Converted README to markdown

[rox-filer.git] / ROX-Filer / src / type.c

/*
 * ROX-Filer, filer for the ROX desktop project
 * Copyright (C) 2006, Thomas Leonard and others (see changelog for details).
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * 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., 59 Temple
 * Place, Suite 330, Boston, MA  02111-1307  USA
 */

/* type.c - code for dealing with filetypes */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <time.h>
#include <sys/param.h>
#include <fnmatch.h>
#include <sys/types.h>
#include <fcntl.h>

#ifdef WITH_GNOMEVFS
# include <libgnomevfs/gnome-vfs.h>
# include <libgnomevfs/gnome-vfs-mime.h>
# include <libgnomevfs/gnome-vfs-mime-handlers.h>
# include <libgnomevfs/gnome-vfs-application-registry.h>
#endif

#include "global.h"

#include "string.h"
#include "fscache.h"
#include "main.h"
#include "pixmaps.h"
#include "run.h"
#include "gui_support.h"
#include "choices.h"
#include "type.h"
#include "support.h"
#include "diritem.h"
#include "dnd.h"
#include "options.h"
#include "filer.h"
#include "action.h"             /* (for action_chmod) */
#include "xml.h"
#include "dropbox.h"
#include "xdgmime.h"
#include "xtypes.h"
#include "run.h"

#define TYPE_NS "http://www.freedesktop.org/standards/shared-mime-info"
enum {SET_MEDIA, SET_TYPE};

/* Colours for file types (same order as base types) */
static gchar *opt_type_colours[][2] = {
        {"display_err_colour",  "#ff0000"},
        {"display_unkn_colour", "#000000"},
        {"display_dir_colour",  "#000080"},
        {"display_pipe_colour", "#444444"},
        {"display_sock_colour", "#ff00ff"},
        {"display_file_colour", "#000000"},
        {"display_cdev_colour", "#000000"},
        {"display_bdev_colour", "#000000"},
        {"display_door_colour", "#ff00ff"},
        {"display_exec_colour", "#006000"},
        {"display_adir_colour", "#006000"}
};
#define NUM_TYPE_COLOURS\
                (sizeof(opt_type_colours) / sizeof(opt_type_colours[0]))

/* Parsed colours for file types */
static Option o_type_colours[NUM_TYPE_COLOURS];
static GdkColor type_colours[NUM_TYPE_COLOURS];

/* Static prototypes */
static void alloc_type_colours(void);
static void options_changed(void);
static char *get_action_save_path(GtkWidget *dialog);
static MIME_type *get_mime_type(const gchar *type_name, gboolean can_create);
static gboolean remove_handler_with_confirm(const guchar *path);
static void set_icon_theme(void);
static GList *build_icon_theme(Option *option, xmlNode *node, guchar *label);

/* Hash of all allocated MIME types, indexed by "media/subtype".
 * MIME_type structs are never freed; this table prevents memory leaks
 * when rereading the config files.
 */
static GHashTable *type_hash = NULL;

/* Most things on Unix are text files, so this is the default type */
MIME_type *text_plain;
MIME_type *inode_directory;
MIME_type *inode_mountpoint;
MIME_type *inode_pipe;
MIME_type *inode_socket;
MIME_type *inode_block_dev;
MIME_type *inode_char_dev;
MIME_type *application_executable;
MIME_type *application_octet_stream;
MIME_type *application_x_shellscript;
MIME_type *application_x_desktop;
MIME_type *inode_unknown;
MIME_type *inode_door;

static Option o_display_colour_types;
static Option o_icon_theme;

static GtkIconTheme *icon_theme = NULL;
static GtkIconTheme *rox_theme = NULL;
static GtkIconTheme *gnome_theme = NULL;

void type_init(void)
{
        int         i;

        icon_theme = gtk_icon_theme_new();
        
        type_hash = g_hash_table_new(g_str_hash, g_str_equal);

        text_plain = get_mime_type("text/plain", TRUE);
        inode_directory = get_mime_type("inode/directory", TRUE);
        inode_mountpoint = get_mime_type("inode/mount-point", TRUE);
        inode_pipe = get_mime_type("inode/fifo", TRUE);
        inode_socket = get_mime_type("inode/socket", TRUE);
        inode_block_dev = get_mime_type("inode/blockdevice", TRUE);
        inode_char_dev = get_mime_type("inode/chardevice", TRUE);
        application_executable = get_mime_type("application/x-executable", TRUE);
        application_octet_stream = get_mime_type("application/octet-stream", TRUE);
        application_x_shellscript = get_mime_type("application/x-shellscript", TRUE);
        application_x_desktop = get_mime_type("application/x-desktop", TRUE);
        application_x_desktop->executable = TRUE;
        inode_unknown = get_mime_type("inode/unknown", TRUE);
        inode_door = get_mime_type("inode/door", TRUE);

