Merge pull request #3 from postfinance/substring-match

implement substring match

.gitignore

@@ -1 +1 @@
-dist/
+/dist

README.md

@@ -1,33 +1,51 @@
+[![Release](https://img.shields.io/github/release/postfinance/kubectl-ctx.svg?style=for-the-badge)](https://github.com/postfinance/kubectl-ctx/releases/latest)
+[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=for-the-badge)](/LICENSE.md)
+[![Go Report Card](https://img.shields.io/badge/GOREPORT-A%2B-brightgreen.svg?style=for-the-badge)](https://goreportcard.com/report/github.com/postfinance/kubectl-ctx)
 # kubectl ctx plugin
 Simple Plugin to display/change the current kube context in your KUBECONFIG.
 
-# Build/Installation
-## Build from source
-go version >= 1.11 with modules support enabled is required to build the plugin from source
-```bash
-export GO111MODULES=on
-go build
-```
-
-## Installation
+# Installation
+Pre-compiled statically linked binaries are available on the [releases page](https://github.com/postfinance/kubectl-ctx/releases).
 Binary must be placed anywhere in `$PATH` named `kubectl-ctx` with execute permissions.  
 For further information, see the offical documentation on plugins [here](https://kubernetes.io/docs/tasks/extend-kubectl/kubectl-plugins/).
 
 # Compatibility
-Known to work on Windows and Linux. Requires kubectl >= 1.12 (tested with 1.12).
+Known to work on Windows and Linux. Requires kubectl >= 1.12 (tested with versions >1.12).
 
 # Examples
+For all the examples, assume you have the following contexts.
+```
+foo
+bar
+baz
+localhost
+```
 ## display contexts
 Current context is displayed in a different color.
 ```bash
 $ kubectl ctx
+bar
+baz
 foo
+localhost
+```
+
+Substring matching can be used to display contexts. For example if you are searching a context named `ba` simply type:
+```bash
+$ kubectl ctx ba
 bar
 baz
 ```
 
 ## change current context
+You can switch the context by providing an exact name:
 ```bash
 $ kubectl ctx foo
 current context set to "foo"
 ```
+
+But it's also possible to switch to the `localhost` context by typing a substring (as long as it is a unique name), for example:
+```bash
+$ kubectl ctx local
+current context set to "localhost"
+```

cmd/ctx.go

@@ -3,12 +3,13 @@ package cmd
 import (
 	"fmt"
 	"sort"
+	"strings"
 
 	"github.com/fatih/color"
 	"github.com/spf13/cobra"
 	"k8s.io/cli-runtime/pkg/genericclioptions"
 	"k8s.io/client-go/tools/clientcmd"
-	"k8s.io/client-go/tools/clientcmd/api"
+	clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
 )
 
 var (
@@ -25,7 +26,7 @@ var (
 // in a user's KUBECONFIG
 type CtxOptions struct {
 	configFlags *genericclioptions.ConfigFlags
-	rawConfig   api.Config
+	rawConfig   clientcmdapi.Config
 	args        []string
 
 	userSpecifiedContext string
@@ -37,7 +38,7 @@ type CtxOptions struct {
 // NewCtxOptions provides an instance of CtxOptions with default values
 func NewCtxOptions(streams genericclioptions.IOStreams) *CtxOptions {
 	return &CtxOptions{
-		configFlags: genericclioptions.NewConfigFlags(),
+		configFlags: genericclioptions.NewConfigFlags(true),
 		IOStreams:   streams,
 	}
 }
@@ -55,16 +56,10 @@ func NewCtxCmd(streams genericclioptions.IOStreams) *cobra.Command {
 			if err := opt.Complete(c, args); err != nil {
 				return err
 			}
-
 			if err := opt.Validate(); err != nil {
 				return err
 			}
-
-			if err := opt.Run(); err != nil {
-				return err
-			}
-
-			return nil
+			return opt.Run()
 		},
 	}
 	return cmd
@@ -101,45 +96,50 @@ func (o *CtxOptions) Validate() error {
 	return nil
 }
 
-// Run lists all available contexts in a user's KUBECONFIG or updates the current
-// context if the user passed one.
+// Run lists all available contexts in a user's KUBECONFIG or updates the curren context if
+// the user passed one.
 func (o *CtxOptions) Run() error {
-	if len(o.userSpecifiedContext) > 0 {
-		if err := o.changeCurrentCtx(); err != nil {
-			return err
+	selected := []string{}
+	for _, ctx := range o.availableContexts {
+		if ctx == o.userSpecifiedContext {
+			selected = []string{ctx}
+			break
+		}
+		if strings.Contains(ctx, o.userSpecifiedContext) {
+			selected = append(selected, ctx)
 		}
-	} else {
-		o.printContexts()
 	}
-	return nil
-}
-
-func (o *CtxOptions) changeCurrentCtx() error {
-	currentCtx := o.rawConfig.CurrentContext
-	newCtx := o.userSpecifiedContext
 
