sway/sway/config.c

870 lines
24 KiB
C

#define _XOPEN_SOURCE 600 // for realpath
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <libgen.h>
#include <wordexp.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <signal.h>
#include <libinput.h>
#include <limits.h>
#include <dirent.h>
#include <strings.h>
#ifdef __linux__
#include <linux/input-event-codes.h>
#elif __FreeBSD__
#include <dev/evdev/input-event-codes.h>
#endif
#include <wlr/types/wlr_output.h>
#include "sway/input/input-manager.h"
#include "sway/input/seat.h"
#include "sway/commands.h"
#include "sway/config.h"
#include "sway/criteria.h"
#include "sway/swaynag.h"
#include "sway/tree/arrange.h"
#include "sway/tree/root.h"
#include "sway/tree/workspace.h"
#include "cairo.h"
#include "pango.h"
#include "readline.h"
#include "stringop.h"
#include "list.h"
#include "log.h"
struct sway_config *config = NULL;
static void free_mode(struct sway_mode *mode) {
if (!mode) {
return;
}
free(mode->name);
if (mode->keysym_bindings) {
for (int i = 0; i < mode->keysym_bindings->length; i++) {
free_sway_binding(mode->keysym_bindings->items[i]);
}
list_free(mode->keysym_bindings);
}
if (mode->keycode_bindings) {
for (int i = 0; i < mode->keycode_bindings->length; i++) {
free_sway_binding(mode->keycode_bindings->items[i]);
}
list_free(mode->keycode_bindings);
}
if (mode->mouse_bindings) {
for (int i = 0; i < mode->mouse_bindings->length; i++) {
free_sway_binding(mode->mouse_bindings->items[i]);
}
list_free(mode->mouse_bindings);
}
free(mode);
}
void free_config(struct sway_config *config) {
if (!config) {
return;
}
memset(&config->handler_context, 0, sizeof(config->handler_context));
// TODO: handle all currently unhandled lists as we add implementations
if (config->symbols) {
for (int i = 0; i < config->symbols->length; ++i) {
free_sway_variable(config->symbols->items[i]);
}
list_free(config->symbols);
}
if (config->modes) {
for (int i = 0; i < config->modes->length; ++i) {
free_mode(config->modes->items[i]);
}
list_free(config->modes);
}
if (config->bars) {
for (int i = 0; i < config->bars->length; ++i) {
free_bar_config(config->bars->items[i]);
}
list_free(config->bars);
}
list_free(config->cmd_queue);
if (config->workspace_configs) {
for (int i = 0; i < config->workspace_configs->length; i++) {
free_workspace_config(config->workspace_configs->items[i]);
}
list_free(config->workspace_configs);
}
if (config->output_configs) {
for (int i = 0; i < config->output_configs->length; i++) {
free_output_config(config->output_configs->items[i]);
}
list_free(config->output_configs);
}
if (config->input_configs) {
for (int i = 0; i < config->input_configs->length; i++) {
free_input_config(config->input_configs->items[i]);
}
list_free(config->input_configs);
}
if (config->seat_configs) {
for (int i = 0; i < config->seat_configs->length; i++) {
free_seat_config(config->seat_configs->items[i]);
}
list_free(config->seat_configs);
}
if (config->criteria) {
for (int i = 0; i < config->criteria->length; ++i) {
criteria_destroy(config->criteria->items[i]);
}
list_free(config->criteria);
}
list_free(config->no_focus);
list_free(config->active_bar_modifiers);
list_free(config->config_chain);
list_free(config->command_policies);
list_free(config->feature_policies);
list_free(config->ipc_policies);
free(config->floating_scroll_up_cmd);
free(config->floating_scroll_down_cmd);
free(config->floating_scroll_left_cmd);
free(config->floating_scroll_right_cmd);
free(config->font);
free(config->swaybg_command);
free(config->swaynag_command);
free((char *)config->current_config_path);
free((char *)config->current_config);
free(config);
}
static void destroy_removed_seats(struct sway_config *old_config,
struct sway_config *new_config) {
struct seat_config *seat_config;
struct sway_seat *seat;
int i;
for (i = 0; i < old_config->seat_configs->length; i++) {
