Change the default behavior for hours to 0 if discount is set

src/args.rs

@@ -5,8 +5,9 @@ use clap::Parser;
 #[command(author, version, about, long_about = None)]
 pub struct Args {
     /// How many hours you intend to work (sums with `minutes`)
-    #[arg(long, default_value_t = 8)]
-    pub hours: i64,
+    /// Usually defaults to 8 hours, but if discount is set then it defaults to 0
+    #[arg(long)]
+    pub hours: Option<i64>,
 
     /// How many minutes you intend to work (sums with `hours`)
     #[arg(long, default_value_t = 0)]

src/main.rs

@@ -11,6 +11,21 @@ use args::Args;
 fn main() -> Result<()> {
     let args = Args::parse();
     let stdin = io::stdin();
+    let hours = args.hours.unwrap_or(
+        if args.discount {
+            0
+        } else {
+            8
+        }
+    );
+
+    let target_minutes = if args.discount {
+        (8 * 60) - ((hours * 60) + args.minutes)
+    } else {
+         hours * 60 + args.minutes
+    };
+    let (hrs, mins) = time::to_hrs_minutes(target_minutes);
+    println!("Working for {}", time::show_time(hrs, mins));
     println!("Input times one per line. Send an EOF character to finish inputting...");
     let mut lines: Vec<String> = vec![];
     for line in stdin.lock().lines() {
@@ -42,11 +57,6 @@ fn main() -> Result<()> {
         total_minutes += (now - remaining).num_minutes();
     }
 
-    let target_minutes = if args.discount {
-        (8 * 60) - (args.hours * 60 + args.minutes)
-    } else {
-         args.hours * 60 + args.minutes
-    };
     println!("{}", time::get_charaterized_time_remaining(total_minutes, target_minutes));
     Ok(())
 }

src/time.rs

@@ -27,7 +27,7 @@ pub fn from_stream<'a>(reference_date: &DateTime<Local>, stream: impl Iterator<I
     return Ok(durations);
 }
 
-fn show_time(hours: i64, minutes: i64) -> String {
+pub fn show_time(hours: i64, minutes: i64) -> String {
     let pluralized_hours = match hours {
         1 => "1 hour".to_string(),
         _ => format!("{hours} hours"),
@@ -48,7 +48,7 @@ fn show_time(hours: i64, minutes: i64) -> String {
     return format!("{pluralized_hours} and {pluralized_minutes}");
 }
 
-fn to_hrs_minutes(total_minutes: i64) -> (i64, i64) {
+pub fn to_hrs_minutes(total_minutes: i64) -> (i64, i64) {
     let minutes = total_minutes % 60;
     let hours = total_minutes / 60;
     (hours, minutes)