Started Rust in Action MEAP.

1 files changed, 53 insertions, 0 deletions

diff --git a/meap/meap-code/ch9/ch9-clock1/src/main.rs b/meap/meap-code/ch9/ch9-clock1/src/main.rs
new file mode 100644
index 0000000..7f3c941
--- /dev/null
+++ b/meap/meap-code/ch9/ch9-clock1/src/main.rs
@@ -0,0 +1,53 @@
+extern crate chrono;
+extern crate clap;
+
+use clap::{App,Arg};
+use chrono::{DateTime}; // date type
+use chrono::{Local}; // timezone types
+
+struct Clock;
+
+impl Clock {
+    fn get() -> DateTime<Local> {
+        Local::now()
+    }
+
+    fn set() -> ! {
+        unimplemented!()
+    }
+}
+
+fn main() {    
+    let app = App::new("clock")
+        .version("0.1")
+        .about("Gets and sets (aspirationally) the time.")
+        .arg(Arg::with_name("action")
+            .takes_value(true)
+            .possible_values(&["get", "set"])
+            .default_value("get"))
+        .arg(Arg::with_name("std")
+            .short("s")
+            .long("use-standard")
+            .takes_value(true)
+            .possible_values(&["rfc2822", "rfc3339", "timestamp"])
+            .default_value("rfc3339"))
+        .arg(Arg::with_name("datetime")
+            .help("When <action> is 'set', apply <datetime>. Otherwise, ignore."));
+
+    let args = app.get_matches();
+
+    let action = args.value_of("std").unwrap(); // default_value() has been supplied,
+    let std = args.value_of("std").unwrap();    // so it's safe to use .unwrap()
+
+    if action == "set" {
+        unimplemented!() // break early
+    }
+
+    let now = Clock::get();
+    match std {
+        "timestamp" => println!("{}", now.timestamp()),
+        "rfc2822"   => println!("{}", now.to_rfc2822()),
+        "rfc3339"   => println!("{}", now.to_rfc3339()),
+        _ => unreachable!(),
+    }
+}