[chaz/tint2] / src / launcher / launcher.c

/**************************************************************************
* Tint2 : launcher
*
* Copyright (C) 2010       (mrovi@interfete-web-club.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**************************************************************************/

#include <string.h>
#include <stdio.h>
#include <cairo.h>
#include <cairo-xlib.h>
#include <pango/pangocairo.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>

#include "window.h"
#include "server.h"
#include "area.h"
#include "panel.h"
#include "taskbar.h"
#include "launcher.h"

int launcher_enabled;
int launcher_max_icon_size;
char *icon_theme_name; 
XSettingsClient *xsettings_client;

#define ICON_FALLBACK "application-x-executable"

char *icon_path(Launcher *launcher, const char *icon_name, int size);
void launcher_load_themes(Launcher *launcher);
void free_desktop_entry(DesktopEntry *entry);
int launcher_read_desktop_file(const char *path, DesktopEntry *entry);
Imlib_Image scale_icon(Imlib_Image original, int icon_size);
void free_icon(Imlib_Image icon);
void free_icon_theme(IconTheme *theme);


void default_launcher()
{
        launcher_enabled = 0;
        launcher_max_icon_size = 0;
        icon_theme_name = 0;
        xsettings_client = NULL;
}


void init_launcher()
{
        if (launcher_enabled) {
                // if XSETTINGS manager running, tint2 read the icon_theme_name.
                xsettings_client = xsettings_client_new(server.dsp, server.screen, xsettings_notify_cb, NULL, NULL);
        }
}


void init_launcher_panel(void *p)
{
        Panel *panel =(Panel*)p;
        Launcher *launcher = &panel->launcher;

        launcher->area.parent = p;
        launcher->area.panel = p;
        launcher->area._draw_foreground = NULL;
        launcher->area.size_mode = SIZE_BY_CONTENT;
        launcher->area._resize = resize_launcher;
        launcher->area.resize = 1;
        launcher->area.redraw = 1;
        if (launcher->area.bg == 0)
                launcher->area.bg = &g_array_index(backgrounds, Background, 0);

        // check consistency
        if (launcher->list_apps == NULL)
                return;

        launcher->area.on_screen = 1;
        panel_refresh = 1;

        launcher_load_themes(launcher);
        launcher_load_icons(launcher);
}


void cleanup_launcher()
{
        int i;

        if (xsettings_client)
                xsettings_client_destroy(xsettings_client);
        for (i = 0 ; i < nb_panel ; i++) {
                Panel *panel = &panel1[i];
                Launcher *launcher = &panel->launcher;          
                cleanup_launcher_theme(launcher);
                
                GSList *l;
                for (l = launcher->list_apps; l ; l = l->next) {
                        free(l->data);
                }
                g_slist_free(launcher->list_apps);
                launcher->list_apps = NULL;
        }
        g_free(icon_theme_name);
        launcher_enabled = 0;
}


void cleanup_launcher_theme(Launcher *launcher)
{
        free_area(&launcher->area);
        GSList *l;
        for (l = launcher->list_icons; l ; l = l->next) {
                LauncherIcon *launcherIcon = (LauncherIcon*)l->data;
                if (launcherIcon) {
                        free_icon(launcherIcon->icon_scaled);
                        free_icon(launcherIcon->icon_original);
                        free(launcherIcon->icon_name);
                        free(launcherIcon->icon_path);
                        free(launcherIcon->cmd);
                        free(launcherIcon->icon_tooltip);
                }
                free(launcherIcon);
        }
        g_slist_free(launcher->list_icons);

        for (l = launcher->list_themes; l ; l = l->next) {
                IconTheme *theme = (IconTheme*) l->data;
                free_icon_theme(theme);
                free(theme);
        }
        g_slist_free(launcher->list_themes);
        launcher->list_icons = launcher->list_themes = NULL;
}


int resize_launcher(void *obj)
{
        Launcher *launcher = obj;
        GSList *l;
        int count, icon_size;
        int icons_per_column=1, icons_per_row=1, marging=0;

        if (panel_horizontal)
                icon_size = launcher->area.height;
        else
                icon_size = launcher->area.width;
        icon_size = icon_size - (2 * launcher->area.bg->border.width) - (2 * launcher->area.paddingy);
        if (launcher_max_icon_size > 0 && icon_size > launcher_max_icon_size)
                icon_size = launcher_max_icon_size;

