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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 17:15:09 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 17:15:09 +0000 |
commit | ea9f089f6ad153f432b8265a99bce7d261b9c820 (patch) | |
tree | 8590b318bb54874bf1f0c597ff503f8c3b9ace75 /README.md | |
parent | Initial commit. (diff) | |
download | golang-github-spf13-cobra-ea9f089f6ad153f432b8265a99bce7d261b9c820.tar.xz golang-github-spf13-cobra-ea9f089f6ad153f432b8265a99bce7d261b9c820.zip |
Adding upstream version 1.8.0.upstream/1.8.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'README.md')
-rw-r--r-- | README.md | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/README.md b/README.md new file mode 100644 index 0000000..6444f4b --- /dev/null +++ b/README.md @@ -0,0 +1,112 @@ +![cobra logo](assets/CobraMain.png) + +Cobra is a library for creating powerful modern CLI applications. + +Cobra is used in many Go projects such as [Kubernetes](https://kubernetes.io/), +[Hugo](https://gohugo.io), and [GitHub CLI](https://github.com/cli/cli) to +name a few. [This list](site/content/projects_using_cobra.md) contains a more extensive list of projects using Cobra. + +[![](https://img.shields.io/github/actions/workflow/status/spf13/cobra/test.yml?branch=main&longCache=true&label=Test&logo=github%20actions&logoColor=fff)](https://github.com/spf13/cobra/actions?query=workflow%3ATest) +[![Go Reference](https://pkg.go.dev/badge/github.com/spf13/cobra.svg)](https://pkg.go.dev/github.com/spf13/cobra) +[![Go Report Card](https://goreportcard.com/badge/github.com/spf13/cobra)](https://goreportcard.com/report/github.com/spf13/cobra) +[![Slack](https://img.shields.io/badge/Slack-cobra-brightgreen)](https://gophers.slack.com/archives/CD3LP1199) + +# Overview + +Cobra is a library providing a simple interface to create powerful modern CLI +interfaces similar to git & go tools. + +Cobra provides: +* Easy subcommand-based CLIs: `app server`, `app fetch`, etc. +* Fully POSIX-compliant flags (including short & long versions) +* Nested subcommands +* Global, local and cascading flags +* Intelligent suggestions (`app srver`... did you mean `app server`?) +* Automatic help generation for commands and flags +* Grouping help for subcommands +* Automatic help flag recognition of `-h`, `--help`, etc. +* 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. +* Optional seamless integration with [viper](https://github.com/spf13/viper) for 12-factor apps + +# Concepts + +Cobra is built on a structure of commands, arguments & flags. + +**Commands** represent actions, **Args** are things and **Flags** are modifiers for those actions. + +The best applications read like sentences when used, and as a result, users +intuitively know how to interact with them. + +The pattern to follow is +`APPNAME VERB NOUN --ADJECTIVE` + or +`APPNAME COMMAND ARG --FLAG`. + +A few good real world examples may better illustrate this point. + +In the following example, 'server' is a command, and 'port' is a flag: + + hugo server --port=1313 + +In this command we are telling Git to clone the url bare. + + git clone URL --bare + +## Commands + +Command is the central point of the application. Each interaction that +the application supports will be contained in a Command. A command can +have children commands and optionally run an action. + +In the example above, 'server' is the command. + +[More about cobra.Command](https://pkg.go.dev/github.com/spf13/cobra#Command) + +## Flags + +A flag is a way to modify the behavior of a command. Cobra supports +fully POSIX-compliant flags as well as the Go [flag package](https://golang.org/pkg/flag/). +A Cobra command can define flags that persist through to children commands +and flags that are only available to that command. + +In the example above, 'port' is the flag. + +Flag functionality is provided by the [pflag +library](https://github.com/spf13/pflag), a fork of the flag standard library +which maintains the same interface while adding POSIX compliance. + +# Installing +Using Cobra is easy. First, use `go get` to install the latest version +of the library. + +``` +go get -u github.com/spf13/cobra@latest +``` + +Next, include Cobra in your application: + +```go +import "github.com/spf13/cobra" +``` + +# Usage +`cobra-cli` is a command line program to generate cobra applications and command files. +It will bootstrap your application scaffolding to rapidly +develop a Cobra-based application. It is the easiest way to incorporate Cobra into your application. + +It can be installed by running: + +``` +go install github.com/spf13/cobra-cli@latest +``` + +For complete details on using the Cobra-CLI generator, please read [The Cobra Generator README](https://github.com/spf13/cobra-cli/blob/main/README.md) + +For complete details on using the Cobra library, please read the [The Cobra User Guide](site/content/user_guide.md). + +# License + +Cobra is released under the Apache 2.0 license. See [LICENSE.txt](LICENSE.txt) |