Use serde default on struct!

src/config.rs

@@ -18,11 +18,10 @@ pub struct Email {
 }
 
 /// UTC offset for time formatting.
-#[derive(Deserialize)]
+#[derive(Deserialize, Default)]
+#[serde(default)]
 pub struct UtcOffset {
-    #[serde(default)]
     pub hours: i8,
-    #[serde(default)]
     pub minutes: i8,
 }
 
@@ -42,105 +41,103 @@ pub struct CustomField {
     pub field_type: CustomFieldType,
 }
 
-fn default_captcha_error() -> String {
-    "You did enter the wrong code at the end of the form. Please try again.".to_string()
-}
-fn default_email_error() -> String {
-    "An internal error occurred while sending your request. Please try again later.".to_string()
-}
 /// Error messages for localization.
 #[derive(Deserialize)]
+#[serde(default)]
 pub struct ErrorMessages {
-    #[serde(default = "default_captcha_error")]
     pub captcha_error: String,
-    #[serde(default = "default_email_error")]
     pub email_error: String,
 }
+impl Default for ErrorMessages {
+    fn default() -> Self {
+        Self {
+            captcha_error: "You did enter the wrong code at the end of the form. Please try again."
+                .to_string(),
+            email_error:
+                "An internal error occurred while sending your request. Please try again later."
+                    .to_string(),
+        }
+    }
+}
 
-fn default_name_label() -> String {
-    "Name".to_string()
-}
-fn default_name_required_feedback() -> String {
-    "Please enter your name".to_string()
-}
 #[derive(Deserialize)]
+#[serde(default)]
 pub struct NameField {
-    #[serde(default = "default_name_label")]
     pub label: String,
-    #[serde(default = "default_name_required_feedback")]
     pub required_feedback: String,
 }
+impl Default for NameField {
+    fn default() -> Self {
+        Self {
+            label: "Name".to_string(),
+            required_feedback: "Please enter your name".to_string(),
+        }
+    }
+}
 
-fn default_email_label() -> String {
-    "Email".to_string()
-}
-fn default_email_required_feedback() -> String {
-    "Please enter your email".to_string()
-}
 #[derive(Deserialize)]
+#[serde(default)]
 pub struct EmailField {
-    #[serde(default = "default_email_label")]
     pub label: String,
-    #[serde(default = "default_email_required_feedback")]
     pub required_feedback: String,
 }
+impl Default for EmailField {
+    fn default() -> Self {
+        Self {
+            label: "Email".to_string(),
+            required_feedback: "Please enter your email".to_string(),
+        }
+    }
+}
 
-fn default_captcha_label() -> String {
-    "Enter the code above".to_string()
-}
-fn default_captcha_required_feedback() -> String {
-    "Please enter the code from the image above".to_string()
-}
 #[derive(Deserialize)]
+#[serde(default)]
 pub struct CaptchaField {
-    #[serde(default = "default_captcha_label")]
     pub label: String,
-    #[serde(default = "default_captcha_required_feedback")]
     pub required_feedback: String,
 }
+impl Default for CaptchaField {
+    fn default() -> Self {
+        Self {
+            label: "Enter the code above".to_string(),
+            required_feedback: "Please enter the code from the image above".to_string(),
+        }
+    }
+}
 
-fn default_title() -> String {
-    "Contact form".to_string()
-}
-fn default_optional() -> String {
-    "optional".to_string()
-}
-fn default_submit() -> String {
-    "Submit".to_string()
-}
-fn default_success() -> String {
-    "Your request has been successfully submitted. We will get back to you soon.".to_string()
-}
-fn default_message_from() -> String {
-    "Message from".to_string()
-}
 /// Localization strings.
 #[derive(Deserialize)]
-pub struct Strings {
 #[serde(default)]
+pub struct Strings {
     pub description: String,
-    #[serde(default = "default_title")]
     pub title: String,
-    #[serde(default = "default_optional")]
     pub optional: String,
-    #[serde(default = "default_submit")]
     pub submit: String,
-    #[serde(default = "default_success")]
     pub success: String,
-    #[serde(default = "default_message_from")]
     pub message_from: String,
     pub name_field: NameField,
     pub email_field: EmailField,
     pub captcha_field: CaptchaField,
     pub error_messages: ErrorMessages,
 }
+impl Default for Strings {
+    fn default() -> Self {
+        Self {
+            description: String::default(),
+            title: "Contact form".to_string(),
+            optional: "optional".to_string(),
+            submit: "Submit".to_string(),
+            success: "Your request has been successfully submitted. We will get back to you soon."
+                .to_string(),
+            message_from: "Message from".to_string(),
+            name_field: NameField::default(),
+            email_field: EmailField::default(),
+            captcha_field: CaptchaField::default(),
+            error_messages: ErrorMessages::default(),
+        }
+    }
+}
 
-fn default_path_prefix() -> String {
-    "/".to_string()
-}
-fn default_lang() -> String {
-    "en".to_string()
-}
 #[derive(Deserialize)]
 pub struct StateConfig {
     /// The path prefix of all routes.
@@ -152,10 +149,13 @@ pub struct StateConfig {
     pub lang: String,
     pub strings: Strings,
 }
-
-fn default_socket_address() -> String {
-    "0.0.0.0:80".to_string()
+fn default_path_prefix() -> String {
+    "/".to_string()
 }
+fn default_lang() -> String {
+    "en".to_string()
+}
+
 /// Configuration.
 #[derive(Deserialize)]
 pub struct Config {
@@ -167,6 +167,9 @@ pub struct Config {
     #[serde(flatten)]
     pub state_config: StateConfig,
 }
+fn default_socket_address() -> String {
+    "0.0.0.0:80".to_string()
+}
 
 impl Config {
     /// Parses the configuration in the given data directory.