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Update documentation to reflect the module aware generator
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@ -24,7 +24,7 @@ Cobra provides:
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* Fully POSIX-compliant flags (including short & long versions)
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* Nested subcommands
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* Global, local and cascading flags
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* Easy generation of applications & commands with `cobra init appname` & `cobra add cmdname`
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* Easy generation of applications & commands with `cobra init` & `cobra add cmdname`
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* Intelligent suggestions (`app srver`... did you mean `app server`?)
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* Automatic help generation for commands and flags
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* Automatic help flag recognition of `-h`, `--help`, etc.
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@ -32,7 +32,7 @@ Cobra provides:
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* Automatically generated man pages for your application
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* Command aliases so you can change things without breaking them
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* The flexibility to define your own help, usage, etc.
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* Optional tight integration with [viper](http://github.com/spf13/viper) for 12-factor apps
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* Optional seamless integration with [viper](http://github.com/spf13/viper) for 12-factor apps
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# Concepts
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@ -32,7 +32,67 @@ func main() {
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Cobra provides its own program that will create your application and add any
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commands you want. It's the easiest way to incorporate Cobra into your application.
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[Here](https://github.com/spf13/cobra/blob/master/cobra/README.md) you can find more information about it.
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Install the cobra generator with the command `go install github.com/spf13/cobra/cobra`.
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Go will automatically install it in your $GOPATH/bin directory which should be in your $PATH.
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Once installed you should have the `cobra` command available. Confirm by typing `cobra` at a
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command line.
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There are only two operations currently supported by Cobra generator.
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### 1. Initializing a new project
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The Cobra generator works from within a Go module.
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If you haven't yet setup your project as a Go module:
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1. Create a new directory
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2. `cd` into that directory
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3. run `go mod init <MODNAME>`
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From within a Go module run `cobra init`. This will create a new barebones project
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for you to edit.
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You should be able to run you new application immediately. Try it with
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`go run main.go`.
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You will want to open up and edit 'cmd/root.go' and provide your own description and logic.
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#### Optional flags:
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You can provide it your author name with the `--author` flag.
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e.g. `cobra init --author "Steve Francia spf@spf13.com"`
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You can provide a license to use with `--license`
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e.g. `cobra init --license apache`
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Use the `--viper` flag to automatically setup [viper](https://github.com/spf13/viper)
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Viper is a companion to Cobra intended to provide easy handling of environment variables and config files
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and seamlessly connecting them to the application flags.
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### 2. Add a command to a project
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Once a cobra application is initialized you can continue to use cobra generator to
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add additional commands to your application. The command to do this is `cobra add`.
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As an example, if I was designing a todo application I would want to have my base `todo` command list the items.
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I would then add additional commands to display, create, mark complete and delete items.
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To add a command to an existing application, make sure you are in the directory with the main.go file and run:
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`cobra add <cmdname>`.
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#### Optional flags:
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`cobra add` supports all the same optional flags as `cobra init` does.
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Additionally you can provide a parent command for your new command. This defaults to rootCmd if not provided.
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If you want to place your command under a different command, just provide the name of the command.
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A todo is a bit too simple to really need a sub sub command. So let's use git as an example.
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If I wanted to create a new git stash command I would do the following:
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`cobra add stash`
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`cobra add pop --parent=stash`
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## Using the Cobra Library
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