refactor to simplify main

cmd/jira/main.go

@@ -3,34 +3,19 @@ package main
 import (
 	"fmt"
 	"os"
-	"os/exec"
 	"path/filepath"
-	"regexp"
-	"runtime"
 	"runtime/debug"
-	"strconv"
-	"syscall"
 
 	"github.com/coryb/figtree"
-	"github.com/coryb/kingpeon"
 	"github.com/coryb/oreo"
 
-	jira "gopkg.in/Netflix-Skunkworks/go-jira.v1"
 	"gopkg.in/Netflix-Skunkworks/go-jira.v1/jiracli"
 	"gopkg.in/Netflix-Skunkworks/go-jira.v1/jiracmd"
-	kingpin "gopkg.in/alecthomas/kingpin.v2"
 	"gopkg.in/op/go-logging.v1"
 )
 
 var (
 	log = logging.MustGetLogger("jira")
-	defaultFormat = func() string {
-		format := os.Getenv("JIRA_LOG_FORMAT")
-		if format != "" {
-			return format
-		}
-		return "%{color}%{level:-5s}%{color:reset} %{message}"
-	}()
 )
 
 func handleExit() {
@@ -44,138 +29,10 @@ func handleExit() {
 	}
 }
 
-func increaseLogLevel(verbosity int) {
-	logging.SetLevel(logging.GetLevel("")+logging.Level(verbosity), "")
-	if logging.GetLevel("") > logging.DEBUG {
-		oreo.TraceRequestBody = true
-		oreo.TraceResponseBody = true
-	}
-}
-
-var usage = `{{define "FormatCommand"}}\
-{{if .FlagSummary}} {{.FlagSummary}}{{end}}\
-{{range .Args}} {{if not .Required}}[{{end}}<{{.Name}}>{{if .Value|IsCumulative}}...{{end}}{{if not .Required}}]{{end}}{{end}}\
-{{end}}\
-
-{{define "FormatBriefCommands"}}\
-{{range .FlattenedCommands}}\
-{{if not .Hidden}}\
-  {{ print .FullCommand ":" | printf "%-20s"}} {{.Help}}
-{{end}}\
-{{end}}\
-{{end}}\
-
-{{define "FormatCommands"}}\
-{{range .FlattenedCommands}}\
-{{if not .Hidden}}\
-  {{.FullCommand}}{{if .Default}}*{{end}}{{template "FormatCommand" .}}
-{{.Help|Wrap 4}}
-{{with .Flags|FlagsToTwoColumns}}{{FormatTwoColumnsWithIndent . 4 2}}{{end}}
-{{end}}\
-{{end}}\
-{{end}}\
-
-{{define "FormatUsage"}}\
-{{template "FormatCommand" .}}{{if .Commands}} <command> [<args> ...]{{end}}
-{{if .Help}}
-{{.Help|Wrap 0}}\
-{{end}}\
-
-{{end}}\
-
-{{if .Context.SelectedCommand}}\
-usage: {{.App.Name}} {{.Context.SelectedCommand}}{{template "FormatCommand" .Context.SelectedCommand}}
-{{if .Context.SelectedCommand.Aliases }}\
-{{range $top := .App.Commands}}\
-{{if eq $top.FullCommand $.Context.SelectedCommand.FullCommand}}\
-{{range $alias := $.Context.SelectedCommand.Aliases}}\
-alias: {{$.App.Name}} {{$alias}}{{template "FormatCommand" $.Context.SelectedCommand}}
-{{end}}\
-{{else}}\
-{{range $sub := $top.Commands}}\
-{{if eq $sub.FullCommand $.Context.SelectedCommand.FullCommand}}\
-{{range $alias := $.Context.SelectedCommand.Aliases}}\
-alias: {{$.App.Name}} {{$top.Name}} {{$alias}}{{template "FormatCommand" $.Context.SelectedCommand}}
-{{end}}\
-{{end}}\
-{{end}}\
-{{end}}\
-{{end}}\
-{{end}}
-{{if .Context.SelectedCommand.Help}}\
-{{.Context.SelectedCommand.Help|Wrap 0}}
-{{end}}\
-{{else}}\
-usage: {{.App.Name}}{{template "FormatUsage" .App}}
-{{end}}\
-
-{{if .App.Flags}}\
-Global flags:
-{{.App.Flags|FlagsToTwoColumns|FormatTwoColumns}}
-{{end}}\
-{{if .Context.SelectedCommand}}\
-{{if and .Context.SelectedCommand.Flags|RequiredFlags}}\
-Required flags:
-{{.Context.SelectedCommand.Flags|RequiredFlags|FlagsToTwoColumns|FormatTwoColumns}}
-{{end}}\
-{{if .Context.SelectedCommand.Flags|OptionalFlags}}\
-Optional flags:
-{{.Context.SelectedCommand.Flags|OptionalFlags|FlagsToTwoColumns|FormatTwoColumns}}
-{{end}}\
-{{end}}\
-{{if .Context.Args}}\
-Args:
-{{.Context.Args|ArgsToTwoColumns|FormatTwoColumns}}
-{{end}}\
-{{if .Context.SelectedCommand}}\
-{{if .Context.SelectedCommand.Commands}}\
-Subcommands:
-{{template "FormatCommands" .Context.SelectedCommand}}
-{{end}}\
-{{else if .App.Commands}}\
-Commands:
-{{template "FormatBriefCommands" .App}}
-{{end}}\
-`
-
 func main() {
 	defer handleExit()
-	logBackend := logging.NewLogBackend(os.Stderr, "", 0)
-	format := os.Getenv("JIRA_LOG_FORMAT")
-	if format == "" {
-		format = defaultFormat
-	}
-	logging.SetBackend(
-		logging.NewBackendFormatter(
-			logBackend,
-			logging.MustStringFormatter(format),
-		),
-	)
-	if os.Getenv("JIRA_DEBUG") == "" {
-		logging.SetLevel(logging.NOTICE, "")
-	} else {
-		logging.SetLevel(logging.DEBUG, "")
-	}
 
