✨Binding configuration and command flag made easy!✨

You can use multiple keys tag to simplify the look like this (supported feature**):

// single tag key
type MyConfig struct {
    Token string `json:"token_json" xml:"token_xml" arg:"token" env:"token" environ:"TOKEN"`
}
// multiple tag keys
type MyConfig struct {
    Token string `json xml bson yaml toml arg env:"token" environ:"TOKEN"`
}

Below is default mapping implementation of binder.RegisterCmdArgs = defaultRegisterCmdArgsFlagStd that use standard golang flag package to perform command flag.

The <parent> is a placeholder for parent key, binder.BindArgs(Loaded, "my") this case <parent> will be replaced with my, if there's field with type struct in the component, it'll be replaced to my.<struct name | arg value>.<field name | arg>

Tag	Go Code	Description
arg:"token"	flag.StringVar(val, "<parent>.token", *val, argUsage)	Used for binding flag with contextual key <parent>
argx:"token"	flag.StringVar(val, "token", *val, argUsage)	Used for binding flag
bind:"log"	No equivalent	Used for binder to differ struct parent sub context <parent>.log.<field name>
env:"token"	os.Getenv("<parent>.token")	Used for binding to environment variable with contextual key <parent>
environ:"token"	os.Getenv("token")	Used for binding to environment
usage:"<DESC>"	Used as argUsage	Description for flag
ignore:"true"	No equivalent	Ignore struct field
bind:"abc"	No equivalent	Used for mapstructure (bind is default value of binder.TagName)

Other:

• arg and argx (dedicated) basically has same function.
• env and environ (dedicated) basically has same function.
• Currently you can't have dedicated key for configuration because the way it parsed is from Unmarshaller that results in map[string]interface{}, but this definitely possible to implement.

More thing you can learn from the example below.

Example

See more on example directory.

$ ./main -h
Filename "config.json" ext ".json"
Usage of ./main:
  -dedicatedArg string
    
  -my.Ktes int
    
  -my.Sub.Hello string
    
  -my.Sub.PtrOfSub.YourName string
        this is the usage
  -my.Sub.SubOfSub.InSub
    
  -my.count int
        this is the usage (default 121)
  -my.log.Directory string
    
  -my.log.SubLog int
    
  -my.log.filename string
    
  -my.mycount int
        this is the usage mycount
  -my.mystring string
        this is the usage mystring
  -my.stringslice value
        a string slice arg
  -my.token string
         (default "some default value")

Note

Contributions are welcome

**) Reverted feature as from 1.16 but found it useful

License