Expanded command line arguments, added `-h` text.

.gitignore

@@ -1,2 +1,3 @@
 /target
 *.swp
+test.toml

src/main.rs

@@ -1,3 +1,39 @@
+use structopt::StructOpt;
+use toml::Value;
+
+use std::path::PathBuf;
+use std::fs::{read_to_string, copy};
+
+#[derive(StructOpt, Debug)]
+/// structure representing command line arguments
+struct Opt {
+	#[structopt(name = "FILE")]
+	/// The input file.
+	/// It contains all the settings related to substitution
+	toml: PathBuf,
+
+	#[structopt(short, long, default_value = "output")]
+	/// Output directory.
+	output: PathBuf,
+
+	#[structopt(short, long)]
+	/// Template to be processed.
+	/// if a directory, then all the unspecified
+	/// files will be copied to the output as well.
+	template: PathBuf,
+}
+
+
 fn main() {
-    println!("Hello, world!");
+	// parse command line arguments
+	let opt = Opt::from_args();
+	//println!("{:?}", opt);
+
+	// parse toml
+	let value = read_to_string(opt.toml)
+		.unwrap()
+		.parse::<Value>()
+		.unwrap();
+	println!("{:?}", value);
+
 }