cmdr

cmdr is a POSIX-compliant, command-line UI (CLI) library in Golang. It is a getopt-like parser of command-line options, be compatible with the getopt_long command line UI, which is an extension of the syntax recommended by POSIX.

We made many enhancements beyond the standard library flag.

There is a fully-functional Options Store (configurations) for your hierarchical configuration dataset too.

The .netCore version Cmdr.Core is available now. And, a cxx version cmdr-cxx was pre-released just now (Happy Spring Festival 2021).

See the image frames at #1.

See our extras:

• cmdr-docs: documentations (Working)
• cmdr-addons: a new daemon plugin dex for linux/macOS/windows.
• cmdr-examples: collects the samples for cmdr
• cmdr-go-starter: public template repo to new your cli app

and Bonus of #cmdr Series:

• dotnetCore: Cmdr.Core
• C++17 or higher: cmdr-cxx

News

• docs (WIP):

  • english documentation NOT completed yet
  • documentation at: https://hedzr.github.io/cmdr-docs/

• v1.10.36 (WIP)

  • _

• v1.10.35

  • fix nil exception while print error sometimes

• v1.10.33

  • routine maintenance release

• v1.10.32

  • fix: processing terminated too fast if global pre-actions return nil

• v1.10.31

  • routine maintenance release

• v1.10.30

  • routine maintenance release
  • add: examples/example-app
  • imp: use relative path in log output
  • reenable error template

• v1.10.29

  • routine maintenance release

• v1.10.27

  • upgrade to errors.v3

• v1.10.24

  • fix: version command, help screen not work

• v1.10.23

  • fix: unknown switch char not an error now
  • imp: refined gen zsh code, and gen shell codes
  • fea: support fish-shell completion generating now
  • fea: added root.RunAsSubCommand, treat 'app' as a synonym of 'app subcmd1 subcmd2'
  • imp/fix/fea: clarify the slice append or replace mode - SetNx & SetNxOverwrite for Option Store
  • fea: added VendorHidden field for when you wanna a never shown flag or command
  • fea: conf package - add Serial, SerialString for CI tool
  • imp: erase man1 folder after --man
  • fix/imp: prints description with color escaped, when multiline
  • fix: restore Match() but with new name MatchAndTest()
  • fix: high-order fn hold the older copy, so pass it by holding a pointer to original variable
  • imp: review most of the tests
  • NOTE: cleanup the deprecated codes [cmd.NewFlagV,cmd.NewFlag, cmd.NewSubCommand, ...]
  • fea: more completion supports

• v1.10.19

  • temporary build for earlier testing
  • confirmed: backward compatible with go1.12

• v1.10.13

  • fix/imp: adapt windir to *nix name to fit for generic config file loading
  • fea/imp: improved Aliases algor, support more tmpl var substitute
  • fix: fallback the unknown type as string type
  • fea: add flag to control whether write the changes back to alternative config file or not, WithAlterConfigAutoWriteBack
  • imp: name/desc fields of builtin commands and flags
  • CHANGE: use bgo build-tool now, Makefile thrown

• More details at CHANGELOG

Features

Features.md

Old README.md: README.old.md

For Developer

For Developer

Fast Guide

See example-app

Expand to source codes

package main

import (
	"fmt"
	"github.com/hedzr/cmdr"
	"github.com/hedzr/cmdr/examples/internal"
	"github.com/hedzr/cmdr/plugin/pprof"
	"github.com/hedzr/cmdr/tool"
	"github.com/hedzr/log"
	"github.com/hedzr/log/isdelve"
	"github.com/hedzr/logex/build"
	"gopkg.in/hedzr/errors.v3"
)

func main() {
	Entry()
}

func Entry() {
	root := buildRootCmd()
	if err := cmdr.Exec(root, options...); err != nil {
		log.Fatalf("error occurs in app running: %+v\n", err)
	}
}

func buildRootCmd() (rootCmd *cmdr.RootCommand) {
	root := cmdr.Root(appName, version).
		//AddGlobalPreAction(func(cmd *cmdr.Command, args []string) (err error) {
		//	// cmdr.Set("enable-ueh", true)
		//	return
		//}).
		//AddGlobalPreAction(func(cmd *cmdr.Command, args []string) (err error) {
		//	//fmt.Printf("# global pre-action 2, exe-path: %v\n", cmdr.GetExecutablePath())
		//	return
		//}).
		//AddGlobalPostAction(func(cmd *cmdr.Command, args []string) {
		//	//fmt.Println("# global post-action 1")
		//}).
		//AddGlobalPostAction(func(cmd *cmdr.Command, args []string) {
		//	//fmt.Println("# global post-action 2")
		//}).
		Copyright(copyright, "hedzr").
		Description(desc, longDesc).
		Examples(examples)
	rootCmd = root.RootCommand()

	// for your biz-logic, constructing an AttachToCmdr(root *cmdr.RootCmdOpt) is recommended.
	// see our full sample and template repo: https://github.com/hedzr/cmdr-go-starter
	//core.AttachToCmdr(root.RootCmdOpt())

