This is a fork of https://github.com/swaywm/sway that replaces pango with https://codeberg.org/dnkl/fcft for font rendering. Note: do not use the master branch; use one of the fontconfig branches
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#define _POSIX_C_SOURCE 200809L
#include <ctype.h>
#include <dirent.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <wordexp.h>
#include "swaybar/tray/icon.h"
#include "config.h"
#include "list.h"
#include "log.h"
#include "stringop.h"
static int cmp_id(const void *item, const void *cmp_to) {
return strcmp(item, cmp_to);
}
static bool dir_exists(char *path) {
struct stat sb;
return stat(path, &sb) == 0 && S_ISDIR(sb.st_mode);
}
static list_t *get_basedirs(void) {
list_t *basedirs = create_list();
list_add(basedirs, strdup("$HOME/.icons")); // deprecated
char *data_home = getenv("XDG_DATA_HOME");
list_add(basedirs, strdup(data_home && *data_home ?
"$XDG_DATA_HOME/icons" : "$HOME/.local/share/icons"));
list_add(basedirs, strdup("/usr/share/pixmaps"));
char *data_dirs = getenv("XDG_DATA_DIRS");
if (!(data_dirs && *data_dirs)) {
data_dirs = "/usr/local/share:/usr/share";
}
data_dirs = strdup(data_dirs);
char *dir = strtok(data_dirs, ":");
do {
size_t path_len = snprintf(NULL, 0, "%s/icons", dir) + 1;
char *path = malloc(path_len);
snprintf(path, path_len, "%s/icons", dir);
list_add(basedirs, path);
} while ((dir = strtok(NULL, ":")));
free(data_dirs);
list_t *basedirs_expanded = create_list();
for (int i = 0; i < basedirs->length; ++i) {
wordexp_t p;
if (wordexp(basedirs->items[i], &p, WRDE_UNDEF) == 0) {
if (dir_exists(p.we_wordv[0])) {
list_add(basedirs_expanded, strdup(p.we_wordv[0]));
}
wordfree(&p);
}
}
list_free_items_and_destroy(basedirs);
return basedirs_expanded;
}
static void destroy_theme(struct icon_theme *theme) {
if (!theme) {
return;
}
free(theme->name);
free(theme->comment);
list_free_items_and_destroy(theme->inherits);
list_free_items_and_destroy(theme->directories);
free(theme->dir);
for (int i = 0; i < theme->subdirs->length; ++i) {
struct icon_theme_subdir *subdir = theme->subdirs->items[i];
free(subdir->name);
free(subdir);
}
list_free(theme->subdirs);
free(theme);
}
static const char *group_handler(char *old_group, char *new_group,
struct icon_theme *theme) {
if (!old_group) {
return new_group && strcmp(new_group, "Icon Theme") == 0 ? NULL :
"first group must be 'Icon Theme'";
}
if (strcmp(old_group, "Icon Theme") == 0) {
if (!theme->name) {
return "missing required key 'Name'";
} else if (!theme->comment) {
return "missing required key 'Comment'";
} else if (!theme->directories) {
return "missing required key 'Directories'";
} else {
for (char *c = theme->name; *c; ++c) {
if (*c == ',' || *c == ' ') {
return "malformed theme name";
}
}
}
} else {
if (theme->subdirs->length == 0) { // skip
return NULL;
}
struct icon_theme_subdir *subdir =
theme->subdirs->items[theme->subdirs->length - 1];
if (!subdir->size) {
return "missing required key 'Size'";
}
switch (subdir->type) {
case FIXED: subdir->max_size = subdir->min_size = subdir->size;
break;
case SCALABLE: {
if (!subdir->max_size) subdir->max_size = subdir->size;
if (!subdir->min_size) subdir->min_size = subdir->size;
break;
}
case THRESHOLD:
subdir->max_size = subdir->size + subdir->threshold;
subdir->min_size = subdir->size - subdir->threshold;
}
}
if (new_group && list_seq_find(theme->directories, cmp_id, new_group) != -1) {
struct icon_theme_subdir *subdir = calloc(1, sizeof(struct icon_theme_subdir));
if (!subdir) {
return "out of memory";
}
subdir->name = strdup(new_group);
subdir->threshold = 2;
list_add(theme->subdirs, subdir);
}
