[PoC] Add --json flag to cli commands

cf/cmd/cmd.go

@@ -226,3 +226,22 @@ func handleVerbose(args []string) ([]string, bool) {
 
 	return args, verbose
 }
+
+func handleJSON(args []string) ([]string, bool) {
+	var isJSON bool
+	idx := -1
+
+	for i, arg := range args {
+		if arg == "--json" {
+			idx = i
+			break
+		}
+	}
+
+	if idx != -1 && len(args) > 1 {
+		isJSON = true
+		args = append(args[:idx], args[idx+1:]...)
+	}
+
+	return args, isJSON
+}

command/v7/app_command.go

@@ -1,17 +1,23 @@
 package v7
 
 import (
+	"code.cloudfoundry.org/cli/actor/v7action"
 	"code.cloudfoundry.org/cli/command/flag"
 	"code.cloudfoundry.org/cli/command/v7/shared"
 )
 
+type AppDisplayer interface {
+	AppDisplay(summary v7action.DetailedApplicationSummary, displayStartCommand bool)
+}
+
 type AppCommand struct {
 	BaseCommand
 
 	RequiredArgs    flag.AppName `positional-args:"yes"`
 	GUID            bool         `long:"guid" description:"Retrieve and display the given app's guid.  All other health and status output for the app is suppressed."`
 	usage           interface{}  `usage:"CF_NAME app APP_NAME [--guid]"`
 	relatedCommands interface{}  `related_commands:"apps, events, logs, map-route, unmap-route, push"`
+	JSONOutput      bool         `long:"json" description:"Output in json form"`
 }
 
 func (cmd AppCommand) Execute(args []string) error {
@@ -29,15 +35,18 @@ func (cmd AppCommand) Execute(args []string) error {
 		return err
 	}
 
-	cmd.UI.DisplayTextWithFlavor("Showing health and status for app {{.AppName}} in org {{.OrgName}} / space {{.SpaceName}} as {{.Username}}...", map[string]interface{}{
-		"AppName":   cmd.RequiredArgs.AppName,
-		"OrgName":   cmd.Config.TargetedOrganization().Name,
-		"SpaceName": cmd.Config.TargetedSpace().Name,
-		"Username":  user.Name,
-	})
-	cmd.UI.DisplayNewline()
+	var appSummaryDisplayer AppDisplayer = shared.NewAppSummaryJSONDisplayer(cmd.UI)
+	if !cmd.JSONOutput {
+		cmd.UI.DisplayTextWithFlavor("Showing health and status for app {{.AppName}} in org {{.OrgName}} / space {{.SpaceName}} as {{.Username}}...", map[string]interface{}{
+			"AppName":   cmd.RequiredArgs.AppName,
+			"OrgName":   cmd.Config.TargetedOrganization().Name,
+			"SpaceName": cmd.Config.TargetedSpace().Name,
+			"Username":  user.Name,
+		})
+		cmd.UI.DisplayNewline()
+		appSummaryDisplayer = shared.NewAppSummaryDisplayer(cmd.UI)
+	}
 
-	appSummaryDisplayer := shared.NewAppSummaryDisplayer(cmd.UI)
 	summary, warnings, err := cmd.Actor.GetDetailedAppSummary(cmd.RequiredArgs.AppName, cmd.Config.TargetedSpace().GUID, false)
 	cmd.UI.DisplayWarnings(warnings)
 	if err != nil {
@@ -55,6 +64,10 @@ func (cmd AppCommand) displayAppGUID() error {
 		return err
 	}
 
+	if cmd.JSONOutput {
+		return cmd.UI.DisplayJSON("", map[string]string{"guid": app.GUID})
+	}
+
 	cmd.UI.DisplayText(app.GUID)
 	return nil
 }

command/v7/apps_command.go

@@ -3,6 +3,7 @@ package v7
 import (
 	"strings"
 
+	"code.cloudfoundry.org/cli/actor/v7action"
 	"code.cloudfoundry.org/cli/resources"
 	"code.cloudfoundry.org/cli/util/ui"
 )
@@ -13,8 +14,9 @@ type AppsCommand struct {
 	usage           interface{} `usage:"CF_NAME apps [--labels SELECTOR]\n\nEXAMPLES:\n   CF_NAME apps\n   CF_NAME apps --labels 'environment in (production,staging),tier in (backend)'\n   CF_NAME apps --labels 'env=dev,!chargeback-code,tier in (backend,worker)'"`
 	relatedCommands interface{} `related_commands:"events, logs, map-route, push, scale, start, stop, restart"`
 
-	Labels    string `long:"labels" description:"Selector to filter apps by labels"`
-	OmitStats bool   `long:"no-stats" description:"Do not retrieve process stats"`
+	Labels     string `long:"labels" description:"Selector to filter apps by labels"`
+	OmitStats  bool   `long:"no-stats" description:"Do not retrieve process stats"`
+	JSONOutput bool   `long:"json" description:"Output in json form"`
 }
 
 func (cmd AppsCommand) Execute(args []string) error {
@@ -41,6 +43,10 @@ func (cmd AppsCommand) Execute(args []string) error {
 		return err
 	}
 
+	if cmd.JSONOutput {
+		return cmd.UI.DisplayJSON("", map[string][]v7action.ApplicationSummary{"apps": summaries})
+	}
+
 	if len(summaries) == 0 {
 		cmd.UI.DisplayText("No apps found")
 		return nil

command/v7/get_health_check_command.go

@@ -13,6 +13,7 @@ type GetHealthCheckCommand struct {
 
 	RequiredArgs flag.AppName `positional-args:"yes"`
 	usage        interface{}  `usage:"CF_NAME get-health-check APP_NAME"`
+	JSONOutput   bool         `long:"json" description:"Output in json form"`
 }
 
 func (cmd GetHealthCheckCommand) Execute(args []string) error {
@@ -39,6 +40,10 @@ func (cmd GetHealthCheckCommand) Execute(args []string) error {
 		return err
 	}
 
+	if cmd.JSONOutput {
+		return cmd.UI.DisplayJSON("", map[string][]v7action.ProcessHealthCheck{"app": processHealthChecks})
+	}
+
 	cmd.UI.DisplayNewline()
 
 	if len(processHealthChecks) == 0 {

command/v7/shared/app_summary_displayer.go

@@ -238,3 +238,17 @@ func (display AppSummaryDisplayer) displayBuildpackTable(buildpacks []resources.
 		display.UI.DisplayTableWithHeader("\t", keyValueTable, ui.DefaultTableSpacePadding)
 	}
 }
+
+type AppSummaryJSONDisplayer struct {
+	UI command.UI
+}
+
+func NewAppSummaryJSONDisplayer(ui command.UI) *AppSummaryJSONDisplayer {
+	return &AppSummaryJSONDisplayer{
+		UI: ui,
+	}
+}
+
+func (display AppSummaryJSONDisplayer) AppDisplay(summary v7action.DetailedApplicationSummary, displayStartCommand bool) {
+	display.UI.DisplayJSON("", summary)
+}