	// These lines are removable

	cmdr.NewBool(false).
		Titles("enable-ueh", "ueh").
		Description("Enables the unhandled exception handler?").
		AttachTo(root)
	//cmdrPanic(root)
	cmdrSoundex(root)
	//pprof.AttachToCmdr(root.RootCmdOpt())
	return
}

func cmdrSoundex(root cmdr.OptCmd) {

	cmdr.NewSubCmd().Titles("soundex", "snd", "sndx", "sound").
		Description("soundex test").
		Group("Test").
		TailPlaceholder("[text1, text2, ...]").
		Action(func(cmd *cmdr.Command, args []string) (err error) {
			for ix, s := range args {
				fmt.Printf("%5d. %s => %s\n", ix, s, tool.Soundex(s))
			}
			return
		}).
		AttachTo(root)

}

func onUnhandledErrorHandler(err interface{}) {
	if cmdr.GetBoolR("enable-ueh") {
		dumpStacks()
	}

	panic(err) // re-throw it
}

func dumpStacks() {
	fmt.Printf("\n\n=== BEGIN goroutine stack dump ===\n%s\n=== END goroutine stack dump ===\n\n", errors.DumpStacksAsString(true))
}

func init() {
	options = append(options, cmdr.WithUnhandledErrorHandler(onUnhandledErrorHandler))

	options = append(options,
		cmdr.WithLogx(build.New(build.NewLoggerConfigWith(
			defaultDebugEnabled, defaultLoggerBackend, defaultLoggerLevel,
			log.WithTimestamp(true, "")))))

	options = append(options, cmdr.WithHelpTailLine(`
# Type '-h'/'-?' or '--help' to get command help screen.
# Star me if it's helpful: https://github.com/hedzr/cmdr/examples/example-app
`))

	if isDebugBuild() {
		options = append(options, pprof.GetCmdrProfilingOptions())
	}

	// enable '--trace' command line option to toggle a internal trace mode (can be retrieved by cmdr.GetTraceMode())
	// import "github.com/hedzr/cmdr-addons/pkg/plugins/trace"
	// trace.WithTraceEnable(defaultTraceEnabled)
	// Or:
	optAddTraceOption := cmdr.WithXrefBuildingHooks(func(root *cmdr.RootCommand, args []string) {
		cmdr.NewBool(false).
			Titles("trace", "tr").
			Description("enable trace mode for tcp/mqtt send/recv data dump", "").
			//Action(func(cmd *cmdr.Command, args []string) (err error) { println("trace mode on"); cmdr.SetTraceMode(true); return; }).
			Group(cmdr.SysMgmtGroup).
			AttachToRoot(root)
	}, nil)
	options = append(options, optAddTraceOption)
	//options = append(options, optAddServerExtOpt«ion)

	// allow and search '.<appname>.yml' at first
	locations := []string{".$APPNAME.yml"}
	locations = append(locations, cmdr.GetPredefinedLocations()...)
	options = append(options, cmdr.WithPredefinedLocations(locations...))

	options = append(options, internal.NewAppOption())
}

func isDebugBuild() bool { return isdelve.Enabled }

var options []cmdr.ExecOption

//goland:noinspection GoNameStartsWithPackageName
const (
	appName   = "example-app"
	version   = "0.2.5"
	copyright = "example-app - A devops tool - cmdr series"
	desc      = "example-app is an effective devops tool. It make an demo application for 'cmdr'"
	longDesc  = `example-app is an effective devops tool. It make an demo application for 'cmdr'.
`
	examples = `
$ {{.AppName}} gen shell [--bash|--zsh|--fish|--auto]
  generate bash/shell completion scripts
$ {{.AppName}} gen man
  generate linux man page 1
$ {{.AppName}} --help
  show help screen.
$ {{.AppName}} --help --man
  show help screen in manpage viewer (for linux/darwin).
`
	overview = ``

	zero = 0

	defaultTraceEnabled  = true
	defaultDebugEnabled  = false
	defaultLoggerLevel   = "debug"
	defaultLoggerBackend = "logrus"
)

About the Docker build

Here is a docker build for cmdr/examples/fluent so that you can run it without go building or downloading the release files:

# from Docker Hub:
$ docker run -it --rm hedzr/cmdr-fluent
$ docker run -it --rm hedzr/cmdr-fluent --help

# from Github Packages (please following the guide of GitHub Packages Site):
$ docker run -it --rm docker.pkg.github.com/hedzr/cmdr/cmdr-fluent
$ docker run -it --rm docker.pkg.github.com/hedzr/cmdr/cmdr-fluent --help

Examples

1. short
   simple codes with structured data style.

2. demo
   normal demo with external config files.

3. wget-demo
   partial-covered for GNU wget.

4. fluent
   demostrates how to define your command-ui with the fluent api style.

5. ffdemo

   a demo to show you how to migrate from go flag smoothly.

6. cmdr-http2
   http2 server with daemon supports, graceful shutdown

7. awesome-tool
   awesome-tool is a cli app that fetch the repo stars and generate a markdown summary, accordingly with most of awesome-xxx list in github (such as awesome-go).

See Also the examples index: Examples.md (zh-cn TODO: Examples.zh-cn.md)

Uses

• https://github.com/hedzr/consul-tags
• https://github.com/hedzr/ini-op
• https://github.com/hedzr/awesome-tool
• austr
• Issue me to adding yours

Contrib

Feel free to issue me bug reports and fixes. Many thanks to all contributors.

Thanks to JODL

Thanks to JetBrains for donating product licenses to help develop ** cmdr**

License

MIT