seat_config = old_config->seat_configs->items[i];
/* Also destroy seats that aren't present in new config */
if (new_config && list_seq_find(new_config->seat_configs,
seat_name_cmp, seat_config->name) < 0) {
seat = input_manager_get_seat(seat_config->name);
seat_destroy(seat);
}
}
}
static void set_color(float dest[static 4], uint32_t color) {
dest[0] = ((color >> 16) & 0xff) / 255.0;
dest[1] = ((color >> 8) & 0xff) / 255.0;
dest[2] = (color & 0xff) / 255.0;
dest[3] = 1.0;
}
static void config_defaults(struct sway_config *config) {
if (!(config->swaynag_command = strdup("swaynag"))) goto cleanup;
config->swaynag_config_errors = (struct swaynag_instance){
.args = "--type error "
"--message 'There are errors in your config file' "
"--detailed-message "
"--button 'Exit sway' 'swaymsg exit' "
"--button 'Reload sway' 'swaymsg reload'",
.pid = -1,
.detailed = true,
};
if (!(config->symbols = create_list())) goto cleanup;
if (!(config->modes = create_list())) goto cleanup;
if (!(config->bars = create_list())) goto cleanup;
if (!(config->workspace_configs = create_list())) goto cleanup;
if (!(config->criteria = create_list())) goto cleanup;
if (!(config->no_focus = create_list())) goto cleanup;
if (!(config->input_configs = create_list())) goto cleanup;
if (!(config->seat_configs = create_list())) goto cleanup;
if (!(config->output_configs = create_list())) goto cleanup;
if (!(config->cmd_queue = create_list())) goto cleanup;
if (!(config->current_mode = malloc(sizeof(struct sway_mode))))
goto cleanup;
if (!(config->current_mode->name = malloc(sizeof("default")))) goto cleanup;
strcpy(config->current_mode->name, "default");
if (!(config->current_mode->keysym_bindings = create_list())) goto cleanup;
if (!(config->current_mode->keycode_bindings = create_list())) goto cleanup;
if (!(config->current_mode->mouse_bindings = create_list())) goto cleanup;
list_add(config->modes, config->current_mode);
config->floating_mod = 0;
config->floating_mod_inverse = false;
config->dragging_key = BTN_LEFT;
config->resizing_key = BTN_RIGHT;
if (!(config->floating_scroll_up_cmd = strdup(""))) goto cleanup;
if (!(config->floating_scroll_down_cmd = strdup(""))) goto cleanup;
if (!(config->floating_scroll_left_cmd = strdup(""))) goto cleanup;
if (!(config->floating_scroll_right_cmd = strdup(""))) goto cleanup;
config->default_layout = L_NONE;
config->default_orientation = L_NONE;
if (!(config->font = strdup("monospace 10"))) goto cleanup;
config->font_height = 17; // height of monospace 10
config->urgent_timeout = 500;
config->popup_during_fullscreen = POPUP_SMART;
config->titlebar_border_thickness = 1;
config->titlebar_h_padding = 5;
config->titlebar_v_padding = 4;
// floating view
config->floating_maximum_width = 0;
config->floating_maximum_height = 0;
config->floating_minimum_width = 75;
config->floating_minimum_height = 50;
// Flags
config->focus_follows_mouse = FOLLOWS_YES;
config->mouse_warping = WARP_OUTPUT;
config->focus_wrapping = WRAP_YES;
config->validating = false;
config->reloading = false;
config->active = false;
config->failed = false;
config->auto_back_and_forth = false;
config->reading = false;
config->show_marks = true;
config->title_align = ALIGN_LEFT;
config->tiling_drag = true;
config->smart_gaps = false;
config->gaps_inner = 0;
config->gaps_outer.top = 0;
config->gaps_outer.right = 0;
config->gaps_outer.bottom = 0;
config->gaps_outer.left = 0;
if (!(config->active_bar_modifiers = create_list())) goto cleanup;
if (!(config->swaybg_command = strdup("swaybg"))) goto cleanup;
if (!(config->config_chain = create_list())) goto cleanup;
config->current_config_path = NULL;
config->current_config = NULL;
// borders
config->border = B_NORMAL;
config->floating_border = B_NORMAL;
config->border_thickness = 2;
config->floating_border_thickness = 2;