        // Resize icons if necessary
        for (l = launcher->list_icons; l ; l = l->next) {
                LauncherIcon *launcherIcon = (LauncherIcon *)l->data;
                if (launcherIcon->icon_size != icon_size || !launcherIcon->icon_original) {
                        launcherIcon->icon_size = icon_size;
                        launcherIcon->area.width = launcherIcon->icon_size;
                        launcherIcon->area.height = launcherIcon->icon_size;

                        // Get the path for an icon file with the new size
                        char *new_icon_path = icon_path(launcher, launcherIcon->icon_name, launcherIcon->icon_size);
                        if (!new_icon_path) {
                                // Draw a blank icon
                                free_icon(launcherIcon->icon_original);
                                launcherIcon->icon_original = NULL;
                                free_icon(launcherIcon->icon_scaled);
                                launcherIcon->icon_scaled = NULL;
                                new_icon_path = icon_path(launcher, ICON_FALLBACK, launcherIcon->icon_size);
                                if (new_icon_path) {
                                        launcherIcon->icon_original = imlib_load_image(new_icon_path);
                                        fprintf(stderr, "launcher.c %d: Using icon %s\n", __LINE__, new_icon_path);
                                        free(new_icon_path);
                                }
                                launcherIcon->icon_scaled = scale_icon(launcherIcon->icon_original, icon_size);
                                continue;
                        }
                        if (launcherIcon->icon_path && strcmp(new_icon_path, launcherIcon->icon_path) == 0) {
                                // If it's the same file just rescale
                                free_icon(launcherIcon->icon_scaled);
                                launcherIcon->icon_scaled = scale_icon(launcherIcon->icon_original, icon_size);
                                free(new_icon_path);
                                fprintf(stderr, "launcher.c %d: Using icon %s\n", __LINE__, launcherIcon->icon_path);
                        } else {
                                // Free the old files
                                free_icon(launcherIcon->icon_original);
                                free_icon(launcherIcon->icon_scaled);
                                // Load the new file and scale
                                launcherIcon->icon_original = imlib_load_image(new_icon_path);
                                launcherIcon->icon_scaled = scale_icon(launcherIcon->icon_original, launcherIcon->icon_size);
                                free(launcherIcon->icon_path);
                                launcherIcon->icon_path = new_icon_path;
                                fprintf(stderr, "launcher.c %d: Using icon %s\n", __LINE__, launcherIcon->icon_path);
                        }
                }
        }
        
        count = g_slist_length(launcher->list_icons);

        if (panel_horizontal) {
                if (!count) launcher->area.width = 0;
                else {
                        int height = launcher->area.height - 2*launcher->area.bg->border.width - 2*launcher->area.paddingy;
                        // here icons_per_column always higher than 0
                        icons_per_column = (height+launcher->area.paddingx) / (icon_size+launcher->area.paddingx);
                        marging = height - (icons_per_column-1)*(icon_size+launcher->area.paddingx) - icon_size;
                        icons_per_row = count / icons_per_column + (count%icons_per_column != 0);
                        launcher->area.width = (2 * launcher->area.bg->border.width) + (2 * launcher->area.paddingxlr) + (icon_size * icons_per_row) + ((icons_per_row-1) * launcher->area.paddingx);
                }
        }
        else {
                if (!count) launcher->area.height = 0;
                else {
                        int width = launcher->area.width - 2*launcher->area.bg->border.width - 2*launcher->area.paddingy;
                        // here icons_per_row always higher than 0
                        icons_per_row = (width+launcher->area.paddingx) / (icon_size+launcher->area.paddingx);
                        marging = width - (icons_per_row-1)*(icon_size+launcher->area.paddingx) - icon_size;
                        icons_per_column = count / icons_per_row+ (count%icons_per_row != 0);
                        launcher->area.height = (2 * launcher->area.bg->border.width) + (2 * launcher->area.paddingxlr) + (icon_size * icons_per_column) + ((icons_per_column-1) * launcher->area.paddingx);
                }
        }

        int i, posx, posy;
        int start = launcher->area.bg->border.width + launcher->area.paddingy + marging/2;
        if (panel_horizontal) {
                posy = start;
                posx = launcher->area.bg->border.width + launcher->area.paddingxlr;
        }
        else {
                posx = start;
                posy = launcher->area.bg->border.width + launcher->area.paddingxlr;
        }

        for (i=1, l = launcher->list_icons; l ; i++, l = l->next) {
                LauncherIcon *launcherIcon = (LauncherIcon*)l->data;
                
                launcherIcon->y = posy;
                launcherIcon->x = posx;
                //printf("launcher %d : %d,%d\n", i, posx, posy);
                if (panel_horizontal) {
                        if (i % icons_per_column)
                                posy += icon_size + launcher->area.paddingx;
                        else {
                                posy = start;
                                posx += (icon_size + launcher->area.paddingx);
                        }
                }
                else {
                        if (i % icons_per_row)
                                posx += icon_size + launcher->area.paddingx;
                        else {
                                posx = start;
                                posy += (icon_size + launcher->area.paddingx);
                        }
                }
        }
        return 1;
}

