text: /* Copyright (c) 2012, Bastien Dejean
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdbool.h>
  #include <stdarg.h>
  #include <inttypes.h>
  #include <unistd.h>
  #include "bspwm.h"
  #include "desktop.h"
  #include "monitor.h"
  #include "pointer.h"
  #include "query.h"
  #include "rule.h"
  #include "restore.h"
  #include "settings.h"
  #include "tree.h"
  #include "window.h"
  #include "common.h"
  #include "parse.h"
  #include "messages.h"
  
  void handle_message(char *msg, int msg_len, FILE *rsp)
  {
  	int cap = INIT_CAP;
  	int num = 0;
  	char **args = calloc(cap, sizeof(char *));
  
  	if (args == NULL) {
  		perror("Handle message: calloc");
  		return;
  	}
  
  	for (int i = 0, j = 0; i < msg_len; i++) {
  		if (msg[i] == 0) {
  			args[num++] = msg + j;
  			j = i + 1;
  		}
  		if (num >= cap) {
  			cap *= 2;
  			char **new = realloc(args, cap * sizeof(char *));
  			if (new == NULL) {
  				free(args);
  				perror("Handle message: realloc");
  				return;
  			} else {
  				args = new;
  			}
  		}
  	}
  
  	if (num < 1) {
  		free(args);
  		fail(rsp, "No arguments given.\n");
  		return;
  	}
  
  	char **args_orig = args;
  	process_message(args, num, rsp);
  	free(args_orig);
  }
  
  void process_message(char **args, int num, FILE *rsp)
  {
  	if (streq("node", *args)) {
  		cmd_node(++args, --num, rsp);
  	} else if (streq("desktop", *args)) {
  		cmd_desktop(++args, --num, rsp);
  	} else if (streq("monitor", *args)) {
  		cmd_monitor(++args, --num, rsp);
  	} else if (streq("query", *args)) {
  		cmd_query(++args, --num, rsp);
  	} else if (streq("subscribe", *args)) {
  		cmd_subscribe(++args, --num, rsp);
  		return;
  	} else if (streq("wm", *args)) {
  		cmd_wm(++args, --num, rsp);
  	} else if (streq("rule", *args)) {
  		cmd_rule(++args, --num, rsp);
  	} else if (streq("config", *args)) {
  		cmd_config(++args, --num, rsp);
  	} else if (streq("quit", *args)) {
  		cmd_quit(++args, --num, rsp);
  	} else {
  		fail(rsp, "Unknown domain or command: '%s'.\n", *args);
  	}
  
  	fflush(rsp);
  	fclose(rsp);
  }
  
  void cmd_node(char **args, int num, FILE *rsp)
  {
  	if (num < 1) {
  		fail(rsp, "node: Missing arguments.\n");
  		return;
  	}
  
  	coordinates_t ref = {mon, mon->desk, mon->desk->focus};
  	coordinates_t trg = ref;
  
  	if ((*args)[0] != OPT_CHR) {
  		int ret;
  		if ((ret = node_from_desc(*args, &ref, &trg)) == SELECTOR_OK) {
  			num--, args++;
  		} else {
  			handle_failure(ret, "node", *args, rsp);
  			return;
  		}
  	}
  
  	if (num < 1) {
  		fail(rsp, "node: Missing commands.\n");
  		return;
  	}
  
  	bool changed = false;
  
