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https://github.com/desertbit/grumble
A powerful modern CLI and SHELL
https://github.com/desertbit/grumble
cli flags golang shell
Last synced: about 2 months ago
JSON representation
A powerful modern CLI and SHELL
- Host: GitHub
- URL: https://github.com/desertbit/grumble
- Owner: desertbit
- License: mit
- Created: 2018-01-02T18:13:57.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2024-07-25T06:42:29.000Z (about 2 months ago)
- Last Synced: 2024-07-25T07:55:30.029Z (about 2 months ago)
- Topics: cli, flags, golang, shell
- Language: Go
- Size: 64.5 KB
- Stars: 523
- Watchers: 14
- Forks: 56
- Open Issues: 17
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Authors: AUTHORS
Awesome Lists containing this project
- awesome-go - Grumble - powerful modern CLI and SHELL (CLI frameworks)
- awesome-hacking-lists - desertbit/grumble - A powerful modern CLI and SHELL (Go)
README
# Grumble - A powerful modern CLI and SHELL
[](https://godoc.org/github.com/desertbit/grumble)
[](https://goreportcard.com/report/github.com/desertbit/grumble)
There are a handful of powerful go CLI libraries available ([spf13/cobra](https://github.com/spf13/cobra), [urfave/cli](https://github.com/urfave/cli)).
However sometimes an integrated shell interface is a great and useful extension for the actual application.
This library offers a simple API to create powerful CLI applications and automatically starts
an **integrated interactive shell**, if the application is started without any command arguments.
**Hint:** We do not guarantee 100% backwards compatiblity between minor versions (1.x). However, the API is mostly stable and should not change much.
[](https://asciinema.org/a/155332?t=5)
## Introduction
Create a grumble APP.
```go
var app = grumble.New(&grumble.Config{
Name: "app",
Description: "short app description",
Flags: func(f *grumble.Flags) {
f.String("d", "directory", "DEFAULT", "set an alternative directory path")
f.Bool("v", "verbose", false, "enable verbose mode")
},
})
```
Register a top-level command. *Note: Sub commands are also supported...*
```go
app.AddCommand(&grumble.Command{
Name: "daemon",
Help: "run the daemon",
Aliases: []string{"run"},
Flags: func(f *grumble.Flags) {
f.Duration("t", "timeout", time.Second, "timeout duration")
},
Args: func(a *grumble.Args) {
a.String("service", "which service to start", grumble.Default("server"))
},
Run: func(c *grumble.Context) error {
// Parent Flags.
c.App.Println("directory:", c.Flags.String("directory"))
c.App.Println("verbose:", c.Flags.Bool("verbose"))
// Flags.
c.App.Println("timeout:", c.Flags.Duration("timeout"))
// Args.
c.App.Println("service:", c.Args.String("service"))
return nil
},
})
```
Run the application.
```go
err := app.Run()
```
Or use the builtin *grumble.Main* function to handle errors automatically.
```go
func main() {
grumble.Main(app)
}
```
## Shell Multiline Input
Builtin support for multiple lines.
```
>>> This is \
... a multi line \
... command
```
## Separate flags and args specifically
If you need to pass a flag-like value as positional argument, you can do so by using a double dash:
`>>> command --flag1=something -- --myPositionalArg`
## Remote shell access with readline
By calling RunWithReadline() rather than Run() you can pass instance of readline.Instance.
One of interesting usages is having a possibility of remote access to your shell:
```go
handleFunc := func(rl *readline.Instance) {
var app = grumble.New(&grumble.Config{
// override default interrupt handler to avoid remote shutdown
InterruptHandler: func(a *grumble.App, count int) {
// do nothing
},
// your usual grumble configuration
})
// add commands
app.RunWithReadline(rl)
}
cfg := &readline.Config{}
readline.ListenRemote("tcp", ":5555", cfg, handleFunc)
```
In the client code just use readline built in DialRemote function:
```go
if err := readline.DialRemote("tcp", ":5555"); err != nil {
fmt.Errorf("An error occurred: %s \n", err.Error())
}
```
## Samples
Check out the [sample directory](/sample) for some detailed examples.
## Projects using Grumble
- grml - A simple build automation tool written in Go: https://github.com/desertbit/grml
- orbit - A RPC-like networking backend written in Go: https://github.com/desertbit/orbit
## Known issues
- Windows unicode not fully supported ([issue](https://github.com/desertbit/grumble/issues/48))
## Additional Useful Packages
- https://github.com/AlecAivazis/survey
- https://github.com/tj/go-spin
## Credits
This project is based on ideas from the great [ishell](https://github.com/abiosoft/ishell) library.
## License
MIT