Add json output format to several commands

- docker context ls
- docker ps
- docker compose ls
- docker compose ps
- docker secret ls
- docker volume ls
- docker version

Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>

cli/cmd/compose/compose.go

@@ -33,6 +33,7 @@ type composeOptions struct {
 	WorkingDir  string
 	ConfigPaths []string
 	Environment []string
+	Format      string
 }
 
 func (o *composeOptions) toProjectName() (string, error) {

cli/cmd/compose/list.go

@@ -21,10 +21,16 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"strings"
 
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
 
 	"github.com/docker/compose-cli/api/client"
+	"github.com/docker/compose-cli/api/compose"
+	"github.com/docker/compose-cli/errdefs"
+	"github.com/docker/compose-cli/formatter"
 )
 
 func listCommand() *cobra.Command {
@@ -35,10 +41,15 @@ func listCommand() *cobra.Command {
 			return runList(cmd.Context(), opts)
 		},
 	}
-	lsCmd.Flags().StringVarP(&opts.Name, "project-name", "p", "", "Project name")
+	addComposeCommonFlags(lsCmd.Flags(), &opts)
 	return lsCmd
 }
 
+func addComposeCommonFlags(f *pflag.FlagSet, opts *composeOptions) {
+	f.StringVarP(&opts.Name, "project-name", "p", "", "Project name")
+	f.StringVar(&opts.Format, "format", "", "Format the output. Values: [pretty | json]. (Default: pretty)")
+}
+
 func runList(ctx context.Context, opts composeOptions) error {
 	c, err := client.New(ctx)
 	if err != nil {
@@ -49,10 +60,26 @@ func runList(ctx context.Context, opts composeOptions) error {
 		return err
 	}
 
-	err = printSection(os.Stdout, func(w io.Writer) {
+	return printListFormatted(opts.Format, os.Stdout, stackList)
+}
+
+func printListFormatted(format string, out io.Writer, stackList []compose.Stack) error {
+	var err error
+	switch strings.ToLower(format) {
+	case formatter.PRETTY, "":
+		err = formatter.PrintPrettySection(out, func(w io.Writer) {
 			for _, stack := range stackList {
 				fmt.Fprintf(w, "%s\t%s\n", stack.Name, stack.Status)
 			}
 		}, "NAME", "STATUS")
+	case formatter.JSON:
+		outJSON, err := formatter.ToStandardJSON(stackList)
+		if err != nil {
+			return err
+		}
+		_, _ = fmt.Fprint(out, outJSON)
+	default:
+		err = errors.Wrapf(errdefs.ErrParsingFailed, "format value %q could not be parsed", format)
+	}
 	return err
 }

cli/cmd/compose/list_test.go

@@ -0,0 +1,45 @@
+/*
+   Copyright 2020 Docker Compose CLI authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package compose
+
+import (
+	"bytes"
+	"testing"
+
+	"gotest.tools/assert"
+	"gotest.tools/golden"
+
+	"github.com/docker/compose-cli/api/compose"
+	"github.com/docker/compose-cli/formatter"
+)
+
+func TestPrintComposeList(t *testing.T) {
+	secretList := []compose.Stack{
+		{
+			ID:     "123",
+			Name:   "myName123",
+			Status: "Running",
+		},
+	}
+	out := &bytes.Buffer{}
+	assert.NilError(t, printListFormatted(formatter.PRETTY, out, secretList))
+	golden.Assert(t, out.String(), "compose-list-out.golden")
+
+	out.Reset()
+	assert.NilError(t, printListFormatted(formatter.JSON, out, secretList))
+	golden.Assert(t, out.String(), "compose-list-out-json.golden")
+}

cli/cmd/compose/ps.go

@@ -22,11 +22,14 @@ import (
 	"io"
 	"os"
 	"strings"
-	"text/tabwriter"
 
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
 	"github.com/docker/compose-cli/api/client"
+	"github.com/docker/compose-cli/api/compose"
+	"github.com/docker/compose-cli/errdefs"
+	"github.com/docker/compose-cli/formatter"
 )
 
 func psCommand() *cobra.Command {
@@ -37,10 +40,9 @@ func psCommand() *cobra.Command {
 			return runPs(cmd.Context(), opts)
 		},
 	}
-	psCmd.Flags().StringVarP(&opts.Name, "project-name", "p", "", "Project name")
 	psCmd.Flags().StringVar(&opts.WorkingDir, "workdir", "", "Work dir")
 	psCmd.Flags().StringArrayVarP(&opts.ConfigPaths, "file", "f", []string{}, "Compose configuration files")
-
+	addComposeCommonFlags(psCmd.Flags(), &opts)
 	return psCmd
 }
 
