add description in docker plugin ls

Signed-off-by: Victor Vieux <vieux@docker.com>

api/client/plugin/list.go

@@ -4,40 +4,58 @@ package plugin
 
 import (
 	"fmt"
+	"strings"
 	"text/tabwriter"
 
 	"github.com/docker/docker/api/client"
 	"github.com/docker/docker/cli"
+	"github.com/docker/docker/pkg/stringutils"
 	"github.com/spf13/cobra"
 	"golang.org/x/net/context"
 )
 
+type listOptions struct {
+	noTrunc bool
+}
+
 func newListCommand(dockerCli *client.DockerCli) *cobra.Command {
+	var opts listOptions
+
 	cmd := &cobra.Command{
 		Use:     "ls",
 		Short:   "List plugins",
 		Aliases: []string{"list"},
 		Args:    cli.NoArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
-			return runList(dockerCli)
+			return runList(dockerCli, opts)
 		},
 	}
 
+	flags := cmd.Flags()
+
+	flags.BoolVar(&opts.noTrunc, "no-trunc", false, "Don't truncate output")
+
 	return cmd
 }
 
-func runList(dockerCli *client.DockerCli) error {
+func runList(dockerCli *client.DockerCli, opts listOptions) error {
 	plugins, err := dockerCli.Client().PluginList(context.Background())
 	if err != nil {
 		return err
 	}
 
 	w := tabwriter.NewWriter(dockerCli.Out(), 20, 1, 3, ' ', 0)
-	fmt.Fprintf(w, "NAME \tTAG \tACTIVE")
+	fmt.Fprintf(w, "NAME \tTAG \tDESCRIPTION\tACTIVE")
 	fmt.Fprintf(w, "\n")
 
 	for _, p := range plugins {
-		fmt.Fprintf(w, "%s\t%s\t%v\n", p.Name, p.Tag, p.Active)
+		desc := strings.Replace(p.Manifest.Description, "\n", " ", -1)
+		desc = strings.Replace(desc, "\r", " ", -1)
+		if !opts.noTrunc && len(desc) > 45 {
+			desc = stringutils.Truncate(desc, 42) + "..."
+		}
+
+		fmt.Fprintf(w, "%s\t%s\t%s\t%v\n", p.Name, p.Tag, desc, p.Active)
 	}
 	w.Flush()
 	return nil

docs/reference/commandline/plugin_disable.md

@@ -30,8 +30,8 @@ and active:
 ```bash
 $ docker plugin ls
 
-NAME                        TAG           ACTIVE
-tiborvass/no-remove         latest        true
+NAME                  TAG                 DESCRIPTION                ACTIVE
+tiborvass/no-remove   latest              A test plugin for Docker   true
 ```
 
 To disable the plugin, use the following command:
@@ -47,8 +47,8 @@ After the plugin is disabled, it appears as "inactive" in the list of plugins:
 ```bash
 $ docker plugin ls
 
-NAME                    VERSION           ACTIVE
-tiborvass/no-remove     latest            false
+NAME                  TAG                 DESCRIPTION                ACTIVE
+tiborvass/no-remove   latest              A test plugin for Docker   false
 ```
 
 ## Related information

docs/reference/commandline/plugin_enable.md

@@ -30,8 +30,8 @@ but disabled ("inactive"):
 ```bash
 $ docker plugin ls
 
-NAME                    VERSION             ACTIVE
-tiborvass/no-remove     latest              false
+NAME                  TAG                 DESCRIPTION                ACTIVE
+tiborvass/no-remove   latest              A test plugin for Docker   false
 ```
 
 To enable the plugin, use the following command:
@@ -47,8 +47,8 @@ After the plugin is enabled, it appears as "active" in the list of plugins:
 ```bash
 $ docker plugin ls
 
-NAME                    VERSION             ACTIVE
-tiborvass/no-remove     latest              true
+NAME                  TAG                 DESCRIPTION                ACTIVE
+tiborvass/no-remove   latest              A test plugin for Docker   true
 ```
 
 ## Related information

docs/reference/commandline/plugin_install.md

@@ -47,8 +47,8 @@ After the plugin is installed, it appears in the list of plugins:
 ```bash
 $ docker plugin ls
 
-NAME                  VERSION             ACTIVE
-tiborvass/no-remove   latest              true
+NAME                  TAG                 DESCRIPTION                ACTIVE
+tiborvass/no-remove   latest              A test plugin for Docker   true
 ```
 
 ## Related information

docs/reference/commandline/plugin_ls.md

@@ -21,6 +21,7 @@ Aliases:
 
 Options:
       --help	   Print usage
+      --no-trunc   Don't truncate output
 ```
 
 Lists all the plugins that are currently installed. You can install plugins
@@ -31,8 +32,8 @@ Example output:
 ```bash
 $ docker plugin ls
 
-NAME                  VERSION             ACTIVE
-tiborvass/no-remove   latest              true
+NAME                  TAG                 DESCRIPTION                ACTIVE
+tiborvass/no-remove   latest              A test plugin for Docker   true
 ```
 
 ## Related information