Add rate parameter (time). Part of #14.

src/main.rs

@@ -8,6 +8,7 @@ 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)]
@@ -28,6 +29,10 @@ struct Cli {
     /// Frequency
     #[arg(short = 'f', long)]
     freq: Option<u32>,
+
+    /// Seconds to wait between measurements
+    #[arg(short = 'w', long, default_value = "5")]
+    wait: Option<u16>,
 }
 
 // Read S-meter
@@ -112,7 +117,7 @@ fn set_freq(comport: &str, freq: u32) -> String {
 }
 
 // Write row to a file
-fn write_row(str_arr: [String; 4], file: &String, fmt: &str) -> Result<(), Box<dyn Error>> {
+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()
@@ -139,8 +144,13 @@ fn write_row(str_arr: [String; 4], file: &String, fmt: &str) -> Result<(), Box<d
     }
 }
 
+
+
+
+
 // Main funtion
 fn main() {
+
     // Arguments
     let cli = Cli::parse();
 
@@ -172,11 +182,24 @@ fn main() {
         } //todo!()
     };
 
+    let wait: u16 = match cli.wait {
+        Some(wait) => wait,
+        None => {
+            return;
+        } //todo!()
+    };
+
     // Set the requested frequency
     set_freq(&com, frequency);
 
+    println!("Press Ctrl + C to quit.");
+
     // Simple test loop to make sure we are getting values each time
-    for _i in 1..11 {
+    //for _i in 1..11 {
+    loop {
+        // Get datestamp
+        let date = Local::now();
+        // Get S-meter
         let s_val = get_smeter(&com);
         //println!("{a}");
         match s_val.parse::<i32>() {
@@ -184,18 +207,22 @@ fn main() {
             Ok(n) => println!("{} {}", s_val, "#".repeat(n.try_into().unwrap())),
             Err(_e) => todo!(),
         }
-
-        if let Err(err) = write_row(
-            [
-                "time".to_string(),
-                "lat".to_string(),
-                "lon".to_string(),
-                s_val.to_string(),
-            ],
-            &file_out,
-            "csv"
-        ) {
-            println!("{}", err);
-        }
+        // If they provided a file name
+        if file_out != "" {
+            if let Err(err) = write_row(
+                [
+                    date.format("%Y-%m-%d %H:%M:%S").to_string(),
+                    frequency.to_string(),
+                    "lat".to_string(),
+                    "lon".to_string(),
+                    s_val.to_string(),
+                ],
+                &file_out,
+                "csv"
+            ) {
+                println!("{}", err);
+            }
+    }
+    sleep(Duration::from_millis(wait as u64 * 1000));
     }
 }