create an enum type for status content type

internal/client/statuses.go

@@ -27,7 +27,6 @@ func (g *Client) GetStatus(statusID string) (model.Status, error) {
 
 type CreateStatusForm struct {
 	Content     string                  `json:"status"`
-	ContentType string                 `json:"content_type"`
 	Language    string                  `json:"language"`
 	SpoilerText string                  `json:"spoiler_text"`
 	Boostable   bool                    `json:"boostable"`
@@ -35,6 +34,7 @@ type CreateStatusForm struct {
 	Likeable    bool                    `json:"likeable"`
 	Replyable   bool                    `json:"replyable"`
 	Sensitive   bool                    `json:"sensitive"`
+	ContentType model.StatusContentType `json:"content_type"`
 	Visibility  model.StatusVisibility  `json:"visibility"`
 }
 

internal/executor/create.go

@@ -40,7 +40,7 @@ func NewCreateExecutor(tlf TopLevelFlags, name, summary string) *CreateExecutor
 	createExe.BoolVar(&createExe.replyable, flagReplyable, true, "specify if the status can be replied to")
 	createExe.BoolVar(&createExe.sensitive, flagSensitive, false, "specify if the status should be marked as sensitive")
 	createExe.StringVar(&createExe.content, flagContent, "", "the content of the status to create")
-	createExe.StringVar(&createExe.contentType, flagContentType, "text/plain", "the type that the contents should be parsed from (valid values are plain and markdown)")
+	createExe.StringVar(&createExe.contentType, flagContentType, "plain", "the type that the contents should be parsed from (valid values are plain and markdown)")
 	createExe.StringVar(&createExe.language, flagLanguage, "", "the ISO 639 language code for this status")
 	createExe.StringVar(&createExe.spoilerText, flagSpoilerText, "", "the text to display as the status' warning or subject")
 	createExe.StringVar(&createExe.visibility, flagVisibility, "", "the visibility of the posted status")
@@ -129,9 +129,14 @@ func (c *CreateExecutor) createStatus(gtsClient *client.Client) error {
 		return InvalidStatusVisibilityError{Visibility: visibility}
 	}
 
+	parsedContentType := model.ParseStatusContentType(c.contentType)
+	if parsedContentType == model.StatusContentTypeUnknown {
+		return InvalidStatusContentTypeError{ContentType: c.contentType}
+	}
+
 	form := client.CreateStatusForm{
 		Content:     c.content,
-		ContentType: c.contentType,
+		ContentType: parsedContentType,
 		Language:    language,
 		SpoilerText: c.spoilerText,
 		Boostable:   c.boostable,

internal/executor/errors.go

@@ -59,5 +59,13 @@ type InvalidStatusVisibilityError struct {
 }
 
 func (e InvalidStatusVisibilityError) Error() string {
-	return "'" + e.Visibility + "' is an invalid status visibility value"
+	return "'" + e.Visibility + "' is an invalid status visibility (valid values are public, unlisted, private, mutuals_only and direct)"
+}
+
+type InvalidStatusContentTypeError struct {
+	ContentType string
+}
+
+func (e InvalidStatusContentTypeError) Error() string {
+	return "'" + e.ContentType + "' is an invalid status content type (valid values are plain and markdown)"
 }

internal/model/status.go

@@ -225,8 +225,8 @@ func (s StatusVisibility) String() string {
 	return "unknown"
 }
 
-func ParseStatusVisibility(visibility string) StatusVisibility {
-	switch visibility {
+func ParseStatusVisibility(value string) StatusVisibility {
+	switch value {
 	case "public":
 		return StatusVisibilityPublic
 	case "private":
@@ -265,3 +265,42 @@ func (s *StatusVisibility) UnmarshalJSON(data []byte) error {
 
 	return nil
 }
+
+type StatusContentType int
+
+const (
+	StatusContentTypePlainText StatusContentType = iota
+	StatusContentTypeMarkdown
+	StatusContentTypeUnknown
+)
+
+func (s StatusContentType) String() string {
+	switch s {
+	case StatusContentTypePlainText:
+		return "text/plain"
+	case StatusContentTypeMarkdown:
+		return "text/markdown"
+	}
+
+	return "unknown"
+}
+
+func ParseStatusContentType(value string) StatusContentType {
+	switch value {
+	case "plain", "text/plain":
+		return StatusContentTypePlainText
+	case "markdown", "text/markdown":
+		return StatusContentTypeMarkdown
+	}
+
+	return StatusContentTypeUnknown
+}
+
+func (s StatusContentType) MarshalJSON() ([]byte, error) {
+	value := s.String()
+	if value == "unknown" {
+		return nil, fmt.Errorf("%q is not a valid status content type", value)
+	}
+
+	return json.Marshal(value)
+}