    ```
    go install github.com/pelletier/go-toml/cmd/tomjson
    tomljson --help
    ```

## Contribute

Feel free to report bugs and patches using GitHub's pull requests system on
[pelletier/go-toml](https://github.com/pelletier/go-toml). Any feedback would be
much appreciated!

### Run tests

You have to make sure two kind of tests run:

1. The Go unit tests
2. The TOML examples base

You can run both of them using `./test.sh`.

## License

The MIT License (MIT). Read [LICENSE](LICENSE).
