1 files changed, 84 insertions, 57 deletions
diff --git a/src/main.rs b/src/main.rs
index 40fe645..7e379c8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,68 +1,95 @@
 extern crate clap;
 mod lib;
 use clap::{App, Arg};
+use std::env;
 use std::process;
 
 /// Central application entry point.
 fn main() {
-    let matches = App::new(env!("CARGO_PKG_NAME"))
-       .version(env!("CARGO_PKG_VERSION"))
-       .about(env!("CARGO_PKG_DESCRIPTION")) // CARGO_PKG_HOMEPAGE
-       .author(env!("CARGO_PKG_AUTHORS"))
-       .arg(Arg::with_name("cols")
-                    .short("c")
-                    .long("cols")
-                    .value_name("columns")
-                    .help("Set column length")
-                    .takes_value(true))
-        .arg(Arg::with_name("len")
-                    .short("l")
-                    .long("len")
-                    .value_name("len")
-                    .help("Set <len> bytes to read")
-                    .takes_value(true))
-        .arg(Arg::with_name("format")
-                    .short("f")
-                    .long("format")
-                    .help("Set format of octet: Octal (o), LowerHex (x), UpperHex (X), Binary (b)")
-                    .possible_values(&["o", "x", "X", "b"])
-                    .takes_value(true))
-        .arg(Arg::with_name("INPUTFILE")
-                    .help("Pass file path as an argument for hex dump")
-                    .required(true)
-                    .index(1))
-        .arg(Arg::with_name("v")
-                    .short("v")
-                    .multiple(true)
-                    .help("Sets verbosity level"))
-        .arg(Arg::with_name("color")
-                    .short("t")
-                    .long("color")
-                    .help("Set color tint terminal output. 0 to disable, 1 to enable")
-                    .default_value("1")
-                    .possible_values(&["0", "1"])
-                    .takes_value(true))
-        .arg(Arg::with_name("array")
-                    .short("a")
-                    .long("array")
-                    .value_name("array_format")
-                    .help("Set source code format output: rust (r), C (c), golang (g)")
-                    .possible_values(&["r", "c", "g"])
-                    .takes_value(true))
-        .arg(Arg::with_name("func")
-                    .short("u")
-                    .long("func")
-                    .value_name("func_length")
-                    .help("Set function wave length")
-                    .takes_value(true))
-        .arg(Arg::with_name("places")
-                    .short("p")
-                    .long("places")
-                    .value_name("func_places")
-                    .help("Set function wave output decimal places")
-                    .takes_value(true))
-       .get_matches();
+    let app = App::new(env!("CARGO_PKG_NAME"))
+        .version(env!("CARGO_PKG_VERSION"))
+        .about(env!("CARGO_PKG_DESCRIPTION")) // CARGO_PKG_HOMEPAGE
+        .author(env!("CARGO_PKG_AUTHORS"))
+        .arg(
+            Arg::with_name("cols")
+                .short("c")
+                .long("cols")
+                .value_name("columns")
+                .help("Set column length")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("len")
+                .short("l")
+                .long("len")
+                .value_name("len")
+                .help("Set <len> bytes to read")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("format")
+                .short("f")
+                .long("format")
+                .help("Set format of octet: Octal (o), LowerHex (x), UpperHex (X), Binary (b)")
+                .possible_values(&["o", "x", "X", "b"])
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("INPUTFILE")
+                .help("Pass file path as an argument for hex dump")
+                .required(true)
+                .index(1),
+        )
+        .arg(
+            Arg::with_name("v")
+                .short("v")
+                .multiple(true)
+                .help("Sets verbosity level"),
+        )
+        .arg(
+            Arg::with_name("color")
+                .short("t")
+                .long("color")
+                .help("Set color tint terminal output. 0 to disable, 1 to enable")
+                .default_value("1")
+                .possible_values(&["0", "1"])
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("array")
+                .short("a")
+                .long("array")
+                .value_name("array_format")
+                .help("Set source code format output: rust (r), C (c), golang (g)")
+                .possible_values(&["r", "c", "g"])
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("func")
+                .short("u")
+                .long("func")
+                .value_name("func_length")
+                .help("Set function wave length")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("places")
+                .short("p")
+                .long("places")
+                .value_name("func_places")
+                .help("Set function wave output decimal places")
+                .takes_value(true),
+        );
 
+    let args: Vec<_> = env::args().collect();
+    if args.len() == 1 {
+        app.clone().print_help().unwrap();
+        println!("");
+        println!("");
+        process::exit(0);
+    }
+
+    let matches = app.get_matches();
     match lib::run(matches) {
         Ok(_) => {
             process::exit(0);