improvement: use clap for command line args

src/main.rs

@@ -1,58 +1,27 @@
 //! Server process
-
+use clap::Parser;
+use nostr_rs_relay::cli::*;
 use nostr_rs_relay::config;
 use nostr_rs_relay::server::start_server;
-use std::env;
 use std::sync::mpsc as syncmpsc;
 use std::sync::mpsc::{Receiver as MpscReceiver, Sender as MpscSender};
 use std::thread;
 use tracing::info;
 
+
 use console_subscriber::ConsoleLayer;
 
-/// Return a requested DB name from command line arguments.
-fn db_from_args(args: &[String]) -> Option<String> {
-    if args.len() == 3 && args.get(1) == Some(&"--db".to_owned()) {
-        return args.get(2).map(std::clone::Clone::clone);
-    }
-    None
-}
-
-fn print_version() {
-    println!("{} v{}", env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION"));
-}
-
-fn print_help() {
-    println!("Usage: nostr-rs-relay [OPTION]...\n");
-    println!("Options:");
-    println!("  --help              Show this help message and exit");
-    println!("  --version           Show version information and exit");
-    println!("  --db <directory>    Use the <directory> as the location of the database");
-}
 
 /// Start running a Nostr relay server.
 fn main() {
     // setup tracing
     let _trace_sub = tracing_subscriber::fmt::try_init();
     info!("Starting up from main");
+
+    let args = CLIArgs::parse();
+
     // get database directory from args
-    let args: Vec<String> = env::args().collect();
-
-    let help_flag: bool = args.contains(&"--help".to_owned());
-    // if --help flag was passed, display help and exit
-    if help_flag {
-        print_help();
-        return;
-    }
-
-    let version_flag: bool = args.contains(&"--version".to_owned());
-    // if --version flag was passed, display version and exit
-    if version_flag {
-        print_version();
-        return;
-    }
-
-    let db_dir: Option<String> = db_from_args(&args);
+    let db_dir = args.db;
     // configure settings from config.toml
     // replace default settings with those read from config.toml
     let mut settings = config::Settings::new();
@@ -62,8 +31,8 @@ fn main() {
         ConsoleLayer::builder().with_default_env().init();
     }
     // update with database location
-    if let Some(db) = db_dir {
-        settings.database.data_directory = db;
+    if db_dir.len() > 0 {
+        settings.database.data_directory = db_dir;
     }
 
     let (_, ctrl_rx): (MpscSender<()>, MpscReceiver<()>) = syncmpsc::channel();