Package flagconf wraps the standard golang package flag. It intercepts it and preloads configuration values from local files (home-directory, /etc) and environment variables in order to retrieve default values. The resulting order of flag loading is:

1. in-code values (defaults provided in flagset, which is usually defined in the init function)
2. local file list (default is "~/.falgconf/.yaml")
3. environment variables
4. command line arguments

package main

import (
	"github.com/sebkl/flagconf"
	"flag"
)

var val *string
func init() {
	val = flag.String("val","defaultvalue","This is my application flag."
}

func main() {
	// The file "~/.flagconf/MYAPP.yml" and
	// all environemnt variables starting with "MYAPP"
	// are being evaluated for a flag value named "val"
	// If found the default value "defaultvalue" is overwritten.
	flagconf.Parse("MYAPP")

	/* ... code ... */
}

• Json encoded configuration files instead of yaml.
• Provide an ordered list of files to look for flag values by the FileList function.

Please find documentation at godoc.org/github.com/sebkl/flagconf.

Pleas feel free to send in Pull request. I want to make this a more comprehensive library for dealing with command line flags.