@@ -59,17 +61,26 @@ func runPs(ctx context.Context, opts composeOptions) error {
 		return err
 	}
 
-	err = printSection(os.Stdout, func(w io.Writer) {
+	return printPsFormatted(opts.Format, os.Stdout, serviceList)
+}
+
+func printPsFormatted(format string, out io.Writer, serviceList []compose.ServiceStatus) error {
+	var err error
+	switch strings.ToLower(format) {
+	case formatter.PRETTY, "":
+		err = formatter.PrintPrettySection(out, func(w io.Writer) {
 			for _, service := range serviceList {
 				fmt.Fprintf(w, "%s\t%s\t%d/%d\t%s\n", service.ID, service.Name, service.Replicas, service.Desired, strings.Join(service.Ports, ", "))
 			}
 		}, "ID", "NAME", "REPLICAS", "PORTS")
+	case formatter.JSON:
+		outJSON, err := formatter.ToStandardJSON(serviceList)
+		if err != nil {
 			return err
 		}
-
+		_, _ = fmt.Fprint(out, outJSON)
-func printSection(out io.Writer, printer func(io.Writer), headers ...string) error {
+	default:
-	w := tabwriter.NewWriter(out, 20, 1, 3, ' ', 0)
+		err = errors.Wrapf(errdefs.ErrParsingFailed, "format value %q could not be parsed", format)
-	fmt.Fprintln(w, strings.Join(headers, "\t"))
+	}
-	printer(w)
+	return err
-	return w.Flush()
 }

cli/cmd/compose/testdata/compose-list-out-json.golden

@@ -0,0 +1,7 @@
+[
+    {
+        "ID": "123",
+        "Name": "myName123",
+        "Status": "Running"
+    }
+]

cli/cmd/compose/testdata/compose-list-out.golden

@@ -0,0 +1,2 @@
+NAME                STATUS
+myName123           Running

cli/cmd/context/ls.go

@@ -17,18 +17,19 @@
 package context
 
 import (
-	"errors"
 	"fmt"
+	"io"
 	"os"
 	"sort"
 	"strings"
-	"text/tabwriter"
 
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
 	"github.com/docker/compose-cli/cli/mobycli"
 	apicontext "github.com/docker/compose-cli/context"
 	"github.com/docker/compose-cli/context/store"
+	"github.com/docker/compose-cli/errdefs"
 	"github.com/docker/compose-cli/formatter"
 )
 
@@ -58,7 +59,8 @@ func listCommand() *cobra.Command {
 	}
 	cmd.Flags().BoolVarP(&opts.quiet, "quiet", "q", false, "Only show context names")
 	cmd.Flags().BoolVar(&opts.json, "json", false, "Format output as JSON")
-	cmd.Flags().StringVar(&opts.format, "format", "", "Format output as JSON")
+	cmd.Flags().StringVar(&opts.format, "format", "", "Format the output. Values: [pretty | json | go template]. (Default: pretty)")
+	_ = cmd.Flags().MarkHidden("json")
 
 	return cmd
 }
@@ -68,7 +70,7 @@ func runList(cmd *cobra.Command, opts lsOpts) error {
 	if err != nil {
 		return err
 	}
-	if opts.format != "" {
+	if opts.format != "" && opts.format != formatter.JSON && opts.format != formatter.PRETTY {
 		mobycli.Exec(cmd.Root())
 		return nil
 	}
@@ -93,26 +95,23 @@ func runList(cmd *cobra.Command, opts lsOpts) error {
 	}
 
 	if opts.json {
-		j, err := formatter.ToStandardJSON(contexts)
+		opts.format = formatter.JSON
-		if err != nil {
-			return err
-		}
-		fmt.Println(j)
-		return nil
 	}
 
-	w := tabwriter.NewWriter(os.Stdout, 20, 1, 3, ' ', 0)
+	return printContextLsFormatted(opts.format, currentContext, os.Stdout, contexts)
-	fmt.Fprintln(w, "NAME\tTYPE\tDESCRIPTION\tDOCKER ENDPOINT\tKUBERNETES ENDPOINT\tORCHESTRATOR")
+}
-	format := "%s\t%s\t%s\t%s\t%s\t%s\n"
 
