rename argument mod to config; implement name, tracker config options

src/config.rs

@@ -0,0 +1,41 @@
+use clap::Parser;
+use std::{
+    net::{Ipv4Addr, SocketAddr, SocketAddrV4},
+    path::PathBuf,
+};
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+pub struct Config {
+    /// Server name
+    #[arg(short, long, default_value_t = String::from("βtracker"))]
+    pub name: String,
+
+    /// Tracker(s) to join / scrape requests
+    #[arg(short, long)]
+    pub tracker: Option<Vec<String>>,
+
+    /// Bind server `host:port` to listen incoming connections on it
+    #[arg(short, long, default_value_t = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::LOCALHOST, 1965)))]
+    pub bind: SocketAddr,
+
+    /// Filepath to server identity in PKCS (PFX) format
+    #[arg(short, long)]
+    pub identity: PathBuf,
+
+    /// Passphrase to unlock encrypted identity
+    #[arg(short, long, default_value_t = String::new())]
+    pub password: String,
+
+    /// btracker-fs directory
+    #[arg(short, long)]
+    pub storage: PathBuf,
+
+    /// Listing items limit
+    #[arg(short, long, default_value_t = 10)]
+    pub limit: usize,
+
+    /// Default index capacity
+    #[arg(short, long, default_value_t = 1000)]
+    pub capacity: usize,
+}