-	app := kingpin.New("jira", "Jira Command Line Interface")
+	jiracli.InitLogging()
-	app.Command("version", "Prints version").PreAction(func(*kingpin.ParseContext) error {
-		fmt.Println(jira.VERSION)
-		panic(jiracli.Exit{Code: 0})
-	})
-	app.UsageTemplate(usage)
-
-	var verbosity int
-	app.Flag("verbose", "Increase verbosity for debugging").Short('v').PreAction(func(_ *kingpin.ParseContext) error {
-		os.Setenv("JIRA_DEBUG", fmt.Sprintf("%d", verbosity))
-		increaseLogLevel(1)
-		return nil
-	}).CounterVar(&verbosity)
-
-	if os.Getenv("JIRA_DEBUG") != "" {
-		if verbosity, err := strconv.Atoi(os.Getenv("JIRA_DEBUG")); err == nil {
-			increaseLogLevel(verbosity)
-		}
-	}
 
 	fig := figtree.NewFigTree()
 	fig.EnvPrefix = "JIRA"
@@ -188,135 +45,8 @@ func main() {
 
 	o := oreo.New().WithCookieFile(filepath.Join(jiracli.Homedir(), fig.ConfigDir, "cookies.js"))
 
-	registry := []jiracli.CommandRegistry{
+	jiracmd.RegisterAllCommands()
-		{Command: "acknowledge", Entry: jiracmd.CmdTransitionRegistry("acknowledge"), Aliases: []string{"ack"}},
-		{Command: "assign", Entry: jiracmd.CmdAssignRegistry(), Aliases: []string{"give"}},
-		{Command: "attach create", Entry: jiracmd.CmdAttachCreateRegistry()},
-		{Command: "attach get", Entry: jiracmd.CmdAttachGetRegistry()},
-		{Command: "attach list", Entry: jiracmd.CmdAttachListRegistry(), Aliases: []string{"ls"}},
-		{Command: "attach remove", Entry: jiracmd.CmdAttachRemoveRegistry(), Aliases: []string{"rm"}},
-		{Command: "backlog", Entry: jiracmd.CmdTransitionRegistry("Backlog")},
-		{Command: "block", Entry: jiracmd.CmdBlockRegistry()},
-		{Command: "browse", Entry: jiracmd.CmdBrowseRegistry(), Aliases: []string{"b"}},
-		{Command: "close", Entry: jiracmd.CmdTransitionRegistry("close")},
-		{Command: "comment", Entry: jiracmd.CmdCommentRegistry()},
-		{Command: "component add", Entry: jiracmd.CmdComponentAddRegistry()},
-		{Command: "components", Entry: jiracmd.CmdComponentsRegistry()},
-		{Command: "create", Entry: jiracmd.CmdCreateRegistry()},
-		{Command: "createmeta", Entry: jiracmd.CmdCreateMetaRegistry()},
-		{Command: "done", Entry: jiracmd.CmdTransitionRegistry("Done")},
-		{Command: "dup", Entry: jiracmd.CmdDupRegistry()},
-		{Command: "edit", Entry: jiracmd.CmdEditRegistry()},
-		{Command: "editmeta", Entry: jiracmd.CmdEditMetaRegistry()},
-		{Command: "epic add", Entry: jiracmd.CmdEpicAddRegistry()},
-		{Command: "epic create", Entry: jiracmd.CmdEpicCreateRegistry()},
-		{Command: "epic list", Entry: jiracmd.CmdEpicListRegistry(), Aliases: []string{"ls"}},
-		{Command: "epic remove", Entry: jiracmd.CmdEpicRemoveRegistry(), Aliases: []string{"rm"}},
-		{Command: "export-templates", Entry: jiracmd.CmdExportTemplatesRegistry()},
-		{Command: "fields", Entry: jiracmd.CmdFieldsRegistry()},
-		{Command: "in-progress", Entry: jiracmd.CmdTransitionRegistry("Progress"), Aliases: []string{"prog", "progress"}},
-		{Command: "issuelink", Entry: jiracmd.CmdIssueLinkRegistry()},
-		{Command: "issuelinktypes", Entry: jiracmd.CmdIssueLinkTypesRegistry()},
-		{Command: "issuetypes", Entry: jiracmd.CmdIssueTypesRegistry()},
-		{Command: "labels add", Entry: jiracmd.CmdLabelsAddRegistry()},
-		{Command: "labels remove", Entry: jiracmd.CmdLabelsRemoveRegistry(), Aliases: []string{"rm"}},
-		{Command: "labels set", Entry: jiracmd.CmdLabelsSetRegistry()},
-		{Command: "list", Entry: jiracmd.CmdListRegistry(), Aliases: []string{"ls"}},
-		{Command: "login", Entry: jiracmd.CmdLoginRegistry()},
-		{Command: "logout", Entry: jiracmd.CmdLogoutRegistry()},
-		{Command: "rank", Entry: jiracmd.CmdRankRegistry()},
-		{Command: "reopen", Entry: jiracmd.CmdTransitionRegistry("reopen")},
-		{Command: "request", Entry: jiracmd.CmdRequestRegistry(), Aliases: []string{"req"}},
-		{Command: "resolve", Entry: jiracmd.CmdTransitionRegistry("resolve")},
-		{Command: "start", Entry: jiracmd.CmdTransitionRegistry("start")},
-		{Command: "stop", Entry: jiracmd.CmdTransitionRegistry("stop")},
-		{Command: "subtask", Entry: jiracmd.CmdSubtaskRegistry()},
-		{Command: "take", Entry: jiracmd.CmdTakeRegistry()},
-		{Command: "todo", Entry: jiracmd.CmdTransitionRegistry("To Do")},
-		{Command: "transition", Entry: jiracmd.CmdTransitionRegistry(""), Aliases: []string{"trans"}},
-		{Command: "transitions", Entry: jiracmd.CmdTransitionsRegistry("transitions")},
-		{Command: "transmeta", Entry: jiracmd.CmdTransitionsRegistry("debug")},
-		{Command: "unassign", Entry: jiracmd.CmdUnassignRegistry()},
-		{Command: "unexport-templates", Entry: jiracmd.CmdUnexportTemplatesRegistry()},
-		{Command: "view", Entry: jiracmd.CmdViewRegistry()},
-		{Command: "vote", Entry: jiracmd.CmdVoteRegistry()},
-		{Command: "watch", Entry: jiracmd.CmdWatchRegistry()},
-		{Command: "worklog add", Entry: jiracmd.CmdWorklogAddRegistry()},
-		{Command: "worklog list", Entry: jiracmd.CmdWorklogListRegistry(), Default: true},
-	}
 