+func printContextLsFormatted(format string, currContext string, out io.Writer, contexts []*store.DockerContext) error {
+	var err error
+	switch strings.ToLower(format) {
+	case formatter.PRETTY, "":
+		err = formatter.PrintPrettySection(out, func(w io.Writer) {
 			for _, c := range contexts {
 				contextName := c.Name
-		if c.Name == currentContext {
+				if c.Name == currContext {
 					contextName += " *"
 				}
-
+				fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\t%s\n",
-		fmt.Fprintf(w,
-			format,
 					contextName,
 					c.Type(),
 					c.Metadata.Description,
@@ -120,8 +119,17 @@ func runList(cmd *cobra.Command, opts lsOpts) error {
 					getEndpoint("kubernetes", c.Endpoints),
 					c.Metadata.StackOrchestrator)
 			}
-
+		}, "NAME", "TYPE", "DESCRIPTION", "DOCKER ENDPOINT", "KUBERNETES ENDPOINT", "ORCHESTRATOR")
-	return w.Flush()
+	case formatter.JSON:
+		out, err := formatter.ToStandardJSON(contexts)
+		if err != nil {
+			return err
+		}
+		fmt.Println(out)
+	default:
+		err = errors.Wrapf(errdefs.ErrParsingFailed, "format value %q could not be parsed", format)
+	}
+	return err
 }
 
 func getEndpoint(name string, meta map[string]interface{}) string {

cli/cmd/ps.go

@@ -19,15 +19,16 @@ package cmd
 import (
 	"context"
 	"fmt"
+	"io"
 	"os"
 	"strings"
-	"text/tabwriter"
 
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
 	"github.com/docker/compose-cli/api/client"
 	"github.com/docker/compose-cli/api/containers"
+	"github.com/docker/compose-cli/errdefs"
 	formatter2 "github.com/docker/compose-cli/formatter"
 	"github.com/docker/compose-cli/utils/formatter"
 )
@@ -36,13 +37,7 @@ type psOpts struct {
 	all    bool
 	quiet  bool
 	json   bool
-}
+	format string
-
-func (o psOpts) validate() error {
-	if o.quiet && o.json {
-		return errors.New(`cannot combine "quiet" and "json" options`)
-	}
-	return nil
 }
 
 // PsCommand lists containers
@@ -59,50 +54,69 @@ func PsCommand() *cobra.Command {
 	cmd.Flags().BoolVarP(&opts.quiet, "quiet", "q", false, "Only display IDs")
 	cmd.Flags().BoolVarP(&opts.all, "all", "a", false, "Show all containers (default shows just running)")
 	cmd.Flags().BoolVar(&opts.json, "json", false, "Format output as JSON")
+	cmd.Flags().StringVar(&opts.format, "format", "", "Format the output. Values: [pretty | json | go template]. (Default: pretty)")
+	_ = cmd.Flags().MarkHidden("json")
 
 	return cmd
 }
 
+func (o psOpts) validate() error {
+	if o.quiet && o.json {
+		return errors.New(`cannot combine "quiet" and "json" options`)
+	}
+	return nil
+}
+
 func runPs(ctx context.Context, opts psOpts) error {
 	err := opts.validate()
 	if err != nil {
 		return err
 	}
-
 	c, err := client.New(ctx)
 	if err != nil {
 		return errors.Wrap(err, "cannot connect to backend")
 	}
 
-	containers, err := c.ContainerService().List(ctx, opts.all)
+	containerList, err := c.ContainerService().List(ctx, opts.all)
 	if err != nil {
-		return errors.Wrap(err, "fetch containers")
+		return errors.Wrap(err, "fetch containerList")
 	}
 
 	if opts.quiet {
-		for _, c := range containers {
+		for _, c := range containerList {
 			fmt.Println(c.ID)
 		}
 		return nil
 	}
 
 	if opts.json {
-		j, err := formatter2.ToStandardJSON(containers)
+		opts.format = formatter2.JSON
+	}
+
+	return printPsFormatted(opts.format, os.Stdout, containerList)
+}
+
+func printPsFormatted(format string, out io.Writer, containers []containers.Container) error {
+	var err error
+	switch strings.ToLower(format) {
+	case formatter2.PRETTY, "":
+		err = formatter2.PrintPrettySection(out, func(w io.Writer) {
+			for _, c := range containers {
+				fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\n", c.ID, c.Image, c.Command, c.Status,
+					strings.Join(formatter.PortsToStrings(c.Ports, fqdn(c)), ", "))
+			}
+		}, "CONTAINER ID", "IMAGE", "COMMAND", "STATUS", "PORTS")
+	case formatter2.JSON:
+		out, err := formatter2.ToStandardJSON(containers)
 		if err != nil {
 			return err
 		}
-		fmt.Println(j)
+		fmt.Println(out)
-		return nil
-	}
 