        option_add_string(&o_icon_theme, "icon_theme", "ROX");
        option_add_int(&o_display_colour_types, "display_colour_types", TRUE);
        option_register_widget("icon-theme-chooser", build_icon_theme);
        
        for (i = 0; i < NUM_TYPE_COLOURS; i++)
                option_add_string(&o_type_colours[i],
                                  opt_type_colours[i][0],
                                  opt_type_colours[i][1]);
        alloc_type_colours();

        set_icon_theme();

        option_add_notify(options_changed);
}

/* Read-load all the glob patterns.
 * Note: calls filer_update_all.
 */
void reread_mime_files(void)
{
        gtk_icon_theme_rescan_if_needed(icon_theme);

        xdg_mime_shutdown();

        filer_update_all();
}

/* Returns the MIME_type structure for the given type name. It is looked
 * up in type_hash and returned if found. If not found (and can_create is
 * TRUE) then a new MIME_type is made, added to type_hash and returned.
 * NULL is returned if type_name is not in type_hash and can_create is
 * FALSE, or if type_name does not contain a '/' character.
 */
static MIME_type *get_mime_type(const gchar *type_name, gboolean can_create)
{
        MIME_type *mtype;
        gchar *slash;

        mtype = g_hash_table_lookup(type_hash, type_name);
        if (mtype || !can_create)
                return mtype;

        slash = strchr(type_name, '/');
        if (slash == NULL)
        {
                g_warning("MIME type '%s' does not contain a '/' character!",
                          type_name);
                return NULL;
        }

        mtype = g_new(MIME_type, 1);
        mtype->media_type = g_strndup(type_name, slash - type_name);
        mtype->subtype = g_strdup(slash + 1);
        mtype->image = NULL;
        mtype->comment = NULL;

        mtype->executable = xdg_mime_mime_type_subclass(type_name,
                                                "application/x-executable");

        g_hash_table_insert(type_hash, g_strdup(type_name), mtype);

        return mtype;
}

const char *basetype_name(DirItem *item)
{
        if (item->flags & ITEM_FLAG_SYMLINK)
                return _("Sym link");
        else if (item->flags & ITEM_FLAG_MOUNT_POINT)
                return _("Mount point");
        else if (item->flags & ITEM_FLAG_APPDIR)
                return _("App dir");

        switch (item->base_type)
        {
                case TYPE_FILE:
                        return _("File");
                case TYPE_DIRECTORY:
                        return _("Dir");
                case TYPE_CHAR_DEVICE:
                        return _("Char dev");
                case TYPE_BLOCK_DEVICE:
                        return _("Block dev");
                case TYPE_PIPE:
                        return _("Pipe");
                case TYPE_SOCKET:
                        return _("Socket");
                case TYPE_DOOR:
                        return _("Door");
        }
        
        return _("Unknown");
}

struct mime_list {
        GList *list;
        gboolean only_regular;
};

static void append_names(gpointer key, gpointer value, gpointer udata)
{
        struct mime_list *mlist = (struct mime_list*) udata;

        if(!mlist->only_regular || strncmp((char *)key, "inode/", 6)!=0)
                mlist->list = g_list_prepend(mlist->list, key);
}

/* Return list of all mime type names. Caller must free the list
 * but NOT the strings it contains (which are never freed).
 If only_regular is true then inode types are excluded.
 */
GList *mime_type_name_list(gboolean only_regular)
{
        struct mime_list list;

        list.list=NULL;
        list.only_regular=only_regular;
                
        g_hash_table_foreach(type_hash, append_names, &list);
        list.list = g_list_sort(list.list, (GCompareFunc) strcmp);

        return list.list;
}

/*                      MIME-type guessing                      */

/* Get the type of this file - stats the file and uses that if
 * possible. For regular or missing files, uses the pathname.
 */
MIME_type *type_get_type(const guchar *path)
{
        DirItem         *item;
        MIME_type       *type = NULL;

        item = diritem_new("");
        diritem_restat(path, item, NULL);
        if (item->base_type != TYPE_ERROR)
                type = item->mime_type;
        diritem_free(item);

        if (type)
                return type;

        type = type_from_path(path);

        if (!type)
                return text_plain;

        return type;
}

/* Returns a pointer to the MIME-type.
 *
 * Tries all enabled methods:
 * - Look for extended attribute
 * - If no attribute, check file name
 * - If no name rule, check contents
 *
 * NULL if we can't think of anything.
 */
MIME_type *type_from_path(const char *path)
{
        MIME_type *mime_type = NULL;
        const char *type_name;

