Adds header parsing with basic arguments

src/main.rs

@@ -1,3 +1,47 @@
-fn main() {
-    println!("Hello, world!");
+use std::{env::{self}, io::Error, path::Path};
+use std::fs;
+
+pub mod headproc; // The HEAder PROCessing 
+
+/// Use for handling possible formats of the WFDB data
+#[derive(Debug, Clone, Copy)]
+enum SignalFormat {
+    Format16 = 16,
+    Format212 = 212,
+    Unimpl = 0
 }
+
+fn main() -> Result<(), Error>{
+    let args: Vec<String> = env::args().collect();
+
+    if args.len() <= 1 || args.contains(&"help".to_string()) {
+        help();
+        return Ok(());
+    }
+
+    let filepath = Path::new(&args[1]);
+    if !filepath.is_file() {
+        println!("Path argument provided is not a valid file");
+        return Ok(());
+    }
+    if filepath.extension().unwrap() != "hea" {
+        println!("File provided is not a .hea file");
+        return Ok(());
+    }
+
+    let hea_file_result = fs::read_to_string(filepath);
+    match hea_file_result {
+        Ok(file_data) => {
+            let header = headproc::parse_header(file_data.as_str());
+            dbg!(header);
+        }
+        Err(e) => return Err(e)
+    }
+    println!("Hello, world!");
+    Ok(())
+}
+
+fn help() {
+    println!("Conversion of WFDB files to a more human readable format. By default to a CSV.");
+    println!("\nUse in the format \"wfdb_corrosion (.hea filename)\"")
+}