Add basic input configuration

river/command/input.zig

@@ -0,0 +1,124 @@
+// This file is part of river, a dynamic tiling wayland compositor.
+//
+// Copyright 2021 The River Developers
+//
+// 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 std = @import("std");
+const mem = std.mem;
+
+const server = &@import("../main.zig").server;
+const util = @import("../util.zig");
+const c = @import("../c.zig");
+
+const Error = @import("../command.zig").Error;
+const Seat = @import("../Seat.zig");
+const InputConfig = @import("../InputConfig.zig");
+const InputManager = @import("../InputManager.zig");
+
+pub fn input(
+    allocator: *mem.Allocator,
+    seat: *Seat,
+    args: []const []const u8,
+    out: *?[]const u8,
+) Error!void {
+    if (args.len < 4) return Error.NotEnoughArguments;
+    if (args.len > 4) return Error.TooManyArguments;
+
+    // Try to find an existing InputConfig with matching identifier, or create
+    // a new one if none was found.
+    var new = false;
+    const input_config = for (server.input_manager.input_configs.items) |*input_config| {
+        if (mem.eql(u8, input_config.identifier, args[1])) break input_config;
+    } else blk: {
+        // Use util.gpa instead of allocator to assure the identifier is
+        // allocated by the same allocator as the ArrayList.
+        try server.input_manager.input_configs.ensureUnusedCapacity(1);
+        server.input_manager.input_configs.appendAssumeCapacity(.{
+            .identifier = try util.gpa.dupe(u8, args[1]),
+        });
+        new = true;
+        break :blk &server.input_manager.input_configs.items[server.input_manager.input_configs.items.len - 1];
+    };
+    errdefer {
+        if (new) {
+            var cfg = server.input_manager.input_configs.pop();
+            cfg.deinit();
+        }
+    }
+
+    if (mem.eql(u8, "events", args[2])) {
+        input_config.event_state = std.meta.stringToEnum(InputConfig.EventState, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "accel-profile", args[2])) {
+        input_config.accel_profile = std.meta.stringToEnum(InputConfig.AccelProfile, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "click-method", args[2])) {
+        input_config.click_method = std.meta.stringToEnum(InputConfig.ClickMethod, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "drag", args[2])) {
+        input_config.drag_state = std.meta.stringToEnum(InputConfig.DragState, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "drag-lock", args[2])) {
+        input_config.drag_lock = std.meta.stringToEnum(InputConfig.DragLock, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "disable-while-typing", args[2])) {
+        input_config.dwt_state = std.meta.stringToEnum(InputConfig.DwtState, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "middle-emulation", args[2])) {
+        input_config.middle_emulation = std.meta.stringToEnum(InputConfig.MiddleEmulation, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "natural-scroll", args[2])) {
+        input_config.natural_scroll = std.meta.stringToEnum(InputConfig.NaturalScroll, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "left-handed", args[2])) {
+        input_config.left_handed = std.meta.stringToEnum(InputConfig.LeftHanded, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "tap", args[2])) {
+        input_config.tap_state = std.meta.stringToEnum(InputConfig.TapState, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "tap-button-map", args[2])) {
+        input_config.tap_button_map = std.meta.stringToEnum(InputConfig.TapButtonMap, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "pointer-accel", args[2])) {
+        input_config.pointer_accel = InputConfig.PointerAccel{
+            .value = std.math.clamp(
+                try std.fmt.parseFloat(f32, args[3]),
+                @as(f32, -1.0),
+                @as(f32, 1.0),
+            ),
+        };
+    } else if (mem.eql(u8, "scroll-method", args[2])) {
+        input_config.scroll_method = std.meta.stringToEnum(InputConfig.ScrollMethod, args[3]) orelse
+            return Error.UnknownOption;
+    } else if (mem.eql(u8, "scroll-button", args[2])) {
+        const event_code_name = try std.cstr.addNullByte(allocator, args[3]);
+        defer allocator.free(event_code_name);
+        const ret = c.libevdev_event_code_from_name(c.EV_KEY, event_code_name);
+        if (ret < 1) return Error.InvalidButton;
+        input_config.scroll_button = InputConfig.ScrollButton{ .button = @intCast(u32, ret) };
+    } else {
+        return Error.UnknownCommand;
+    }
+
+    // Update matching existing input devices.
+    var it = server.input_manager.input_devices.first;
+    while (it) |device_node| : (it = device_node.next) {
+        if (mem.eql(u8, device_node.data.identifier, args[1])) {
+            input_config.apply(&device_node.data);
+            // We don't break here because it is common to have multiple input
+            // devices with the same identifier.
+        }
+    }
+}