-	w := tabwriter.NewWriter(os.Stdout, 20, 1, 3, ' ', 0)
+	default:
-	fmt.Fprintf(w, "CONTAINER ID\tIMAGE\tCOMMAND\tSTATUS\tPORTS\n")
+		err = errors.Wrapf(errdefs.ErrParsingFailed, "format value %q could not be parsed", format)
-	format := "%s\t%s\t%s\t%s\t%s\n"
-	for _, container := range containers {
-		fmt.Fprintf(w, format, container.ID, container.Image, container.Command, container.Status, strings.Join(formatter.PortsToStrings(container.Ports, fqdn(container)), ", "))
 	}
-
+	return err
-	return w.Flush()
 }
 
 func fqdn(container containers.Container) string {

cli/cmd/secrets.go

@@ -21,12 +21,14 @@ import (
 	"io"
 	"os"
 	"strings"
-	"text/tabwriter"
 
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
 	"github.com/docker/compose-cli/api/client"
 	"github.com/docker/compose-cli/api/secrets"
+	"github.com/docker/compose-cli/errdefs"
+	"github.com/docker/compose-cli/formatter"
 )
 
 type createSecretOptions struct {
@@ -105,7 +107,12 @@ func inspectSecret() *cobra.Command {
 	return cmd
 }
 
+type listSecretsOpts struct {
+	format string
+}
+
 func listSecrets() *cobra.Command {
+	var opts listSecretsOpts
 	cmd := &cobra.Command{
 		Use:     "list",
 		Aliases: []string{"ls"},
@@ -119,10 +126,10 @@ func listSecrets() *cobra.Command {
 			if err != nil {
 				return err
 			}
-			printList(os.Stdout, list)
+			return printSecretList(opts.format, os.Stdout, list)
-			return nil
 		},
 	}
+	cmd.Flags().StringVar(&opts.format, "format", "", "Format the output. Values: [pretty | json]. (Default: pretty)")
 	return cmd
 }
 
@@ -149,17 +156,23 @@ func deleteSecret() *cobra.Command {
 	return cmd
 }
 
-func printList(out io.Writer, secrets []secrets.Secret) {
+func printSecretList(format string, out io.Writer, secrets []secrets.Secret) error {
-	printSection(out, func(w io.Writer) {
+	var err error
+	switch strings.ToLower(format) {
+	case formatter.PRETTY, "":
+		err = formatter.PrintPrettySection(out, func(w io.Writer) {
 			for _, secret := range secrets {
 				fmt.Fprintf(w, "%s\t%s\t%s\n", secret.ID, secret.Name, secret.Description) // nolint:errcheck
 			}
 		}, "ID", "NAME", "DESCRIPTION")
+	case formatter.JSON:
+		outJSON, err := formatter.ToStandardJSON(secrets)
+		if err != nil {
+			return err
 		}
-
+		_, _ = fmt.Fprint(out, outJSON)
-func printSection(out io.Writer, printer func(io.Writer), headers ...string) {
+	default:
-	w := tabwriter.NewWriter(out, 20, 1, 3, ' ', 0)
+		err = errors.Wrapf(errdefs.ErrParsingFailed, "format value %q could not be parsed", format)
-	fmt.Fprintln(w, strings.Join(headers, "\t")) // nolint:errcheck
+	}
-	printer(w)
+	return err
-	w.Flush() // nolint:errcheck
 }

cli/cmd/secrets_test.go

@@ -20,13 +20,15 @@ import (
 	"bytes"
 	"testing"
 
+	"gotest.tools/assert"
 	"gotest.tools/v3/golden"
 
 	"github.com/docker/compose-cli/api/secrets"
+	"github.com/docker/compose-cli/formatter"
 )
 
 func TestPrintList(t *testing.T) {
-	secrets := []secrets.Secret{
+	secretList := []secrets.Secret{
 		{
 			ID:          "123",
 			Name:        "secret123",
@@ -34,6 +36,10 @@ func TestPrintList(t *testing.T) {
 		},
 	}
 	out := &bytes.Buffer{}
-	printList(out, secrets)
+	assert.NilError(t, printSecretList(formatter.PRETTY, out, secretList))
 	golden.Assert(t, out.String(), "secrets-out.golden")
+
+	out.Reset()
+	assert.NilError(t, printSecretList(formatter.JSON, out, secretList))
+	golden.Assert(t, out.String(), "secrets-out-json.golden")
 }

cli/cmd/testdata/secrets-out-json.golden

@@ -0,0 +1,8 @@
+[
+    {
+        "ID": "123",
+        "Name": "secret123",
+        "Labels": null,
+        "Description": "secret 1,2,3"
+    }
+]

cli/cmd/version.go

@@ -18,43 +18,94 @@ package cmd
 
 import (
 	"fmt"
+	"os"
 	"strings"
 