  	while (num > 0) {
  		if (streq("-f", *args) || streq("--focus", *args)) {
  			coordinates_t dst = trg;
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				if ((ret = node_from_desc(*args, &ref, &dst)) != SELECTOR_OK) {
  					handle_failure(ret, "node -f", *args, rsp);
  					break;
  				}
  			}
  			if (dst.node == NULL || !focus_node(dst.monitor, dst.desktop, dst.node)) {
  				fail(rsp, "");
  				break;
  			}
  		} else if (streq("-a", *args) || streq("--activate", *args)) {
  			coordinates_t dst = trg;
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				if ((ret = node_from_desc(*args, &ref, &dst)) != SELECTOR_OK) {
  					handle_failure(ret, "node -a", *args, rsp);
  					break;
  				}
  			}
  			if (dst.node == NULL || !activate_node(dst.monitor, dst.desktop, dst.node)) {
  				fail(rsp, "");
  				break;
  			}
  		} else if (streq("-d", *args) || streq("--to-desktop", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			coordinates_t dst;
  			int ret;
  			if ((ret = desktop_from_desc(*args, &ref, &dst)) == SELECTOR_OK) {
  				bool follow = false;
  				if (num > 1 && streq("--follow", *(args+1))) {
  					follow = true;
  					num--, args++;
  				}
  				if (transfer_node(trg.monitor, trg.desktop, trg.node, dst.monitor, dst.desktop, dst.desktop->focus, follow)) {
  					trg.monitor = dst.monitor;
  					trg.desktop = dst.desktop;
  				} else {
  					fail(rsp, "");
  					break;
  				}
  			} else {
  				handle_failure(ret, "node -d", *args, rsp);
  				break;
  			}
  		} else if (streq("-m", *args) || streq("--to-monitor", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			coordinates_t dst;
  			int ret;
  			if ((ret = monitor_from_desc(*args, &ref, &dst)) == SELECTOR_OK) {
  				bool follow = false;
  				if (num > 1 && streq("--follow", *(args+1))) {
  					follow = true;
  					num--, args++;
  				}
  				if (transfer_node(trg.monitor, trg.desktop, trg.node, dst.monitor, dst.monitor->desk, dst.monitor->desk->focus, follow)) {
  					trg.monitor = dst.monitor;
  					trg.desktop = dst.monitor->desk;
  				} else {
  					fail(rsp, "");
  					break;
  				}
  			} else {
  				handle_failure(ret, "node -m", *args, rsp);
  				break;
  			}
  		} else if (streq("-n", *args) || streq("--to-node", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			coordinates_t dst;
  			int ret;
  			if ((ret = node_from_desc(*args, &ref, &dst)) == SELECTOR_OK) {
  				bool follow = false;
  				if (num > 1 && streq("--follow", *(args+1))) {
  					follow = true;
  					num--, args++;
  				}
  				if (transfer_node(trg.monitor, trg.desktop, trg.node, dst.monitor, dst.desktop, dst.node, follow)) {
  					trg.monitor = dst.monitor;
  					trg.desktop = dst.desktop;
  				} else {
  					fail(rsp, "");
  					break;
  				}
  			} else {
  				handle_failure(ret, "node -n", *args, rsp);
  				break;
  			}
  		} else if (streq("-s", *args) || streq("--swap", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			coordinates_t dst;
  			int ret;
  			if ((ret = node_from_desc(*args, &ref, &dst)) == SELECTOR_OK) {
  				bool follow = false;
  				if (num > 1 && streq("--follow", *(args+1))) {
  					follow = true;
  					num--, args++;
  				}
  				if (swap_nodes(trg.monitor, trg.desktop, trg.node, dst.monitor, dst.desktop, dst.node, follow)) {
  					trg.monitor = dst.monitor;
  					trg.desktop = dst.desktop;
  				} else {
  					fail(rsp, "");
  					break;
  				}
  			} else {
  				handle_failure(ret, "node -s", *args, rsp);
  				break;
  			}
  		} else if (streq("-l", *args) || streq("--layer", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			stack_layer_t lyr;
  			if (parse_stack_layer(*args, &lyr)) {
  				if (!set_layer(trg.monitor, trg.desktop, trg.node, lyr)) {
  					fail(rsp, "");
  					break;
  				}
  			} else {
  				fail(rsp, "node %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				break;
  			}
  		} else if (streq("-t", *args) || streq("--state", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			client_state_t cst;
  			bool alternate = false;
  			if ((*args)[0] == '~') {
  				alternate = true;
  				(*args)++;
  			}
  			if (alternate && (*args)[0] == '\0') {
  				if (trg.node != NULL && trg.node->client != NULL) {
  					cst = trg.node->client->last_state;
  				} else {
  					fail(rsp, "");
  					break;
  				}
  			} else if (parse_client_state(*args, &cst)) {
  				if (alternate && trg.node != NULL && trg.node->client != NULL &&
  				    trg.node->client->state == cst) {
  					cst = trg.node->client->last_state;
  				}
  			} else {
  				fail(rsp, "node %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				break;
  			}
  			if (!set_state(trg.monitor, trg.desktop, trg.node, cst)) {
  				fail(rsp, "");
  				break;
  			}
  			changed = true;
  		} else if (streq("-g", *args) || streq("--flag", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (trg.node == NULL) {
  				fail(rsp, "");
  				break;
  			}
  			char *key = strtok(*args, EQL_TOK);
  			char *val = strtok(NULL, EQL_TOK);
  			alter_state_t a;
  			bool b;
  			if (val == NULL) {
  				a = ALTER_TOGGLE;
  			} else {
  				if (parse_bool(val, &b)) {
  					a = ALTER_SET;
  				} else {
  					fail(rsp, "node %s: Invalid value for %s: '%s'.\n", *(args - 1), key, val);
  					break;
  				}
  			}
  			if (streq("hidden", key)) {
  				set_hidden(trg.monitor, trg.desktop, trg.node, (a == ALTER_SET ? b : !trg.node->hidden));
  				changed = true;
  			} else if (streq("sticky", key)) {
  				set_sticky(trg.monitor, trg.desktop, trg.node, (a == ALTER_SET ? b : !trg.node->sticky));
  			} else if (streq("private", key)) {
  				set_private(trg.monitor, trg.desktop, trg.node, (a == ALTER_SET ? b : !trg.node->private));
  			} else if (streq("locked", key)) {
  				set_locked(trg.monitor, trg.desktop, trg.node, (a == ALTER_SET ? b : !trg.node->locked));
  			} else if (streq("marked", key)) {
  				set_marked(trg.monitor, trg.desktop, trg.node, (a == ALTER_SET ? b : !trg.node->marked));
  			} else {
  				fail(rsp, "node %s: Invalid key: '%s'.\n", *(args - 1), key);
  				break;
  			}
  		} else if (streq("-p", *args) || streq("--presel-dir", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (trg.node == NULL || trg.node->vacant) {
  				fail(rsp, "");
  				break;
  			}
  			if (streq("cancel", *args)) {
  				cancel_presel(trg.monitor, trg.desktop, trg.node);
  			} else {
  				bool alternate = false;
  				if ((*args)[0] == '~') {
  					alternate = true;
  					(*args)++;
  				}
  				direction_t dir;
  				if (parse_direction(*args, &dir)) {
  					if (alternate && trg.node->presel != NULL && trg.node->presel->split_dir == dir) {
  						cancel_presel(trg.monitor, trg.desktop, trg.node);
  					} else {
  						presel_dir(trg.monitor, trg.desktop, trg.node, dir);
  						if (!IS_RECEPTACLE(trg.node)) {
  							draw_presel_feedback(trg.monitor, trg.desktop, trg.node);
  						}
  					}
  				} else {
  					fail(rsp, "node %s: Invalid argument: '%s%s'.\n", *(args - 1), alternate?"~":"", *args);
  					break;
  				}
  			}
  		} else if (streq("-o", *args) || streq("--presel-ratio", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (trg.node == NULL || trg.node->vacant) {
  				fail(rsp, "");
  				break;
  			}
  			double rat;
  			if (sscanf(*args, "%lf", &rat) != 1 || rat <= 0 || rat >= 1) {
  				fail(rsp, "node %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				break;
  			} else {
  				presel_ratio(trg.monitor, trg.desktop, trg.node, rat);
  				draw_presel_feedback(trg.monitor, trg.desktop, trg.node);
  			}
  		} else if (streq("-v", *args) || streq("--move", *args)) {
  			num--, args++;
  			if (num < 2) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			int dx = 0, dy = 0;
  			if (sscanf(*args, "%i", &dx) == 1) {
  				num--, args++;
  				if (sscanf(*args, "%i", &dy) == 1) {
  					if (!move_client(&trg, dx, dy)) {
  						fail(rsp, "");
  						break;
  					}
  				} else {
  					fail(rsp, "node %s: Invalid dy argument: '%s'.\n", *(args - 3), *args);
  					break;
  				}
  			} else {
  				fail(rsp, "node %s: Invalid dx argument: '%s'.\n", *(args - 2), *args);
  				break;
  			}
  		} else if (streq("-z", *args) || streq("--resize", *args)) {
  			num--, args++;
  			if (num < 3) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			resize_handle_t rh;
  			if (parse_resize_handle(*args, &rh)) {
  				num--, args++;
  				int dx = 0, dy = 0;
  				if (sscanf(*args, "%i", &dx) == 1) {
  					num--, args++;
  					if (sscanf(*args, "%i", &dy) == 1) {
  						if (!resize_client(&trg, rh, dx, dy, true)) {
  							fail(rsp, "");
  							break;
  						}
  					} else {
  						fail(rsp, "node %s: Invalid dy argument: '%s'.\n", *(args - 3), *args);
  						break;
  					}
  				} else {
  					fail(rsp, "node %s: Invalid dx argument: '%s'.\n", *(args - 2), *args);
  					break;
  				}
  			} else {
  				fail(rsp, "node %s: Invalid resize handle argument: '%s'.\n", *(args - 1), *args);
  				break;
  			}
  		} else if (streq("-y", *args) || streq("--type", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (trg.node == NULL) {
  				fail(rsp, "");
  				break;
  			}
  			split_type_t typ;
  			if (parse_split_type(*args, &typ)) {
  				set_type(trg.node, typ);
  				changed = true;
  			} else {
  				fail(rsp, "");
  				break;
  			}
  		} else if (streq("-r", *args) || streq("--ratio", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (trg.node == NULL) {
  				fail(rsp, "");
  				break;
  			}
  			if ((*args)[0] == '+' || (*args)[0] == '-') {
  				float delta;
  				if (sscanf(*args, "%f", &delta) == 1) {
  					double rat = trg.node->split_ratio;
  					if (delta > -1 && delta < 1) {
  						rat += delta;
  					} else {
  						int max = (trg.node->split_type == TYPE_HORIZONTAL ? trg.node->rectangle.height : trg.node->rectangle.width);
  						rat = ((max * rat) + delta) / max;
  					}
  					if (rat > 0 && rat < 1) {
  						set_ratio(trg.node, rat);
  					} else {
  						fail(rsp, "");
  						break;
  					}
  				} else {
  					fail(rsp, "node %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  					break;
  				}
  			} else {
  				double rat;
  				if (sscanf(*args, "%lf", &rat) == 1 && rat > 0 && rat < 1) {
  					set_ratio(trg.node, rat);
  				} else {
  					fail(rsp, "node %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  					break;
  				}
  			}
  			changed = true;
  		} else if (streq("-F", *args) || streq("--flip", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (trg.node == NULL) {
  				fail(rsp, "");
  				break;
  			}
  			flip_t flp;
  			if (parse_flip(*args, &flp)) {
  				flip_tree(trg.node, flp);
  				changed = true;
  			} else {
  				fail(rsp, "");
  				break;
  			}
  		} else if (streq("-R", *args) || streq("--rotate", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (trg.node == NULL) {
  				fail(rsp, "");
  				break;
  			}
  			int deg;
  			if (parse_degree(*args, &deg)) {
  				rotate_tree(trg.node, deg);
  				changed = true;
  			} else {
  				fail(rsp, "node %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				break;
  			}
  		} else if (streq("-E", *args) || streq("--equalize", *args)) {
  			if (trg.node == NULL) {
  				fail(rsp, "");
  				break;
  			}
  			equalize_tree(trg.node);
  			changed = true;
  		} else if (streq("-B", *args) || streq("--balance", *args)) {
  			if (trg.node == NULL) {
  				fail(rsp, "");
  				break;
  			}
  			balance_tree(trg.node);
  			changed = true;
  		} else if (streq("-C", *args) || streq("--circulate", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "node %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (trg.node == NULL) {
  				fail(rsp, "");
  				break;
  			}
  			circulate_dir_t cir;
  			if (parse_circulate_direction(*args, &cir)) {
  				circulate_leaves(trg.monitor, trg.desktop, trg.node, cir);
  				changed = true;
  			} else {
  				fail(rsp, "node %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				break;
  			}
  		} else if (streq("-i", *args) || streq("--insert-receptacle", *args)) {
  			insert_receptacle(trg.monitor, trg.desktop, trg.node);
  			changed = true;
  		} else if (streq("-c", *args) || streq("--close", *args)) {
  			if (num > 1) {
  				fail(rsp, "node %s: Trailing commands.\n", *args);
  				break;
  			}
  			if (trg.node == NULL || locked_count(trg.node) > 0) {
  				fail(rsp, "");
  				break;
  			}
  			close_node(trg.node);
  			break;
  		} else if (streq("-k", *args) || streq("--kill", *args)) {
  			if (num > 1) {
  				fail(rsp, "node %s: Trailing commands.\n", *args);
  				break;
  			}
  			if (trg.node == NULL) {
  				fail(rsp, "");
  				break;
  			}
  			kill_node(trg.monitor, trg.desktop, trg.node);
  			changed = true;
  			break;
  		} else {
  			fail(rsp, "node: Unknown command: '%s'.\n", *args);
  			break;
  		}
  