// Here we override the default layout of the icons; normally Area layouts its children
// in a stack; we need to layout them in a kind of table
void launcher_icon_on_change_layout(void *obj)
{
        LauncherIcon *launcherIcon = (LauncherIcon*)obj;
        launcherIcon->area.posy = ((Area*)launcherIcon->area.parent)->posy + launcherIcon->y;
        launcherIcon->area.posx = ((Area*)launcherIcon->area.parent)->posx + launcherIcon->x;
}

const char* launcher_icon_get_tooltip_text(void *obj)
{
        LauncherIcon *launcherIcon = (LauncherIcon*)obj;
        return launcherIcon->icon_tooltip;
}

void draw_launcher_icon(void *obj, cairo_t *c)
{
        LauncherIcon *launcherIcon = (LauncherIcon*)obj;
        Imlib_Image icon_scaled = launcherIcon->icon_scaled;
        // Render
        imlib_context_set_image (icon_scaled);
        if (server.real_transparency) {
                render_image(launcherIcon->area.pix, 0, 0, imlib_image_get_width(), imlib_image_get_height() );
        } else {
                imlib_context_set_drawable(launcherIcon->area.pix);
                imlib_render_image_on_drawable (0, 0);
        }
}

Imlib_Image scale_icon(Imlib_Image original, int icon_size)
{
        Imlib_Image icon_scaled;
        if (original) {
                imlib_context_set_image (original);
                icon_scaled = imlib_create_cropped_scaled_image(0, 0, imlib_image_get_width(), imlib_image_get_height(), icon_size, icon_size);
        } else {
                icon_scaled = imlib_create_image(icon_size, icon_size);
                imlib_context_set_image (icon_scaled);
                imlib_context_set_color(255, 255, 255, 255);
                imlib_image_fill_rectangle(0, 0, icon_size, icon_size);
        }
        return icon_scaled;
}

void free_icon(Imlib_Image icon)
{
        if (icon) {
                imlib_context_set_image(icon);
                imlib_free_image();
        }
}

void launcher_action(LauncherIcon *icon)
{
        char *cmd = malloc(strlen(icon->cmd) + 10);
        sprintf(cmd, "(%s&)", icon->cmd);
        tint_exec(cmd);
        free(cmd);
}

/***************** Freedesktop app.desktop and icon theme handling  *********************/
/* http://standards.freedesktop.org/desktop-entry-spec/ */
/* http://standards.freedesktop.org/icon-theme-spec/ */

// Splits line at first '=' and returns 1 if successful, and parts are not empty
// key and value point to the parts
int parse_dektop_line(char *line, char **key, char **value)
{
        char *p;
        int found = 0;
        *key = line;
        for (p = line; *p; p++) {
                if (*p == '=') {
                        *value = p + 1;
                        *p = 0;
                        found = 1;
                        break;
                }
        }
        if (!found)
                return 0;
        if (found && (strlen(*key) == 0 || strlen(*value) == 0))
                return 0;
        return 1;
}

int parse_theme_line(char *line, char **key, char **value)
{
        return parse_dektop_line(line, key, value);
}

void expand_exec(DesktopEntry *entry, const char *path)
{
        // Expand % in exec
        // %i -> --icon Icon
        // %c -> Name
        // %k -> path
        if (entry->exec) {
                char *exec2 = malloc(strlen(entry->exec) + (entry->name ? strlen(entry->name) : 1) + (entry->icon ? strlen(entry->icon) : 1) + 100);
                char *p, *q;
                // p will never point to an escaped char
                for (p = entry->exec, q = exec2; *p; p++, q++) {
                        *q = *p; // Copy
                        if (*p == '\\') {
                                p++, q++;
                                // Copy the escaped char
                                if (*p == '%') // For % we delete the backslash, i.e. write % over it
                                        q--;
                                *q = *p;
                                if (!*p) break;
                                continue;
                        }
                        if (*p == '%') {
                                p++;
                                if (!*p) break;
                                if (*p == 'i' && entry->icon != NULL) {
                                        sprintf(q, "--icon '%s'", entry->icon);
                                        q += strlen("--icon ''");
                                        q += strlen(entry->icon);
                                        q--; // To balance the q++ in the for
                                } else if (*p == 'c' && entry->name != NULL) {
                                        sprintf(q, "'%s'", entry->name);
                                        q += strlen("''");
                                        q += strlen(entry->name);
                                        q--; // To balance the q++ in the for
                                } else if (*p == 'c') {
                                        sprintf(q, "'%s'", path);
                                        q += strlen("''");
                                        q += strlen(path);
                                        q--; // To balance the q++ in the for
                                } else {
                                        // We don't care about other expansions
                                        q--; // Delete the last % from q
                                }
                                continue;
                        }
                }
                *q = '\0';
                free(entry->exec);
                entry->exec = exec2;
        }
}

