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conflag is a drop-in replacement for Go's standard flag package with config file support.
Usage
Your code:
package main
import (
"fmt""github.com/nadoo/conflag"
)
varconfstruct {
NamestringAgeintMalebool
}
funcmain() {
// get a new conflag instanceflag:=conflag.New()
// setup flags as the standard flag packageflag.StringVar(&conf.Name, "name", "", "your name")
flag.IntVar(&conf.Age, "age", 0, "your age")
flag.BoolVar(&conf.Male, "male", false, "your sex")
// parse before access flagsflag.Parse()
// now you're able to get the parsed flag valuesfmt.Printf(" Name: %s\n", conf.Name)
fmt.Printf(" Age: %d\n", conf.Age)
fmt.Printf(" Male: %v\n", conf.Male)
}
Run without config file:
command:
example -name Jay -age 30
output:
Name: Jay
Age: 30
Male: false
Run with config file and environment variable(-config):
example.conf:
name={$NAME}
age=20
male
command: use "-config" flag to specify the config file path.
NAME=Jason example -config example.conf
output:
Name: Jason
Age: 20
Male: true
Run with config file and OVERRIDE a flag value using commandline:
example.conf:
name=Jason
age=20
male
command:
example -config example.conf -name Michael
output:
Name: Michael
Age: 20
Male: true
Config File
format: KEY=VALUE
just use the command line flag name as key name:
## config file# comment line starts with "#"# format:#KEY=VALUE, # just use the command line flag name as key name# use {$ENV_VAR_NAME} in VALUE to get the Environment Variable value# your name
name={$NAME}
# your age
age=20
# are you male?
male=true
# use include to include more config files
include=part1.inc.conf
include=part2.inc.conf