  		num--, args++;
  	}
  
  	if (changed) {
  		arrange(trg.monitor, trg.desktop);
  	}
  }
  
  void cmd_desktop(char **args, int num, FILE *rsp)
  {
  	if (num < 1) {
  		fail(rsp, "desktop: Missing arguments.\n");
  		return;
  	}
  
  	coordinates_t ref = {mon, mon->desk, NULL};
  	coordinates_t trg = ref;
  
  	if ((*args)[0] != OPT_CHR) {
  		int ret;
  		if ((ret = desktop_from_desc(*args, &ref, &trg)) == SELECTOR_OK) {
  			num--, args++;
  		} else {
  			handle_failure(ret, "desktop", *args, rsp);
  			return;
  		}
  	}
  
  	if (num < 1) {
  		fail(rsp, "desktop: Missing commands.\n");
  		return;
  	}
  
  	bool changed = false;
  
  	while (num > 0) {
  		if (streq("-f", *args) || streq("--focus", *args)) {
  			coordinates_t dst = trg;
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				if ((ret = desktop_from_desc(*args, &ref, &dst)) != SELECTOR_OK) {
  					handle_failure(ret, "desktop -f", *args, rsp);
  					break;
  				}
  			}
  			focus_node(dst.monitor, dst.desktop, NULL);
  		} else if (streq("-a", *args) || streq("--activate", *args)) {
  			coordinates_t dst = trg;
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				if ((ret = desktop_from_desc(*args, &ref, &dst)) != SELECTOR_OK) {
  					handle_failure(ret, "desktop -a", *args, rsp);
  					break;
  				}
  			}
  			if (activate_desktop(dst.monitor, dst.desktop)) {
  				activate_node(dst.monitor, dst.desktop, NULL);
  			} else {
  				fail(rsp, "");
  				break;
  			}
  		} else if (streq("-m", *args) || streq("--to-monitor", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "desktop %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (trg.monitor->desk_head == trg.monitor->desk_tail) {
  				fail(rsp, "");
  				break;
  			}
  			coordinates_t dst;
  			int ret;
  			if ((ret = monitor_from_desc(*args, &ref, &dst)) == SELECTOR_OK) {
  				bool follow = false;
  				if (num > 1 && streq("--follow", *(args+1))) {
  					follow = true;
  					num--, args++;
  				}
  				if (transfer_desktop(trg.monitor, dst.monitor, trg.desktop, follow)) {
  					trg.monitor = dst.monitor;
  				} else {
  					fail(rsp, "");
  					break;
  				}
  			} else {
  				handle_failure(ret, "desktop -m", *args, rsp);
  				break;
  			}
  		} else if (streq("-s", *args) || streq("--swap", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "desktop %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			coordinates_t dst;
  			int ret;
  			if ((ret = desktop_from_desc(*args, &ref, &dst)) == SELECTOR_OK) {
  				bool follow = false;
  				if (num > 1 && streq("--follow", *(args+1))) {
  					follow = true;
  					num--, args++;
  				}
  				if (swap_desktops(trg.monitor, trg.desktop, dst.monitor, dst.desktop, follow)) {
  					trg.monitor = dst.monitor;
  				} else {
  					fail(rsp, "");
  					break;
  				}
  			} else {
  				handle_failure(ret, "desktop -s", *args, rsp);
  				break;
  			}
  		} else if (streq("-b", *args) || streq("--bubble", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "desktop %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			cycle_dir_t cyc;
  			if (parse_cycle_direction(*args, &cyc)) {
  				desktop_t *d = trg.desktop;
  				if (cyc == CYCLE_PREV) {
  					if (d->prev == NULL) {
  						while (d->next != NULL) {
  							swap_desktops(trg.monitor, d, trg.monitor, d->next, false);
  						}
  					} else {
  						swap_desktops(trg.monitor, d, trg.monitor, d->prev, false);
  					}
  				} else {
  					if (d->next == NULL) {
  						while (d->prev != NULL) {
  							swap_desktops(trg.monitor, d, trg.monitor, d->prev, false);
  						}
  					} else {
  						swap_desktops(trg.monitor, d, trg.monitor, d->next, false);
  					}
  				}
  			} else {
  				fail(rsp, "desktop %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				break;
  			}
  		} else if (streq("-l", *args) || streq("--layout", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "desktop %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			bool ret;
  			layout_t lyt;
  			cycle_dir_t cyc;
  			if (parse_cycle_direction(*args, &cyc)) {
  				ret = set_layout(trg.monitor, trg.desktop, (trg.desktop->user_layout + 1) % 2, true);
  			} else if (parse_layout(*args, &lyt)) {
  				ret = set_layout(trg.monitor, trg.desktop, lyt, true);
  			} else {
  				fail(rsp, "desktop %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				break;
  			}
  			if (!ret) {
  				fail(rsp, "");
  				break;
  			}
  		} else if (streq("-n", *args) || streq("--rename", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "desktop %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			rename_desktop(trg.monitor, trg.desktop, *args);
  		} else if (streq("-r", *args) || streq("--remove", *args)) {
  			if (num > 1) {
  				fail(rsp, "desktop %s: Trailing commands.\n", *args);
  				break;
  			}
  			if (trg.monitor->desk_head != trg.monitor->desk_tail) {
  				desktop_t *fallback = trg.desktop->prev == NULL ?
  				                      trg.desktop->next :
  				                      trg.desktop->prev;
  				merge_desktops(trg.monitor, trg.desktop, trg.monitor, fallback);
  				remove_desktop(trg.monitor, trg.desktop);
  				return;
  			} else {
  				fail(rsp, "");
  				break;
  			}
  		} else {
  			fail(rsp, "desktop: Unknown command: '%s'.\n", *args);
  			break;
  		}
  		num--, args++;
  	}
  
