Icalendar highlevel interface (#19)

* Add error kind for "not an icalendar"

* Move helper macros to utils

* Add optional date/datetime conversions

* Add optional dependency: chrono
* Add error types for converting from parser error from chrono
* Add AsDateTime for icalendar times
* Add travis build script with all features tested

* Add tests

* Add tests with simple test entry
* Add test for owncloud-generated cal entry
* Add conversions-testing for entries

* Use container type for returning either Date or DateTime

* fixup! Move helper macros to utils

* Fix to use list syntax

* Capitalize consistently

* Use ? instead of callback chaining

* Remove all unneeded imports

1 files changed, 8 insertions, 0 deletions

diff --git a/src/error.rs b/src/error.rs
index cf34910..22e64a8 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -5,6 +5,10 @@ error_chain! {
         VObjectError, VObjectErrorKind, ResultExt, Result;
     }
 
+    foreign_links {
+        ChronoParseError(::chrono::format::ParseError) #[cfg(feature = "timeconversions")];
+    }
+
     errors {
         ParserError(desc: String) {
             description("Parser error")
@@ -16,6 +20,10 @@ error_chain! {
             display("Passed content string is not a VCard")
         }
 
+        NotAnICalendar(content: String) {
+            description("Input is not a valid ICalendar")
+            display("Not an ICalendar: '{}'", content)
+        }
     }