-c/--config CLI option

Signed-off-by: Alexey Yerin <yerinalexey98fd@gmail.com>

Cargo.lock

@@ -1,11 +1,31 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bf8dcb5b4bbaa28653b647d8c77bd4ed40183b48882e130c1f1ffb73de069fd7"
 
+[[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 = "1.0.1"
@@ -30,6 +50,21 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
+[[package]]
+name = "clap"
+version = "2.33.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
+dependencies = [
+ "ansi_term",
+ "atty",
+ "bitflags",
+ "strsim",
+ "textwrap",
+ "unicode-width",
+ "vec_map",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.7.0"
@@ -72,6 +107,15 @@ dependencies = [
  "wasi",
 ]
 
+[[package]]
+name = "hermit-abi"
+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5aca5565f760fb5b220e499d72710ed156fdb74e631659e99377d9ebfbd13ae8"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "idna"
 version = "0.2.0"
@@ -306,6 +350,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+
 [[package]]
 name = "syn"
 version = "1.0.48"
@@ -322,6 +372,7 @@ name = "taurus"
 version = "0.0.1"
 dependencies = [
  "anyhow",
+ "clap",
  "native-tls",
  "serde",
  "toml",
@@ -342,6 +393,15 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "textwrap"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
+dependencies = [
+ "unicode-width",
+]
+
 [[package]]
 name = "tinyvec"
 version = "0.3.4"
@@ -375,6 +435,12 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-width"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.1"
@@ -398,6 +464,12 @@ version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6454029bf181f092ad1b853286f23e2c507d8e8194d01d92da4a55c274a5508c"
 
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
 [[package]]
 name = "wasi"
 version = "0.9.0+wasi-snapshot-preview1"

Cargo.toml

@@ -1,5 +1,6 @@
 [package]
 name = "taurus"
+description = "A concurrent gemini server"
 version = "0.0.1"
 authors = ["Garrit Franke <garritfranke@gmail.com>"]
 edition = "2018"
@@ -12,3 +13,4 @@ native-tls = "0.2.4"
 serde = { version = "1.0.117", features = ["derive"] }
 toml = "0.5.7"
 anyhow = "1.0.34"
+clap = "2.33.3"

src/main.rs

@@ -13,8 +13,26 @@ use std::path;
 use std::sync::Arc;
 use std::thread;
 
+use clap::{crate_authors, crate_description, crate_name, crate_version, App, Arg};
+
 fn main() -> Result<(), error::SimpleError> {
-    let config: config::Config = config::Config::load(None)
+    // CLI
+    let matches = App::new(crate_name!())
+        .version(crate_version!())
+        .author(crate_authors!())
+        .about(crate_description!())
+        .arg(
+            Arg::with_name("config")
+                .long("config")
+                .short("c")
+                .help("Alternative config file location [default /etc/taurus/taurus.toml]")
+                .next_line_help(true)
+                .value_name("FILE"),
+        )
+        .get_matches();
+
+    let config_path = matches.value_of("config").map(|v| v.to_owned());
+    let config: config::Config = config::Config::load(config_path)
         .map_err(|err| format!("failed to read configuration file: {}", err))?;
 
     // Defaults for configuration file