config->hide_edge_borders = E_NONE;
config->saved_edge_borders = E_NONE;
// border colors
set_color(config->border_colors.focused.border, 0x4C7899);
set_color(config->border_colors.focused.background, 0x285577);
set_color(config->border_colors.focused.text, 0xFFFFFFFF);
set_color(config->border_colors.focused.indicator, 0x2E9EF4);
set_color(config->border_colors.focused.child_border, 0x285577);
set_color(config->border_colors.focused_inactive.border, 0x333333);
set_color(config->border_colors.focused_inactive.background, 0x5F676A);
set_color(config->border_colors.focused_inactive.text, 0xFFFFFFFF);
set_color(config->border_colors.focused_inactive.indicator, 0x484E50);
set_color(config->border_colors.focused_inactive.child_border, 0x5F676A);
set_color(config->border_colors.unfocused.border, 0x333333);
set_color(config->border_colors.unfocused.background, 0x222222);
set_color(config->border_colors.unfocused.text, 0x88888888);
set_color(config->border_colors.unfocused.indicator, 0x292D2E);
set_color(config->border_colors.unfocused.child_border, 0x222222);
set_color(config->border_colors.urgent.border, 0x2F343A);
set_color(config->border_colors.urgent.background, 0x900000);
set_color(config->border_colors.urgent.text, 0xFFFFFFFF);
set_color(config->border_colors.urgent.indicator, 0x900000);
set_color(config->border_colors.urgent.child_border, 0x900000);
set_color(config->border_colors.placeholder.border, 0x000000);
set_color(config->border_colors.placeholder.background, 0x0C0C0C);
set_color(config->border_colors.placeholder.text, 0xFFFFFFFF);
set_color(config->border_colors.placeholder.indicator, 0x000000);
set_color(config->border_colors.placeholder.child_border, 0x0C0C0C);
set_color(config->border_colors.background, 0xFFFFFF);
// Security
if (!(config->command_policies = create_list())) goto cleanup;
if (!(config->feature_policies = create_list())) goto cleanup;
if (!(config->ipc_policies = create_list())) goto cleanup;
return;
cleanup:
sway_abort("Unable to allocate config structures");
}
static bool file_exists(const char *path) {
return path && access(path, R_OK) != -1;
}
static char *get_config_path(void) {
static const char *config_paths[] = {
"$HOME/.sway/config",
"$XDG_CONFIG_HOME/sway/config",
"$HOME/.i3/config",
"$XDG_CONFIG_HOME/i3/config",
SYSCONFDIR "/sway/config",
SYSCONFDIR "/i3/config",
};
char *config_home = getenv("XDG_CONFIG_HOME");
if (!config_home || !*config_home) {
config_paths[1] = "$HOME/.config/sway/config";
config_paths[3] = "$HOME/.config/i3/config";
}
for (size_t i = 0; i < sizeof(config_paths) / sizeof(char *); ++i) {
wordexp_t p;
if (wordexp(config_paths[i], &p, WRDE_UNDEF) == 0) {
char *path = strdup(p.we_wordv[0]);
wordfree(&p);
if (file_exists(path)) {
return path;
}
free(path);
}
}
return NULL;
}
static bool load_config(const char *path, struct sway_config *config,
struct swaynag_instance *swaynag) {
if (path == NULL) {
wlr_log(WLR_ERROR, "Unable to find a config file!");
return false;
}
wlr_log(WLR_INFO, "Loading config from %s", path);
struct stat sb;
if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
return false;
}
FILE *f = fopen(path, "r");
if (!f) {
wlr_log(WLR_ERROR, "Unable to open %s for reading", path);
return false;
}
bool config_load_success = read_config(f, config, swaynag);
fclose(f);
if (!config_load_success) {
wlr_log(WLR_ERROR, "Error(s) loading config!");
}
return true;
}
bool load_main_config(const char *file, bool is_active, bool validating) {
char *path;
if (file != NULL) {
path = strdup(file);
} else {
path = get_config_path();
}
struct sway_config *old_config = config;
config = calloc(1, sizeof(struct sway_config));
if (!config) {
sway_abort("Unable to allocate config");
}
config_defaults(config);
config->validating = validating;
if (is_active) {
wlr_log(WLR_DEBUG, "Performing configuration file %s",