        /* Check for extended attribute first */
        mime_type = xtype_get(path);
        if (mime_type)
                return mime_type;

        /* Try name and contents next */
        type_name = xdg_mime_get_mime_type_for_file(path, NULL);
        if (type_name)
                return get_mime_type(type_name, TRUE);

        return NULL;
}

/* Returns the file/dir in Choices for handling this type.
 * NULL if there isn't one. g_free() the result.
 */
char *handler_for(MIME_type *type)
{
        char    *type_name;
        char    *open;
        char    *target;

        type_name = g_strconcat(type->media_type, "_", type->subtype, NULL);
        open = choices_find_xdg_path_load(type_name, "MIME-types", SITE);
        g_free(type_name);

        if (!open)
                open = choices_find_xdg_path_load(type->media_type,
                                                  "MIME-types", SITE);

        if (!open)
                return NULL;

        /* Some programs behave differently depending on the command
         * name (e.g., 'vim' vs 'gvim'), so symlinks need to be followed here.
         */
        target = readlink_dup(open);
        if (!target)
        {
                return open;
        }

        if (target[0] == '/')
        {
                /* Absolute path */
                g_free(open);
                return target;
        }
        else
        {
                /* Relative path (shouldn't normally be needed) */
                gchar *dir;
                char *abs_path;

                dir = g_path_get_dirname(open);
                g_free(open);

                abs_path = g_strconcat(dir, "/", target, NULL);
                g_free(target);
                g_free(dir);

                return abs_path;
        }
}

MIME_type *mime_type_lookup(const char *type)
{
        return get_mime_type(type, TRUE);
}

static void init_aux_theme(GtkIconTheme **ptheme, const char *name)
{
        if (*ptheme)
                return;
        *ptheme = gtk_icon_theme_new();
        gtk_icon_theme_set_custom_theme(*ptheme, name);
}

inline static void init_rox_theme(void)
{
        init_aux_theme(&rox_theme, "ROX");
}

inline static void init_gnome_theme(void)
{
        init_aux_theme(&gnome_theme, "gnome");
}

/* We don't want ROX to override configured theme so try all possibilities
 * in icon_theme first */
static GtkIconInfo *mime_type_lookup_icon_info(GtkIconTheme *theme,
                MIME_type *type)
{
        char *type_name = g_strconcat(type->media_type, "-", type->subtype, NULL);
        GtkIconInfo *full = gtk_icon_theme_lookup_icon(theme, type_name, HUGE_HEIGHT, 0);

        g_free(type_name);
        if (!full)
        {
                /* Ugly hack... try for a GNOME icon */
                if (type == inode_directory)
                        type_name = g_strdup("gnome-fs-directory");
                else
                        type_name = g_strconcat("gnome-mime-", type->media_type,
                                        "-", type->subtype, NULL);
                full = gtk_icon_theme_lookup_icon(theme, type_name, HUGE_HEIGHT, 0);
                g_free(type_name);
        }
        if (!full)
        {
                /* Try for a media type */
                type_name = g_strconcat(type->media_type, "-x-generic", NULL);
                full = gtk_icon_theme_lookup_icon(theme, type_name, HUGE_HEIGHT, 0);
                g_free(type_name);
        }
        if (!full)
        {
                /* Ugly hack... try for a GNOME default media icon */
                type_name = g_strconcat("gnome-mime-", type->media_type, NULL);

                full = gtk_icon_theme_lookup_icon(theme, type_name, HUGE_HEIGHT, 0);
                g_free(type_name);
        }
        return full;
}