  	if (changed) {
  		arrange(trg.monitor, trg.desktop);
  	}
  }
  
  void cmd_monitor(char **args, int num, FILE *rsp)
  {
  	if (num < 1) {
  		fail(rsp, "monitor: Missing arguments.\n");
  		return;
  	}
  
  	coordinates_t ref = {mon, NULL, NULL};
  	coordinates_t trg = ref;
  
  	if ((*args)[0] != OPT_CHR) {
  		int ret;
  		if ((ret = monitor_from_desc(*args, &ref, &trg)) == SELECTOR_OK) {
  			num--, args++;
  		} else {
  			handle_failure(ret, "monitor", *args, rsp);
  			return;
  		}
  	}
  
  	if (num < 1) {
  		fail(rsp, "monitor: Missing commands.\n");
  		return;
  	}
  
  	while (num > 0) {
  		if (streq("-f", *args) || streq("--focus", *args)) {
  			coordinates_t dst = trg;
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				if ((ret = monitor_from_desc(*args, &ref, &dst)) != SELECTOR_OK) {
  					handle_failure(ret, "monitor -f", *args, rsp);
  					fail(rsp, "");
  					return;
  				}
  			}
  			focus_node(dst.monitor, NULL, NULL);
  		} else if (streq("-s", *args) || streq("--swap", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "monitor %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			coordinates_t dst;
  			int ret;
  			if ((ret = monitor_from_desc(*args, &ref, &dst)) == SELECTOR_OK) {
  				if (!swap_monitors(trg.monitor, dst.monitor)) {
  					fail(rsp, "");
  					return;
  				}
  			} else {
  				handle_failure(ret, "monitor -s", *args, rsp);
  				return;
  			}
  		} else if (streq("-d", *args) || streq("--reset-desktops", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "monitor %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			desktop_t *d = trg.monitor->desk_head;
  			while (num > 0 && d != NULL) {
  				rename_desktop(trg.monitor, d, *args);
  				d = d->next;
  				num--, args++;
  			}
  			put_status(SBSC_MASK_REPORT);
  			while (num > 0) {
  				add_desktop(trg.monitor, make_desktop(*args, XCB_NONE));
  				num--, args++;
  			}
  			while (d != NULL) {
  				desktop_t *next = d->next;
  				if (d == mon->desk) {
  					focus_node(trg.monitor, d->prev, d->prev->focus);
  				}
  				merge_desktops(trg.monitor, d, mon, mon->desk);
  				remove_desktop(trg.monitor, d);
  				d = next;
  			}
  		} else if (streq("-a", *args) || streq("--add-desktops", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "monitor %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			while (num > 0) {
  				add_desktop(trg.monitor, make_desktop(*args, XCB_NONE));
  				num--, args++;
  			}
  		} else if (streq("-r", *args) || streq("--remove", *args)) {
  			if (num > 1) {
  				fail(rsp, "monitor %s: Trailing commands.\n", *args);
  				return;
  			}
  			if (mon_head == mon_tail) {
  				fail(rsp, "");
  				return;
  			}
  			remove_monitor(trg.monitor);
  			return;
  		} else if (streq("-o", *args) || streq("--reorder-desktops", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "monitor %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			desktop_t *d = trg.monitor->desk_head;
  			while (d != NULL && num > 0) {
  				desktop_t *next = d->next;
  				coordinates_t dst;
  				if (locate_desktop(*args, &dst) && dst.monitor == trg.monitor) {
  					swap_desktops(trg.monitor, d, dst.monitor, dst.desktop, false);
  					if (next == dst.desktop) {
  						next = d;
  					}
  				}
  				d = next;
  				num--, args++;
  			}
  		} else if (streq("-g", *args) || streq("--rectangle", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "monitor %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			xcb_rectangle_t r;
  			if (parse_rectangle(*args, &r)) {
  				update_root(trg.monitor, &r);
  			} else {
  				fail(rsp, "monitor %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				return;
  			}
  		} else if (streq("-n", *args) || streq("--rename", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "monitor %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			rename_monitor(trg.monitor, *args);
  		} else {
  			fail(rsp, "monitor: Unknown command: '%s'.\n", *args);
  			return;
  		}
  		num--, args++;
  	}
  }
  
  void cmd_query(char **args, int num, FILE *rsp)
  {
  	coordinates_t monitor_ref = {mon, NULL, NULL};
  	coordinates_t desktop_ref = {mon, mon->desk, NULL};
  	coordinates_t node_ref = {mon, mon->desk, mon->desk->focus};
  	coordinates_t trg = {NULL, NULL, NULL};
  	monitor_select_t *monitor_sel = NULL;
  	desktop_select_t *desktop_sel = NULL;
  	node_select_t *node_sel = NULL;
  	domain_t dom = DOMAIN_TREE;
  	bool print_ids = true;
  	uint8_t d = 0;
  
  	if (num < 1) {
  		fail(rsp, "query: Missing arguments.\n");
  		return;
  	}
  
  	while (num > 0) {
  		if (streq("-T", *args) || streq("--tree", *args)) {
  			dom = DOMAIN_TREE, d++;
  		} else if (streq("-M", *args) || streq("--monitors", *args)) {
  			dom = DOMAIN_MONITOR, d++;
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				coordinates_t tmp = monitor_ref;
  				monitor_ref.desktop = NULL;
  				monitor_ref.node = NULL;
  				if ((ret = monitor_from_desc(*args, &tmp, &monitor_ref)) != SELECTOR_OK) {
  					handle_failure(ret, "query -M", *args, rsp);
  					goto end;
  				}
  			}
  		} else if (streq("-D", *args) || streq("--desktops", *args)) {
  			dom = DOMAIN_DESKTOP, d++;
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				coordinates_t tmp = desktop_ref;
  				desktop_ref.node = NULL;
  				if ((ret = desktop_from_desc(*args, &tmp, &desktop_ref)) != SELECTOR_OK) {
  					handle_failure(ret, "query -D", *args, rsp);
  					goto end;
  				}
  			}
  		} else if (streq("-N", *args) || streq("--nodes", *args)) {
  			dom = DOMAIN_NODE, d++;
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				coordinates_t tmp = node_ref;
  				if ((ret = node_from_desc(*args, &tmp, &node_ref)) != SELECTOR_OK) {
  					handle_failure(ret, "query -N", *args, rsp);
  					goto end;
  				}
  			}
  		} else if (streq("-m", *args) || streq("--monitor", *args)) {
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				if ((*args)[0] == '.') {
  					free(monitor_sel);
  					monitor_sel = malloc(sizeof(monitor_select_t));
  					*monitor_sel = make_monitor_select();
  					char *desc = copy_string(*args, strlen(*args));
  					if (!parse_monitor_modifiers(desc, monitor_sel)) {
  						handle_failure(SELECTOR_BAD_MODIFIERS, "query -m", *args, rsp);
  						free(desc);
  						goto end;
  					}
  					free(desc);
  				} else if ((ret = monitor_from_desc(*args, &monitor_ref, &trg)) != SELECTOR_OK) {
  					handle_failure(ret, "query -m", *args, rsp);
  					goto end;
  				}
  			} else {
  				trg = monitor_ref;
  			}
  		} else if (streq("-d", *args) || streq("--desktop", *args)) {
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				if ((*args)[0] == '.') {
  					free(desktop_sel);
  					desktop_sel = malloc(sizeof(desktop_select_t));
  					*desktop_sel = make_desktop_select();
  					char *desc = copy_string(*args, strlen(*args));
  					if (!parse_desktop_modifiers(desc, desktop_sel)) {
  						handle_failure(SELECTOR_BAD_MODIFIERS, "query -d", *args, rsp);
  						free(desc);
  						goto end;
  					}
  					free(desc);
  				} else if ((ret = desktop_from_desc(*args, &desktop_ref, &trg)) != SELECTOR_OK) {
  					handle_failure(ret, "query -d", *args, rsp);
  					goto end;
  				}
  			} else {
  				trg = desktop_ref;
  			}
  		} else if (streq("-n", *args) || streq("--node", *args)) {
  			if (num > 1 && *(args + 1)[0] != OPT_CHR) {
  				num--, args++;
  				int ret;
  				if ((*args)[0] == '.') {
  					free(node_sel);
  					node_sel = malloc(sizeof(node_select_t));
  					*node_sel = make_node_select();
  					char *desc = copy_string(*args, strlen(*args));
  					if (!parse_node_modifiers(desc, node_sel)) {
  						handle_failure(SELECTOR_BAD_MODIFIERS, "query -n", *args, rsp);
  						free(desc);
  						goto end;
  					}
  					free(desc);
  				} else if ((ret = node_from_desc(*args, &node_ref, &trg)) != SELECTOR_OK) {
  					handle_failure(ret, "query -n", *args, rsp);
  					goto end;
  				}
  			} else {
  				trg = node_ref;
  				if (trg.node == NULL) {
  					fail(rsp, "");
  					goto end;
  				}
  			}
  		} else if (streq("--names", *args)) {
  			print_ids = false;
  		} else {
  			fail(rsp, "query: Unknown option: '%s'.\n", *args);
  			goto end;
  		}
  		num--, args++;
  	}
  
