Finally got header and streak working

src/main.rs

@@ -92,7 +92,7 @@ fn read_daily_post_metadata(filepath: &str)-> Result<DailyPostMetadata, &str> {
 
 fn update_streak(daily_filepath: &str, file: &mut File) {
     // Get filepath from yesterday. If does not exist, return 0.
-    let mut streak: u32 = 0;
+    let streak: u32 = 0;
     let yesterday_filepath = get_yesterday_filepath();
     let today = Local::now();
 
@@ -102,7 +102,9 @@ fn update_streak(daily_filepath: &str, file: &mut File) {
         };
 
         let stringified_yaml = serde_yaml::to_string(&today_metadata).unwrap();
-        file.write_all(stringified_yaml.as_bytes()).expect("Unable to write YAML metadata");
+        let yaml = format!("---\n{}\n---\n", &stringified_yaml);
+        file.write_all(yaml.as_bytes()).expect("Unable to write YAML metadata");
+
         return ();
     }
 
@@ -117,7 +119,8 @@ fn update_streak(daily_filepath: &str, file: &mut File) {
         };
 
         let stringified_yaml = serde_yaml::to_string(&today_metadata).unwrap();
-        file.write_all(stringified_yaml.as_bytes()).expect("Unable to write YAML metadata");
+        let yaml = format!("---\n{}\n---\n", &stringified_yaml);
+        file.write_all(yaml.as_bytes()).expect("Unable to write YAML metadata");
         return ();
     }
 
@@ -125,9 +128,11 @@ fn update_streak(daily_filepath: &str, file: &mut File) {
     let today_metadata = DailyPostMetadata {
         streak:  prev_metadata.streak + 1,
     };
+    println!("two");
 
     let stringified_yaml = serde_yaml::to_string(&today_metadata).unwrap();
-    file.write_all(stringified_yaml.as_bytes()).expect("Unable to write YAML metadata");
+    let yaml = format!("---\n{}\n---\n", &stringified_yaml);
+    file.write_all(yaml.as_bytes()).expect("Unable to write YAML metadata");
 }
 
 fn main() {
@@ -146,6 +151,7 @@ fn main() {
     let file_exists = directory_iterator.any(|filename| *filename.unwrap().file_name() == *file_name);
 
     if !file_exists {
+        println!("file does not exist");
         // Create a new file
         let mut file = File::create(&file_path).unwrap();
 
@@ -155,6 +161,7 @@ fn main() {
         // Write date at the start
         let date_header = format!("# {}", &today_date_str);
         writeln!(&mut file, "{}", &date_header);
+
     }