Make key repeat configurable

This creates two input commands for configuring the repeat delay and rate.

Example config:

    input "myidentifier" {
        repeat_delay 250
        repeat_rate 25
    }

include/sway/commands.h

@@ -196,6 +196,8 @@ sway_cmd input_cmd_map_to_output;
 sway_cmd input_cmd_middle_emulation;
 sway_cmd input_cmd_natural_scroll;
 sway_cmd input_cmd_pointer_accel;
+sway_cmd input_cmd_repeat_delay;
+sway_cmd input_cmd_repeat_rate;
 sway_cmd input_cmd_scroll_method;
 sway_cmd input_cmd_tap;
 sway_cmd input_cmd_xkb_layout;

include/sway/config.h

@@ -65,6 +65,8 @@ struct input_config {
 	int middle_emulation;
 	int natural_scroll;
 	float pointer_accel;
+	int repeat_delay;
+	int repeat_rate;
 	int scroll_method;
 	int send_events;
 	int tap;

sway/commands.c

@@ -191,6 +191,8 @@ static struct cmd_handler input_handlers[] = {
 	{ "middle_emulation", input_cmd_middle_emulation },
 	{ "natural_scroll", input_cmd_natural_scroll },
 	{ "pointer_accel", input_cmd_pointer_accel },
+	{ "repeat_delay", input_cmd_repeat_delay },
+	{ "repeat_rate", input_cmd_repeat_rate },
 	{ "scroll_method", input_cmd_scroll_method },
 	{ "tap", input_cmd_tap },
 	{ "xkb_layout", input_cmd_xkb_layout },

sway/commands/input.c

@@ -55,6 +55,10 @@ struct cmd_results *cmd_input(int argc, char **argv) {
 		res = input_cmd_natural_scroll(argc_new, argv_new);
 	} else if (strcasecmp("pointer_accel", argv[1]) == 0) {
 		res = input_cmd_pointer_accel(argc_new, argv_new);
+	} else if (strcasecmp("repeat_delay", argv[1]) == 0) {
+		res = input_cmd_repeat_delay(argc_new, argv_new);
+	} else if (strcasecmp("repeat_rate", argv[1]) == 0) {
+		res = input_cmd_repeat_rate(argc_new, argv_new);
 	} else if (strcasecmp("scroll_method", argv[1]) == 0) {
 		res = input_cmd_scroll_method(argc_new, argv_new);
 	} else if (strcasecmp("tap", argv[1]) == 0) {

sway/commands/input/repeat.c

@@ -0,0 +1,55 @@
+#include <stdlib.h>
+#include <string.h>
+#include "sway/config.h"
+#include "sway/commands.h"
+#include "sway/input/input-manager.h"
+
+struct cmd_results *input_cmd_repeat_delay(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "repeat_delay", EXPECTED_EQUAL_TO, 1))) {
+		return error;
+	}
+	struct input_config *current_input_config =
+		config->handler_context.input_config;
+	if (!current_input_config) {
+		return cmd_results_new(CMD_FAILURE,
+			"repeat_delay", "No input device defined.");
+	}
+	struct input_config *new_config =
+		new_input_config(current_input_config->identifier);
+
+	int repeat_delay = atoi(argv[0]);
+	if (repeat_delay < 0) {
+		return cmd_results_new(CMD_INVALID, "repeat_delay",
+			"Repeat delay cannot be negative");
+	}
+	new_config->repeat_delay = repeat_delay;
+
+	apply_input_config(new_config);
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}
+
+struct cmd_results *input_cmd_repeat_rate(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "repeat_rate", EXPECTED_EQUAL_TO, 1))) {
+		return error;
+	}
+	struct input_config *current_input_config =
+		config->handler_context.input_config;
+	if (!current_input_config) {
+		return cmd_results_new(CMD_FAILURE,
+			"repeat_rate", "No input device defined.");
+	}
+	struct input_config *new_config =
+		new_input_config(current_input_config->identifier);
+
+	int repeat_rate = atoi(argv[0]);
+	if (repeat_rate < 0) {
+		return cmd_results_new(CMD_INVALID, "repeat_rate",
+			"Repeat rate cannot be negative");
+	}
+	new_config->repeat_rate = repeat_rate;
+
+	apply_input_config(new_config);
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}

sway/config/input.c

@@ -29,6 +29,8 @@ struct input_config *new_input_config(const char* identifier) {
 	input->pointer_accel = FLT_MIN;
 	input->scroll_method = INT_MIN;
 	input->left_handed = INT_MIN;
+	input->repeat_delay = INT_MIN;
+	input->repeat_rate = INT_MIN;
 
 	return input;
 }
@@ -59,6 +61,12 @@ void merge_input_config(struct input_config *dst, struct input_config *src) {
 	if (src->pointer_accel != FLT_MIN) {
 		dst->pointer_accel = src->pointer_accel;
 	}
+	if (src->repeat_delay != INT_MIN) {
+		dst->repeat_delay = src->repeat_delay;
+	}
+	if (src->repeat_rate != INT_MIN) {
+		dst->repeat_rate = src->repeat_rate;
+	}
 	if (src->scroll_method != INT_MIN) {
 		dst->scroll_method = src->scroll_method;
 	}

sway/input/keyboard.c

@@ -1,4 +1,5 @@
 #include <assert.h>
+#include <limits.h>
 #include <wlr/backend/multi.h>
 #include <wlr/backend/session.h>
 #include "sway/input/seat.h"
@@ -479,7 +480,13 @@ void sway_keyboard_configure(struct sway_keyboard *keyboard) {
 	keyboard->keymap = keymap;
 	wlr_keyboard_set_keymap(wlr_device->keyboard, keyboard->keymap);
 
-	wlr_keyboard_set_repeat_info(wlr_device->keyboard, 25, 600);
+	if (input_config && input_config->repeat_delay != INT_MIN
+			&& input_config->repeat_rate != INT_MIN) {
+		wlr_keyboard_set_repeat_info(wlr_device->keyboard,
+				input_config->repeat_rate, input_config->repeat_delay);
+	} else {
+		wlr_keyboard_set_repeat_info(wlr_device->keyboard, 25, 600);
+	}
 	xkb_context_unref(context);
 	struct wlr_seat *seat = keyboard->seat_device->sway_seat->wlr_seat;
 	wlr_seat_set_keyboard(seat, wlr_device);

sway/meson.build

@@ -90,6 +90,7 @@ sway_sources = files(
 	'commands/input/middle_emulation.c',
 	'commands/input/natural_scroll.c',
 	'commands/input/pointer_accel.c',
+	'commands/input/repeat.c',
 	'commands/input/scroll_method.c',
 	'commands/input/tap.c',
 	'commands/input/xkb_layout.c',

sway/sway-input.5.txt

@@ -92,6 +92,12 @@ Libinput Configuration
 **input** <identifier> pointer_accel <[-1,1]>::
 	Changes the pointer acceleration for the specified input device.
 
+**input** <identifier> repeat_delay <milliseconds>::
+	Sets the amount of time a key must be held before it starts repeating.
+
+**input** <identifier> repeat_rate <milliseconds>::
+	Sets the frequency of key repeats once the repeat_delay has passed.
+
 **input** <identifier> scroll_method <none|two_finger|edge|on_button_down>::
 	Changes the scroll method for the specified input device.