  	if (d < 1) {
  		fail(rsp, "query: No commands given.\n");
  		goto end;
  	}
  
  	if (d > 1) {
  		fail(rsp, "query: Multiple commands given.\n");
  		goto end;
  	}
  
  	if (dom == DOMAIN_TREE && trg.monitor == NULL) {
  		fail(rsp, "query -T: No options given.\n");
  		goto end;
  	}
  
  	if (!print_ids && (dom == DOMAIN_NODE || dom == DOMAIN_TREE)) {
  		fail(rsp, "query -%c: --names only applies to -M and -D.\n", dom == DOMAIN_NODE ? 'N' : 'T');
  		goto end;
  	}
  
  	if ((dom == DOMAIN_MONITOR && (desktop_sel != NULL || node_sel != NULL)) ||
  	    (dom == DOMAIN_DESKTOP && node_sel != NULL)) {
  		fail(rsp, "query -%c: Incompatible descriptor-free constraints.\n", dom == DOMAIN_MONITOR ? 'M' : 'D');
  		goto end;
  	}
  
  	if (dom == DOMAIN_NODE) {
  		if (query_node_ids(&monitor_ref, &desktop_ref, &node_ref, &trg, monitor_sel, desktop_sel, node_sel, rsp) < 1) {
  			fail(rsp, "");
  		}
  	} else if (dom == DOMAIN_DESKTOP) {
  		if (query_desktop_ids(&monitor_ref, &desktop_ref, &trg, monitor_sel, desktop_sel, print_ids ? fprint_desktop_id : fprint_desktop_name, rsp) < 1) {
  			fail(rsp, "");
  		}
  	} else if (dom == DOMAIN_MONITOR) {
  		if (query_monitor_ids(&monitor_ref, &trg, monitor_sel, print_ids ? fprint_monitor_id : fprint_monitor_name, rsp) < 1) {
  			fail(rsp, "");
  		}
  	} else {
  		if (trg.node != NULL) {
  			query_node(trg.node, rsp);
  		} else if (trg.desktop != NULL) {
  			query_desktop(trg.desktop, rsp);
  		} else  {
  			query_monitor(trg.monitor, rsp);
  		}
  		fprintf(rsp, "\n");
  	}
  
  end:
  	free(monitor_sel);
  	free(desktop_sel);
  	free(node_sel);
  }
  
  void cmd_rule(char **args, int num, FILE *rsp)
  {
  	if (num < 1) {
  		fail(rsp, "rule: Missing commands.\n");
  		return;
  	}
  
  	while (num > 0) {
  		if (streq("-a", *args) || streq("--add", *args)) {
  			num--, args++;
  			if (num < 2) {
  				fail(rsp, "rule %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			rule_t *rule = make_rule();
  			char *class_name = strtok(*args, COL_TOK);
  			char *instance_name = strtok(NULL, COL_TOK);
  			char *name = strtok(NULL, COL_TOK);
  			snprintf(rule->class_name, sizeof(rule->class_name), "%s", class_name);
  			snprintf(rule->instance_name, sizeof(rule->instance_name), "%s", instance_name==NULL?MATCH_ANY:instance_name);
  			snprintf(rule->name, sizeof(rule->name), "%s", name==NULL?MATCH_ANY:name);
  			num--, args++;
  			size_t i = 0;
  			while (num > 0) {
  				if (streq("-o", *args) || streq("--one-shot", *args)) {
  					rule->one_shot = true;
  				} else {
  					for (size_t j = 0; i < sizeof(rule->effect) && j < strlen(*args); i++, j++) {
  						rule->effect[i] = (*args)[j];
  					}
  					if (num > 1 && i < sizeof(rule->effect)) {
  						rule->effect[i++] = ' ';
  					}
  				}
  				num--, args++;
  			}
  			rule->effect[MIN(i, sizeof(rule->effect) - 1)] = '\0';
  			add_rule(rule);
  		} else if (streq("-r", *args) || streq("--remove", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "rule %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			uint16_t idx;
  			while (num > 0) {
  				if (parse_index(*args, &idx)) {
  					remove_rule_by_index(idx - 1);
  				} else if (streq("tail", *args)) {
  					remove_rule(rule_tail);
  				} else if (streq("head", *args)) {
  					remove_rule(rule_head);
  				} else {
  					remove_rule_by_cause(*args);
  				}
  				num--, args++;
  			}
  		} else if (streq("-l", *args) || streq("--list", *args)) {
  			list_rules(rsp);
  		} else {
  			fail(rsp, "rule: Unknown command: '%s'.\n", *args);
  			return;
  		}
  		num--, args++;
  	}
  }
  
  void cmd_wm(char **args, int num, FILE *rsp)
  {
  	if (num < 1) {
  		fail(rsp, "wm: Missing commands.\n");
  		return;
  	}
  