//TODO Use UTF8 when parsing the file
int launcher_read_desktop_file(const char *path, DesktopEntry *entry)
{
        FILE *fp;
        char *line = NULL;
        size_t line_size;
        char *key, *value;

        entry->name = entry->icon = entry->exec = NULL;

        if ((fp = fopen(path, "rt")) == NULL) {
                fprintf(stderr, "Could not open file %s\n", path);
                return 0;
        }

        int inside_desktop_entry = 0;
        while (getline(&line, &line_size, fp) >= 0) {
                int len = strlen(line);
                if (len == 0)
                        continue;
                line[len - 1] = '\0';
                if (line[0] == '[') {
                        inside_desktop_entry = (strcmp(line, "[Desktop Entry]") == 0);
                }
                if (inside_desktop_entry && parse_dektop_line(line, &key, &value)) {
                        if (!entry->name && strcmp(key, "Name") == 0) {
                                entry->name = strdup(value);
                        } else if (!entry->exec && strcmp(key, "Exec") == 0) {
                                entry->exec = strdup(value);
                        } else if (!entry->icon && strcmp(key, "Icon") == 0) {
                                entry->icon = strdup(value);
                        }
                }
        }
        fclose (fp);
        // From this point:
        // entry->name, entry->icon, entry->exec will never be empty strings (can be NULL though)

        expand_exec(entry, path);
        
        free(line);
        return 1;
}

void free_desktop_entry(DesktopEntry *entry)
{
        free(entry->name);
        free(entry->icon);
        free(entry->exec);
}

void test_launcher_read_desktop_file()
{
        fprintf(stdout, "\033[1;33m");
        DesktopEntry entry;
        launcher_read_desktop_file("/usr/share/applications/firefox.desktop", &entry);
        printf("Name:%s Icon:%s Exec:%s\n", entry.name, entry.icon, entry.exec);
        fprintf(stdout, "\033[0m");
}

//TODO Use UTF8 when parsing the file
IconTheme *load_theme(char *name)
{
        // Look for name/index.theme in $HOME/.icons, /usr/share/icons, /usr/share/pixmaps (stop at the first found)
        // Parse index.theme -> list of IconThemeDir with attributes
        // Return IconTheme*

        IconTheme *theme;
        char *file_name;
        FILE *f;
        char *line = NULL;
        size_t line_size;

        if (name == NULL)
                return NULL;

        file_name = g_build_filename(g_get_home_dir(), ".icons", name, "index.theme", NULL);
        if (!g_file_test(file_name, G_FILE_TEST_EXISTS)) {
                g_free (file_name);
                file_name = g_build_filename("/usr/share/icons", name, "index.theme", NULL);
                if (!g_file_test(file_name, G_FILE_TEST_EXISTS)) {
                        g_free (file_name);
                        file_name = g_build_filename("/usr/share/pixmaps", name, "index.theme", NULL);
                        if (!g_file_test(file_name, G_FILE_TEST_EXISTS)) {
                                g_free (file_name);
                                file_name = NULL;
                        }
                }
        }

        if (!file_name) {
                return NULL;
        }

        if ((f = fopen(file_name, "rt")) == NULL) {
                fprintf(stderr, "Could not open theme '%s'\n", file_name);
                return NULL;
        }

        g_free (file_name);

        theme = calloc(1, sizeof(IconTheme));
        theme->name = strdup(name);
        theme->list_inherits = NULL;
        theme->list_directories = NULL;