-	jiracli.Register(app, o, fig, registry)
+	app := jiracli.CommandLine(fig, o)
-
+	jiracli.ParseCommandLine(app, os.Args[1:])
-	// register custom commands
-	data := struct {
-		CustomCommands kingpeon.DynamicCommands `yaml:"custom-commands" json:"custom-commands"`
-	}{}
-
-	if err := fig.LoadAllConfigs("config.yml", &data); err != nil {
-		log.Errorf("%s", err)
-		panic(jiracli.Exit{Code: 1})
-	}
-
-	if len(data.CustomCommands) > 0 {
-		runner := syscall.Exec
-		if runtime.GOOS == "windows" {
-			runner = func(binary string, cmd []string, env []string) error {
-				command := exec.Command(binary, cmd[1:]...)
-				command.Stdin = os.Stdin
-				command.Stdout = os.Stdout
-				command.Stderr = os.Stderr
-				command.Env = env
-				return command.Run()
-			}
-		}
-
-		tmp := map[string]interface{}{}
-		fig.LoadAllConfigs("config.yml", &tmp)
-		kingpeon.RegisterDynamicCommandsWithRunner(runner, app, data.CustomCommands, jiracli.TemplateProcessor())
-	}
-
-	app.Terminate(func(status int) {
-		for _, arg := range os.Args {
-			if arg == "-h" || arg == "--help" || len(os.Args) == 1 {
-				panic(jiracli.Exit{Code: 0})
-			}
-		}
-		panic(jiracli.Exit{Code: 1})
-	})
-
-	// checking for default usage of `jira ISSUE-123` but need to allow
-	// for global options first like: `jira --user mothra ISSUE-123`
-	ctx, err := app.ParseContext(os.Args[1:])
-	if err != nil && ctx == nil {
-		// This is an internal kingpin usage error, duplicate options/commands
-		log.Fatalf("error: %s, ctx: %v", err, ctx)
-	}
-
-	if ctx != nil {
-		if ctx.SelectedCommand == nil {
-			next := ctx.Next()
-			if next != nil {
-				if ok, err := regexp.MatchString("^[A-Z]+-[0-9]+$", next.Value); err != nil {
-					log.Errorf("Invalid Regex: %s", err)
-				} else if ok {
-					// insert "view" at i=1 (2nd position)
-					os.Args = append(os.Args[:1], append([]string{"view"}, os.Args[1:]...)...)
-				}
-			}
-		}
-	}
-
-	if _, err := app.Parse(os.Args[1:]); err != nil {
-		if _, ok := err.(*jiracli.Error); ok {
-			log.Errorf("%s", err)
-			panic(jiracli.Exit{Code: 1})
-		} else {
-			ctx, _ := app.ParseContext(os.Args[1:])
-			if ctx != nil {
-				app.UsageForContext(ctx)
-			}
-			log.Errorf("Invalid Usage: %s", err)
-			panic(jiracli.Exit{Code: 1})
-		}
-	}
 }

jiracli/cli.go

@@ -20,11 +20,8 @@ import (
 	"gopkg.in/AlecAivazis/survey.v1"
 	kingpin "gopkg.in/alecthomas/kingpin.v2"
 	yaml "gopkg.in/coryb/yaml.v2"
-	logging "gopkg.in/op/go-logging.v1"
 )
 
-var log = logging.MustGetLogger("jira")
-
 type Exit struct {
 	Code int
 }
@@ -66,7 +63,13 @@ type kingpinAppOrCommand interface {
 	GetCommand(string) *kingpin.CmdClause
 }
 
-func Register(app *kingpin.Application, o *oreo.Client, fig *figtree.FigTree, reg []CommandRegistry) {
+var globalCommandRegistry = []CommandRegistry{}
+
+func RegisterCommand(regEntry CommandRegistry) {
+	globalCommandRegistry = append(globalCommandRegistry, regEntry)
+}
+
+func register(app *kingpin.Application, o *oreo.Client, fig *figtree.FigTree) {
 	globals := GlobalOptions{
 		User: figtree.NewStringOption(os.Getenv("USER")),
 	}
@@ -98,7 +101,7 @@ func Register(app *kingpin.Application, o *oreo.Client, fig *figtree.FigTree, re
 		},
 	)
 
-	for _, command := range reg {
+	for _, command := range globalCommandRegistry {
 		copy := command
 		commandFields := strings.Fields(copy.Command)
 		var appOrCmd kingpinAppOrCommand = app