  	while (num > 0) {
  		if (streq("-d", *args) || streq("--dump-state", *args)) {
  			query_state(rsp);
  			fprintf(rsp, "\n");
  		} else if (streq("-l", *args) || streq("--load-state", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "wm %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			if (!restore_state(*args)) {
  				fail(rsp, "");
  				break;
  			}
  		} else if (streq("-a", *args) || streq("--add-monitor", *args)) {
  			num--, args++;
  			if (num < 2) {
  				fail(rsp, "wm %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			char *name = *args;
  			num--, args++;
  			xcb_rectangle_t r;
  			if (parse_rectangle(*args, &r)) {
  				monitor_t *m = make_monitor(name, &r, XCB_NONE);
  				add_monitor(m);
  				add_desktop(m, make_desktop(NULL, XCB_NONE));
  			} else {
  				fail(rsp, "wm %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				break;
  			}
  		} else if (streq("-O", *args) || streq("--reorder-monitors", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "wm %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			monitor_t *m = mon_head;
  			while (m != NULL && num > 0) {
  				monitor_t *next = m->next;
  				coordinates_t dst;
  				if (locate_monitor(*args, &dst)) {
  					swap_monitors(m, dst.monitor);
  					if (next == dst.monitor) {
  						next = m;
  					}
  				}
  				m = next;
  				num--, args++;
  			}
  		} else if (streq("-o", *args) || streq("--adopt-orphans", *args)) {
  			adopt_orphans();
  		} else if (streq("-g", *args) || streq("--get-status", *args)) {
  			print_report(rsp);
  		} else if (streq("-h", *args) || streq("--record-history", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "wm %s: Not enough arguments.\n", *(args - 1));
  				break;
  			}
  			bool b;
  			if (parse_bool(*args, &b)) {
  				record_history = b;
  			} else {
  				fail(rsp, "wm %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				break;
  			}
  		} else if (streq("-r", *args) || streq("--restart", *args)) {
  			running = false;
  			restart = true;
  			break;
  		} else {
  			fail(rsp, "wm: Unknown command: '%s'.\n", *args);
  			break;
  		}
  		num--, args++;
  	}
  }
  
  void cmd_subscribe(char **args, int num, FILE *rsp)
  {
  	int field = 0;
  	int count = -1;
  	FILE *stream = rsp;
  	char *fifo_path = NULL;
  	subscriber_mask_t mask;
  
  	while (num > 0) {
  		if (streq("-c", *args) || streq("--count", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "subscribe %s: Not enough arguments.\n", *(args - 1));
  				goto failed;
  			}
  			if (sscanf(*args, "%i", &count) != 1 || count < 1) {
  				fail(rsp, "subscribe %s: Invalid argument: '%s'.\n", *(args - 1), *args);
  				goto failed;
  			}
  		} else if (streq("-f", *args) || streq("--fifo", *args)) {
  			fifo_path = mktempfifo(FIFO_TEMPLATE);
  			if (fifo_path == NULL) {
  				fail(rsp, "subscribe %s: Can't create FIFO.\n", *(args - 1));
  				goto failed;
  			}
  		} else if (parse_subscriber_mask(*args, &mask)) {
  			field |= mask;
  		} else {
  			fail(rsp, "subscribe: Invalid argument: '%s'.\n", *args);
  			goto failed;
  		}
  		num--, args++;
  	}
  
  	if (field == 0) {
  		field = SBSC_MASK_REPORT;
  	}
  
  	if (fifo_path) {
  		fprintf(rsp, "%s\n", fifo_path);
  		fflush(rsp);
  		fclose(rsp);
  
  		stream = fopen(fifo_path, "w");
  
  		if (stream == NULL) {
  			perror("subscribe: fopen");
  			goto free_fifo_path;
  		}
  	}
  
  	subscriber_list_t *sb = make_subscriber(stream, fifo_path, field, count);
  	add_subscriber(sb);
  	return;
  
  failed:
  	fflush(rsp);
  	fclose(rsp);
  
  free_fifo_path:
  	if (fifo_path) {
  		unlink(fifo_path);
  		free(fifo_path);
  	}
  }
  
  void cmd_quit(char **args, int num, FILE *rsp)
  {
  	if (num > 0 && sscanf(*args, "%i", &exit_status) != 1) {
  		fail(rsp, "%s: Invalid argument: '%s'.\n", *(args - 1), *args);
  		return;
  	}
  	running = false;
  }
  
  void cmd_config(char **args, int num, FILE *rsp)
  {
  	if (num < 1) {
  		fail(rsp, "config: Missing arguments.\n");
  		return;
  	}
  
  	coordinates_t ref = {mon, mon->desk, mon->desk->focus};
  	coordinates_t trg = {NULL, NULL, NULL};
  
  	while (num > 0 && (*args)[0] == OPT_CHR) {
  		if (streq("-m", *args) || streq("--monitor", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "config %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			int ret;
  			if ((ret = monitor_from_desc(*args, &ref, &trg)) != SELECTOR_OK) {
  				handle_failure(ret, "config -m", *args, rsp);
  				return;
  			}
  		} else if (streq("-d", *args) || streq("--desktop", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "config %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			int ret;
  			if ((ret = desktop_from_desc(*args, &ref, &trg)) != SELECTOR_OK) {
  				handle_failure(ret, "config -d", *args, rsp);
  				return;
  			}
  		} else if (streq("-n", *args) || streq("--node", *args)) {
  			num--, args++;
  			if (num < 1) {
  				fail(rsp, "config %s: Not enough arguments.\n", *(args - 1));
  				return;
  			}
  			int ret;
  			if ((ret = node_from_desc(*args, &ref, &trg)) != SELECTOR_OK) {
  				handle_failure(ret, "config -n", *args, rsp);
  				return;
  			}
  		} else {
  			fail(rsp, "config: Unknown option: '%s'.\n", *args);
  			return;
  		}
  		num--, args++;
  	}
  	if (num == 2) {
  		set_setting(trg, *args, *(args + 1), rsp);
  	} else if (num == 1) {
  		get_setting(trg, *args, rsp);
  	} else {
  		fail(rsp, "config: Was expecting 1 or 2 arguments, received %i.\n", num);
  	}
  }
  