        IconThemeDir *current_dir = NULL;
        int inside_header = 1;
        while (getline(&line, &line_size, f) >= 0) {
                char *key, *value;
                
                int line_len = strlen(line);
                if (line_len >= 1) {
                        if (line[line_len - 1] == '\n') {
                                line[line_len - 1] = '\0';
                                line_len--;
                        }
                }

                if (line_len == 0)
                        continue;

                if (inside_header) {
                        if (parse_theme_line(line, &key, &value)) {
                                if (strcmp(key, "Inherits") == 0) {
                                        // value is like oxygen,wood,default
                                        char *token;
                                        token = strtok(value, ",\n");
                                        while (token != NULL)
                                        {
                                                theme->list_inherits = g_slist_append(theme->list_inherits, strdup(token));
                                                token = strtok(NULL, ",\n");
                                        }
                                } else if (strcmp(key, "Directories") == 0) {
                                        // value is like 48x48/apps,48x48/mimetypes,32x32/apps,scalable/apps,scalable/mimetypes
                                        char *token;
                                        token = strtok(value, ",\n");
                                        while (token != NULL)
                                        {
                                                IconThemeDir *dir = calloc(1, sizeof(IconThemeDir));
                                                dir->name = strdup(token);
                                                dir->max_size = dir->min_size = dir->size = -1;
                                                dir->type = ICON_DIR_TYPE_THRESHOLD;
                                                dir->threshold = 2;
                                                theme->list_directories = g_slist_append(theme->list_directories, dir);
                                                token = strtok(NULL, ",\n");
                                        }
                                }
                        }
                } else if (current_dir != NULL) {
                        if (parse_theme_line(line, &key, &value)) {
                                if (strcmp(key, "Size") == 0) {
                                        // value is like 24
                                        sscanf(value, "%d", &current_dir->size);
                                        if (current_dir->max_size == -1)
                                                current_dir->max_size = current_dir->size;
                                        if (current_dir->min_size == -1)
                                                current_dir->min_size = current_dir->size;
                                } else if (strcmp(key, "MaxSize") == 0) {
                                        // value is like 24
                                        sscanf(value, "%d", &current_dir->max_size);
                                } else if (strcmp(key, "MinSize") == 0) {
                                        // value is like 24
                                        sscanf(value, "%d", &current_dir->min_size);
                                } else if (strcmp(key, "Threshold") == 0) {
                                        // value is like 2
                                        sscanf(value, "%d", &current_dir->threshold);
                                } else if (strcmp(key, "Type") == 0) {
                                        // value is Fixed, Scalable or Threshold : default to scalable for unknown Type.
                                        if (strcmp(value, "Fixed") == 0) {
                                                current_dir->type = ICON_DIR_TYPE_FIXED;
                                        } else if (strcmp(value, "Threshold") == 0) {
                                                current_dir->type = ICON_DIR_TYPE_THRESHOLD;
                                        } else {
                                                current_dir->type = ICON_DIR_TYPE_SCALABLE;
                                        }
                                } else if (strcmp(key, "Context") == 0) {
                                        // usual values: Actions, Applications, Devices, FileSystems, MimeTypes
                                        current_dir->context = strdup(value);
                                }
                        }
                }

                if (line[0] == '[' && line[line_len - 1] == ']' && strcmp(line, "[Icon Theme]") != 0) {
                        inside_header = 0;
                        current_dir = NULL;
                        line[line_len - 1] = '\0';
                        char *dir_name = line + 1;
                        GSList* dir_item = theme->list_directories;
                        while (dir_item != NULL)
                        {
                                IconThemeDir *dir = dir_item->data;
                                if (strcmp(dir->name, dir_name) == 0) {
                                        current_dir = dir;
                                        break;
                                }
                                dir_item = g_slist_next(dir_item);
                        }
                }
        }
        fclose(f);
        
        free(line);
        
        return theme;
}

void free_icon_theme(IconTheme *theme)
{
        free(theme->name);
        GSList *l_inherits;
        for (l_inherits = theme->list_inherits; l_inherits ; l_inherits = l_inherits->next) {
                free(l_inherits->data);
        }
        GSList *l_dir;
        for (l_dir = theme->list_directories; l_dir ; l_dir = l_dir->next) {
                IconThemeDir *dir = (IconThemeDir *)l_dir->data;
                free(dir->name);
                free(dir->context);
                free(l_dir->data);
        }
}

void test_launcher_read_theme_file()
{
        fprintf(stdout, "\033[1;33m");
        IconTheme *theme = load_theme("oxygen");
        if (!theme) {
                printf("Could not load theme\n");
                return;
        }
        printf("Loaded theme: %s\n", theme->name);
        GSList* item = theme->list_inherits;
        while (item != NULL)
        {
                printf("Inherits:%s\n", (char*)item->data);
                item = g_slist_next(item);
        }
        item = theme->list_directories;
        while (item != NULL)
        {
                IconThemeDir *dir = item->data;
                printf("Dir:%s Size=%d MinSize=%d MaxSize=%d Threshold=%d Type=%s Context=%s\n",
                           dir->name, dir->size, dir->min_size, dir->max_size, dir->threshold,
                           dir->type == ICON_DIR_TYPE_FIXED ? "Fixed" :
                           dir->type == ICON_DIR_TYPE_SCALABLE ? "Scalable" :
                           dir->type == ICON_DIR_TYPE_THRESHOLD ? "Threshold" : "?????",
                           dir->context);
                item = g_slist_next(item);
        }
        fprintf(stdout, "\033[0m");
}