 	"github.com/spf13/cobra"
 
 	"github.com/docker/compose-cli/cli/cmd/mobyflags"
 	"github.com/docker/compose-cli/cli/mobycli"
+	"github.com/docker/compose-cli/formatter"
 )
 
+const formatOpt = "format"
+
 // VersionCommand command to display version
 func VersionCommand(version string) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "version",
 		Short: "Show the Docker version information",
 		Args:  cobra.MaximumNArgs(0),
-		RunE: func(cmd *cobra.Command, _ []string) error {
+		Run: func(cmd *cobra.Command, _ []string) {
-			return runVersion(cmd, version)
+			runVersion(cmd, version)
 		},
 	}
 	// define flags for backward compatibility with com.docker.cli
 	flags := cmd.Flags()
-	flags.StringP("format", "f", "", "Format the output using the given Go template")
+	flags.StringP(formatOpt, "f", "", "Format the output using the given Go template")
+	// flags.String(&opts.format, "format", "", "Format the output. Values: [pretty | json | go template]. (Default: pretty)")
 	flags.String("kubeconfig", "", "Kubernetes config file")
 	mobyflags.AddMobyFlagsForRetrocompatibility(flags)
 
 	return cmd
 }
 
-func runVersion(cmd *cobra.Command, version string) error {
+func runVersion(cmd *cobra.Command, version string) {
+	var versionString string
+	format := strings.TrimSpace(cmd.Flag(formatOpt).Value.String())
 	displayedVersion := strings.TrimPrefix(version, "v")
-	versionResult, _ := mobycli.ExecSilent(cmd.Context())
+	// Replace is preferred in this case to keep the order.
+	switch format {
+	case formatter.PRETTY, "":
+		versionString = strings.Replace(getOutFromMoby(cmd, fixedPrettyArgs(os.Args[1:])...),
+			"\n Version:", "\n Cloud integration:  "+displayedVersion+"\n Version:", 1)
+	case formatter.JSON, "{{json .}}", "{{json . }}", "{{ json .}}", "{{ json . }}": // Try to catch full JSON formats
+		versionString = strings.Replace(getOutFromMoby(cmd, fixedJSONArgs(os.Args[1:])...),
+			`"Version":`, fmt.Sprintf(`"CloudIntegration":%q,"Version":`, displayedVersion), 1)
+	}
+	fmt.Print(versionString)
+}
+
+func getOutFromMoby(cmd *cobra.Command, args ...string) string {
+	versionResult, _ := mobycli.ExecSilent(cmd.Context(), args...)
 	// we don't want to fail on error, there is an error if the engine is not available but it displays client version info
 	// Still, technically the [] byte versionResult could be nil, just let the original command display what it has to display
 	if versionResult == nil {
 		mobycli.Exec(cmd.Root())
-		return nil
+		return ""
 	}
-	var s string = string(versionResult)
+	return string(versionResult)
-	fmt.Print(strings.Replace(s, "\n Version:", "\n Cloud integration  "+displayedVersion+"\n Version:", 1))
+}
-	return nil
+
+func fixedPrettyArgs(oArgs []string) []string {
+	var args []string
+	for i := 0; i < len(oArgs); i++ {
+		if isFormatOpt(oArgs[i]) &&
+			len(oArgs) > i &&
+			(strings.ToLower(oArgs[i+1]) == formatter.PRETTY || oArgs[i+1] == "") {
+			i++
+			continue
+		}
+		args = append(args, oArgs[i])
+	}
+	return args
+}
+
+func fixedJSONArgs(oArgs []string) []string {
+	var args []string
+	for i := 0; i < len(oArgs); i++ {
+		if isFormatOpt(oArgs[i]) &&
+			len(oArgs) > i &&
+			strings.ToLower(oArgs[i+1]) == formatter.JSON {
+			args = append(args, oArgs[i], "{{json .}}")
+			i++
+			continue
+		}
+		args = append(args, oArgs[i])
+	}
+	return args
+}
+
+func isFormatOpt(o string) bool {
+	return o == "--format" || o == "-f"
 }

