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## Introduction ## Introduction
**config** is a simple golang library and designed to read configurations from JSON, Yaml files, environment variables and command line. **config** depends on [go-yaml](https://github.com/go-yaml/yaml) to anlayze Yaml file and use built-in JSON library to handle JSON file. **config** is a simple golang library and designed to read configurations from JSON, Yaml files, environment variables and command line. **config** depends on [go-yaml](https://github.com/go-yaml/yaml) to anlayze Yaml file and use built-in golang library to handle JSON file.
## Installation ## Installation
1. Install [Yaml](https://github.com/go-yaml/yaml) library first: 1. Install [Yaml](https://github.com/go-yaml/yaml) library first:
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go get gopkg.in/yaml.v2 go get gopkg.in/yaml.v2
``` ```
2. Run the below to install: 2. Install **config** library:
``` ```
go get github.com/eschao/config go get github.com/eschao/config
``` ```
## Usage ## Usage
#### Defines **default** values
**config** library supports defining a default value for structure members by using **default** keyword in structure tags
```golang
type Database struct {
Username string `default:"admin"`
Password string `default:"admin"`
}
```
After specified default value in tags, calls ```config.ParseDefault(interface{})``` to set it on structure instance, example codes as the below:
```golang
dbConfig := Database{}
config.ParseDefault(&dbConfig)
```