validating ? "validation" : "reload");
config->reloading = true;
config->active = true;
swaynag_kill(&old_config->swaynag_config_errors);
memcpy(&config->swaynag_config_errors,
&old_config->swaynag_config_errors,
sizeof(struct swaynag_instance));
create_default_output_configs();
}
config->current_config_path = path;
list_add(config->config_chain, path);
config->reading = true;
// Read security configs
// TODO: Security
bool success = true;
/*
DIR *dir = opendir(SYSCONFDIR "/sway/security.d");
if (!dir) {
wlr_log(WLR_ERROR,
"%s does not exist, sway will have no security configuration"
" and will probably be broken", SYSCONFDIR "/sway/security.d");
} else {
list_t *secconfigs = create_list();
char *base = SYSCONFDIR "/sway/security.d/";
struct dirent *ent = readdir(dir);
struct stat s;
while (ent != NULL) {
char *_path = malloc(strlen(ent->d_name) + strlen(base) + 1);
strcpy(_path, base);
strcat(_path, ent->d_name);
lstat(_path, &s);
if (S_ISREG(s.st_mode) && ent->d_name[0] != '.') {
list_add(secconfigs, _path);
}
else {
free(_path);
}
ent = readdir(dir);
}
closedir(dir);
list_qsort(secconfigs, qstrcmp);
for (int i = 0; i < secconfigs->length; ++i) {
char *_path = secconfigs->items[i];
if (stat(_path, &s) || s.st_uid != 0 || s.st_gid != 0 ||
(((s.st_mode & 0777) != 0644) &&
(s.st_mode & 0777) != 0444)) {
wlr_log(WLR_ERROR,
"Refusing to load %s - it must be owned by root "
"and mode 644 or 444", _path);
success = false;
} else {
success = success && load_config(_path, config);
}
}
list_free_items_and_destroy(secconfigs);
}
*/
success = success && load_config(path, config,
&config->swaynag_config_errors);
if (validating) {
free_config(config);
config = old_config;
return success;
}
if (is_active) {
for (int i = 0; i < config->output_configs->length; i++) {
apply_output_config_to_outputs(config->output_configs->items[i]);
}
config->reloading = false;
if (config->swaynag_config_errors.pid > 0) {
swaynag_show(&config->swaynag_config_errors);
}
}
if (old_config) {
destroy_removed_seats(old_config, config);
free_config(old_config);
}
config->reading = false;
return success;
}
static bool load_include_config(const char *path, const char *parent_dir,
struct sway_config *config, struct swaynag_instance *swaynag) {
// save parent config
const char *parent_config = config->current_config_path;
char *full_path;
int len = strlen(path);
if (len >= 1 && path[0] != '/') {
len = len + strlen(parent_dir) + 2;
full_path = malloc(len * sizeof(char));
if (!full_path) {
wlr_log(WLR_ERROR,
"Unable to allocate full path to included config");
return false;
}
snprintf(full_path, len, "%s/%s", parent_dir, path);
} else {
full_path = strdup(path);
}
char *real_path = realpath(full_path, NULL);
free(full_path);
if (real_path == NULL) {
wlr_log(WLR_DEBUG, "%s not found.", path);
return false;
}
// check if config has already been included
int j;
for (j = 0; j < config->config_chain->length; ++j) {
char *old_path = config->config_chain->items[j];
if (strcmp(real_path, old_path) == 0) {
wlr_log(WLR_DEBUG,
"%s already included once, won't be included again.",
real_path);
free(real_path);
return false;
}
}
config->current_config_path = real_path;
list_add(config->config_chain, real_path);
int index = config->config_chain->length - 1;
if (!load_config(real_path, config, swaynag)) {
free(real_path);
config->current_config_path = parent_config;
list_del(config->config_chain, index);
return false;
}
// restore current_config_path
config->current_config_path = parent_config;
return true;
}
bool load_include_configs(const char *path, struct sway_config *config,
struct swaynag_instance *swaynag) {
char *wd = getcwd(NULL, 0);
char *parent_path = strdup(config->current_config_path);
const char *parent_dir = dirname(parent_path);
if (chdir(parent_dir) < 0) {
free(parent_path);
