brk: first commit

_src/structs/height_map_chunk_id.rs

@@ -0,0 +1,59 @@
+use std::path::Path;
+
+use allocative::Allocative;
+use derive_deref::{Deref, DerefMut};
+
+use super::{Height, MapChunkId, HEIGHT_MAP_CHUNK_SIZE};
+
+#[derive(
+    Debug, Default, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Allocative, Deref, DerefMut,
+)]
+pub struct HeightMapChunkId(Height);
+
+impl HeightMapChunkId {
+    pub fn new(height: &Height) -> Self {
+        Self(Height::new(
+            **height / HEIGHT_MAP_CHUNK_SIZE * HEIGHT_MAP_CHUNK_SIZE,
+        ))
+    }
+}
+
+impl MapChunkId for HeightMapChunkId {
+    fn to_string(&self) -> String {
+        let start = ***self;
+        let end = start + HEIGHT_MAP_CHUNK_SIZE;
+
+        format!("{start}..{end}")
+    }
+
+    fn from_path(path: &Path) -> color_eyre::Result<Self> {
+        Ok(Self(Height::new(
+            path.file_name()
+                .unwrap()
+                .to_str()
+                .unwrap()
+                .split("..")
+                .next()
+                .unwrap()
+                .parse::<u32>()?,
+        )))
+    }
+
+    fn to_usize(self) -> usize {
+        **self as usize
+    }
+
+    fn from_usize(id: usize) -> Self {
+        Self(Height::new(id as u32))
+    }
+
+    fn next(&self) -> Option<Self> {
+        self.checked_add(HEIGHT_MAP_CHUNK_SIZE)
+            .map(|h| Self(Height::new(h)))
+    }
+
+    fn previous(&self) -> Option<Self> {
+        self.checked_sub(HEIGHT_MAP_CHUNK_SIZE)
+            .map(|h| Self(Height::new(h)))
+    }
+}