Add `trial` module, calculate days remaining

This new module will contain functions to calculate trial days.

Here we implement a function to calculate the days remaining in a trial
period.

If there are less than 0 days remaining, it returns an error result.

Couldn't use 'error-chain' because it was complaining about `Debug` and
`PartialEq` not being defined. Don't know if it's possible to implement
those traits on 'error-chain''s ErrorKind`, but it was complicated
enough that I ended up not bothering. Went with 'quick_error' instead to
create a custom error type without having to `impl` all the required
traits.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 801591c..8e23367 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 #![recursion_limit="128"]
 
 extern crate autopilot;
+extern crate chrono;
 extern crate cocoa;
 
 #[macro_use]
@@ -20,6 +21,9 @@ extern crate log;
 extern crate objc;
 
 #[macro_use]
+extern crate quick_error;
+
+#[macro_use]
 extern crate serde_derive;
 extern crate stderrlog;
 extern crate toml;
@@ -31,6 +35,7 @@ mod config;
 mod errors;
 mod key_code;
 mod parser;
+mod trial;
 
 use parser::{Action, HeadphoneButton, MapAction, MapGroup, MapKind};