brk: first commit

_src/structs/date_map_chunk_id.rs

@@ -0,0 +1,50 @@
+use std::path::Path;
+
+use allocative::Allocative;
+use chrono::Datelike;
+
+use super::{Date, MapChunkId};
+
+#[derive(Debug, Default, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Allocative)]
+pub struct DateMapChunkId(i32);
+
+impl DateMapChunkId {
+    pub fn new(date: &Date) -> Self {
+        Self(date.year())
+    }
+}
+
+impl MapChunkId for DateMapChunkId {
+    fn to_string(&self) -> String {
+        self.0.to_string()
+    }
+
+    fn from_path(path: &Path) -> color_eyre::Result<Self> {
+        Ok(Self(
+            path.file_name()
+                .unwrap()
+                .to_str()
+                .unwrap()
+                .split(".")
+                .next()
+                .unwrap()
+                .parse::<i32>()?,
+        ))
+    }
+
+    fn to_usize(self) -> usize {
+        self.0 as usize
+    }
+
+    fn from_usize(id: usize) -> Self {
+        Self(id as i32)
+    }
+
+    fn next(&self) -> Option<Self> {
+        self.0.checked_add(1).map(Self)
+    }
+
+    fn previous(&self) -> Option<Self> {
+        self.0.checked_sub(1).map(Self)
+    }
+}