From a1c60b95e831de65339151f47b4bae6fd43bce41 Mon Sep 17 00:00:00 2001
From: Keuin <keuinx@gmail.com>
Date: Wed, 30 Mar 2022 22:28:17 +0800
Subject: Support command-line parameters. - `--help`: print help menu. -
 `--config`: specify which config file to use. - `--version`: print version
 and exit.

---
 src/main.rs | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
index 4c58eaf..34d6465 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@ use std::convert::Infallible;
 use std::net::{SocketAddr, ToSocketAddrs};
 use std::str::FromStr;
 
+use clap::Parser;
 use teloxide::prelude2::*;
 use tracing::{debug, info, Level};
 use tracing::instrument;
@@ -29,11 +30,21 @@ fn with_object<T: Clone + Send>(obj: T) -> impl Filter<Extract=(T, ), Error=Infa
     warp::any().map(move || obj.clone())
 }
 
+#[derive(Parser, Debug)]
+#[clap(author, version, about, long_about = None)]
+struct CliArgs {
+    /// The configuration file to use.
+    #[clap(short, long, default_value_t = String::from(CONFIG_FILE_NAME))]
+    config: String,
+}
+
 #[instrument]
 #[tokio::main]
 async fn main() {
-    eprintln!("Loading configuration file {}...", CONFIG_FILE_NAME);
-    let config = Config::from_file(CONFIG_FILE_NAME);
+    let args = CliArgs::parse();
+
+    eprintln!("Loading configuration file {}...", args.config);
+    let config = Config::from_file(args.config.as_str());
 
     // configure logger
     let log_level = match Level::from_str(&*config.log_level) {
-- 
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