free(wd);
return false;
}
wordexp_t p;
if (wordexp(path, &p, 0) < 0) {
free(parent_path);
free(wd);
return false;
}
char **w = p.we_wordv;
size_t i;
for (i = 0; i < p.we_wordc; ++i) {
load_include_config(w[i], parent_dir, config, swaynag);
}
free(parent_path);
wordfree(&p);
// restore wd
if (chdir(wd) < 0) {
free(wd);
wlr_log(WLR_ERROR, "failed to restore working directory");
return false;
}
free(wd);
return true;
}
static int detect_brace_on_following_line(FILE *file, char *line,
int line_number) {
int lines = 0;
if (line[strlen(line) - 1] != '{' && line[strlen(line) - 1] != '}') {
char *peeked = NULL;
long position = 0;
do {
free(peeked);
peeked = peek_line(file, lines, &position);
if (peeked) {
peeked = strip_whitespace(peeked);
}
lines++;
} while (peeked && strlen(peeked) == 0);
if (peeked && strlen(peeked) == 1 && peeked[0] == '{') {
fseek(file, position, SEEK_SET);
} else {
lines = 0;
}
free(peeked);
}
return lines;
}
static char *expand_line(const char *block, const char *line, bool add_brace) {
int size = (block ? strlen(block) + 1 : 0) + strlen(line)
+ (add_brace ? 2 : 0) + 1;
char *expanded = calloc(1, size);
if (!expanded) {
wlr_log(WLR_ERROR, "Cannot allocate expanded line buffer");
return NULL;
}
snprintf(expanded, size, "%s%s%s%s", block ? block : "",
block ? " " : "", line, add_brace ? " {" : "");
return expanded;
}
bool read_config(FILE *file, struct sway_config *config,
struct swaynag_instance *swaynag) {
bool reading_main_config = false;
char *this_config = NULL;
size_t config_size = 0;
if (config->current_config == NULL) {
reading_main_config = true;
int ret_seek = fseek(file, 0, SEEK_END);
long ret_tell = ftell(file);
if (ret_seek == -1 || ret_tell == -1) {
wlr_log(WLR_ERROR, "Unable to get size of config file");
return false;
}
config_size = ret_tell;
rewind(file);
config->current_config = this_config = calloc(1, config_size + 1);
if (this_config == NULL) {
wlr_log(WLR_ERROR, "Unable to allocate buffer for config contents");
return false;
}
}
bool success = true;
int line_number = 0;
char *line;
list_t *stack = create_list();
size_t read = 0;
while (!feof(file)) {
char *block = stack->length ? stack->items[0] : NULL;
line = read_line(file);
if (!line) {
continue;
}
line_number++;
wlr_log(WLR_DEBUG, "Read line %d: %s", line_number, line);
if (reading_main_config) {
size_t length = strlen(line);
if (read + length > config_size) {
wlr_log(WLR_ERROR, "Config file changed during reading");
list_free_items_and_destroy(stack);
free(line);
return false;
}
strcpy(this_config + read, line);
if (line_number != 1) {
this_config[read - 1] = '\n';
}
read += length + 1;
}
line = strip_whitespace(line);
if (line[0] == '#') {
free(line);
continue;
}
if (strlen(line) == 0) {
free(line);
continue;
}
int brace_detected = detect_brace_on_following_line(file, line,
line_number);
if (brace_detected > 0) {
line_number += brace_detected;
wlr_log(WLR_DEBUG, "Detected open brace on line %d", line_number);
}
char *expanded = expand_line(block, line, brace_detected > 0);
if (!expanded) {
list_free_items_and_destroy(stack);
free(line);
return false;
}
config->current_config_line_number = line_number;
config->current_config_line = line;
struct cmd_results *res;
if (block && strcmp(block, "<commands>") == 0) {
// Special case
res = config_commands_command(expanded);
} else {
res = config_command(expanded);
}
switch(res->status) {
case CMD_FAILURE:
case CMD_INVALID:
wlr_log(WLR_ERROR, "Error on line %i '%s': %s (%s)", line_number,
line, res->error, config->current_config_path);
if (!config->validating) {
swaynag_log(config->swaynag_command, swaynag,
"Error on line %i (%s) '%s': %s", line_number,
config->current_config_path, line, res->error);
}
success = false;
break;
case CMD_DEFER:
wlr_log(WLR_DEBUG, "Deferring command `%s'", line);
list_add(config->cmd_queue, strdup(expanded));
