Add --alert flag to start subcommand

src/main.rs

@@ -1,9 +1,10 @@
 use async_std::task;
-use clap::{App, ArgMatches, SubCommand};
+use clap::{App, Arg, ArgMatches, SubCommand};
 use crossterm::{cursor, terminal::Clear, terminal::ClearType, QueueableCommand};
 use domasi::pomodoro::{Alert, Clock, Config, Status};
 use domasi::Pomodoro;
 use std::io::{stdout, Write};
+use std::path::{Path, PathBuf};
 
 use std::sync::mpsc::{channel, Receiver, Sender};
 use std::thread;
@@ -13,7 +14,18 @@ fn main() {
         .version("0.1.0")
         .author("paoda <musukarekai@gmail.com>")
         .about("Yet another pomodoro timer.")
-        .subcommand(SubCommand::with_name("start").about("Start the Pomodoro Timer"))
+        .subcommand(
+            SubCommand::with_name("start")
+                .about("Start the Pomodoro Timer")
+                .arg(
+                    Arg::with_name("alert")
+                        .short("a")
+                        .long("alert")
+                        .value_name("FILE")
+                        .takes_value(true)
+                        .help("Aloud Sound. (Supports WAV, MP3, Vorbis, FLAC)"),
+                ),
+        )
         .get_matches();
 
     // match matches.subcommand() {
@@ -26,10 +38,16 @@ fn main() {
     }
 }
 
-pub fn start(_args: &ArgMatches) {
+pub fn start(args: &ArgMatches) {
     let config = Config::default();
 
-    let audio_path = config.data_directory.join("sound/alert.ogg");
+    let audio_path: PathBuf;
+    if let Some(path) = args.value_of("alert") {
+        audio_path = Path::new(path).to_path_buf();
+    } else {
+        audio_path = config.data_directory.join("sound/alert.ogg");
+    }
+
     let default_device = rodio::default_output_device().unwrap();
     let alert = Alert::new(&audio_path, &default_device);
     let mut pomodoro = Pomodoro::new(&alert);