Support command-line parameters.

- `--help`: print help menu.
- `--config`: specify which config file to use.
- `--version`: print version and exit.

3 files changed, 90 insertions, 3 deletions

diff --git a/Cargo.lock b/Cargo.lock
index c61a8d6..d006d43 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -62,6 +62,17 @@ dependencies = [
 ]
 
 [[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
 name = "autocfg"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -160,6 +171,36 @@ dependencies = [
 ]
 
 [[package]]
+name = "clap"
+version = "3.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8c93436c21e4698bacadf42917db28b23017027a4deccb35dbe47a7e7840123"
+dependencies = [
+ "atty",
+ "bitflags",
+ "clap_derive",
+ "indexmap",
+ "lazy_static",
+ "os_str_bytes",
+ "strsim",
+ "termcolor",
+ "textwrap",
+]
+
+[[package]]
+name = "clap_derive"
+version = "3.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da95d038ede1a964ce99f49cbe27a7fb538d1da595e4b4f70b8c8f338d17bf16"
+dependencies = [
+ "heck 0.4.0",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
 name = "cloudabi"
 version = "0.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -832,6 +873,7 @@ name = "kimikuri_rs"
 version = "0.5.1"
 dependencies = [
  "bs58",
+ "clap",
  "futures",
  "serde",
  "serde_derive",
@@ -1113,6 +1155,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "os_str_bytes"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
 name = "parking_lot"
 version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1865,6 +1916,21 @@ dependencies = [
 ]
 
 [[package]]
+name = "termcolor"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bab24d30b911b2376f3a13cc2cd443142f0c81dda04c118693e35b3835757755"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1141d4d61095b28419e22cb0bbf02755f5e54e0526f97f1e3d1d160e60885fb"
+
+[[package]]
 name = "thiserror"
 version = "1.0.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2400,6 +2466,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
 [[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index 1d54179..561c288 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,4 +18,5 @@ urandom = "0.1.0"
 bs58 = "0.4.0"
 tracing = "0.1.32"
 tracing-subscriber = "0.3.9"
-tracing-appender = "0.2.2"
\ No newline at end of file
+tracing-appender = "0.2.2"
+clap = { version = "3.1.6", features = ["derive"] }
\ No newline at end of file
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) {