feat(wm): initial commit

One week of blissful, in-the-zone coding, applying all of the lessons
learnt from the development of yatta.

komorebi-core/src/cycle_direction.rs

@@ -0,0 +1,34 @@
+use clap::Clap;
+use serde::Deserialize;
+use serde::Serialize;
+use strum::Display;
+use strum::EnumString;
+
+#[derive(Clone, Copy, Debug, Serialize, Deserialize, Display, EnumString)]
+#[strum(serialize_all = "snake_case")]
+#[derive(Clap)]
+pub enum CycleDirection {
+    Previous,
+    Next,
+}
+
+impl CycleDirection {
+    pub fn next_idx(&self, idx: usize, len: usize) -> usize {
+        match self {
+            CycleDirection::Previous => {
+                if idx == 0 {
+                    len - 1
+                } else {
+                    idx - 1
+                }
+            }
+            CycleDirection::Next => {
+                if idx == len - 1 {
+                    0
+                } else {
+                    idx + 1
+                }
+            }
+        }
+    }
+}