1 files changed, 127 insertions, 0 deletions
diff --git a/src/Control.zig b/src/Control.zig
new file mode 100644
index 0000000..b870ada
--- /dev/null
+++ b/src/Control.zig
@@ -0,0 +1,127 @@
+// This file is part of river, a dynamic tiling wayland compositor.
+//
+// Copyright 2020 Isaac Freund
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+const Self = @This();
+
+const std = @import("std");
+
+const c = @import("c.zig");
+
+const Command = @import("Command.zig");
+const Log = @import("log.zig").Log;
+const Server = @import("Server.zig");
+
+const protocol_version = 1;
+
+const implementation = c.struct_zriver_control_v1_interface{
+    .run_command = runCommand,
+};
+
+server: *Server,
+wl_global: *c.wl_global,
+
+listen_display_destroy: c.wl_listener,
+
+pub fn init(self: *Self, server: *Server) !void {
+    self.server = server;
+    self.wl_global = c.wl_global_create(
+        server.wl_display,
+        &c.zriver_control_v1_interface,
+        protocol_version,
+        self,
+        bind,
+    ) orelse return error.CantCreateRiverWindowManagementGlobal;
+
+    self.listen_display_destroy.notify = handleDisplayDestroy;
+    c.wl_display_add_destroy_listener(server.wl_display, &self.listen_display_destroy);
+}
+
+fn handleDisplayDestroy(wl_listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
+    const self = @fieldParentPtr(Self, "listen_display_destroy", wl_listener.?);
+    c.wl_global_destroy(self.wl_global);
+}
+
+/// Called when a client binds our global
+fn bind(wl_client: ?*c.wl_client, data: ?*c_void, version: u32, id: u32) callconv(.C) void {
+    const self = @ptrCast(*Self, @alignCast(@alignOf(*Self), data));
+    const wl_resource = c.wl_resource_create(
+        wl_client,
+        &c.zriver_control_v1_interface,
+        @intCast(c_int, version),
+        id,
+    ) orelse {
+        c.wl_client_post_no_memory(wl_client);
+        return;
+    };
+    c.wl_resource_set_implementation(wl_resource, &implementation, self, resourceDestroy);
+}
+
+fn resourceDestroy(wl_resource: ?*c.wl_resource) callconv(.C) void {
+    // TODO
+}
+
+fn runCommand(
+    wl_client: ?*c.wl_client,
+    wl_resource: ?*c.wl_resource,
+    wl_array: ?*c.wl_array,
+    callback_id: u32,
+) callconv(.C) void {
+    const self = @ptrCast(*Self, @alignCast(@alignOf(*Self), c.wl_resource_get_user_data(wl_resource)));
+    const allocator = self.server.allocator;
+
+    var args = std.ArrayList([]const u8).init(allocator);
+
+    var i: usize = 0;
+    const data = @ptrCast([*]const u8, wl_array.?.data);
+    while (i < wl_array.?.size) {
+        const slice = std.mem.spanZ(@ptrCast([*:0]const u8, &data[i]));
+        args.append(std.mem.dupe(allocator, u8, slice) catch unreachable) catch unreachable;
+
+        i += slice.len + 1;
+    }
+
+    const callback_resource = c.wl_resource_create(
+        wl_client,
+        &c.zriver_command_callback_v1_interface,
+        protocol_version,
+        callback_id,
+    ) orelse {
+        c.wl_client_post_no_memory(wl_client);
+        return;
+    };
+
+    c.wl_resource_set_implementation(callback_resource, null, null, null);
+
+    const command = Command.init(args.items, allocator) catch |err| {
+        c.zriver_command_callback_v1_send_failure(
+            callback_resource,
+            switch (err) {
+                Command.Error.NoCommand => "no command given",
+                Command.Error.UnknownCommand => "unknown command",
+                Command.Error.NotEnoughArguments => "not enough arguments",
+                Command.Error.TooManyArguments => "too many arguments",
+                Command.Error.Overflow => "value out of bounds",
+                Command.Error.InvalidCharacter => "invalid character in argument",
+                Command.Error.InvalidDirection => "invalid direction. Must be 'next' or 'previous'",
+                Command.Error.OutOfMemory => unreachable,
+            },
+        );
+        return;
+    };
+    c.zriver_command_callback_v1_send_success(callback_resource);
+    command.run(self.server.input_manager.default_seat);
+}