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Update for enabling cascading

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Bill Robbins 2015-02-06 15:00:04 -06:00
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commit 10178ad847
1 changed files with 18 additions and 2 deletions
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@ -1,4 +1,4 @@
viper [![Build Status](https://travis-ci.org/spf13/viper.svg)](https://travis-ci.org/spf13/viper) viper <!--[![Build Status](https://travis-ci.org/spf13/viper.svg)](https://travis-ci.org/spf13/viper)-->
===== =====
Go configuration with fangs Go configuration with fangs
@ -69,13 +69,29 @@ Examples:
If you want to support a config file, Viper requires a minimal If you want to support a config file, Viper requires a minimal
configuration so it knows where to look for the config file. Viper configuration so it knows where to look for the config file. Viper
supports yaml, toml and json files. Viper can search multiple paths, but supports yaml, toml and json files. Viper can search multiple paths, but
currently a single viper only supports a single config file. currently a single viper only supports a single config file, unless cascading is enabled.
viper.SetConfigName("config") // name of config file (without extension) viper.SetConfigName("config") // name of config file (without extension)
viper.AddConfigPath("/etc/appname/") // path to look for the config file in viper.AddConfigPath("/etc/appname/") // path to look for the config file in
viper.AddConfigPath("$HOME/.appname") // call multiple times to add many search paths viper.AddConfigPath("$HOME/.appname") // call multiple times to add many search paths
viper.ReadInConfig() // Find and read the config file viper.ReadInConfig() // Find and read the config file
#### Enabling Cascading
By default Viper stops reading configuration once it encounters the first available configuration file.
That means each configuration file must contain all configuration values you need.
By enabling cascading you can create sparse configuration files. Configuration will cascade down in
the order that files are added by AddConfigPath. For more see viper_test's cascading tests.
Consider:
* \etc\myapp\myapp.json
* (%GOPATH)\src\myapp\myapp.json
You can check in a default myapp.json for development and only override certain kvps in production
viper.EnableCascading(true)
### Setting Overrides ### Setting Overrides
These could be from a command line flag, or from your own application logic. These could be from a command line flag, or from your own application logic.