Adding create date header function

src/main.rs

@@ -2,6 +2,8 @@ use chrono::{Datelike, Local};
 use clap::{Parser, Subcommand};
 use std::env;
 use std::process::Command;
+use std::fs::File;
+use std::io::Write;
 
 #[derive(Parser)]
 #[command(author, version, about = "A simple CLI tool example", long_about = None)]
@@ -35,11 +37,24 @@ fn main() {
     };
     let today = Local::now();
     let today_date_str = format!("{}-{:02}-{:02}", today.year(), today.month(), today.day());
-
     
     let file_path = format!("{}/{}/{}.md", &DAILY_FILEPATH, today.year(), &today_date_str);
+    // Check if file is there already
+    let file_name = format!("{}.md", &today_date_str);
+    let folder_name = format!("{}/{}", &DAILY_FILEPATH, today.year());
+
+    let mut directory_iterator = std::fs::read_dir(&folder_name).unwrap();
+    let file_exists = directory_iterator.any(|filename| *filename.unwrap().file_name() == *file_name);
+
+    if !file_exists {
+        // Create a new file
+        let mut file = File::create(&file_path).unwrap();
+
+        // Write date at the start
+        let date_header = format!("#{}", &today_date_str);
+        writeln!(&mut file, "{}", &date_header);
+    }
 
-    println!("vim {}", file_path);
 
     Command::new("vim")
         .arg(&file_path)