/*                      Actions for types                       */

/* Return the image for this type, loading it if needed.
 * Places to check are: (eg type="text_plain", base="text")
 * 1. <Choices>/MIME-icons/base_subtype
 * 2. Icon theme 'mime-base:subtype'
 * 3. Icon theme 'mime-base'
 * 4. Unknown type icon.
 *
 * Special case: If an icon cannot be found for inode/mount-point, the icon for
 * inode/directory will be returned (if possible).
 *
 * Note: You must g_object_unref() the image afterwards.
 */
MaskedPixmap *type_to_icon(MIME_type *type)
{
        GtkIconInfo *full;
        char    *type_name, *path;
        time_t  now;

        if (type == NULL)
        {
                g_object_ref(im_unknown);
                return im_unknown;
        }

        now = time(NULL);
        /* Already got an image? */
        if (type->image)
        {
                /* Yes - don't recheck too often */
                if (abs(now - type->image_time) < 2)
                {
                        g_object_ref(type->image);
                        return type->image;
                }
                g_object_unref(type->image);
                type->image = NULL;
        }

again:
        type_name = g_strconcat(type->media_type, "_", type->subtype,
                                ".png", NULL);
        path = choices_find_xdg_path_load(type_name, "MIME-icons", SITE);
        g_free(type_name);
        if (path)
        {
                type->image = g_fscache_lookup(pixmap_cache, path);
                g_free(path);
        }

        if (type->image)
                goto out;

        full = mime_type_lookup_icon_info(icon_theme, type);
        if (!full && icon_theme != rox_theme)
        {
                init_rox_theme();
                full = mime_type_lookup_icon_info(rox_theme, type);
        }
        if (!full && icon_theme != gnome_theme)
        {
                init_gnome_theme();
                full = mime_type_lookup_icon_info(gnome_theme, type);
        }
        if (!full && type == inode_mountpoint)
        {
                /* Try to use the inode/directory icon for inode/mount-point */
                type = inode_directory;
                goto again;
        }
        if (full)
        {
                const char *icon_path;
                /* Get the actual icon through our cache, not through GTK, because
                 * GTK doesn't cache icons.
                 */
                icon_path = gtk_icon_info_get_filename(full);
                if (icon_path != NULL)
                        type->image = g_fscache_lookup(pixmap_cache, icon_path);
                /* else shouldn't happen, because we didn't use
                 * GTK_ICON_LOOKUP_USE_BUILTIN.
                 */
                gtk_icon_info_free(full);
        }

out:
        if (!type->image)
        {
                /* One ref from the type structure, one returned */
                type->image = im_unknown;
                g_object_ref(im_unknown);
        }

        type->image_time = now;
        
        g_object_ref(type->image);
        return type->image;
}

GdkAtom type_to_atom(MIME_type *type)
{
        char    *str;
        GdkAtom retval;
        
        g_return_val_if_fail(type != NULL, GDK_NONE);

        str = g_strconcat(type->media_type, "/", type->subtype, NULL);
        retval = gdk_atom_intern(str, FALSE);
        g_free(str);
        
        return retval;
}

static void show_shell_help(gpointer data)
{
        info_message(_("Enter a shell command which will load \"$@\" into "
                        "a suitable program. Eg:\n\n"
                        "gimp \"$@\""));
}

/* Called if the user clicks on the OK button. Returns FALSE if an error
 * was displayed instead of performing the action.
 */
static gboolean set_shell_action(GtkWidget *dialog)
{
        GtkEntry *entry;
        const guchar *command;
        gchar   *tmp, *path;
        int     error = 0, len;
        int     fd;

        entry = g_object_get_data(G_OBJECT(dialog), "shell_command");

        g_return_val_if_fail(entry != NULL, FALSE);

        command = gtk_entry_get_text(entry);
        
        if (!strchr(command, '$'))
        {
                show_shell_help(NULL);
                return FALSE;
        }

        path = get_action_save_path(dialog);
        if (!path)
                return FALSE;
                
        tmp = g_strdup_printf("#! /bin/sh\nexec %s\n", command);
        len = strlen(tmp);
        
        fd = open(path, O_CREAT | O_WRONLY, 0755);
        if (fd == -1)
                error = errno;
        else
        {
                FILE *file;

                file = fdopen(fd, "w");
                if (file)
                {
                        if (fwrite(tmp, 1, len, file) < len)
                                error = errno;
                        if (fclose(file) && error == 0)
                                error = errno;
                }
                else
                        error = errno;
        }

        if (error)
                report_error(g_strerror(error));

        g_free(tmp);
        g_free(path);

        gtk_widget_destroy(dialog);

        return TRUE;
}

static void set_action_response(GtkWidget *dialog, gint response, gpointer data)
{
        if (response == GTK_RESPONSE_OK)
                if (!set_shell_action(dialog))
                        return;
        gtk_widget_destroy(dialog);
}

