move contents of taskchampion repo to tc/

rust/lib/src/atomic.rs

@@ -0,0 +1,34 @@
+//! Trait implementations for a few atomic types
+
+use crate::traits::*;
+use taskchampion::chrono::prelude::*;
+
+impl PassByValue for usize {
+    type RustType = usize;
+
+    unsafe fn from_ctype(self) -> usize {
+        self
+    }
+
+    fn as_ctype(arg: usize) -> usize {
+        arg
+    }
+}
+
+/// Convert an Option<DateTime<Utc>> to a libc::time_t, or zero if not set.
+impl PassByValue for libc::time_t {
+    type RustType = Option<DateTime<Utc>>;
+
+    unsafe fn from_ctype(self) -> Option<DateTime<Utc>> {
+        if self == 0 {
+            None
+        } else {
+            Some(Utc.timestamp(self as i64, 0))
+        }
+    }
+
+    fn as_ctype(arg: Option<DateTime<Utc>>) -> libc::time_t {
+        arg.map(|ts| ts.timestamp() as libc::time_t)
+            .unwrap_or(0 as libc::time_t)
+    }
+}