cli/cmd/version_test.go

@@ -0,0 +1,190 @@
+/*
+   Copyright 2020 Docker Compose CLI authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package cmd
+
+import (
+	"testing"
+
+	"gotest.tools/assert"
+)
+
+type caze struct {
+	Actual   []string
+	Expected []string
+}
+
+func TestVersionFormat(t *testing.T) {
+	jsonCases := []caze{
+		{
+			Actual:   fixedJSONArgs([]string{}),
+			Expected: nil,
+		},
+		{
+			Actual: fixedJSONArgs([]string{
+				"docker",
+				"version",
+			}),
+			Expected: []string{
+				"docker",
+				"version",
+			},
+		},
+		{
+			Actual: fixedJSONArgs([]string{
+				"docker",
+				"version",
+				"--format",
+				"json",
+			}),
+			Expected: []string{
+				"docker",
+				"version",
+				"--format",
+				"{{json .}}",
+			},
+		},
+		{
+			Actual: fixedJSONArgs([]string{
+				"docker",
+				"version",
+				"--format",
+				"jSoN",
+			}),
+			Expected: []string{
+				"docker",
+				"version",
+				"--format",
+				"{{json .}}",
+			},
+		},
+		{
+			Actual: fixedJSONArgs([]string{
+				"docker",
+				"version",
+				"--format",
+				"json",
+				"--kubeconfig",
+				"myKubeConfig",
+			}),
+			Expected: []string{
+				"docker",
+				"version",
+				"--format",
+				"{{json .}}",
+				"--kubeconfig",
+				"myKubeConfig",
+			},
+		},
+		{
+			Actual: fixedJSONArgs([]string{
+				"--format",
+				"json",
+			}),
+			Expected: []string{
+				"--format",
+				"{{json .}}",
+			},
+		},
+	}
+	prettyCases := []caze{
+		{
+			Actual:   fixedPrettyArgs([]string{}),
+			Expected: nil,
+		},
+		{
+			Actual: fixedPrettyArgs([]string{
+				"docker",
+				"version",
+			}),
+			Expected: []string{
+				"docker",
+				"version",
+			},
+		},
+		{
+			Actual: fixedPrettyArgs([]string{
+				"docker",
+				"version",
+				"--format",
+				"pretty",
+			}),
+			Expected: []string{
+				"docker",
+				"version",
+			},
+		},
+		{
+			Actual: fixedPrettyArgs([]string{
+				"docker",
+				"version",
+				"--format",
+				"pRettY",
+			}),
+			Expected: []string{
+				"docker",
+				"version",
+			},
+		},
+		{
+			Actual: fixedPrettyArgs([]string{
+				"docker",
+				"version",
+				"--format",
+				"",
+			}),
+			Expected: []string{
+				"docker",
+				"version",
+			},
+		},
+		{
+			Actual: fixedPrettyArgs([]string{
+				"docker",
+				"version",
+				"--format",
+				"pretty",
+				"--kubeconfig",
+				"myKubeConfig",
+			}),
+			Expected: []string{
+				"docker",
+				"version",
+				"--kubeconfig",
+				"myKubeConfig",
+			},
+		},
+		{
+			Actual: fixedPrettyArgs([]string{
+				"--format",
+				"pretty",
+			}),
+			Expected: nil,
+		},
+	}
+
+	t.Run("json", func(t *testing.T) {
+		for _, c := range jsonCases {
+			assert.DeepEqual(t, c.Actual, c.Expected)
+		}
+	})
+
+	t.Run("pretty", func(t *testing.T) {
+		for _, c := range prettyCases {
+			assert.DeepEqual(t, c.Actual, c.Expected)
+		}
+	})
+}

cli/cmd/volume/list.go

@@ -21,15 +21,22 @@ import (
 	"io"
 	"os"
 	"strings"
-	"text/tabwriter"
 
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 
 	"github.com/docker/compose-cli/api/client"
 	"github.com/docker/compose-cli/api/volumes"
+	"github.com/docker/compose-cli/errdefs"
+	"github.com/docker/compose-cli/formatter"
 )
 