jiracli/log.go

@@ -0,0 +1,43 @@
+package jiracli
+
+import (
+	"os"
+	"strconv"
+
+	"github.com/coryb/oreo"
+	logging "gopkg.in/op/go-logging.v1"
+)
+
+var (
+	log = logging.MustGetLogger("jira")
+)
+
+func IncreaseLogLevel(verbosity int) {
+	logging.SetLevel(logging.GetLevel("")+logging.Level(verbosity), "")
+	if logging.GetLevel("") > logging.DEBUG {
+		oreo.TraceRequestBody = true
+		oreo.TraceResponseBody = true
+	}
+}
+
+func InitLogging() {
+	logBackend := logging.NewLogBackend(os.Stderr, "", 0)
+	format := os.Getenv("JIRA_LOG_FORMAT")
+	if format == "" {
+		format = "%{color}%{level:-5s}%{color:reset} %{message}"
+	}
+	logging.SetBackend(
+		logging.NewBackendFormatter(
+			logBackend,
+			logging.MustStringFormatter(format),
+		),
+	)
+	if os.Getenv("JIRA_DEBUG") == "" {
+		logging.SetLevel(logging.NOTICE, "")
+	} else {
+		logging.SetLevel(logging.DEBUG, "")
+		if verbosity, err := strconv.Atoi(os.Getenv("JIRA_DEBUG")); err == nil {
+			IncreaseLogLevel(verbosity)
+		}
+	}
+}