/* Return the path of the file in choices that handles this type and
 * radio setting.
 * NULL if nothing is defined for it.
 */
static guchar *handler_for_radios(GObject *dialog)
{
        Radios  *radios;
        MIME_type *type;

        radios = g_object_get_data(G_OBJECT(dialog), "rox-radios");
        type = g_object_get_data(G_OBJECT(dialog), "mime_type");
        
        g_return_val_if_fail(radios != NULL, NULL);
        g_return_val_if_fail(type != NULL, NULL);
        
        switch (radios_get_value(radios))
        {
                case SET_MEDIA:
                        return choices_find_xdg_path_load(type->media_type,
                                                          "MIME-types", SITE);
                case SET_TYPE:
                {
                        gchar *tmp, *handler;
                        tmp = g_strconcat(type->media_type, "_",
                                          type->subtype, NULL);
                        handler = choices_find_xdg_path_load(tmp,
                                                             "MIME-types",
                                                             SITE);
                        g_free(tmp);
                        return handler;
                }
                default:
                        g_warning("Bad type");
                        return NULL;
        }
}

/* (radios can be NULL if called from clear_run_action) */
static void run_action_update(Radios *radios, gpointer data)
{
        guchar *handler;
        DropBox *drop_box;
        GObject *dialog = G_OBJECT(data);

        drop_box = g_object_get_data(dialog, "rox-dropbox");

        g_return_if_fail(drop_box != NULL);

        handler = handler_for_radios(dialog);

        if (handler)
        {
                char *old = handler;

                handler = readlink_dup(old);
                if (handler)
                        g_free(old);
                else
                        handler = old;
        }

        drop_box_set_path(DROP_BOX(drop_box), handler);
        g_free(handler);
}

static void clear_run_action(GtkWidget *drop_box, GtkWidget *dialog)
{
        guchar *handler;

        handler = handler_for_radios(G_OBJECT(dialog));

        if (handler)
                remove_handler_with_confirm(handler);

        run_action_update(NULL, dialog);
}

/* Called when a URI list is dropped onto the box in the Set Run Action
 * dialog. Make sure it's an application, and make that the default
 * handler.
 */
static void drag_app_dropped(GtkWidget  *drop_box,
                             const guchar *app,
                             GtkWidget  *dialog)
{
        DirItem *item;

        item = diritem_new("");
        diritem_restat(app, item, NULL);
        if (item->flags & ITEM_FLAG_APPDIR || EXECUTABLE_FILE(item))
        {
                guchar  *path;

                path = get_action_save_path(dialog);

                if (path)
                {
                        if (symlink(app, path))
                                delayed_error("symlink: %s",
                                                g_strerror(errno));
                        else
                                destroy_on_idle(dialog);

                        g_free(path);
                }
        }
        else
                delayed_error(
                        _("This is not a program! Give me an application "
                        "instead!"));

        diritem_free(item);
}

/* Find the current command which is used to run files of this type.
 * Returns NULL on failure. g_free() the result.
 */
static guchar *get_current_command(MIME_type *type)
{
        struct stat     info;
        char *handler, *nl, *data = NULL;
        long len;
        guchar *command = NULL;

        handler = handler_for(type);

        if (!handler)
                return NULL;            /* No current handler */

        if (stat(handler, &info))
                goto out;               /* Can't stat */

        if ((!S_ISREG(info.st_mode)) || info.st_size > 256)
                goto out;               /* Only use small regular files */
        
        if (!load_file(handler, &data, &len))
                goto out;               /* Didn't load OK */

        if (strncmp(data, "#! /bin/sh\nexec ", 16) != 0)
                goto out;               /* Not one of ours */

        nl = strchr(data + 16, '\n');
        if (!nl)
                goto out;               /* No newline! */

        command = g_strndup(data + 16, nl - data - 16);
out:
        g_free(handler);
        g_free(data);
        return command;
}