return NULL;
}
static const char *entry_handler(char *group, char *key, char *value,
struct icon_theme *theme) {
if (strcmp(group, "Icon Theme") == 0) {
if (strcmp(key, "Name") == 0) {
theme->name = strdup(value);
} else if (strcmp(key, "Comment") == 0) {
theme->comment = strdup(value);
} else if (strcmp(key, "Inherits") == 0) {
theme->inherits = split_string(value, ",");
} else if (strcmp(key, "Directories") == 0) {
theme->directories = split_string(value, ",");
} // Ignored: ScaledDirectories, Hidden, Example
} else {
if (theme->subdirs->length == 0) { // skip
return NULL;
}
struct icon_theme_subdir *subdir =
theme->subdirs->items[theme->subdirs->length - 1];
if (strcmp(subdir->name, group) != 0) { // skip
return NULL;
}
if (strcmp(key, "Context") == 0) {
return NULL; // ignored, but explicitly handled to not fail parsing
} else if (strcmp(key, "Type") == 0) {
if (strcmp(value, "Fixed") == 0) {
subdir->type = FIXED;
} else if (strcmp(value, "Scalable") == 0) {
subdir->type = SCALABLE;
} else if (strcmp(value, "Threshold") == 0) {
subdir->type = THRESHOLD;
} else {
return "invalid value - expected 'Fixed', 'Scalable' or 'Threshold'";
}
return NULL;
}
char *end;
int n = strtol(value, &end, 10);
if (*end != '\0') {
return "invalid value - expected a number";
}
if (strcmp(key, "Size") == 0) {
subdir->size = n;
} else if (strcmp(key, "MaxSize") == 0) {
subdir->max_size = n;
} else if (strcmp(key, "MinSize") == 0) {
subdir->min_size = n;
} else if (strcmp(key, "Threshold") == 0) {
subdir->threshold = n;
} // Ignored: Scale
}
return NULL;
}
/*
* This is a Freedesktop Desktop Entry parser (essentially INI)
* It calls entry_handler for every entry
* and group_handler between every group (as well as at both ends)
* Handlers return whether an error occurred, which stops parsing
*/
static struct icon_theme *read_theme_file(char *basedir, char *theme_name) {
// look for index.theme file
size_t path_len = snprintf(NULL, 0, "%s/%s/index.theme", basedir,
theme_name) + 1;
char *path = malloc(path_len);
if (!path) {
return NULL;
}
snprintf(path, path_len, "%s/%s/index.theme", basedir, theme_name);
FILE *theme_file = fopen(path, "r");
free(path);
if (!theme_file) {
return NULL;
}
struct icon_theme *theme = calloc(1, sizeof(struct icon_theme));
if (!theme) {
fclose(theme_file);
return NULL;
}
theme->subdirs = create_list();
list_t *groups = create_list();
const char *error = NULL;
int line_no = 0;
char *full_line = NULL;
size_t full_len = 0;
ssize_t nread;
while ((nread = getline(&full_line, &full_len, theme_file)) != -1) {
++line_no;
char *line = full_line - 1;
while (isspace(*++line)) {} // remove leading whitespace
if (!*line || line[0] == '#') continue; // ignore blank lines & comments
int len = nread - (line - full_line);
while (isspace(line[--len])) {}
line[++len] = '\0'; // remove trailing whitespace
if (line[0] == '[') { // group header
// check well-formed
int i = 1;
for (; !iscntrl(line[i]) && line[i] != '[' && line[i] != ']'; ++i) {}
if (i != --len || line[i] != ']') {
error = "malformed group header";
break;
}
line[len] = '\0';
// check group is not duplicate
if (list_seq_find(groups, cmp_id, &line[1]) != -1) {
error = "duplicate group";
break;
}
// call handler
char *last_group = groups->length > 0 ? groups->items[groups->length - 1] : NULL;
error = group_handler(last_group, &line[1], theme);
if (error) {
break;
}
list_add(groups, strdup(&line[1]));
} else { // key-value pair
if (groups->length == 0) {
error = "unexpected content before first header";
break;
}
// check well-formed
int eok = 0;
for (; isalnum(line[eok]) || line[eok] == '-'; ++eok) {} // TODO locale?
