Add more info for user.

src/main.rs

@@ -1,29 +1,25 @@
+use chrono::Local;
+use clap::Parser;
 use serialport::DataBits;
 use serialport::Parity;
 use serialport::StopBits;
+use std::error::Error;
 use std::fs::OpenOptions;
 use std::io::ErrorKind;
 use std::io::Write;
 use std::thread::sleep;
 use std::time::Duration;
-use std::{error::Error};
-use clap::Parser;
-use chrono::Local;
 
 /// Command-line arguments using Clap.
 #[derive(Parser, Debug)]
-#[command(
-    author,
-    version,
-    about = "ASMR: Automatic S-Meter Reader"
-)]
+#[command(author, version, about = "ASMR: Automatic S-Meter Reader")]
 struct Cli {
     /// COM port
     #[arg(short = 'c', long)]
     com: Option<String>,
 
     /// Format
-    #[arg(short = 'o', long, default_value = "result.csv")]
+    #[arg(short = 'o', long,)]
     file: Option<String>,
 
     /// Frequency
@@ -101,7 +97,7 @@ fn set_freq(comport: &str, freq: u32) -> String {
             std::io::stdout().flush().unwrap();
         }
         Err(ref e) if e.kind() == ErrorKind::TimedOut => (),
-        Err(e) => eprintln!("{:?}", e)
+        Err(e) => eprintln!("{:?}", e),
     }
 
     let mut buf = [0u8; 1024];
@@ -112,7 +108,6 @@ fn set_freq(comport: &str, freq: u32) -> String {
         Err(_) => {
             return format!("Failed to set frequency.");
         }
-        
     }
 }
 
@@ -144,13 +139,8 @@ fn write_row(str_arr: [String; 5], file: &String, fmt: &str) -> Result<(), Box<d
     }
 }
 
-
-
-
-
 // Main funtion
 fn main() {
-
     // Arguments
     let cli = Cli::parse();
 
@@ -169,9 +159,13 @@ fn main() {
     };
 
     let file_out = match cli.file {
-        Some(file_out) => file_out,
+        Some(file_out) => {
+            println!("Saving results to {}", file_out);
+            file_out
+        },
         None => {
-            return;
+            println!("Not saving results. Use `-o file.csv` to save to a file.");
+            "no file".to_string()
         } //todo!()
     };
 
@@ -204,11 +198,16 @@ fn main() {
         //println!("{a}");
         match s_val.parse::<i32>() {
             // Simple graph as we go. Eventually this will be replaced.
-            Ok(n) => println!("{} {}", s_val, "#".repeat(n.try_into().unwrap())),
+            Ok(n) => println!(
+                "{} {} {}",
+                date.format("%Y-%m-%d %H:%M:%S").to_string(),
+                s_val,
+                "#".repeat(n.try_into().unwrap())
+            ),
             Err(_e) => todo!(),
         }
         // If they provided a file name
-        if file_out != "" {
+        if file_out != "no file" {
             if let Err(err) = write_row(
                 [
                     date.format("%Y-%m-%d %H:%M:%S").to_string(),
@@ -218,7 +217,7 @@ fn main() {
                     s_val.to_string(),
                 ],
                 &file_out,
-                "csv"
+                "csv",
             ) {
                 println!("{}", err);
             }