break;
case CMD_BLOCK_COMMANDS:
wlr_log(WLR_DEBUG, "Entering commands block");
list_insert(stack, 0, "<commands>");
break;
case CMD_BLOCK:
wlr_log(WLR_DEBUG, "Entering block '%s'", res->input);
list_insert(stack, 0, strdup(res->input));
if (strcmp(res->input, "bar") == 0) {
config->current_bar = NULL;
}
break;
case CMD_BLOCK_END:
if (!block) {
wlr_log(WLR_DEBUG, "Unmatched '}' on line %i", line_number);
success = false;
break;
}
if (strcmp(block, "bar") == 0) {
config->current_bar = NULL;
}
wlr_log(WLR_DEBUG, "Exiting block '%s'", block);
list_del(stack, 0);
free(block);
memset(&config->handler_context, 0,
sizeof(config->handler_context));
default:;
}
free(expanded);
free(line);
free_cmd_results(res);
}
list_free_items_and_destroy(stack);
config->current_config_line_number = 0;
config->current_config_line = NULL;
return success;
}
void config_add_swaynag_warning(char *fmt, ...) {
if (config->reading && !config->validating) {
va_list args;
va_start(args, fmt);
size_t length = vsnprintf(NULL, 0, fmt, args) + 1;
va_end(args);
char *temp = malloc(length + 1);
if (!temp) {
wlr_log(WLR_ERROR, "Failed to allocate buffer for warning.");
return;
}
va_start(args, fmt);
vsnprintf(temp, length, fmt, args);
va_end(args);
swaynag_log(config->swaynag_command, &config->swaynag_config_errors,
"Warning on line %i (%s) '%s': %s",
config->current_config_line_number, config->current_config_path,
config->current_config_line, temp);
}
}
char *do_var_replacement(char *str) {
int i;
char *find = str;
while ((find = strchr(find, '$'))) {
// Skip if escaped.
if (find > str && find[-1] == '\\') {
if (find == str + 1 || !(find > str + 1 && find[-2] == '\\')) {
++find;
continue;
}
}
// Unescape double $ and move on
if (find[1] == '$') {
size_t length = strlen(find + 1);
memmove(find, find + 1, length);
find[length] = '\0';
++find;
continue;
}
// Find matching variable
for (i = 0; i < config->symbols->length; ++i) {
struct sway_variable *var = config->symbols->items[i];
int vnlen = strlen(var->name);
if (strncmp(find, var->name, vnlen) == 0) {
int vvlen = strlen(var->value);
char *newstr = malloc(strlen(str) - vnlen + vvlen + 1);
if (!newstr) {
wlr_log(WLR_ERROR,
"Unable to allocate replacement "
"during variable expansion");
break;
}
char *newptr = newstr;
int offset = find - str;
strncpy(newptr, str, offset);
newptr += offset;
strncpy(newptr, var->value, vvlen);
newptr += vvlen;
strcpy(newptr, find + vnlen);
free(str);
str = newstr;
find = str + offset + vvlen;
break;
}
}
if (i == config->symbols->length) {
++find;
}
}
return str;
}
// the naming is intentional (albeit long): a workspace_output_cmp function
// would compare two structs in full, while this method only compares the
// workspace.
int workspace_output_cmp_workspace(const void *a, const void *b) {
const struct workspace_config *wsa = a, *wsb = b;
return lenient_strcmp(wsa->workspace, wsb->workspace);
}
static void find_font_height_iterator(struct sway_container *con, void *data) {
size_t amount_below_baseline = con->title_height - con->title_baseline;
size_t extended_height = config->font_baseline + amount_below_baseline;
if (extended_height > config->font_height) {
config->font_height = extended_height;
}
}
static void find_baseline_iterator(struct sway_container *con, void *data) {
bool *recalculate = data;
if (*recalculate) {
container_calculate_title_height(con);
}
if (con->title_baseline > config->font_baseline) {
config->font_baseline = con->title_baseline;
}
}
void config_update_font_height(bool recalculate) {
size_t prev_max_height = config->font_height;
config->font_height = 0;
config->font_baseline = 0;
root_for_each_container(find_baseline_iterator, &recalculate);
root_for_each_container(find_font_height_iterator, NULL);
if (config->font_height != prev_max_height) {
arrange_root();
}
}