// Populates the list_icons list
void launcher_load_icons(Launcher *launcher)
{
        // Load apps (.desktop style launcher items)
        GSList* app = launcher->list_apps;
        while (app != NULL) {
                DesktopEntry entry;
                launcher_read_desktop_file(app->data, &entry);
                if (entry.exec) {
                        LauncherIcon *launcherIcon = calloc(1, sizeof(LauncherIcon));
                        launcherIcon->area.parent = launcher;
                        launcherIcon->area.panel = launcher->area.panel;
                        launcherIcon->area._draw_foreground = draw_launcher_icon;
                        launcherIcon->area.size_mode = SIZE_BY_CONTENT;
                        launcherIcon->area._resize = NULL;
                        launcherIcon->area.resize = 0;
                        launcherIcon->area.redraw = 1;
                        launcherIcon->area.bg = &g_array_index(backgrounds, Background, 0);
                        launcherIcon->area.on_screen = 1;
                        launcherIcon->area._on_change_layout = launcher_icon_on_change_layout;
                        launcherIcon->area._get_tooltip_text = launcher_icon_get_tooltip_text;
                        launcherIcon->is_app_desktop = 1;
                        launcherIcon->cmd = strdup(entry.exec);
                        launcherIcon->icon_name = entry.icon ? strdup(entry.icon) : strdup(ICON_FALLBACK);
                        launcherIcon->icon_size = 1;
                        launcherIcon->icon_tooltip = entry.name ? strdup(entry.name) : strdup(entry.exec);
                        free_desktop_entry(&entry);
                        launcher->list_icons = g_slist_append(launcher->list_icons, launcherIcon);
                        add_area(&launcherIcon->area);
                }
                app = g_slist_next(app);
        }
}


// Populates the list_themes list
void launcher_load_themes(Launcher *launcher)
{
        // load the user theme, all the inherited themes recursively (DFS), and the hicolor theme
        // avoid inheritance loops
        if (!icon_theme_name) {
                fprintf(stderr, "Missing launcher theme, default to 'hicolor'.\n");
                icon_theme_name = strdup("hicolor");
        } else {
                fprintf(stderr, "Loading %s. Icon theme :", icon_theme_name);
        }

        GSList *queue = g_slist_append(NULL, strdup(icon_theme_name));
        GSList *queued = g_slist_append(NULL, strdup(icon_theme_name));

        int hicolor_loaded = 0;
        while (queue || !hicolor_loaded) {
                if (!queue) {
                        GSList* queued_item = queued;
                        while (queued_item != NULL) {
                                if (strcmp(queued_item->data, "hicolor") == 0) {
                                        hicolor_loaded = 1;
                                        break;
                                }
                                queued_item = g_slist_next(queued_item);
                        }
                        if (hicolor_loaded)
                                break;
                        queue = g_slist_append(queue, strdup("hicolor"));
                        queued = g_slist_append(queued, strdup("hicolor"));
                }
                
                char *name = queue->data;
                queue = g_slist_remove(queue, name);

                fprintf(stderr, " '%s',", name);
                IconTheme *theme = load_theme(name);
                if (theme != NULL) {
                        launcher->list_themes = g_slist_append(launcher->list_themes, theme);

                        GSList* item = theme->list_inherits;
                        int pos = 0;
                        while (item != NULL)
                        {
                                char *parent = item->data;
                                int duplicate = 0;
                                GSList* queued_item = queued;
                                while (queued_item != NULL) {
                                        if (strcmp(queued_item->data, parent) == 0) {
                                                duplicate = 1;
                                                break;
                                        }
                                        queued_item = g_slist_next(queued_item);
                                }
                                if (!duplicate) {
                                        queue = g_slist_insert(queue, strdup(parent), pos);
                                        pos++;
                                        queued = g_slist_append(queued, strdup(parent));
                                }
                                item = g_slist_next(item);
                        }
                }
        }
        fprintf(stderr, "\n");

