fix: update FlagSet code

- Added constants for flag names and resource types
- Added an error type for when a required flag is not set
- Added an error type for when an unsupported resource type is specified
- Renamed timeline-type to timeline-category

cmd/enbas/create.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"errors"
 	"flag"
 	"fmt"
 
@@ -22,9 +21,9 @@ func newCreateCommand(name, summary string) *createCommand {
 		FlagSet: flag.NewFlagSet(name, flag.ExitOnError),
 	}
 
-	command.StringVar(&command.resourceType, "type", "", "specify the type of resource to create")
+	command.StringVar(&command.resourceType, resourceTypeFlag, "", "specify the type of resource to create")
-	command.StringVar(&command.listTitle, "list-title", "", "specify the title of the list")
+	command.StringVar(&command.listTitle, listTitleFlag, "", "specify the title of the list")
-	command.StringVar(&command.listRepliesPolicy, "list-replies-policy", "list", "specify the policy of the replies for this list (valid values are followed, list and none)")
+	command.StringVar(&command.listRepliesPolicy, listRepliesPolicyFlag, "list", "specify the policy of the replies for this list (valid values are followed, list and none)")
 
 	command.Usage = commandUsageFunc(name, summary, command.FlagSet)
 
@@ -33,7 +32,7 @@ func newCreateCommand(name, summary string) *createCommand {
 
 func (c *createCommand) Execute() error {
 	if c.resourceType == "" {
-		return errors.New("the type field is not set")
+		return flagNotSetError{flagText: resourceTypeFlag}
 	}
 
 	gtsClient, err := client.NewClientFromConfig()
@@ -42,20 +41,20 @@ func (c *createCommand) Execute() error {
 	}
 
 	funcMap := map[string]func(*client.Client) error{
-		"lists": c.createLists,
+		listResource: c.createList,
 	}
 
 	doFunc, ok := funcMap[c.resourceType]
 	if !ok {
-		return fmt.Errorf("unsupported type %q", c.resourceType)
+		return unsupportedResourceTypeError{resourceType: c.resourceType}
 	}
 
 	return doFunc(gtsClient)
 }
 
-func (c *createCommand) createLists(gtsClient *client.Client) error {
+func (c *createCommand) createList(gtsClient *client.Client) error {
 	if c.listTitle == "" {
-		return errors.New("the list-title flag is not set")
+		return flagNotSetError{flagText: listTitleFlag}
 	}
 
 	repliesPolicy, err := model.ParseListRepliesPolicy(c.listRepliesPolicy)

cmd/enbas/delete.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"errors"
 	"flag"
 	"fmt"
 
@@ -20,8 +19,8 @@ func newDeleteCommand(name, summary string) *deleteCommand {
 		FlagSet: flag.NewFlagSet(name, flag.ExitOnError),
 	}
 
-	command.StringVar(&command.resourceType, "type", "", "specify the type of resource to delete")
+	command.StringVar(&command.resourceType, resourceTypeFlag, "", "specify the type of resource to delete")
-	command.StringVar(&command.listID, "list-id", "", "specify the ID of the list to delete")
+	command.StringVar(&command.listID, listIDFlag, "", "specify the ID of the list to delete")
 
 	command.Usage = commandUsageFunc(name, summary, command.FlagSet)
 
@@ -30,7 +29,16 @@ func newDeleteCommand(name, summary string) *deleteCommand {
 
 func (c *deleteCommand) Execute() error {
 	if c.resourceType == "" {
-		return errors.New("the type field is not set")
+		return flagNotSetError{flagText: resourceTypeFlag}
+	}
+
+	funcMap := map[string]func(*client.Client) error{
+		listResource: c.deleteList,
+	}
+
+	doFunc, ok := funcMap[c.resourceType]
+	if !ok {
+		return unsupportedResourceTypeError{resourceType: c.resourceType}
 	}
 
 	gtsClient, err := client.NewClientFromConfig()
@@ -38,21 +46,12 @@ func (c *deleteCommand) Execute() error {
 		return fmt.Errorf("unable to create the GoToSocial client; %w", err)
 	}
 
