some state and FORMATTING BB

src/main.rs

@@ -1,10 +1,9 @@
 mod setup;
+mod state;
 
 use setup::{become_wm, handle_args};
 
-use x11rb::{
-    connect, connection::Connection,
-};
+use x11rb::{connect, connection::Connection};
 
 fn main() -> anyhow::Result<()> {
     handle_args();

src/setup.rs

@@ -1,9 +1,15 @@
 use anyhow::anyhow;
 
-use x11rb::{connection::Connection, protocol::xproto::{ConnectionExt, Screen}};
+use x11rb::{
+    connection::Connection,
+    protocol::xproto::{ConnectionExt, Screen},
+};
 
 pub fn become_wm<C: Connection>(conn: &C, screen: &Screen) -> anyhow::Result<()> {
-    use x11rb::{protocol::xproto::{ChangeWindowAttributesAux, EventMask}, xcb_ffi::ReplyError};
+    use x11rb::{
+        protocol::xproto::{ChangeWindowAttributesAux, EventMask},
+        xcb_ffi::ReplyError,
+    };
 
     let change = ChangeWindowAttributesAux::default()
         .event_mask(EventMask::SUBSTRUCTURE_REDIRECT | EventMask::SUBSTRUCTURE_NOTIFY);

src/state.rs

@@ -0,0 +1,51 @@
+use x11rb::connection::Connection;
+use x11rb::protocol::xproto::{Atom, ConnectionExt, CreateGCAux, Gcontext, Window};
+use x11rb::xcb_ffi::ReplyOrIdError;
+
+#[derive(Debug)]
+pub struct WmState<'a, C: Connection> {
+    pub conn: &'a C,
+    pub screen_num: usize,
+    pub black_gc: Gcontext,
+    pub windows: Vec<WinState>,
+    pub wm_protocols: Atom,
+    pub wm_delete_window: Atom,
+}
+
+impl<'a, C: Connection> WmState<'a, C> {
+    pub fn new(conn: &'a C, screen_num: usize) -> Result<WmState<'a, C>, ReplyOrIdError> {
+        let screen = &conn.setup().roots[screen_num];
+        let black_gc = conn.generate_id()?;
+        let font = conn.generate_id()?;
+        conn.open_font(font, b"9x15")?;
+
+        let gc_aux = CreateGCAux::new()
+            .graphics_exposures(0)
+            .background(screen.white_pixel)
+            .foreground(screen.black_pixel)
+            .font(font);
+        conn.create_gc(black_gc, screen.root, &gc_aux)?;
+        conn.close_font(font)?;
+
+        let wm_protocols = conn.intern_atom(false, b"WM_PROTOCOLS")?;
+        let wm_delete_window = conn.intern_atom(false, b"WM_DELETE_WINDOW")?;
+
+        Ok(WmState {
+            conn: conn,
+            screen_num: screen_num,
+            black_gc: black_gc,
+            windows: Vec::default(),
+            wm_protocols: wm_protocols.reply()?.atom,
+            wm_delete_window: wm_delete_window.reply()?.atom,
+        })
+    }
+}
+
+#[derive(Debug)]
+pub struct WinState {
+    pub window: Window,
+    pub frame_window: Window,
+    pub x: i16,
+    pub y: i16,
+    pub width: u16,
+}