        // Free the queue
        GSList *l;
        for (l = queue; l ; l = l->next)
                free(l->data);
        g_slist_free(queue);
        for (l = queued; l ; l = l->next)
                free(l->data);
        g_slist_free(queued);
}

int directory_matches_size(IconThemeDir *dir, int size)
{
        if (dir->type == ICON_DIR_TYPE_FIXED) {
                return dir->size == size;
        } else if (dir->type == ICON_DIR_TYPE_SCALABLE) {
                return dir->min_size <= size && size <= dir->max_size;
        } else /*if (dir->type == ICON_DIR_TYPE_THRESHOLD)*/ {
                return dir->size - dir->threshold <= size && size <= dir->size + dir->threshold;
        }
}

int directory_size_distance(IconThemeDir *dir, int size)
{
        if (dir->type == ICON_DIR_TYPE_FIXED) {
                return abs(dir->size - size);
        } else if (dir->type == ICON_DIR_TYPE_SCALABLE) {
                if (size < dir->min_size) {
                        return dir->min_size - size;
                } else if (size > dir->max_size) {
                        return size - dir->max_size;
                } else {
                        return 0;
                }
        } else /*if (dir->type == ICON_DIR_TYPE_THRESHOLD)*/ {
                if (size < dir->size - dir->threshold) {
                        return dir->min_size - size;
                } else if (size > dir->size + dir->threshold) {
                        return size - dir->max_size;
                } else {
                        return 0;
                }
        }
}

// Returns the full path to an icon file (or NULL) given the icon name
char *icon_path(Launcher *launcher, const char *icon_name, int size)
{
        if (icon_name == NULL)
                return NULL;
        
        // If the icon_name is already a path and the file exists, return it
        if (strstr(icon_name, "/") == icon_name) {
                if (g_file_test(icon_name, G_FILE_TEST_EXISTS))
                        return strdup(icon_name);
                else
                        return NULL;
        }

        GSList *basenames = NULL;
        char *home_icons = g_build_filename(g_get_home_dir(), ".icons", NULL);
        basenames = g_slist_append(basenames, home_icons);
        basenames = g_slist_append(basenames, "/usr/share/icons");
        basenames = g_slist_append(basenames, "/usr/share/pixmaps");

        GSList *extensions = NULL;
        extensions = g_slist_append(extensions, ".png");
        extensions = g_slist_append(extensions, ".xpm");
        // if the icon name already contains one of the extensions (e.g. vlc.png instead of vlc) add a special entry
        GSList *ext;
        for (ext = extensions; ext; ext = g_slist_next(ext)) {
                char *extension = (char*) ext->data;
                if (strlen(icon_name) > strlen(extension) &&
                        strcmp(extension, icon_name + strlen(icon_name) - strlen(extension)) == 0) {
                        extensions = g_slist_append(extensions, "");
                        break;
                }
        }

        GSList *theme;
        // Stage 1: exact size match
        // the theme must have a higher priority than having an exact size match, so we will just use
        // the code that searches for the best size match (it will find the exact size match if one exists)
        /*
        for (theme = launcher->list_themes; theme; theme = g_slist_next(theme)) {
                GSList *dir;
                for (dir = ((IconTheme*)theme->data)->list_directories; dir; dir = g_slist_next(dir)) {
                        if (directory_matches_size((IconThemeDir*)dir->data, size)) {
                                GSList *base;
                                for (base = basenames; base; base = g_slist_next(base)) {
                                        GSList *ext;
                                        for (ext = extensions; ext; ext = g_slist_next(ext)) {
                                                char *base_name = (char*) base->data;
                                                char *theme_name = ((IconTheme*)theme->data)->name;
                                                char *dir_name = ((IconThemeDir*)dir->data)->name;
                                                char *extension = (char*) ext->data;
                                                char *file_name = malloc(strlen(base_name) + strlen(theme_name) +
                                                        strlen(dir_name) + strlen(icon_name) + strlen(extension) + 100);
                                                // filename = directory/$(themename)/subdirectory/iconname.extension
                                                sprintf(file_name, "%s/%s/%s/%s%s", base_name, theme_name, dir_name, icon_name, extension);
                                                //printf("found exact: %s\n", file_name);
                                                //printf("checking %s\n", file_name);
                                                if (g_file_test(file_name, G_FILE_TEST_EXISTS)) {
                                                        g_slist_free(basenames);
                                                        g_slist_free(extensions);
                                                        g_free(home_icons);
                                                        return file_name;
                                                } else {
                                                        free(file_name);
                                                        file_name = NULL;
                                                }
                                        }
                                }
                        }
                }
        }
        g_free (file_name);
        */