-	funcMap := map[string]func(*client.Client) error{
-		"lists": c.deleteList,
-	}
-
-	doFunc, ok := funcMap[c.resourceType]
-	if !ok {
-		return fmt.Errorf("unsupported resource type %q", c.resourceType)
-	}
-
 	return doFunc(gtsClient)
 }
 
 func (c *deleteCommand) deleteList(gtsClient *client.Client) error {
 	if c.listID == "" {
-		return errors.New("the list-id flag is not set")
+		return flagNotSetError{flagText: listIDFlag}
 	}
 
 	if err := gtsClient.DeleteList(c.listID); err != nil {

cmd/enbas/errors.go

@@ -0,0 +1,25 @@
+package main
+
+type flagNotSetError struct {
+	flagText string
+}
+
+func (e flagNotSetError) Error() string {
+	return "the flag '" + e.flagText + "' is not set"
+}
+
+type unsupportedResourceTypeError struct {
+	resourceType string
+}
+
+func (e unsupportedResourceTypeError) Error() string {
+	return "unsupported resource type '" + e.resourceType + "'"
+}
+
+type invalidTimelineCategoryError struct {
+	category string
+}
+
+func (e invalidTimelineCategoryError) Error() string {
+	return "'" + e.category + "' is not a valid timeline category (please choose home, public, tag or list)"
+}

cmd/enbas/login.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"errors"
 	"flag"
 	"fmt"
 	"strings"
@@ -16,15 +15,13 @@ type loginCommand struct {
 	instance string
 }
 
-var errInstanceNotSet = errors.New("the instance flag is not set")
-
 func newLoginCommand(name, summary string) *loginCommand {
 	command := loginCommand{
 		FlagSet:  flag.NewFlagSet(name, flag.ExitOnError),
 		instance: "",
 	}
 
-	command.StringVar(&command.instance, "instance", "", "specify the instance that you want to login to.")
+	command.StringVar(&command.instance, instanceFlag, "", "specify the instance that you want to login to.")
 
 	command.Usage = commandUsageFunc(name, summary, command.FlagSet)
 
@@ -35,7 +32,7 @@ func (c *loginCommand) Execute() error {
 	var err error
 
 	if c.instance == "" {
-		return errInstanceNotSet
+		return flagNotSetError{flagText: instanceFlag}
 	}
 
 	instance := c.instance

cmd/enbas/main.go

@@ -6,6 +6,29 @@ import (
 	"os"
 )
 
+const (
+	accountFlag           = "account"
+	instanceFlag          = "instance"
+	listIDFlag            = "list-id"
+	listTitleFlag         = "list-title"
+	listRepliesPolicyFlag = "list-replies-policy"
+	myAccountFlag         = "my-account"
+	resourceTypeFlag      = "type"
+	statusIDFlag          = "status-id"
+	tagFlag               = "tag"
+	timelineCategoryFlag  = "timeline-category"
+	timelineLimitFlag     = "timeline-limit"
+	toAccountFlag         = "to-account"
+)
+
+const (
+	accountResource  = "account"
+	instanceResource = "instance"
+	listResource     = "list"
+	statusResource   = "status"
+	timelineResource = "timeline"
+)
+
 type Executor interface {
 	Name() string
 	Parse(args []string) error

cmd/enbas/show.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"errors"
 	"flag"
 	"fmt"
 
@@ -13,14 +12,14 @@ import (
 
 type showCommand struct {
 	*flag.FlagSet
-	myAccount       bool
+	myAccount        bool
-	resourceType    string
+	resourceType     string
-	account         string
+	account          string
-	statusID        string
+	statusID         string
-	timelineType    string
+	timelineCategory string
-	timelineListID  string
+	listID           string
-	timelineTagName string
+	tag              string
-	timelineLimit   int
+	timelineLimit    int
 }
 
 func newShowCommand(name, summary string) *showCommand {
@@ -28,14 +27,15 @@ func newShowCommand(name, summary string) *showCommand {
 		FlagSet: flag.NewFlagSet(name, flag.ExitOnError),
 	}
 
