cli

Package cli wraps the standard flag package for a cleaner command line interface.

Installing

1. Get package:

   go get -u github.com/gowww/cli

2. Import it in your code:

   import "github.com/gowww/cli"

Usage

Henceforth, by "command" we mean "subcommand" (like the build part in go build)…

The order in which you define commands and flags is important!
When you define a main flag, it will be added to the top-level flag set but also to all commands already defined.

Obviously, each command can also define its own flags.

For the sake of clarity for the developer and ease of use for the final user, the usage pattern is simple and always the same : program [command] [flags]. No flags before command, and no commands of commands.

Example

package main

import "github.com/gowww/cli"

var (
	flagForMain    string // Flag "-m"
	flagForCommand string // Flag "-c"
	flagForAll     string // Flag "-a"
)

func main() {
	cli.SetUsageText("Command line interface example.")

	cli.String(&flagForMain, "m", "", "Example flag for main function.")

	cli.Command("command", command, "Example command.").
		String(&flagForCommand, "c", "", `Example flag for this command only.`)

	cli.String(&flagForAll, "a", "", "Example flag for main function and all commands defined previously.")

	cli.Parse()
}

func command() {
	// Do the command job.
}

Usage output

For example -help

Command line interface example.

Usage:

	example [command] [flags]

Commands:

	command  Example command.

Flags:

	-a  Example flag for main function and all commands defined previously.
	-m  Example flag for main function.

For example command -help

Example command.

Usage:

	example command [flags]

Flags:

	-a  Example flag for main function and all commands defined previously.
	-c  Example flag for this command only.