squeekboard-test-layout: add argument parsing and some more output

Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 
 [dependencies]
 bitflags = "1.0.*"
+clap = "2.32.*"
 maplit = "1.0.*"
 regex = "1.1.*"
 serde = { version = "1.0.*", features = ["derive"] }

debian/control

@@ -12,6 +12,7 @@ Build-Depends:
  libgtk-3-dev,
  libcroco3-dev,
  librust-bitflags-1-dev (>= 1.0),
+ librust-clap-2+default-dev (>= 2.32),
  librust-gio+v2-44-dev,
  librust-glib+v2-44-dev,
  librust-glib-sys-dev,

src/bin/test_layout.rs

+#[macro_use]
+extern crate clap;
 extern crate rs;
 
 use rs::tests::check_layout_file;
-use std::env;
 
 fn main() -> () {
-    check_layout_file(env::args().nth(1).expect("No argument given").as_str());
+    let matches = clap_app!(test_layout =>
+        (name: "squeekboard-test-layout")
+        (about: "Test keyboard layout for errors. Returns OK or an error message containing further information.")
+        (@arg INPUT: +required "Yaml keyboard layout file to test")
+    ).get_matches();
+    if check_layout_file(matches.value_of("INPUT").unwrap()) == () {
+        println!("Test result: OK");
+    }
 }