  void set_setting(coordinates_t loc, char *name, char *value, FILE *rsp)
  {
  	bool colors_changed = false;
  #define SET_DEF_DEFMON_DEFDESK_WIN(k, v) \
  		if (loc.node != NULL) { \
  			for (node_t *n = first_extrema(loc.node); n != NULL; n = next_leaf(n, loc.node)) { \
  				if (n->client != NULL) { \
  					n->client->k = v; \
  				} \
  			} \
  		} else if (loc.desktop != NULL) { \
  			loc.desktop->k = v; \
  			for (node_t *n = first_extrema(loc.desktop->root); n != NULL; n = next_leaf(n, loc.desktop->root)) { \
  				if (n->client != NULL) { \
  					n->client->k = v; \
  				} \
  			} \
  		} else if (loc.monitor != NULL) { \
  			loc.monitor->k = v; \
  			for (desktop_t *d = loc.monitor->desk_head; d != NULL; d = d->next) { \
  				d->k = v; \
  				for (node_t *n = first_extrema(d->root); n != NULL; n = next_leaf(n, d->root)) { \
  					if (n->client != NULL) { \
  						n->client->k = v; \
  					} \
  				} \
  			} \
  		} else { \
  			k = v; \
  			for (monitor_t *m = mon_head; m != NULL; m = m->next) { \
  				m->k = v; \
  				for (desktop_t *d = m->desk_head; d != NULL; d = d->next) { \
  					d->k = v; \
  					for (node_t *n = first_extrema(d->root); n != NULL; n = next_leaf(n, d->root)) { \
  						if (n->client != NULL) { \
  							n->client->k = v; \
  						} \
  					} \
  				} \
  			} \
  		}
  	if (streq("border_width", name)) {
  		unsigned int bw;
  		if (sscanf(value, "%u", &bw) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  		SET_DEF_DEFMON_DEFDESK_WIN(border_width, bw)
  	} else if (streq("border_radius", name)) {
  		unsigned int br;
  		if (sscanf(value, "%u", &br) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  		SET_DEF_DEFMON_DEFDESK_WIN(border_radius, br)
  #undef SET_DEF_DEFMON_DEFDESK_WIN
  #define SET_DEF_DEFMON_DESK(k, v) \
  		if (loc.desktop != NULL) { \
  			loc.desktop->k = v; \
  		} else if (loc.monitor != NULL) { \
  			loc.monitor->k = v; \
  			for (desktop_t *d = loc.monitor->desk_head; d != NULL; d = d->next) { \
  				d->k = v; \
  			} \
  		} else { \
  			k = v; \
  			for (monitor_t *m = mon_head; m != NULL; m = m->next) { \
  				m->k = v; \
  				for (desktop_t *d = m->desk_head; d != NULL; d = d->next) { \
  					d->k = v; \
  				} \
  			} \
  		}
  	} else if (streq("window_gap", name)) {
  		int wg;
  		if (sscanf(value, "%i", &wg) != 1) {
  			fail(rsp, "");
  			return;
  		}
  		SET_DEF_DEFMON_DESK(window_gap, wg)
  #undef SET_DEF_DEFMON_DESK
  #define SET_DEF_MON_DESK(k, v) \
  		if (loc.desktop != NULL) { \
  			loc.desktop->k = v; \
  		} else if (loc.monitor != NULL) { \
  			loc.monitor->k = v; \
  		} else { \
  			k = v; \
  			for (monitor_t *m = mon_head; m != NULL; m = m->next) { \
  				m->k = v; \
  			} \
  		}
  	} else if (streq("top_padding", name)) {
  		int tp;
  		if (sscanf(value, "%i", &tp) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  		SET_DEF_MON_DESK(padding.top, tp)
  	} else if (streq("right_padding", name)) {
  		int rp;
  		if (sscanf(value, "%i", &rp) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  		SET_DEF_MON_DESK(padding.right, rp)
  	} else if (streq("bottom_padding", name)) {
  		int bp;
  		if (sscanf(value, "%i", &bp) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  		SET_DEF_MON_DESK(padding.bottom, bp)
  	} else if (streq("left_padding", name)) {
  		int lp;
  		if (sscanf(value, "%i", &lp) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  		SET_DEF_MON_DESK(padding.left, lp)
  #undef SET_DEF_MON_DESK
  	} else if (streq("top_monocle_padding", name)) {
  		if (sscanf(value, "%i", &monocle_padding.top) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  		}
  	} else if (streq("right_monocle_padding", name)) {
  		if (sscanf(value, "%i", &monocle_padding.right) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  		}
  	} else if (streq("bottom_monocle_padding", name)) {
  		if (sscanf(value, "%i", &monocle_padding.bottom) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  		}
  	} else if (streq("left_monocle_padding", name)) {
  		if (sscanf(value, "%i", &monocle_padding.left) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  		}
  #define SET_STR(s) \
  	} else if (streq(#s, name)) { \
  		if (snprintf(s, sizeof(s), "%s", value) < 0) { \
  			fail(rsp, ""); \
  			return; \
  		}
  	SET_STR(external_rules_command)
  	SET_STR(status_prefix)
  #undef SET_STR
  	} else if (streq("split_ratio", name)) {
  		double r;
  		if (sscanf(value, "%lf", &r) == 1 && r > 0 && r < 1) {
  			split_ratio = r;
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value); \
  			return;
  		}
  		return;
  #define SET_COLOR(s) \
  	} else if (streq(#s, name)) { \
  		if (!is_hex_color(value)) { \
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value); \
  			return; \
  		} else { \
  			snprintf(s, sizeof(s), "%s", value); \
  			colors_changed = true; \
  		}
  	SET_COLOR(normal_border_color)
  	SET_COLOR(active_border_color)
  	SET_COLOR(focused_border_color)
  	SET_COLOR(presel_feedback_color)
  #undef SET_COLOR
  	} else if (streq("initial_polarity", name)) {
  		child_polarity_t p;
  		if (parse_child_polarity(value, &p)) {
  			initial_polarity = p;
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("automatic_scheme", name)) {
  		automatic_scheme_t a;
  		if (parse_automatic_scheme(value, &a)) {
  			automatic_scheme = a;
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("mapping_events_count", name)) {
  		if (sscanf(value, "%" SCNi8, &mapping_events_count) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("directional_focus_tightness", name)) {
  		tightness_t p;
  		if (parse_tightness(value, &p)) {
  			directional_focus_tightness = p;
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("ignore_ewmh_fullscreen", name)) {
  		state_transition_t m;
  		if (parse_state_transition(value, &m)) {
  			ignore_ewmh_fullscreen = m;
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("pointer_modifier", name)) {
  		if (parse_modifier_mask(value, &pointer_modifier)) {
  			ungrab_buttons();
  			grab_buttons();
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("pointer_motion_interval", name)) {
  		if (sscanf(value, "%u", &pointer_motion_interval) != 1) {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("pointer_action1", name) ||
  	           streq("pointer_action2", name) ||
  	           streq("pointer_action3", name)) {
  		int index = name[14] - '1';
  		if (parse_pointer_action(value, &pointer_actions[index])) {
  			ungrab_buttons();
  			grab_buttons();
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("click_to_focus", name)) {
  		if (parse_button_index(value, &click_to_focus)) {
  			ungrab_buttons();
  			grab_buttons();
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("single_monocle", name)) {
  		bool b;
  		if (parse_bool(value, &b)) {
  			if (b == single_monocle) {
  				fail(rsp, "");
  				return;
  			}
  			single_monocle = b;
  			for (monitor_t *m = mon_head; m != NULL; m = m->next) {
  				for (desktop_t *d = m->desk_head; d != NULL; d = d->next) {
  					layout_t l = (single_monocle && tiled_count(d->root, true) <= 1) ? LAYOUT_MONOCLE : d->user_layout;
  					set_layout(m, d, l, false);
  				}
  			}
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  	} else if (streq("focus_follows_pointer", name)) {
  		bool b;
  		if (parse_bool(value, &b)) {
  			if (b == focus_follows_pointer) {
  				fail(rsp, "");
  				return;
  			}
  			focus_follows_pointer = b;
  			for (monitor_t *m = mon_head; m != NULL; m = m->next) {
  				if (focus_follows_pointer) {
  					window_show(m->root);
  				} else {
  					window_hide(m->root);
  				}
  				for (desktop_t *d = m->desk_head; d != NULL; d = d->next) {
  					listen_enter_notify(d->root, focus_follows_pointer);
  				}
  			}
  			if (focus_follows_pointer) {
  				update_motion_recorder();
  			} else {
  				disable_motion_recorder();
  			}
  			return;
  		} else {
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value);
  			return;
  		}
  #define SET_BOOL(s) \
  	} else if (streq(#s, name)) { \
  		if (!parse_bool(value, &s)) { \
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value); \
  			return; \
  		}
  		SET_BOOL(presel_feedback)
  		SET_BOOL(borderless_monocle)
  		SET_BOOL(gapless_monocle)
  		SET_BOOL(borderless_singleton)
  		SET_BOOL(swallow_first_click)
  		SET_BOOL(pointer_follows_focus)
  		SET_BOOL(pointer_follows_monitor)
  		SET_BOOL(ignore_ewmh_focus)
  		SET_BOOL(ignore_ewmh_struts)
  		SET_BOOL(center_pseudo_tiled)
  		SET_BOOL(honor_size_hints)
  		SET_BOOL(removal_adjustment)
  #undef SET_BOOL
  #define SET_MON_BOOL(s) \
  	} else if (streq(#s, name)) { \
  		if (!parse_bool(value, &s)) { \
  			fail(rsp, "config: %s: Invalid value: '%s'.\n", name, value); \
  			return; \
  		} \
  		if (s) { \
  			update_monitors(); \
  		}
  		SET_MON_BOOL(remove_disabled_monitors)
  		SET_MON_BOOL(remove_unplugged_monitors)
  		SET_MON_BOOL(merge_overlapping_monitors)
  #undef SET_MON_BOOL
  	} else {
  		fail(rsp, "config: Unknown setting: '%s'.\n", name);
  		return;
  	}
  
