From 4be0e3b361615a84ecf1402b827a81ca62e95bc5 Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Tue, 26 Sep 2017 17:41:20 +0200
Subject: Implement filter interface for matchers

---
 Cargo.toml       |  7 +++++++
 src/indicator.rs | 42 ++++++++++++++++++++++++++++++++++++++++++
 src/iter.rs      | 17 +++++++++++++++++
 src/lib.rs       |  3 +++
 src/matcher.rs   | 11 +++++++++++
 5 files changed, 80 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index 17b7e02..4995361 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,3 +15,10 @@ repository    = "https://github.com/matthiasbeyer/kairos"
 [dependencies]
 chrono = "0.4"
 error-chain = "0.10"
+
+filters = { version  = "0.1.1", optional = true }
+
+[features]
+default = []
+with-filters = [ "filters" ]
+
diff --git a/src/indicator.rs b/src/indicator.rs
index 7a57b7e..72e1136 100644
--- a/src/indicator.rs
+++ b/src/indicator.rs
@@ -57,3 +57,45 @@ impl Into<u32> for Month {
         }
     }
 }
+
+#[cfg(feature = "with-filters")]
+pub struct DayFilter(Day);
+
+#[cfg(feature = "with-filters")]
+impl Filter<TimeType> for DayFilter {
+    fn filter(&self, tt: &TimeType) -> bool {
+        tt.get_moment(|mom| mom.weekday() == self.0.into()).unwrap_or(false)
+    }
+}
+
+#[cfg(feature = "with-filters")]
+impl IntoFilter<TimeType> for Day {
+    type IntoFilt = DayFilter;
+
+    fn into_filter(self) -> Self::IntoFilt {
+        DayFilter(self)
+    }
+
+}
+
+
+#[cfg(feature = "with-filters")]
+pub struct MonthFilter(Month);
+
+#[cfg(feature = "with-filters")]
+impl Filter<TimeType> for MonthFilter {
+    fn filter(&self, tt: &TimeType) -> bool {
+        tt.get_moment(|mom| mom.month() == self.0.into()).unwrap_or(false)
+    }
+}
+
+#[cfg(feature = "with-filters")]
+impl IntoFilter<TimeType> for Month {
+    type IntoFilt = MonthFilter;
+
+    fn into_filter(self) -> Self::IntoFilt {
+        MonthFilter(self)
+    }
+
+}
+
diff --git a/src/iter.rs b/src/iter.rs
index 7e53da4..0b8c6a0 100644
--- a/src/iter.rs
+++ b/src/iter.rs
@@ -412,3 +412,20 @@ mod type_tests {
     }
 }
 
+#[cfg(all(feature = "with-filters", test))]
+mod type_tests_filter_interface {
+    use super::*;
+    use super::IntoCalculatingIter;
+    use super::extensions::*;
+
+    #[test]
+    fn test_compile() {
+        // This test is solely to check whether this compiles and the API is nice
+        let _ = TimeType::today()
+            .yearly(1)
+            .unwrap()
+            .calculate()
+            .every(::indicator::Day::Monday.or(::indicator::Month::January));
+    }
+}
+
diff --git a/src/lib.rs b/src/lib.rs
index e861ccd..b537b14 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,9 @@
 extern crate error_chain;
 extern crate chrono;
 
+#[cfg(feature = "with-filters")]
+extern crate filters;
+
 pub mod error;
 pub mod iter;
 pub mod result;
diff --git a/src/matcher.rs b/src/matcher.rs
index 1482b68..d574090 100644
--- a/src/matcher.rs
+++ b/src/matcher.rs
@@ -34,4 +34,15 @@ impl Matcher for Month {
 
 }
 
+#[cfg(feature = "with-filters")]
+use filters::filter::*;
+
+#[cfg(feature = "with-filters")]
+impl<F> Matcher for F
+    where F: Filter<TimeType>
+{
+    fn matches(&self, tt: &TimeType) -> Result<bool> {
+        Ok(self.filter(tt))
+    }
+}
 
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