int i = eok - 1;
while (isspace(line[++i])) {}
if (line[i] != '=') {
error = "malformed key-value pair";
break;
}
line[eok] = '\0'; // split into key-value pair
char *value = &line[i];
while (isspace(*++value)) {}
// TODO unescape value
error = entry_handler(groups->items[groups->length - 1], line,
value, theme);
if (error) {
break;
}
}
}
if (!error) {
if (groups->length > 0) {
error = group_handler(groups->items[groups->length - 1], NULL, theme);
} else {
error = "empty file";
}
}
if (!error) {
theme->dir = strdup(theme_name);
} else {
char *last_group = groups->length > 0 ? groups->items[groups->length-1] : "n/a";
sway_log(SWAY_DEBUG, "Failed to load theme '%s' - parsing of file "
"'%s/%s/index.theme' failed on line %d (group '%s'): %s",
theme_name, basedir, theme_name, line_no, last_group, error);
destroy_theme(theme);
theme = NULL;
}
free(full_line);
list_free_items_and_destroy(groups);
fclose(theme_file);
return theme;
}
static list_t *load_themes_in_dir(char *basedir) {
DIR *dir;
if (!(dir = opendir(basedir))) {
return NULL;
}
list_t *themes = create_list();
struct dirent *entry;
while ((entry = readdir(dir))) {
if (entry->d_name[0] == '.') continue;
struct icon_theme *theme = read_theme_file(basedir, entry->d_name);
if (theme) {
list_add(themes, theme);
}
}
closedir(dir);
return themes;
}
static void log_loaded_themes(list_t *themes) {
if (themes->length == 0) {
sway_log(SWAY_INFO, "Warning: no icon themes loaded");
return;
}
const char sep[] = ", ";
size_t sep_len = strlen(sep);
size_t len = 0;
for (int i = 0; i < themes->length; ++i) {
struct icon_theme *theme = themes->items[i];
len += strlen(theme->name) + sep_len;
}
char *str = malloc(len + 1);
if (!str) {
return;
}
char *p = str;
for (int i = 0; i < themes->length; ++i) {
if (i > 0) {
memcpy(p, sep, sep_len);
p += sep_len;
}
struct icon_theme *theme = themes->items[i];
size_t name_len = strlen(theme->name);
memcpy(p, theme->name, name_len);
p += name_len;
}
*p = '\0';
sway_log(SWAY_DEBUG, "Loaded icon themes: %s", str);
free(str);
}
void init_themes(list_t **themes, list_t **basedirs) {
*basedirs = get_basedirs();
*themes = create_list();
for (int i = 0; i < (*basedirs)->length; ++i) {
list_t *dir_themes = load_themes_in_dir((*basedirs)->items[i]);
if (dir_themes == NULL) {
continue;
}
list_cat(*themes, dir_themes);
list_free(dir_themes);
}
log_loaded_themes(*themes);
}
void finish_themes(list_t *themes, list_t *basedirs) {
for (int i = 0; i < themes->length; ++i) {
destroy_theme(themes->items[i]);
}
list_free(themes);
list_free_items_and_destroy(basedirs);
}
static char *find_icon_in_subdir(char *name, char *basedir, char *theme,
char *subdir) {
static const char *extensions[] = {
#if HAVE_GDK_PIXBUF
"svg",
#endif
"png",
#if HAVE_GDK_PIXBUF
"xpm" // deprecated
#endif
};
size_t path_len = snprintf(NULL, 0, "%s/%s/%s/%s.EXT", basedir, theme,
subdir, name) + 1;
char *path = malloc(path_len);
for (size_t i = 0; i < sizeof(extensions) / sizeof(*extensions); ++i) {
snprintf(path, path_len, "%s/%s/%s/%s.%s", basedir, theme, subdir,