  	for (monitor_t *m = mon_head; m != NULL; m = m->next) {
  		for (desktop_t *d = m->desk_head; d != NULL; d = d->next) {
  			arrange(m, d);
  			if (colors_changed) {
  				update_colors_in(d->root, d, m);
  			}
  		}
  	}
  }
  
  void get_setting(coordinates_t loc, char *name, FILE* rsp)
  {
  	if (streq("split_ratio", name)) {
  		fprintf(rsp, "%lf", split_ratio);
  	} else if (streq("border_width", name)) {
  		if (loc.node != NULL) {
  			for (node_t *n = first_extrema(loc.node); n != NULL; n = next_leaf(n, loc.node)) {
  				if (n->client != NULL) {
  					fprintf(rsp, "%u", n->client->border_width);
  					break;
  				}
  			}
  		} else if (loc.desktop != NULL) {
  			fprintf(rsp, "%u", loc.desktop->border_width);
  		} else if (loc.monitor != NULL) {
  			fprintf(rsp, "%u", loc.monitor->border_width);
  		} else {
  			fprintf(rsp, "%u", border_width);
  		}
  	} else if (streq("border_radius", name)) {
  		if (loc.node != NULL) {
  			for (node_t *n = first_extrema(loc.node); n != NULL; n = next_leaf(n, loc.node)) {
  				if (n->client != NULL) {
  					fprintf(rsp, "%u", n->client->border_radius);
  					break;
  				}
  			}
  		} else if (loc.desktop != NULL) {
  			fprintf(rsp, "%u", loc.desktop->border_radius);
  		} else if (loc.monitor != NULL) {
  			fprintf(rsp, "%u", loc.monitor->border_radius);
  		} else {
  			fprintf(rsp, "%u", border_radius);
  		}
  	} else if (streq("window_gap", name)) {
  		if (loc.desktop != NULL) {
  			fprintf(rsp, "%i", loc.desktop->window_gap);
  		} else if (loc.monitor != NULL) {
  			fprintf(rsp, "%i", loc.monitor->window_gap);
  		} else {
  			fprintf(rsp, "%i", window_gap);
  		}
  #define GET_DEF_MON_DESK(k) \
  		if (loc.desktop != NULL) { \
  			fprintf(rsp, "%i", loc.desktop->k); \
  		} else if (loc.monitor != NULL) { \
  			fprintf(rsp, "%i", loc.monitor->k); \
  		} else { \
  			fprintf(rsp, "%i", k); \
  		}
  	} else if (streq("top_padding", name)) {
  		GET_DEF_MON_DESK(padding.top)
  	} else if (streq("right_padding", name)) {
  		GET_DEF_MON_DESK(padding.right)
  	} else if (streq("bottom_padding", name)) {
  		GET_DEF_MON_DESK(padding.bottom)
  	} else if (streq("left_padding", name)) {
  		GET_DEF_MON_DESK(padding.left)
  #undef GET_DEF_MON_DESK
  	} else if (streq("top_monocle_padding", name)) {
  		fprintf(rsp, "%i", monocle_padding.top);
  	} else if (streq("right_monocle_padding", name)) {
  		fprintf(rsp, "%i", monocle_padding.right);
  	} else if (streq("bottom_monocle_padding", name)) {
  		fprintf(rsp, "%i", monocle_padding.bottom);
  	} else if (streq("left_monocle_padding", name)) {
  		fprintf(rsp, "%i", monocle_padding.left);
  	} else if (streq("external_rules_command", name)) {
  		fprintf(rsp, "%s", external_rules_command);
  	} else if (streq("status_prefix", name)) {
  		fprintf(rsp, "%s", status_prefix);
  	} else if (streq("initial_polarity", name)) {
  		fprintf(rsp, "%s", CHILD_POL_STR(initial_polarity));
  	} else if (streq("automatic_scheme", name)) {
  		fprintf(rsp, "%s", AUTO_SCM_STR(automatic_scheme));
  	} else if (streq("mapping_events_count", name)) {
  		fprintf(rsp, "%" PRIi8, mapping_events_count);
  	} else if (streq("directional_focus_tightness", name)) {
  		fprintf(rsp, "%s", TIGHTNESS_STR(directional_focus_tightness));
  	} else if (streq("ignore_ewmh_fullscreen", name)) {
  		print_ignore_request(ignore_ewmh_fullscreen, rsp);
  	} else if (streq("pointer_modifier", name)) {
  		print_modifier_mask(pointer_modifier, rsp);
  	} else if (streq("click_to_focus", name)) {
  		print_button_index(click_to_focus, rsp);
  	} else if (streq("pointer_motion_interval", name)) {
  		fprintf(rsp, "%u", pointer_motion_interval);
  	} else if (streq("pointer_action1", name) ||
  	           streq("pointer_action2", name) ||
  	           streq("pointer_action3", name)) {
  		int index = name[14] - '1';
  		print_pointer_action(pointer_actions[index], rsp);
  #define GET_COLOR(s) \
  	} else if (streq(#s, name)) { \
  		fprintf(rsp, "%s", s);
  	GET_COLOR(normal_border_color)
  	GET_COLOR(active_border_color)
  	GET_COLOR(focused_border_color)
  	GET_COLOR(presel_feedback_color)
  #undef GET_COLOR
  #define GET_BOOL(s) \
  	} else if (streq(#s, name)) { \
  		fprintf(rsp, "%s", BOOL_STR(s));
  	GET_BOOL(presel_feedback)
  	GET_BOOL(borderless_monocle)
  	GET_BOOL(gapless_monocle)
  	GET_BOOL(single_monocle)
  	GET_BOOL(borderless_singleton)
  	GET_BOOL(swallow_first_click)
  	GET_BOOL(focus_follows_pointer)
  	GET_BOOL(pointer_follows_focus)
  	GET_BOOL(pointer_follows_monitor)
  	GET_BOOL(ignore_ewmh_focus)
  	GET_BOOL(ignore_ewmh_struts)
  	GET_BOOL(center_pseudo_tiled)
  	GET_BOOL(honor_size_hints)
  	GET_BOOL(removal_adjustment)
  	GET_BOOL(remove_disabled_monitors)
  	GET_BOOL(remove_unplugged_monitors)
  	GET_BOOL(merge_overlapping_monitors)
  #undef GET_BOOL
  	} else {
  		fail(rsp, "config: Unknown setting: '%s'.\n", name);
  		return;
  	}
  	fprintf(rsp, "\n");
  }
  
  void handle_failure(int code, char *src, char *val, FILE *rsp)
  {
  	switch (code) {
  		case SELECTOR_BAD_DESCRIPTOR:
  			fail(rsp, "%s: Invalid descriptor found in '%s'.\n", src, val);
  			break;
  		case SELECTOR_BAD_MODIFIERS:
  			fail(rsp, "%s: Invalid modifier found in '%s'.\n", src, val);
  			break;
  		case SELECTOR_INVALID:
  			fail(rsp, "");
  			break;
  	}
  }
  
  void fail(FILE *rsp, char *fmt, ...)
  {
  	fprintf(rsp, FAILURE_MESSAGE);
  	va_list ap;
  	va_start(ap, fmt);
  	vfprintf(rsp, fmt, ap);
  	va_end(ap);
  }
  