Add optional --dbpath flag (#6)

* Use common config with lower cache capacity

* Add command line argument parser

* Add optional --dbpath flag

src/main.rs

@@ -1,38 +1,48 @@
 extern crate pretty_env_logger;
 #[macro_use]
 extern crate log;
+extern crate clap;
 extern crate crypto;
 mod config;
 mod db;
 mod mail;
 mod rfd;
 
-use std::env;
-
-fn help() {
-    println!(
-        "usage:\n
-rfd-notify <config-toml>
-    Specify the filepath of the config."
-    );
-}
+use clap::{App, Arg};
 
 fn main() {
     pretty_env_logger::init();
-    let args: Vec<String> = env::args().collect();
 
-    match args.len() {
-        2 => {
-            let config_path = &args[1];
-            let config = config::parse(config_path);
-            debug!("{:?}\n", config);
-            let hot_deals = rfd::get_hot_deals().map_err(|err| error!("{:?}", err)).ok();
-            let parsed_deals = rfd::parse_hot_deals(&hot_deals.unwrap());
-            rfd::match_deals(parsed_deals, config)
-        }
-        _ => {
-            help();
-        }
-    }
+    let app = App::new("rfd-notify")
+        .version("0.1.0")
+        .about("Send emails based on regular expressions")
+        .args(&[
+            Arg::with_name("config")
+                .required(true)
+                .takes_value(true)
+                .short("c")
+                .help("Specify path to config")
+                .long("config"),
+            Arg::with_name("dbpath")
+                .default_value("./deals_db")
+                .takes_value(true)
+                .short("d")
+                .help("Specify path to where the embedded database is stored")
+                .long("dbpath"),
+        ]);
+
+    let matches = app.get_matches();
+
+    let config = matches.value_of("config").unwrap();
+    let parsed_config = config::parse(config);
+
+    debug!("{:?}\n", parsed_config);
+    let hot_deals = rfd::get_hot_deals().map_err(|err| error!("{:?}", err)).ok();
+    let parsed_deals = rfd::parse_hot_deals(&hot_deals.unwrap());
+    rfd::match_deals(
+        parsed_deals,
+        parsed_config,
+        matches.value_of("dbpath").unwrap(),
+    );
     info!("Complete")
 }