-	command.BoolVar(&command.myAccount, "my-account", false, "set to true to lookup your account")
+	command.BoolVar(&command.myAccount, myAccountFlag, false, "set to true to lookup your account")
-	command.StringVar(&command.resourceType, "type", "", "specify the type of resource to display")
+	command.StringVar(&command.resourceType, resourceTypeFlag, "", "specify the type of resource to display")
-	command.StringVar(&command.account, "account", "", "specify the account URI to lookup")
+	command.StringVar(&command.account, accountFlag, "", "specify the account URI to lookup")
-	command.StringVar(&command.statusID, "status-id", "", "specify the ID of the status to display")
+	command.StringVar(&command.statusID, statusIDFlag, "", "specify the ID of the status to display")
-	command.StringVar(&command.timelineType, "timeline-type", "home", "specify the type of timeline to display (valid values are home, public, list and tag)")
+	command.StringVar(&command.timelineCategory, timelineCategoryFlag, "home", "specify the type of timeline to display (valid values are home, public, list and tag)")
-	command.StringVar(&command.timelineListID, "timeline-list-id", "", "specify the ID of the list timeline to display")
+	command.StringVar(&command.listID, listIDFlag, "", "specify the ID of the list to display")
-	command.StringVar(&command.timelineTagName, "timeline-tag-name", "", "specify the name of the tag timeline to display")
+	command.StringVar(&command.tag, tagFlag, "", "specify the name of the tag to use")
-	command.IntVar(&command.timelineLimit, "timeline-limit", 5, "specify the number of statuses to display")
+	command.IntVar(&command.timelineLimit, timelineLimitFlag, 5, "specify the number of statuses to display")
+
 	command.Usage = commandUsageFunc(name, summary, command.FlagSet)
 
 	return &command
@@ -43,7 +43,20 @@ func newShowCommand(name, summary string) *showCommand {
 
 func (c *showCommand) Execute() error {
 	if c.resourceType == "" {
-		return errors.New("the type field is not set")
+		return flagNotSetError{flagText: resourceTypeFlag}
+	}
+
+	funcMap := map[string]func(*client.Client) error{
+		instanceResource: c.showInstance,
+		accountResource:  c.showAccount,
+		statusResource:   c.showStatus,
+		timelineResource: c.showTimeline,
+		listResource:     c.showLists,
+	}
+
+	doFunc, ok := funcMap[c.resourceType]
+	if !ok {
+		return unsupportedResourceTypeError{resourceType: c.resourceType}
 	}
 
 	gtsClient, err := client.NewClientFromConfig()
@@ -51,19 +64,6 @@ func (c *showCommand) Execute() error {
 		return fmt.Errorf("unable to create the GoToSocial client; %w", err)
 	}
 
-	funcMap := map[string]func(*client.Client) error{
-		"instance": c.showInstance,
-		"account":  c.showAccount,
-		"status":   c.showStatus,
-		"timeline": c.showTimeline,
-		"lists":    c.showLists,
-	}
-
-	doFunc, ok := funcMap[c.resourceType]
-	if !ok {
-		return fmt.Errorf("unsupported resource type %q", c.resourceType)
-	}
-
 	return doFunc(gtsClient)
 }
 
@@ -90,7 +90,7 @@ func (c *showCommand) showAccount(gts *client.Client) error {
 		accountURI = authConfig.CurrentAccount
 	} else {
 		if c.account == "" {
-			return errors.New("the account flag is not set")
+			return flagNotSetError{flagText: accountFlag}
 		}
 
 		accountURI = c.account
@@ -108,7 +108,7 @@ func (c *showCommand) showAccount(gts *client.Client) error {
 
 func (c *showCommand) showStatus(gts *client.Client) error {
 	if c.statusID == "" {
-		return errors.New("the status-id flag is not set")
+		return flagNotSetError{flagText: statusIDFlag}
 	}
 
 	status, err := gts.GetStatus(c.statusID)
@@ -127,29 +127,29 @@ func (c *showCommand) showTimeline(gts *client.Client) error {
 		err      error
 	)
 
-	switch c.timelineType {
+	switch c.timelineCategory {
 	case "home":
 		timeline, err = gts.GetHomeTimeline(c.timelineLimit)
 	case "public":
 		timeline, err = gts.GetPublicTimeline(c.timelineLimit)
 	case "list":
-		if c.timelineListID == "" {
+		if c.listID == "" {
-			return errors.New("the timeline-list-id flag is not set")
+			return flagNotSetError{flagText: listIDFlag}
 		}
 
