hofstadter-io / hofmod-cli

Hofstadter generator for Golang CLIs

hofmod-cli

A hof generator for creating advanced Golang CLIs.

Design your CLI structure, arguments, flags, and a whole host of addons and then generate the implementation. Changed your mind about what your CLI should look like? Redesign, regenerate, and keep adding you custom code.

Features:

• Quickly architect your CLI commands, arguments, flags, configuration
• Built on the fantastic [spf13/cobra](https://github.com/ andspf13/cobra)library for Golang CLIs
• Cross-platform builds and releases using GoReleaser, GitHub, and Docker
• Supports config files in local project falling back to OS specific application dir
• Your CLI will self check for updates and can self install with a user command
• Shell auto completion for bash, fish, zsh, and power shell
• Advanced help system with support for custom overviews, extra topics, and examples
• Telemetry systems which can hook up to Google Analytics
• Golang pprof and many other ENV VARs to control inner behavior

Sites to see:

• Schema - the design spec your write a CLI in
• Generator - hof generator definition you invoke
• Templates and partials - files which implement the code
• Example - the hof tool leverages and powers this, see the hof.cue and design directory for relevant files

Usage

You'll need the hof tool installed. You can download hof from the releases page.

Let's start a new project:

# Start a project
hof init github.com/verdverm/my-cli
cd my-cli

Add the following to the cue.mods file (same format as go.mod)

module github.com/verdverm/my-cli

cue master

require (
    github.com/hofstadter-io/hofmod-cli v0.7.0
)

To fetch the module, run:

hof mod vendor cue

# and after the next file, run
hof gen

Create a file named cli.cue and add the following content:

package cli

import (
	"github.com/hofstadter-io/hofmod-cli/schema"

	"github.com/hofstadter-io/hof/design/cli/cmds"
)

# Typically we put the cli under a nested directory
#Outdir: "./cmd/hof"

#CLI: schema.#Cli & {
    # Name and package path (matches outdir)
	Name:    "hof"
	Package: "github.com/hofstadter-io/hof/cmd/hof"

    # Usage and help
	Usage:      "hof"
	Short:      "Polyglot Development Tool and Framework"
	Long:       Short
	CustomHelp: #RootCustomHelp

    # Print the help when no subcommands are supplied
	OmitRun: true

    # Command stage hooks
	PersistentPrerun:     true
    # You can write code here or...
	PersistentPrerunBody: "runtime.Init()"
 
	PersistentPostrun: true
    # ...or add custom code right in the output

    # Persistent flags work for all subcommands too
    Pflags: [{
		Name:    "labels"
		Long:    "label"
		Short:   "l"
		Type:    "[]string"
		Default: "nil"
		Help:    "Labels for use across all commands"
	}, {
		Name:    "config"
		Long:    "config"
		Short:   ""
		Type:    "string"
		Default: ""
		Help:    "Path to a hof configuration file"
	}, ...]

    # Subcommands and nested down as far as you need
	Commands: [

	]

	//
	// Addons
	//
	Releases: #CliReleases
	Updates:  true

    ...
}

(this was adapted from the [hof](https://github.com/hofstadter-io/hof t) tool)

Now run hof gen to generate your code. Try adding implementation, and then build:

go build -o my-cli cmd/my-cli/main.go

./my-cli

Update your designs, rerun hof gen, rebuild and keep iterating away!