From dc8094726026c5b56b5600f95da8475561b1073d Mon Sep 17 00:00:00 2001
From: tcmal <me@aria.rip>
Date: Mon, 3 Jun 2024 17:06:15 +0100
Subject: initial commit: basic xorg initialisation

---
 src/main.rs | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/main.rs

(limited to 'src/main.rs')

diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..ea42009
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,103 @@
+use atoms::InternedAtoms;
+use clients::ClientList;
+use thiserror::Error;
+use xcb::{
+    x::{self, ChangeWindowAttributes, Screen, Window},
+    Connection, Extension,
+};
+
+mod atoms;
+mod clients;
+
+type Result<T, E = Error> = std::result::Result<T, E>;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("xcb returned screen that doesn't exist")]
+    NoSuchScreen,
+
+    #[error("other wm is running")]
+    OtherWMRunning,
+
+    #[error("connection error: {0}")]
+    ConnectionError(#[from] xcb::ConnError),
+
+    #[error("generic xcb error: {0}")]
+    XCBError(#[from] xcb::Error),
+}
+
+fn main() -> Result<()> {
+    // todo: cli stuff
+    let display_name = ":1";
+
+    cleanup_process_children();
+
+    let (conn, screen_num) =
+        Connection::connect_with_extensions(Some(display_name), &[], &[Extension::Xinerama])?;
+
+    let mut wm = WM::new(&conn, screen_num)?;
+    wm.event_loop()?;
+
+    Ok(())
+}
+
+struct WM<'a> {
+    conn: &'a Connection,
+    screen_num: i32,
+
+    root: Window,
+    clients: ClientList,
+    atoms: InternedAtoms,
+}
+
+impl WM<'_> {
+    fn new<'a>(conn: &'a Connection, screen_num: i32) -> Result<WM<'a>> {
+        // Fetch root window
+        let setup = conn.get_setup();
+        let screen = setup
+            .roots()
+            .nth(screen_num as usize)
+            .ok_or(Error::NoSuchScreen)?;
+
+        // Check no other WM is running
+        let cookie = conn.send_request_checked(&ChangeWindowAttributes {
+            window: screen.root(),
+            value_list: &[
+                x::Cw::BackPixel(screen.white_pixel()),
+                x::Cw::EventMask(x::EventMask::SUBSTRUCTURE_REDIRECT),
+            ],
+        });
+
+        conn.check_request(cookie)
+            .map_err(|_| Error::OtherWMRunning)?;
+
+        Ok(WM {
+            atoms: InternedAtoms::new_with(conn)?,
+            clients: Default::default(),
+            conn,
+            screen_num,
+            root: screen.root(),
+        })
+    }
+
+    fn event_loop(&mut self) -> Result<()> {
+        self.update_geometry()?;
+
+        Ok(())
+    }
+}
+fn cleanup_process_children() {
+    // todo: dont transform children into zombies when they terminate
+    // todo: cleanup zombies
+}
+
+impl<'a> std::fmt::Debug for WM<'a> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("WM")
+            .field("screen_num", &self.screen_num)
+            .field("root", &self.root)
+            .field("clients", &self.clients)
+            .field("atoms", &self.atoms)
+            .finish()
+    }
+}
-- 
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