Add swaybar protocol header

src/main.rs

@@ -1,8 +1,12 @@
 mod swaybar_object;
 
 fn main() {
-    println!("Hello, world!");
-
+    println!(
+        "{}",
+        serde_json::to_string(&swaybar_object::SwaybarHeader::new())
+            .expect("Should be able to serialize SwaybarHeader")
+    );
+    println!("[");
     let mut array = swaybar_object::SwaybarArray::new();
     array.push_object(swaybar_object::SwaybarObject::default());
     array.push_object(swaybar_object::SwaybarObject::new());

src/swaybar_object.rs

@@ -3,6 +3,17 @@ use std::fmt::Display;
 use chrono::prelude::*;
 use serde::{Deserialize, Serialize};
 
+#[derive(Serialize, Deserialize, Debug)]
+pub struct SwaybarHeader {
+    pub version: u32,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub click_events: Option<bool>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub cont_signal: Option<u16>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub stop_signal: Option<u16>,
+}
+
 #[derive(Serialize, Deserialize, Debug)]
 pub struct SwaybarObject {
     pub full_text: String,
@@ -45,6 +56,17 @@ pub struct SwaybarArray {
     objects: Vec<SwaybarObject>,
 }
 
+impl SwaybarHeader {
+    pub fn new() -> Self {
+        Self {
+            version: 1,
+            click_events: None,
+            cont_signal: None,
+            stop_signal: None,
+        }
+    }
+}
+
 impl SwaybarObject {
     pub fn new() -> Self {
         Self {