Use simpler date type for entries

src/eval/date.rs

@@ -0,0 +1,77 @@
+use chrono::NaiveDate;
+
+use crate::files::commands::Time;
+
+#[derive(Debug, Clone, Copy)]
+pub struct Times {
+    start: Time,
+    end: Time,
+}
+
+impl Times {
+    pub fn start(&self) -> Time {
+        self.start
+    }
+
+    pub fn end(&self) -> Time {
+        self.end
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct Dates {
+    start: NaiveDate,
+    end: NaiveDate,
+    times: Option<Times>,
+}
+
+impl Dates {
+    pub fn new(start: NaiveDate, end: NaiveDate) -> Self {
+        assert!(start <= end);
+        Self {
+            start,
+            end,
+            times: None,
+        }
+    }
+
+    pub fn new_with_time(
+        start: NaiveDate,
+        end: NaiveDate,
+        start_time: Time,
+        end_time: Time,
+    ) -> Self {
+        assert!(start <= end);
+        if start == end {
+            assert!(start_time <= end_time);
+        }
+        Self {
+            start,
+            end,
+            times: Some(Times {
+                start: start_time,
+                end: end_time,
+            }),
+        }
+    }
+
+    pub fn start(&self) -> NaiveDate {
+        self.start
+    }
+
+    pub fn end(&self) -> NaiveDate {
+        self.start
+    }
+
+    pub fn times(&self) -> Option<Times> {
+        self.times
+    }
+
+    pub fn start_time(&self) -> Option<Time> {
+        self.times.as_ref().map(Times::start)
+    }
+
+    pub fn end_time(&self) -> Option<Time> {
+        self.times.as_ref().map(Times::end)
+    }
+}