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)

api.lua

@@ -80,4 +80,11 @@ mez.options = {
 	}
 }
 
+---------------- Keybinds ----------------
+mez.add_keybind("modifier", "keycode", function()
+  -- callback
+end, {
+    -- additional options
+})
+
 -- Virtual terminal switching

runtime/share/mezzaluna/init.lua

@@ -9,3 +9,8 @@ end
 
 mez.path.config = mez.fs.joinpath(env_conf, "mez", "init.lua")
 package.path = package.path..";"..mez.fs.joinpath(env_conf, "mez", "lua", "?.lua")
+
+-- this is an example
+-- mez.api.add_keymap("ctrl", "a", function()
+--   print("hello from my keymap")
+-- end)

src/keyboard.zig

@@ -3,6 +3,7 @@ const Keyboard = @This();
 const std = @import("std");
 const gpa = std.heap.c_allocator;
 const server = &@import("main.zig").server;
+const Keymap = @import("keymap.zig");
 
 const wl = @import("wayland").server.wl;
 const wlr = @import("wlroots");
@@ -65,17 +66,17 @@ fn handleModifiers(_: *wl.Listener(*wlr.Keyboard), wlr_keyboard: *wlr.Keyboard)
 
 fn handleKey(_: *wl.Listener(*wlr.Keyboard.event.Key), event: *wlr.Keyboard.event.Key) void {
   // Translate libinput keycode -> xkbcommon
-  // const keycode = event.keycode + 8;
+  const keycode = event.keycode + 8;
 
-  // TODO: lua handle keybinds here
-  const handled = false;
-  if (server.keyboard.wlr_keyboard.getModifiers().alt and event.state == .pressed) {
-    // for (wlr_keyboard.xkb_state.?.keyGetSyms(keycode)) |sym| {
-    //   if (keyboard.server.handleKeybind(sym)) {
-    //     handled = true;
-    //     break;
-    //   }
-    // }
+  var handled = false;
+  const modifiers = server.keyboard.wlr_keyboard.getModifiers();
+  for (server.keyboard.wlr_keyboard.xkb_state.?.keyGetSyms(keycode)) |sym| {
+    if (server.keymaps.get(Keymap.hash(modifiers, sym))) |map| {
+      if (event.state == .pressed and !map.options.on_release) {
+        map.callback();
+        handled = true;
+      }
+    }
   }
 