+type listVolumeOpts struct {
+	format string
+}
+
 func listVolume() *cobra.Command {
+	var opts listVolumeOpts
 	cmd := &cobra.Command{
 		Use:   "ls",
 		Short: "list available volumes in context.",
@@ -43,24 +50,30 @@ func listVolume() *cobra.Command {
 			if err != nil {
 				return err
 			}
-			printList(os.Stdout, vols)
+			return printList(opts.format, os.Stdout, vols)
-			return nil
 		},
 	}
+	cmd.Flags().StringVar(&opts.format, "format", formatter.PRETTY, "Format the output. Values: [pretty | json]. (Default: pretty)")
 	return cmd
 }
 
-func printList(out io.Writer, volumes []volumes.Volume) {
+func printList(format string, out io.Writer, volumes []volumes.Volume) error {
-	printSection(out, func(w io.Writer) {
+	var err error
+	switch strings.ToLower(format) {
+	case formatter.PRETTY, "":
+		_ = formatter.PrintPrettySection(out, func(w io.Writer) {
 			for _, vol := range volumes {
 				_, _ = fmt.Fprintf(w, "%s\t%s\n", vol.ID, vol.Description)
 			}
 		}, "ID", "DESCRIPTION")
+	case formatter.JSON:
+		outJSON, err := formatter.ToStandardJSON(volumes)
+		if err != nil {
+			return err
 		}
-
+		_, _ = fmt.Fprint(out, outJSON)
-func printSection(out io.Writer, printer func(io.Writer), headers ...string) {
+	default:
-	w := tabwriter.NewWriter(out, 20, 1, 3, ' ', 0)
+		err = errors.Wrapf(errdefs.ErrParsingFailed, "format value %q could not be parsed", format)
-	_, _ = fmt.Fprintln(w, strings.Join(headers, "\t"))
+	}
-	printer(w)
+	return err
-	_ = w.Flush()
 }

cli/cmd/volume/list_test.go

@@ -20,9 +20,11 @@ import (
 	"bytes"
 	"testing"
 
+	"gotest.tools/assert"
 	"gotest.tools/v3/golden"
 
 	"github.com/docker/compose-cli/api/volumes"
+	"github.com/docker/compose-cli/formatter"
 )
 
 func TestPrintList(t *testing.T) {
@@ -33,6 +35,11 @@ func TestPrintList(t *testing.T) {
 		},
 	}
 	out := &bytes.Buffer{}
-	printList(out, secrets)
+	assert.NilError(t, printList(formatter.PRETTY, out, secrets))
 	golden.Assert(t, out.String(), "volumes-out.golden")
+
+	out.Reset()
+	assert.NilError(t, printList(formatter.JSON, out, secrets))
+	golden.Assert(t, out.String(), "volumes-out-json.golden")
+
 }

cli/cmd/volume/testdata/volumes-out-json.golden

@@ -0,0 +1,6 @@
+[
+    {
+        "ID": "volume/123",
+        "Description": "volume 123"
+    }
+]

cli/mobycli/exec.go

@@ -112,7 +112,10 @@ func IsDefaultContextCommand(dockerCommand string) bool {
 }
 
 // ExecSilent executes a command and do redirect output to stdOut, return output
-func ExecSilent(ctx context.Context) ([]byte, error) {
+func ExecSilent(ctx context.Context, args ...string) ([]byte, error) {
-	cmd := exec.CommandContext(ctx, ComDockerCli, os.Args[1:]...)
+	if len(args) == 0 {
+		args = os.Args[1:]
+	}
+	cmd := exec.CommandContext(ctx, ComDockerCli, args...)
 	return cmd.CombinedOutput()
 }

formatter/consts.go

@@ -0,0 +1,24 @@
+/*
+   Copyright 2020 Docker Compose CLI authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package formatter
+
+const (
+	// JSON is the constant for Json formats on list commands
+	JSON = "json"
+	// PRETTY is the constant for default formats on list commands
+	PRETTY = "pretty"
+)

formatter/pretty.go

@@ -0,0 +1,32 @@
+/*
+   Copyright 2020 Docker Compose CLI authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package formatter
+
+import (
+	"fmt"
+	"io"
+	"strings"
+	"text/tabwriter"
+)
+
+// PrintPrettySection prints a tabbed section on the writer parameter
+func PrintPrettySection(out io.Writer, printer func(writer io.Writer), headers ...string) error {
+	w := tabwriter.NewWriter(out, 20, 1, 3, ' ', 0)
+	fmt.Fprintln(w, strings.Join(headers, "\t"))
+	printer(w)
+	return w.Flush()
+}

go.mod

@@ -62,5 +62,6 @@ require (
 	google.golang.org/protobuf v1.25.0
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/ini.v1 v1.61.0
+	gotest.tools v2.2.0+incompatible
 	gotest.tools/v3 v3.0.2
 )