jiracli/usage.go

@@ -0,0 +1,198 @@
+package jiracli
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"regexp"
+	"runtime"
+	"syscall"
+
+	"github.com/coryb/figtree"
+	"github.com/coryb/kingpeon"
+	"github.com/coryb/oreo"
+	jira "gopkg.in/Netflix-Skunkworks/go-jira.v1"
+	kingpin "gopkg.in/alecthomas/kingpin.v2"
+)
+
+var usage = `{{define "FormatCommand"}}\
+{{if .FlagSummary}} {{.FlagSummary}}{{end}}\
+{{range .Args}} {{if not .Required}}[{{end}}<{{.Name}}>{{if .Value|IsCumulative}}...{{end}}{{if not .Required}}]{{end}}{{end}}\
+{{end}}\
+
+{{define "FormatBriefCommands"}}\
+{{range .FlattenedCommands}}\
+{{if not .Hidden}}\
+  {{ print .FullCommand ":" | printf "%-20s"}} {{.Help}}
+{{end}}\
+{{end}}\
+{{end}}\
+
+{{define "FormatCommands"}}\
+{{range .FlattenedCommands}}\
+{{if not .Hidden}}\
+  {{.FullCommand}}{{if .Default}}*{{end}}{{template "FormatCommand" .}}
+{{.Help|Wrap 4}}
+{{with .Flags|FlagsToTwoColumns}}{{FormatTwoColumnsWithIndent . 4 2}}{{end}}
+{{end}}\
+{{end}}\
+{{end}}\
+
+{{define "FormatUsage"}}\
+{{template "FormatCommand" .}}{{if .Commands}} <command> [<args> ...]{{end}}
+{{if .Help}}
+{{.Help|Wrap 0}}\
+{{end}}\
+
+{{end}}\
+
+{{if .Context.SelectedCommand}}\
+usage: {{.App.Name}} {{.Context.SelectedCommand}}{{template "FormatCommand" .Context.SelectedCommand}}
+{{if .Context.SelectedCommand.Aliases }}\
+{{range $top := .App.Commands}}\
+{{if eq $top.FullCommand $.Context.SelectedCommand.FullCommand}}\
+{{range $alias := $.Context.SelectedCommand.Aliases}}\
+alias: {{$.App.Name}} {{$alias}}{{template "FormatCommand" $.Context.SelectedCommand}}
+{{end}}\
+{{else}}\
+{{range $sub := $top.Commands}}\
+{{if eq $sub.FullCommand $.Context.SelectedCommand.FullCommand}}\
+{{range $alias := $.Context.SelectedCommand.Aliases}}\
+alias: {{$.App.Name}} {{$top.Name}} {{$alias}}{{template "FormatCommand" $.Context.SelectedCommand}}
+{{end}}\
+{{end}}\
+{{end}}\
+{{end}}\
+{{end}}\
+{{end}}
+{{if .Context.SelectedCommand.Help}}\
+{{.Context.SelectedCommand.Help|Wrap 0}}
+{{end}}\
+{{else}}\
+usage: {{.App.Name}}{{template "FormatUsage" .App}}
+{{end}}\
+
+{{if .App.Flags}}\
+Global flags:
+{{.App.Flags|FlagsToTwoColumns|FormatTwoColumns}}
+{{end}}\
+{{if .Context.SelectedCommand}}\
+{{if and .Context.SelectedCommand.Flags|RequiredFlags}}\
+Required flags:
+{{.Context.SelectedCommand.Flags|RequiredFlags|FlagsToTwoColumns|FormatTwoColumns}}
+{{end}}\
+{{if .Context.SelectedCommand.Flags|OptionalFlags}}\
+Optional flags:
+{{.Context.SelectedCommand.Flags|OptionalFlags|FlagsToTwoColumns|FormatTwoColumns}}
+{{end}}\
+{{end}}\
+{{if .Context.Args}}\
+Args:
+{{.Context.Args|ArgsToTwoColumns|FormatTwoColumns}}
+{{end}}\
+{{if .Context.SelectedCommand}}\
+{{if .Context.SelectedCommand.Commands}}\
+Subcommands:
+{{template "FormatCommands" .Context.SelectedCommand}}
+{{end}}\