   if (!handled) {

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);
+}

src/lua/api.zig

@@ -0,0 +1,91 @@
+const Api = @This();
+
+const std = @import("std");
+const server = &@import("../main.zig").server;
+const Keymap = @import("../keymap.zig");
+
+const zlua = @import("zlua");
+const xkb = @import("xkbcommon");
+const wlr = @import("wlroots");
+
+const gpa = std.heap.c_allocator;
+
+pub fn add_keymap(L: *zlua.Lua) i32 {
+  const nargs: i32 = L.getTop();
+  if (nargs < 3) {
+    L.raiseErrorStr("Expected at least three arguments", .{});
+    return 0;
+  }
+
+  // ensure the first three agrs of the correct types
+  L.checkType(1, .string);
+  L.checkType(2, .string);
+  L.checkType(3, .function);
+
+  var keymap: Keymap = undefined;
+
+  const mod = L.toString(1) catch {
+    L.raiseErrorStr("Lua error check your config", .{});
+    return 0;
+  };
+  var it = std.mem.splitScalar(u8, mod, '|');
+  var modifiers = wlr.Keyboard.ModifierMask{};
+  while (it.next()) |m| {
+    // TODO: can we generate this at comptime?
+    if (std.mem.eql(u8, m, "shift")) {
+      modifiers.shift = true;
+    } else if (std.mem.eql(u8, m, "caps")) {
+      modifiers.caps = true;
+    } else if (std.mem.eql(u8, m, "ctrl")) {
+      modifiers.ctrl = true;
+    } else if (std.mem.eql(u8, m, "alt")) {
+      modifiers.alt = true;
+    } else if (std.mem.eql(u8, m, "mod2")) {
+      modifiers.mod2 = true;
+    } else if (std.mem.eql(u8, m, "mod3")) {
+      modifiers.mod3 = true;
+    } else if (std.mem.eql(u8, m, "logo")) {
+      modifiers.logo = true;
+    } else if (std.mem.eql(u8, m, "mod5")) {
+      modifiers.mod5 = true;
+    }
+  }
+  keymap.modifier = modifiers;
+
+  const key = L.toString(2) catch {
+    L.raiseErrorStr("Lua error check your config", .{});
+    return 0;
+  };
+  keymap.keycode = xkb.Keysym.fromName(key, .no_flags);
+
+  L.checkType(3, .function);
+  keymap.lua_ref_idx = L.ref(zlua.registry_index) catch {
+    L.raiseErrorStr("Lua error check your config", .{});
+    return 0;
+  };
+
+  // FIXME: for som reason I can't seem to get this to validate that the 4th
+  // argument exists unless there's a 5th argument. It doesn't seem to matter
+  // what type the 5th is just that it's there.
+  if (nargs == 4) {
+    // L.checkType(4, .table);
+    // _ = L.pushString("on_release");
+    // _ = L.getTable(4);
+    // const b = L.toBoolean(-1);
+    // L.pop(-1);
+    // L.pop(-1);
+  }
+
+  const hash = Keymap.hash(keymap.modifier, keymap.keycode);
+  server.keymaps.put(hash, keymap) catch |err| {
+    std.log.err("Failed to add keymap to keymaps: {}", .{err});
+    return 0;
+  };
+
+  return 0;
+}
+
+pub fn get_keybind(L: *zlua.Lua) i32 {
+  _ = L;
+  return 0;
+}

src/lua/lua.zig

@@ -6,6 +6,7 @@ const zlua = @import("zlua");
 
 const Bridge = @import("bridge.zig");
 const Fs = @import("fs.zig");
+const Api = @import("api.zig");
 
 const gpa = std.heap.c_allocator;
 
@@ -53,10 +54,15 @@ pub fn init(self: *Lua) !void {
       defer _ = self.state.setField(-2, "path");
     }
     {
-      const funcs = zlua.fnRegsFromType(Fs);
-      self.state.newLib(funcs);
+      const fs_funcs = zlua.fnRegsFromType(Fs);
+      self.state.newLib(fs_funcs);
       self.state.setField(-2, "fs");
     }
+    {
+      const api_funcs = zlua.fnRegsFromType(Api);
+      self.state.newLib(api_funcs);
+      self.state.setField(-2, "api");
+    }
   }
 
   loadRuntimeDir(self) catch |err| {

src/main.zig

@@ -14,9 +14,9 @@ pub fn main() !void {
 
   std.log.info("Starting mezzaluna", .{});
 
-  try lua.init();
   try server.init();
   defer server.deinit();
+  try lua.init();
 
   var buf: [11]u8 = undefined;
   const socket = try server.wl_server.addSocketAuto(&buf);

src/server.zig

@@ -10,6 +10,7 @@ const Cursor = @import("cursor.zig");
 const Keyboard = @import("keyboard.zig");
 const Output = @import("output.zig");
 const View = @import("view.zig");
+const Keymap = @import("keymap.zig");
 
 const gpa = std.heap.c_allocator;
 const server = &@import("main.zig").server;
@@ -32,6 +33,7 @@ root: Root,
 seat: Seat,
 cursor: Cursor,
 keyboard: Keyboard,
+keymaps: std.AutoHashMap(u64, Keymap),
 
 // Backend listeners
 new_input: wl.Listener(*wlr.InputDevice) = .init(handleNewInput),
@@ -69,6 +71,7 @@ pub fn init(self: *Server) !void {
     .seat = undefined,
     .cursor = undefined,
     .keyboard = undefined,
+    .keymaps = .init(gpa),
   };
 
   try self.renderer.initServer(wl_server);