implement keymaps! they still have quite a bit of work to be any good...

but now our key do stuff when pressed (at the compositor level)

src/keymap.zig

@@ -0,0 +1,37 @@
+//! This is a simple way to define a keymap. To keep hashing consistent the
+//! hash is generated here.
+const Keymap = @This();
+
+const std = @import("std");
+
+const xkb = @import("xkbcommon");
+const wlr = @import("wlroots");
+const zlua = @import("zlua");
+
+const Lua = &@import("main.zig").lua;
+
+modifier: wlr.Keyboard.ModifierMask,
+keycode: xkb.Keysym,
+/// This is the location of the lua function in the lua registry
+lua_ref_idx: i32,
+options: struct {
+  /// if false the callback is called on press
+  on_release: bool,
+},
+
+pub fn callback(self: *const Keymap) void {
+  const t = Lua.state.rawGetIndex(zlua.registry_index, self.lua_ref_idx);
+  if (t != zlua.LuaType.function) {
+    std.log.err("Failed to call keybind, it doesn't have a callback.", .{});
+    return;
+  }
+  Lua.state.pushValue(1);
+  Lua.state.call(.{ .args = 0, .results = 0 });
+  Lua.state.pop(-1);
+}
+
+pub fn hash(modifier: wlr.Keyboard.ModifierMask, keycode: xkb.Keysym) u64 {
+  const mod_val: u32 = @bitCast(modifier);
+  const key_val: u32 = @intFromEnum(keycode);
+  return (@as(u64, mod_val) << 32) | @as(u64, key_val);
+}