Add the port and host CLI arguments

Improve args and add them to --help

Remove unnecessary unwraps

Cargo.lock

@@ -203,6 +203,7 @@ name = "client"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "clap",
  "minisql",
  "parser",
  "proto",

client/Cargo.toml

@@ -11,3 +11,4 @@ anyhow = "1.0.76"
 proto = { path = "../proto" }
 minisql = { path = "../minisql" }
 parser = { path = "../parser" }
+clap = { version = "4.4.18", features = ["derive"] }

client/src/main.rs

@@ -1,3 +1,4 @@
+use clap::Parser;
 use proto::handshake::client::do_client_handshake;
 use proto::handshake::request::HandshakeRequest;
 use proto::reader::protoreader::ProtoReader;
@@ -9,9 +10,21 @@ use proto::message::frontend::{FrontendMessage, QueryData};
 use proto::reader::oneway::OneWayProtoReader;
 use proto::writer::oneway::OneWayProtoWriter;
 
+#[derive(Parser)]
+struct Cli {
+    /// Port number of the server.
+    #[arg(short, long, default_value_t = 5432, help = "Port number of the server")]
+    port: u16,
+
+    /// Host name or IP address of the server.
+    #[arg(short, long, default_value = "127.0.0.1", help = "Host name or IP address of the server")]
+    host: String,
+}
+
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
-    let addr = "127.0.0.1:5432";
+    let cli = Cli::parse();
+    let addr = format!("{}:{}", cli.host, cli.port);
 
     let mut stream = TcpStream::connect(addr).await?;
     let (reader, writer) = stream.split();