Use yaml.

substrate/.editorconfig

@@ -9,7 +9,7 @@ trim_trailing_whitespace=true
 max_line_length=120
 insert_final_newline=true
 
-[.travis.yml]
+[*.yml]
 indent_style=space
 indent_size=2
 tab_width=8

substrate/Cargo.lock

@@ -48,6 +48,7 @@ dependencies = [
  "textwrap 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "vec_map 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "yaml-rust 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -198,6 +199,11 @@ name = "winapi-build"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "yaml-rust"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [metadata]
 "checksum aho-corasick 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "500909c4f87a9e52355b26626d890833e9e1d53ac566db76c36faa984b889699"
 "checksum ansi_term 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "23ac7c30002a5accbf7e8987d0632fa6de155b7c3d39d0067317a391e00a2ef6"
@@ -225,3 +231,4 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
+"checksum yaml-rust 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e66366e18dc58b46801afbf2ca7661a9f59cc8c5962c29892b6039b4f86fa992"

substrate/cli/Cargo.toml

 [package]
 name = "polkadot-cli"
 version = "0.1.0"
-authors = ["Tomasz Drwięga <tomusdrw@gmail.com>"]
+authors = ["Parity Team <admin@parity.io>"]
+description = "Polkadot node implementation in Rust."
 
 [dependencies]
-clap = "2.27"
+clap = { version = "2.27", features = ["yaml"] }
 env_logger = "0.4"
 log = "0.3"

substrate/cli/src/cli.yml

+name: polkadot
+version: "1.0.0"
+author: "Parity Team <admin@polkadot.io>"
+about: Polkadot Node Rust Implementation
+args:
+  - log:
+      short: l
+      value_name: LOG_PATTERN
+      help: Sets a custom logging
+      takes_value: true
+subcommands:
+  - collator:
+      about: Run collator node
+  - validator:
+      about: Run validator node

substrate/cli/src/lib.rs

@@ -14,35 +14,32 @@
 // You should have received a copy of the GNU General Public License
 // along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
 
-extern crate clap;
 extern crate env_logger;
-extern crate log;
 
-use clap::{Arg, App, SubCommand};
+#[macro_use]
+extern crate clap;
+#[macro_use]
+extern crate log;
 
 pub fn main() {
-	let matches = App::new("Polkadot")
-		.arg(Arg::with_name("log")
-			.short("l")
-			.value_name("LOG")
-			.help("Sets logging.")
-			.takes_value(true))
-		.subcommand(SubCommand::with_name("collator"))
-		.subcommand(SubCommand::with_name("validator"))
-		.get_matches();
+	let yaml = load_yaml!("./cli.yml");
+	let matches = clap::App::from_yaml(yaml).get_matches();
 
 	let log_pattern = matches.value_of("log").unwrap_or("");
 	init_logger(log_pattern);
 
 	if let Some(_) = matches.subcommand_matches("collator") {
-		println!("Running collator.");
+		info!("Starting collator.");
 		return;
 	}
 
 	if let Some(_) = matches.subcommand_matches("validator") {
-		println!("Running collator.");
+		info!("Starting validator.");
 		return;
 	}
+
+	println!("No command given.\n");
+	let _ = clap::App::from_yaml(yaml).print_long_help();
 }