Update documentation to reflect the module aware generator

This commit is contained in:
Steve Francia 2021-07-01 18:22:36 -04:00
parent 9388e79fb4
commit c97b7ece0b
2 changed files with 63 additions and 3 deletions

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@ -24,7 +24,7 @@ Cobra provides:
* Fully POSIX-compliant flags (including short & long versions)
* Nested subcommands
* Global, local and cascading flags
* Easy generation of applications & commands with `cobra init appname` & `cobra add cmdname`
* Easy generation of applications & commands with `cobra init` & `cobra add cmdname`
* Intelligent suggestions (`app srver`... did you mean `app server`?)
* Automatic help generation for commands and flags
* Automatic help flag recognition of `-h`, `--help`, etc.
@ -32,7 +32,7 @@ Cobra provides:
* Automatically generated man pages for your application
* Command aliases so you can change things without breaking them
* The flexibility to define your own help, usage, etc.
* Optional tight integration with [viper](http://github.com/spf13/viper) for 12-factor apps
* Optional seamless integration with [viper](http://github.com/spf13/viper) for 12-factor apps
# Concepts

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@ -32,7 +32,67 @@ func main() {
Cobra provides its own program that will create your application and add any
commands you want. It's the easiest way to incorporate Cobra into your application.
[Here](https://github.com/spf13/cobra/blob/master/cobra/README.md) you can find more information about it.
Install the cobra generator with the command `go install github.com/spf13/cobra/cobra`.
Go will automatically install it in your $GOPATH/bin directory which should be in your $PATH.
Once installed you should have the `cobra` command available. Confirm by typing `cobra` at a
command line.
There are only two operations currently supported by Cobra generator.
### 1. Initializing a new project
The Cobra generator works from within a Go module.
If you haven't yet setup your project as a Go module:
1. Create a new directory
2. `cd` into that directory
3. run `go mod init <MODNAME>`
From within a Go module run `cobra init`. This will create a new barebones project
for you to edit.
You should be able to run you new application immediately. Try it with
`go run main.go`.
You will want to open up and edit 'cmd/root.go' and provide your own description and logic.
#### Optional flags:
You can provide it your author name with the `--author` flag.
e.g. `cobra init --author "Steve Francia spf@spf13.com"`
You can provide a license to use with `--license`
e.g. `cobra init --license apache`
Use the `--viper` flag to automatically setup [viper](https://github.com/spf13/viper)
Viper is a companion to Cobra intended to provide easy handling of environment variables and config files
and seamlessly connecting them to the application flags.
### 2. Add a command to a project
Once a cobra application is initialized you can continue to use cobra generator to
add additional commands to your application. The command to do this is `cobra add`.
As an example, if I was designing a todo application I would want to have my base `todo` command list the items.
I would then add additional commands to display, create, mark complete and delete items.
To add a command to an existing application, make sure you are in the directory with the main.go file and run:
`cobra add <cmdname>`.
#### Optional flags:
`cobra add` supports all the same optional flags as `cobra init` does.
Additionally you can provide a parent command for your new command. This defaults to rootCmd if not provided.
If you want to place your command under a different command, just provide the name of the command.
A todo is a bit too simple to really need a sub sub command. So let's use git as an example.
If I wanted to create a new git stash command I would do the following:
`cobra add stash`
`cobra add pop --parent=stash`
## Using the Cobra Library