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
@@ -101,18 +97,17 @@ 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];
-        match port.read(&mut buf) {
-            Ok(_) => {
-                return format!("Frequency set.");
-            }
-            Err(_) => {
-                return format!("Failed to set frequency.");
-            }
-        
+    match port.read(&mut buf) {
+        Ok(_) => {
+            return format!("Frequency set.");
+        }
+        Err(_) => {
+            return format!("Failed to set frequency.");
+        }
     }
 }
 
@@ -120,37 +115,32 @@ fn set_freq(comport: &str, freq: u32) -> String {
 fn write_row(str_arr: [String; 5], file: &String, fmt: &str) -> Result<(), Box<dyn Error>> {
     // From https://docs.rs/csv/latest/csv/tutorial/index.html#writing-csv
     if fmt == "csv" {
-    let file = OpenOptions::new()
-        .write(true)
-        .create(true)
-        .append(true)
-        .open(file)
-        .unwrap();
-    let mut wtr = csv::Writer::from_writer(file);
+        let file = OpenOptions::new()
+            .write(true)
+            .create(true)
+            .append(true)
+            .open(file)
+            .unwrap();
+        let mut wtr = csv::Writer::from_writer(file);
 
-    // Since we're writing records manually, we must explicitly write our
-    // header record. A header record is written the same way that other
-    // records are written.
-    // wtr.write_record(["City", "State", "Population", "Latitude", "Longitude"])?;
-    let _ = wtr.write_record(str_arr);
+        // Since we're writing records manually, we must explicitly write our
+        // header record. A header record is written the same way that other
+        // records are written.
+        // wtr.write_record(["City", "State", "Population", "Latitude", "Longitude"])?;
+        let _ = wtr.write_record(str_arr);
 
-    // A CSV writer maintains an internal buffer, so it's important
-    // to flush the buffer when you're done.
-    wtr.flush()?;
-    Ok(())
+        // A CSV writer maintains an internal buffer, so it's important
+        // to flush the buffer when you're done.
+        wtr.flush()?;
+        Ok(())
     } else {
         println!("Only accepts csv format for now, not recording to file.");
         Ok(())
     }
 }
 
-
-
-
-
 // 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(),
@@ -218,11 +217,11 @@ fn main() {
                     s_val.to_string(),
                 ],
                 &file_out,
-                "csv"
+                "csv",
             ) {
                 println!("{}", err);
             }
-    }
-    sleep(Duration::from_millis(wait as u64 * 1000));
+        }
+        sleep(Duration::from_millis(wait as u64 * 1000));
     }
 }