-	// check if the user provided context exists
-	if _, ok := o.rawConfig.Contexts[newCtx]; !ok {
-		return fmt.Errorf("can't change context to \"%s\", context not found in KUBECONFIG", newCtx)
+	switch len(selected) {
+	case 0:
+		return fmt.Errorf("can't change context to %q, context not found in KUBECONFIG", o.userSpecifiedContext)
+	case 1:
+		return o.changeCurrentCtx(selected[0])
+	default:
+		o.printContexts(selected)
+		return nil
 	}
+}
 
+func (o *CtxOptions) changeCurrentCtx(newCtx string) error {
+	currentCtx := o.rawConfig.CurrentContext
 	if currentCtx != newCtx {
 		o.rawConfig.CurrentContext = newCtx
 		if err := clientcmd.ModifyConfig(clientcmd.NewDefaultPathOptions(), o.rawConfig, true); err != nil {
 			return err
 		}
-		fmt.Fprintf(o.Out, "current context set to \"%s\"\n", newCtx)
+		fmt.Fprintf(o.Out, "current context set to %q\n", newCtx)
 	}
 	return nil
 }
 
-// prints each context in a user's KUBECONFIG, the current context is printed
-// in red
-func (o *CtxOptions) printContexts() {
+// prints each context in a user's KUBECONFIG, the current context is printed in red.
+func (o *CtxOptions) printContexts(contexts []string) {
 	red := color.New(color.FgRed)
-	for _, ctx := range o.availableContexts {
-		if ctx == o.rawConfig.CurrentContext {
-			red.Fprintf(o.Out, "%s\n", ctx)
+	currentCtx := o.rawConfig.CurrentContext
+	for _, ctx := range contexts {
+		if ctx == currentCtx {
+			red.Fprintf(o.Out, "%s\n", currentCtx)
 		} else {
 			fmt.Fprintf(o.Out, "%s\n", ctx)
 		}

go.mod

@@ -1,35 +1,14 @@
 module github.com/postfinance/kubectl-ctx
 
+go 1.13
+
 require (
-	github.com/evanphx/json-patch v4.1.0+incompatible // indirect
+	github.com/Azure/go-autorest v11.1.2+incompatible // indirect
 	github.com/fatih/color v1.7.0
-	github.com/ghodss/yaml v1.0.0 // indirect
-	github.com/gogo/protobuf v1.1.1 // indirect
-	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b // indirect
-	github.com/golang/protobuf v1.2.0 // indirect
-	github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c // indirect
-	github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf // indirect
-	github.com/googleapis/gnostic v0.2.0 // indirect
-	github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7 // indirect
-	github.com/imdario/mergo v0.3.6 // indirect
-	github.com/json-iterator/go v1.1.5 // indirect
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.4 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.1 // indirect
-	github.com/peterbourgon/diskv v2.0.1+incompatible // indirect
-	github.com/spf13/cobra v0.0.3
+	github.com/mattn/go-colorable v0.1.2 // indirect
+	github.com/mattn/go-isatty v0.0.9 // indirect
+	github.com/spf13/cobra v0.0.5
 	github.com/spf13/pflag v1.0.3
-	golang.org/x/crypto v0.0.0-20181001203147-e3636079e1a4 // indirect
-	golang.org/x/net v0.0.0-20181003013248-f5e5bdd77824 // indirect
-	golang.org/x/oauth2 v0.0.0-20181003184128-c57b0facaced // indirect
-	golang.org/x/sys v0.0.0-20181003145944-af653ce8b74f // indirect
-	golang.org/x/text v0.3.0 // indirect
-	golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2 // indirect
-	gopkg.in/inf.v0 v0.9.1 // indirect
-	gopkg.in/yaml.v2 v2.2.1 // indirect
-	k8s.io/api v0.0.0-20180925152912-a191abe0b71e // indirect
-	k8s.io/apimachinery v0.0.0-20181003114359-ed5594dcf47b // indirect
-	k8s.io/cli-runtime v0.0.0-20180927155026-de4bd7443b42
-	k8s.io/client-go v9.0.0-invalid+incompatible
+	k8s.io/cli-runtime v0.0.0-20190831080432-9d670f2021f4
+	k8s.io/client-go v0.0.0-20190831074946-3fe2abece89e
 )