        // Stage 2: best size match
        // Contrary to the freedesktop spec, we are not choosing the closest icon in size, but the next larger icon
        // otherwise the quality is usually crap (for size 22, if you can choose 16 or 32, you're better with 32)
        // We do fallback to the closest size if we cannot find a larger or equal icon
        
        // These 3 variables are used for keeping the closest size match
        int minimal_size = INT_MAX;
        char *best_file_name = NULL;
        GSList *best_file_theme = NULL;
        
        // These 3 variables are used for keeping the next larger match
        int next_larger_size = -1;
        char *next_larger = NULL;
        GSList *next_larger_theme = NULL;
        
        for (theme = launcher->list_themes; theme; theme = g_slist_next(theme)) {
                GSList *dir;
                for (dir = ((IconTheme*)theme->data)->list_directories; dir; dir = g_slist_next(dir)) {
                        GSList *base;
                        for (base = basenames; base; base = g_slist_next(base)) {
                                GSList *ext;
                                for (ext = extensions; ext; ext = g_slist_next(ext)) {
                                        char *base_name = (char*) base->data;
                                        char *theme_name = ((IconTheme*)theme->data)->name;
                                        char *dir_name = ((IconThemeDir*)dir->data)->name;
                                        char *extension = (char*) ext->data;
                                        char *file_name = malloc(strlen(base_name) + strlen(theme_name) +
                                        strlen(dir_name) + strlen(icon_name) + strlen(extension) + 100);
                                        // filename = directory/$(themename)/subdirectory/iconname.extension
                                        sprintf(file_name, "%s/%s/%s/%s%s", base_name, theme_name, dir_name, icon_name, extension);
                                        if (g_file_test(file_name, G_FILE_TEST_EXISTS)) {
                                                //printf("found: %s\n", file_name);
                                                // Closest match
                                                if (directory_size_distance((IconThemeDir*)dir->data, size) < minimal_size && (!best_file_theme ? 1 : theme == best_file_theme)) {
                                                        if (best_file_name) {
                                                                free(best_file_name);
                                                                best_file_name = NULL;
                                                        }
                                                        best_file_name = strdup(file_name);
                                                        minimal_size = directory_size_distance((IconThemeDir*)dir->data, size);
                                                        best_file_theme = theme;
                                                        //printf("best_file_name = %s; minimal_size = %d\n", best_file_name, minimal_size);
                                                }
                                                // Next larger match
                                                if (((IconThemeDir*)dir->data)->size >= size &&
                                                        (next_larger_size == -1 || ((IconThemeDir*)dir->data)->size < next_larger_size) &&
                                                        (!next_larger_theme ? 1 : theme == next_larger_theme)) {
                                                        if (next_larger) {
                                                                free(next_larger);
                                                                next_larger = NULL;
                                                        }
                                                        next_larger = strdup(file_name);
                                                        next_larger_size = ((IconThemeDir*)dir->data)->size;
                                                        next_larger_theme = theme;
                                                        //printf("next_larger = %s; next_larger_size = %d\n", next_larger, next_larger_size);
                                                }
                                        }
                                        free(file_name);
                                }
                        }
                }
        }
        if (next_larger) {
                g_slist_free(basenames);
                g_slist_free(extensions);
                free(best_file_name);
                g_free(home_icons);
                return next_larger;
        }
        if (best_file_name) {
                g_slist_free(basenames);
                g_slist_free(extensions);
                g_free(home_icons);
                return best_file_name;
        }

        // Stage 3: look in unthemed icons
        {
                GSList *base;
                for (base = basenames; base; base = g_slist_next(base)) {
                        GSList *ext;
                        for (ext = extensions; ext; ext = g_slist_next(ext)) {
                                char *base_name = (char*) base->data;
                                char *extension = (char*) ext->data;
                                char *file_name = malloc(strlen(base_name) + strlen(icon_name) +
                                        strlen(extension) + 100);
                                // filename = directory/iconname.extension
                                sprintf(file_name, "%s/%s%s", base_name, icon_name, extension);
                                //printf("checking %s\n", file_name);
                                if (g_file_test(file_name, G_FILE_TEST_EXISTS)) {
                                        g_slist_free(basenames);
                                        g_slist_free(extensions);
                                        g_free(home_icons);
                                        return file_name;
                                } else {
                                        free(file_name);
                                        file_name = NULL;
                                }
                        }
                }
        }

        fprintf(stderr, "Could not find icon %s\n", icon_name);

        g_slist_free(basenames);
        g_slist_free(extensions);
        g_free(home_icons);
        return NULL;
}