Utilities for making life with pflag easier

Example:

package main

import (
    flag "github.com/ogier/pflag"
    "github.com/alecthomas/flagutil"
)

var (
    debugFlag    = flag.Bool("debug", false, "enable debug mode")
    logLevelFlag = flag.Int("log_level", 0, "set the log level for stdout logging")
)

func main() {
    flag.Usage = flagutil.MakeUsage("usage: test <flags>\n\nA test application.", "")
    flag.Parse()
}

Then calling --help results in the following:

$ test --help
usage: test <flags>

A test application.

  --debug=false   enable debug mode
  --log_level=0   set the log level for stdout logging

API Documentation

import "github.com/alecthomas/flagutil"

Usage

func MakeUsage

func MakeUsage(prefix, postfix string) func()

MakeUsage creates a function that generates nicely formatted usage text, usable as "flag.Usage".

func ParseFlagsFromJSON

func ParseFlagsFromJSON(r io.Reader, flags *flag.FlagSet) error

ParseFlagsFromJSON parses values from a JSON stream into a FlagSet. Keys in the JSON file that do not correspond to flags will result in an error.

func ParseFlagsFromMap

func ParseFlagsFromMap(data map[string]interface{}, flags *flag.FlagSet) error

ParseFlagsFromMap loads flag values from a map[string]interface{} into a FlagSet. Keys in the JSON file that do not correspond to flags will result in an error.

func PrettyFormatFlags

func PrettyFormatFlags(w io.Writer, flags *flag.FlagSet)

PrettyFormatFlags formats standard Go flag FlagSets in a way that doesn't make your eyes bleed.