Restructure eval module

src/eval/range.rs

@@ -0,0 +1,32 @@
+use std::ops::RangeInclusive;
+
+use chrono::{Datelike, NaiveDate};
+
+#[derive(Debug, Clone, Copy)]
+pub struct DateRange {
+    from: NaiveDate,
+    until: NaiveDate,
+}
+
+impl DateRange {
+    pub fn new(from: NaiveDate, until: NaiveDate) -> Self {
+        assert!(from <= until);
+        Self { from, until }
+    }
+
+    pub fn contains(&self, date: NaiveDate) -> bool {
+        self.from <= date && date <= self.until
+    }
+
+    pub fn from(&self) -> NaiveDate {
+        self.from
+    }
+
+    pub fn until(&self) -> NaiveDate {
+        self.until
+    }
+
+    pub fn years(&self) -> RangeInclusive<i32> {
+        self.from.year()..=self.until.year()
+    }
+}