add time based filtering

This accepts timestamps in the following formats:

* Human-readable, like "15d", taken relative to the current time.
* rfc3339-like "2018-03-14 13:13:00"

More formats might be added in the future.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/filters.rs b/src/filters.rs
index 1549c26..c6df6e8 100644
--- a/src/filters.rs
+++ b/src/filters.rs
@@ -31,3 +31,17 @@ pub fn filter_outcome(result: &LogResult, opt: &Opt) -> bool {
         _ => false,
     }
 }
+
+/// Do filtering based on encounter time.
+pub fn filter_time(result: &LogResult, opt: &Opt) -> bool {
+    let after_ok = match opt.after {
+        Some(time) => time <= result.time,
+        None => true,
+    };
+    let before_ok = match opt.before {
+        Some(time) => time >= result.time,
+        None => true,
+    };
+
+    after_ok && before_ok
+}