hopefully this is the first and last commit

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "i3-alternating"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+i3ipc = "*"

src/main.rs

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+use i3ipc::{reply::NodeLayout, I3Connection, I3EventListener, Subscription, event::Event, event::inner::WindowChange};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut connection = I3Connection::connect()?;
+    let mut listener = I3EventListener::connect()?;
+    let subs = [Subscription::Window];
+    listener.subscribe(&subs)?;
+    for event in listener.listen() {
+        if let Event::WindowEvent(info) = event?  {
+            match info.container.layout {
+                NodeLayout::SplitH | NodeLayout::SplitV if info.change == WindowChange::New => {
+                    let (_, _, w, h) = info.container.window_rect;
+                    if w > h {
+                        connection.run_command("split h")?;
+                    } else {
+                        connection.run_command("split v")?;
+                    }
+                },
+                _ => (),
+            }
+        }
+    }
+    Ok(())
+}