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diff --git a/vendor/github.com/spf13/cobra/README.md b/vendor/github.com/spf13/cobra/README.md index 9d7993426..3cf1b25d8 100644 --- a/vendor/github.com/spf13/cobra/README.md +++ b/vendor/github.com/spf13/cobra/README.md @@ -2,35 +2,14 @@ Cobra is both a library for creating powerful modern CLI applications as well as a program to generate applications and command files. -Many of the most widely used Go projects are built using Cobra, such as: -[Kubernetes](http://kubernetes.io/), -[Hugo](http://gohugo.io), -[rkt](https://github.com/coreos/rkt), -[etcd](https://github.com/coreos/etcd), -[Moby (former Docker)](https://github.com/moby/moby), -[Docker (distribution)](https://github.com/docker/distribution), -[OpenShift](https://www.openshift.com/), -[Delve](https://github.com/derekparker/delve), -[GopherJS](http://www.gopherjs.org/), -[CockroachDB](http://www.cockroachlabs.com/), -[Bleve](http://www.blevesearch.com/), -[ProjectAtomic (enterprise)](http://www.projectatomic.io/), -[Giant Swarm's gsctl](https://github.com/giantswarm/gsctl), -[Nanobox](https://github.com/nanobox-io/nanobox)/[Nanopack](https://github.com/nanopack), -[rclone](http://rclone.org/), -[nehm](https://github.com/bogem/nehm), -[Pouch](https://github.com/alibaba/pouch), -[Istio](https://istio.io), -[Prototool](https://github.com/uber/prototool), -[mattermost-server](https://github.com/mattermost/mattermost-server), -[Gardener](https://github.com/gardener/gardenctl), -[Linkerd](https://linkerd.io/), -[Github CLI](https://github.com/cli/cli) -etc. +Cobra is used in many Go projects such as [Kubernetes](http://kubernetes.io/), +[Hugo](https://gohugo.io), and [Github CLI](https://github.com/cli/cli) to +name a few. [This list](./projects_using_cobra.md) contains a more extensive list of projects using Cobra. [](https://travis-ci.org/spf13/cobra) [](https://godoc.org/github.com/spf13/cobra) [](https://goreportcard.com/report/github.com/spf13/cobra) +[](https://gophers.slack.com/archives/CD3LP1199) # Table of Contents @@ -50,9 +29,8 @@ etc. * [PreRun and PostRun Hooks](#prerun-and-postrun-hooks) * [Suggestions when "unknown command" happens](#suggestions-when-unknown-command-happens) * [Generating documentation for your command](#generating-documentation-for-your-command) - * [Generating bash completions](#generating-bash-completions) - * [Generating zsh completions](#generating-zsh-completions) -- [Contributing](#contributing) + * [Generating shell completions](#generating-shell-completions) +- [Contributing](CONTRIBUTING.md) - [License](#license) # Overview @@ -72,7 +50,7 @@ Cobra provides: * Intelligent suggestions (`app srver`... did you mean `app server`?) * Automatic help generation for commands and flags * Automatic help flag recognition of `-h`, `--help`, etc. -* Automatically generated bash autocomplete for your application +* Automatically generated shell autocomplete for your application (bash, zsh, fish, powershell) * 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. @@ -130,7 +108,7 @@ Using Cobra is easy. First, use `go get` to install the latest version of the library. This command will install the `cobra` generator executable along with the library and its dependencies: - go get -u github.com/spf13/cobra/cobra + go get -u github.com/spf13/cobra Next, include Cobra in your application: @@ -199,7 +177,7 @@ var rootCmd = &cobra.Command{ func Execute() { if err := rootCmd.Execute(); err != nil { - fmt.Println(err) + fmt.Fprintln(os.Stderr, err) os.Exit(1) } } @@ -335,6 +313,37 @@ var versionCmd = &cobra.Command{ } ``` +### Returning and handling errors + +If you wish to return an error to the caller of a command, `RunE` can be used. + +```go +package cmd + +import ( + "fmt" + + "github.com/spf13/cobra" +) + +func init() { + rootCmd.AddCommand(tryCmd) +} + +var tryCmd = &cobra.Command{ + Use: "try", + Short: "Try and possibly fail at something", + RunE: func(cmd *cobra.Command, args []string) error { + if err := someFunc(); err != nil { + return err + } + return nil + }, +} +``` + +The error can then be caught at the execute function call. + ## Working with Flags Flags provide modifiers to control how the action command operates. @@ -410,6 +419,12 @@ rootCmd.Flags().StringVarP(&Region, "region", "r", "", "AWS region (required)") rootCmd.MarkFlagRequired("region") ``` +Or, for persistent flags: +```go +rootCmd.PersistentFlags().StringVarP(&Region, "region", "r", "", "AWS region (required)") +rootCmd.MarkPersistentFlagRequired("region") +``` + ## Positional and Custom Arguments Validation of positional arguments can be specified using the `Args` field @@ -740,30 +755,11 @@ Run 'kubectl help' for usage. ## Generating documentation for your command -Cobra can generate documentation based on subcommands, flags, etc. in the following formats: - -- [Markdown](doc/md_docs.md) -- [ReStructured Text](doc/rest_docs.md) -- [Man Page](doc/man_docs.md) - -## Generating bash completions - -Cobra can generate a bash-completion file. If you add more information to your command, these completions can be amazingly powerful and flexible. Read more about it in [Bash Completions](bash_completions.md). - -## Generating zsh completions - -Cobra can generate zsh-completion file. Read more about it in -[Zsh Completions](zsh_completions.md). +Cobra can generate documentation based on subcommands, flags, etc. Read more about it in the [docs generation documentation](doc/README.md). -# Contributing +## Generating shell completions -1. Fork it -2. Download your fork to your PC (`git clone https://github.com/your_username/cobra && cd cobra`) -3. Create your feature branch (`git checkout -b my-new-feature`) -4. Make changes and add them (`git add .`) -5. Commit your changes (`git commit -m 'Add some feature'`) -6. Push to the branch (`git push origin my-new-feature`) -7. Create new pull request +Cobra can generate a shell-completion file for the following shells: Bash, Zsh, Fish, Powershell. If you add more information to your commands, these completions can be amazingly powerful and flexible. Read more about it in [Shell Completions](shell_completions.md). # License |