+{{else if .App.Commands}}\
+Commands:
+{{template "FormatBriefCommands" .App}}
+{{end}}\
+`
+
+func CommandLine(fig *figtree.FigTree, o *oreo.Client) *kingpin.Application {
+	app := kingpin.New("jira", "Jira Command Line Interface")
+
+	app.Command("version", "Prints version").PreAction(func(*kingpin.ParseContext) error {
+		fmt.Println(jira.VERSION)
+		panic(Exit{Code: 0})
+	})
+	app.UsageTemplate(usage)
+
+	var verbosity int
+	app.Flag("verbose", "Increase verbosity for debugging").Short('v').PreAction(func(_ *kingpin.ParseContext) error {
+		os.Setenv("JIRA_DEBUG", fmt.Sprintf("%d", verbosity))
+		IncreaseLogLevel(1)
+		return nil
+	}).CounterVar(&verbosity)
+
+	app.Terminate(func(status int) {
+		for _, arg := range os.Args {
+			if arg == "-h" || arg == "--help" || len(os.Args) == 1 {
+				panic(Exit{Code: 0})
+			}
+		}
+		panic(Exit{Code: 1})
+	})
+
+	register(app, o, fig)
+
+	// register custom commands
+	data := struct {
+		CustomCommands kingpeon.DynamicCommands `yaml:"custom-commands" json:"custom-commands"`
+	}{}
+
+	if err := fig.LoadAllConfigs("config.yml", &data); err != nil {
+		log.Errorf("%s", err)
+		panic(Exit{Code: 1})
+	}
+
+	if len(data.CustomCommands) > 0 {
+		runner := syscall.Exec
+		if runtime.GOOS == "windows" {
+			runner = func(binary string, cmd []string, env []string) error {
+				command := exec.Command(binary, cmd[1:]...)
+				command.Stdin = os.Stdin
+				command.Stdout = os.Stdout
+				command.Stderr = os.Stderr
+				command.Env = env
+				return command.Run()
+			}
+		}
+
+		tmp := map[string]interface{}{}
+		fig.LoadAllConfigs("config.yml", &tmp)
+		kingpeon.RegisterDynamicCommandsWithRunner(runner, app, data.CustomCommands, TemplateProcessor())
+	}
+
+	return app
+}
+
+func ParseCommandLine(app *kingpin.Application, args []string) {
+	// checking for default usage of `jira ISSUE-123` but need to allow
+	// for global options first like: `jira --user mothra ISSUE-123`
+	ctx, err := app.ParseContext(args)
+	if err != nil && ctx == nil {
+		// This is an internal kingpin usage error, duplicate options/commands
+		log.Fatalf("error: %s, ctx: %v", err, ctx)
+	}
+
+	if ctx != nil {
+		if ctx.SelectedCommand == nil {
+			next := ctx.Next()
+			if next != nil {
+				if ok, err := regexp.MatchString("^[A-Z]+-[0-9]+$", next.Value); err != nil {
+					log.Errorf("Invalid Regex: %s", err)
+				} else if ok {
+					// insert "view" at i=1 (2nd position)
+					os.Args = append(os.Args[:1], append([]string{"view"}, os.Args[1:]...)...)
+				}
+			}
+		}
+	}
+
+	if _, err := app.Parse(os.Args[1:]); err != nil {
+		if _, ok := err.(*Error); ok {
+			log.Errorf("%s", err)
+			panic(Exit{Code: 1})
+		} else {
+			ctx, _ := app.ParseContext(os.Args[1:])
+			if ctx != nil {
+				app.UsageForContext(ctx)
+			}
+			log.Errorf("Invalid Usage: %s", err)
+			panic(Exit{Code: 1})
+		}
+	}
+}