-		timeline, err = gts.GetListTimeline(c.timelineListID, c.timelineLimit)
+		timeline, err = gts.GetListTimeline(c.listID, c.timelineLimit)
 	case "tag":
-		if c.timelineTagName == "" {
+		if c.tag == "" {
-			return errors.New("the timeline-tag-name flag is not set")
+			return flagNotSetError{flagText: tagFlag}
 		}
 
-		timeline, err = gts.GetTagTimeline(c.timelineTagName, c.timelineLimit)
+		timeline, err = gts.GetTagTimeline(c.tag, c.timelineLimit)
 	default:
-		return fmt.Errorf("%q is not a valid type of timeline", c.timelineType)
+		return invalidTimelineCategoryError{category: c.timelineCategory}
 	}
 
 	if err != nil {
-		return fmt.Errorf("unable to retrieve the %s timeline; %w", c.timelineType, err)
+		return fmt.Errorf("unable to retrieve the %s timeline; %w", c.timelineCategory, err)
 	}
 
 	if len(timeline.Statuses) == 0 {

cmd/enbas/switch.go

@@ -18,13 +18,18 @@ func newSwitchCommand(name, summary string) *switchCommand {
 		toAccount: "",
 	}
 
-	command.StringVar(&command.toAccount, "to-account", "", "the account to switch to")
+	command.StringVar(&command.toAccount, toAccountFlag, "", "the account to switch to")
+
 	command.Usage = commandUsageFunc(name, summary, command.FlagSet)
 
 	return &command
 }
 
 func (c *switchCommand) Execute() error {
+	if c.toAccount == "" {
+		return flagNotSetError{flagText: toAccountFlag}
+	}
+
 	if err := config.UpdateCurrentAccount(c.toAccount); err != nil {
 		return fmt.Errorf("unable to switch accounts; %w", err)
 	}

cmd/enbas/update.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"errors"
 	"flag"
 	"fmt"
 
@@ -23,10 +22,10 @@ func newUpdateCommand(name, summary string) *updateCommand {
 		FlagSet: flag.NewFlagSet(name, flag.ExitOnError),
 	}
 
-	command.StringVar(&command.resourceType, "type", "", "specify the type of resource to update")
+	command.StringVar(&command.resourceType, resourceTypeFlag, "", "specify the type of resource to update")
-	command.StringVar(&command.listID, "list-id", "", "specify the ID of the list to update")
+	command.StringVar(&command.listID, listIDFlag, "", "specify the ID of the list to update")
-	command.StringVar(&command.listTitle, "list-title", "", "specify the title of the list")
+	command.StringVar(&command.listTitle, listTitleFlag, "", "specify the title of the list")
-	command.StringVar(&command.listRepliesPolicy, "list-replies-policy", "", "specify the policy of the replies for this list (valid values are followed, list and none)")
+	command.StringVar(&command.listRepliesPolicy, listRepliesPolicyFlag, "", "specify the policy of the replies for this list (valid values are followed, list and none)")
 
 	command.Usage = commandUsageFunc(name, summary, command.FlagSet)
 
@@ -35,7 +34,16 @@ func newUpdateCommand(name, summary string) *updateCommand {
 
 func (c *updateCommand) Execute() error {
 	if c.resourceType == "" {
-		return errors.New("the type field is not set")
+		return flagNotSetError{flagText: resourceTypeFlag}
+	}
+
+	funcMap := map[string]func(*client.Client) error{
+		listResource: c.updateList,
+	}
+
+	doFunc, ok := funcMap[c.resourceType]
+	if !ok {
+		return unsupportedResourceTypeError{resourceType: c.resourceType}
 	}
 
 	gtsClient, err := client.NewClientFromConfig()
@@ -43,21 +51,12 @@ func (c *updateCommand) Execute() error {
 		return fmt.Errorf("unable to create the GoToSocial client; %w", err)
 	}
 
-	funcMap := map[string]func(*client.Client) error{
-		"lists": c.updateList,
-	}
-
-	doFunc, ok := funcMap[c.resourceType]
-	if !ok {
-		return fmt.Errorf("unsupported resource type %q", c.resourceType)
-	}
-
 	return doFunc(gtsClient)
 }
 
 func (c *updateCommand) updateList(gtsClient *client.Client) error {
 	if c.listID == "" {
-		return errors.New("the list-id flag is not set")
+		return flagNotSetError{flagText: listIDFlag}
 	}
 
 	list, err := gtsClient.GetList(c.listID)