name, extensions[i]);
if (access(path, R_OK) == 0) {
return path;
}
}
free(path);
return NULL;
}
static bool theme_exists_in_basedir(char *theme, char *basedir) {
size_t path_len = snprintf(NULL, 0, "%s/%s", basedir, theme) + 1;
char *path = malloc(path_len);
snprintf(path, path_len, "%s/%s", basedir, theme);
bool ret = dir_exists(path);
free(path);
return ret;
}
static char *find_icon_with_theme(list_t *basedirs, list_t *themes, char *name,
int size, char *theme_name, int *min_size, int *max_size) {
struct icon_theme *theme = NULL;
for (int i = 0; i < themes->length; ++i) {
theme = themes->items[i];
if (strcmp(theme->name, theme_name) == 0) {
break;
}
theme = NULL;
}
if (!theme) return NULL;
char *icon = NULL;
for (int i = 0; i < basedirs->length; ++i) {
if (!theme_exists_in_basedir(theme->dir, basedirs->items[i])) {
continue;
}
// search backwards to hopefully hit scalable/larger icons first
for (int j = theme->subdirs->length - 1; j >= 0; --j) {
struct icon_theme_subdir *subdir = theme->subdirs->items[j];
if (size >= subdir->min_size && size <= subdir->max_size) {
if ((icon = find_icon_in_subdir(name, basedirs->items[i],
theme->dir, subdir->name))) {
*min_size = subdir->min_size;
*max_size = subdir->max_size;
return icon;
}
}
}
}
// inexact match
unsigned smallest_error = -1; // UINT_MAX
for (int i = 0; i < basedirs->length; ++i) {
if (!theme_exists_in_basedir(theme->dir, basedirs->items[i])) {
continue;
}
for (int j = theme->subdirs->length - 1; j >= 0; --j) {
struct icon_theme_subdir *subdir = theme->subdirs->items[j];
unsigned error = (size > subdir->max_size ? size - subdir->max_size : 0)
+ (size < subdir->min_size ? subdir->min_size - size : 0);
if (error < smallest_error) {
char *test_icon = find_icon_in_subdir(name, basedirs->items[i],
theme->dir, subdir->name);
if (test_icon) {
icon = test_icon;
smallest_error = error;
*min_size = subdir->min_size;
*max_size = subdir->max_size;
}
}
}
}
if (!icon && theme->inherits) {
for (int i = 0; i < theme->inherits->length; ++i) {
icon = find_icon_with_theme(basedirs, themes, name, size,
theme->inherits->items[i], min_size, max_size);
if (icon) {
break;
}
}
}
return icon;
}
static char *find_fallback_icon(list_t *basedirs, char *name, int *min_size,
int *max_size) {
for (int i = 0; i < basedirs->length; ++i) {
char *icon = find_icon_in_subdir(name, basedirs->items[i], "", "");
if (icon) {
*min_size = 1;
*max_size = 512;
return icon;
}
}
return NULL;
}
char *find_icon(list_t *themes, list_t *basedirs, char *name, int size,
char *theme, int *min_size, int *max_size) {
// TODO https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html#implementation_notes
char *icon = NULL;
if (theme) {
icon = find_icon_with_theme(basedirs, themes, name, size, theme,
min_size, max_size);
}
if (!icon && !(theme && strcmp(theme, "Hicolor") == 0)) {
icon = find_icon_with_theme(basedirs, themes, name, size, "Hicolor",
min_size, max_size);
}
if (!icon) {
icon = find_fallback_icon(basedirs, name, min_size, max_size);
}
return icon;
}