tests/e2e/e2e_test.go

@@ -75,6 +75,12 @@ func TestContextDefault(t *testing.T) {
 	t.Run("ls", func(t *testing.T) {
 		res := c.RunDockerCmd("context", "ls")
 		golden.Assert(t, res.Stdout(), GoldenFile("ls-out-default"))
+
+		res = c.RunDockerCmd("context", "ls", "--format", "pretty")
+		golden.Assert(t, res.Stdout(), GoldenFile("ls-out-default"))
+
+		res = c.RunDockerCmd("context", "ls", "--format", "json")
+		golden.Assert(t, res.Stdout(), GoldenFile("ls-out-json"))
 	})
 
 	t.Run("inspect", func(t *testing.T) {
@@ -407,6 +413,26 @@ func TestVersion(t *testing.T) {
 		res.Assert(t, icmd.Expected{Out: `"Client":`})
 	})
 
+	t.Run("format cloud integration", func(t *testing.T) {
+		res := c.RunDockerCmd("version", "-f", "pretty")
+		res.Assert(t, icmd.Expected{Out: `Cloud integration:`})
+		res = c.RunDockerCmd("version", "-f", "")
+		res.Assert(t, icmd.Expected{Out: `Cloud integration:`})
+
+		res = c.RunDockerCmd("version", "-f", "json")
+		res.Assert(t, icmd.Expected{Out: `"CloudIntegration":`})
+		res = c.RunDockerCmd("version", "-f", "{{ json . }}")
+		res.Assert(t, icmd.Expected{Out: `"CloudIntegration":`})
+		res = c.RunDockerCmd("version", "--format", "{{json .}}")
+		res.Assert(t, icmd.Expected{Out: `"CloudIntegration":`})
+		res = c.RunDockerCmd("version", "--format", "{{json . }}")
+		res.Assert(t, icmd.Expected{Out: `"CloudIntegration":`})
+		res = c.RunDockerCmd("version", "--format", "{{ json .}}")
+		res.Assert(t, icmd.Expected{Out: `"CloudIntegration":`})
+		res = c.RunDockerCmd("version", "--format", "{{ json . }}")
+		res.Assert(t, icmd.Expected{Out: `"CloudIntegration":`})
+	})
+
 	t.Run("delegate version flag", func(t *testing.T) {
 		c.RunDockerCmd("context", "create", "example", "test-example")
 		c.RunDockerCmd("context", "use", "test-example")
@@ -431,6 +457,12 @@ func TestMockBackend(t *testing.T) {
 	t.Run("ps", func(t *testing.T) {
 		res := c.RunDockerCmd("ps")
 		golden.Assert(t, res.Stdout(), "ps-out-example.golden")
+
+		res = c.RunDockerCmd("ps", "--format", "pretty")
+		golden.Assert(t, res.Stdout(), "ps-out-example.golden")
+
+		res = c.RunDockerCmd("ps", "--format", "json")
+		golden.Assert(t, res.Stdout(), "ps-out-example-json.golden")
 	})
 
 	t.Run("ps quiet", func(t *testing.T) {

tests/e2e/testdata/ls-out-json.golden

@@ -0,0 +1,16 @@
+[
+    {
+        "Name": "default",
+        "Metadata": {
+            "Description": "Current DOCKER_HOST based configuration",
+            "StackOrchestrator": "swarm",
+            "Type": "moby"
+        },
+        "Endpoints": {
+            "docker": {
+                "Host": "unix:///var/run/docker.sock"
+            },
+            "kubernetes": {}
+        }
+    }
+]

tests/e2e/testdata/ps-out-example-json.golden

@@ -0,0 +1,30 @@
+[
+    {
+        "ID": "id",
+        "Status": "",
+        "Image": "nginx",
+        "Command": "",
+        "CPUTime": 0,
+        "CPULimit": 0,
+        "MemoryUsage": 0,
+        "MemoryLimit": 0,
+        "PidsCurrent": 0,
+        "PidsLimit": 0,
+        "Platform": "",
+        "RestartPolicyCondition": ""
+    },
+    {
+        "ID": "1234",
+        "Status": "",
+        "Image": "alpine",
+        "Command": "",
+        "CPUTime": 0,
+        "CPULimit": 0,
+        "MemoryUsage": 0,
+        "MemoryLimit": 0,
+        "PidsCurrent": 0,
+        "PidsLimit": 0,
+        "Platform": "",
+        "RestartPolicyCondition": ""
+    }
+]