/* Find the current command which is used to run files of this type,
 * and return a textual description of it.
 * Only call for non-executable files.
 * g_free() the result.
 */
gchar *describe_current_command(MIME_type *type)
{
        char *handler;
        char *desc = NULL;
        struct stat info;

        g_return_val_if_fail(type != NULL, NULL);

        handler = handler_for(type);

        if (!handler)
                return g_strdup(_("No run action defined"));

        if (mc_stat(handler, &info) !=0 )
        {
                desc = g_strdup_printf(_("Error in handler %s: %s"), handler,
                                        g_strerror(errno));
                goto out;
        }

        if (S_ISDIR(info.st_mode))
        {
                const guchar *tmp;
                uid_t dir_uid = info.st_uid;

                tmp = make_path(handler, "AppRun");

                if (mc_lstat(tmp, &info) != 0 || info.st_uid != dir_uid
                        || !(info.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
                        desc = g_strdup_printf(
                                _("Invalid application %s (bad AppRun)"),
                                handler);
                /* Else, just report handler... */

                goto out;
        }

        /* It's not an application directory, and it's not a symlink... */

        if (access(handler, X_OK) != 0)
        {
                desc = g_strdup_printf(_("Non-executable %s"), handler);
                goto out;
        }

        desc = get_current_command(type);
out:
        if (!desc)
                desc = handler;
        else
                g_free(handler);

        return desc;
}

/* Display a dialog box allowing the user to set the default run action
 * for this type.
 */
void type_set_handler_dialog(MIME_type *type)
{
        guchar          *tmp;
        GtkDialog       *dialog;
        GtkWidget       *frame, *entry, *label, *button;
        GtkWidget       *hbox;
        Radios          *radios;

        g_return_if_fail(type != NULL);

        dialog = GTK_DIALOG(gtk_dialog_new());
        gtk_dialog_set_has_separator(dialog, FALSE);
        gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_MOUSE);

        g_object_set_data(G_OBJECT(dialog), "mime_type", type);

        gtk_window_set_title(GTK_WINDOW(dialog), _("Set run action"));

        radios = radios_new(run_action_update, dialog);
        g_object_set_data(G_OBJECT(dialog), "rox-radios", radios);

        radios_add(radios,
                        _("If a handler for the specific type isn't set up, "
                          "use this as the default."), SET_MEDIA,
                        _("Set default for all `%s/<anything>'"),
                        type->media_type);
        
        radios_add(radios,
                        _("Use this application for all files with this MIME "
                          "type."), SET_TYPE,
                        _("Only for the type `%s' (%s/%s)"),
                        mime_type_comment(type),
                        type->media_type, type->subtype);

        radios_set_value(radios, SET_TYPE);

        frame = drop_box_new(_("Drop a suitable application here"));

        g_object_set_data(G_OBJECT(dialog), "rox-dropbox", frame);
        
        radios_pack(radios, GTK_BOX(dialog->vbox));
        gtk_box_pack_start(GTK_BOX(dialog->vbox), frame, TRUE, TRUE, 0);

        g_signal_connect(frame, "path_dropped",
                        G_CALLBACK(drag_app_dropped), dialog);
        g_signal_connect(frame, "clear",
                        G_CALLBACK(clear_run_action), dialog);

        hbox = gtk_hbox_new(FALSE, 4);
        gtk_box_pack_start(GTK_BOX(dialog->vbox), hbox, FALSE, TRUE, 4);
        gtk_box_pack_start(GTK_BOX(hbox), gtk_hseparator_new(), TRUE, TRUE, 0);
        gtk_box_pack_start(GTK_BOX(hbox), gtk_label_new(_("OR")),
                                                FALSE, TRUE, 0);
        gtk_box_pack_start(GTK_BOX(hbox), gtk_hseparator_new(), TRUE, TRUE, 0);

        hbox = gtk_hbox_new(FALSE, 4);
        gtk_box_pack_start(GTK_BOX(dialog->vbox), hbox, FALSE, TRUE, 0);

        label = gtk_label_new(_("Enter a shell command:")),
        gtk_misc_set_alignment(GTK_MISC(label), 0, .5);
        gtk_box_pack_start(GTK_BOX(hbox), label, TRUE, TRUE, 4);

        gtk_box_pack_start(GTK_BOX(hbox),
                        new_help_button(show_shell_help, NULL), FALSE, TRUE, 0);

        entry = gtk_entry_new();
        gtk_box_pack_start(GTK_BOX(dialog->vbox), entry, FALSE, TRUE, 0);
        gtk_widget_grab_focus(entry);
        g_object_set_data(G_OBJECT(dialog), "shell_command", entry);
        gtk_entry_set_activates_default(GTK_ENTRY(entry), TRUE);

        /* If possible, fill in the entry box with the current command */
        tmp = get_current_command(type);
        if (tmp)
        {
                gtk_entry_set_text(GTK_ENTRY(entry), tmp);
                gtk_editable_set_position(GTK_EDITABLE(entry), -1);
                g_free(tmp);
        }
        else
        {
                gtk_entry_set_text(GTK_ENTRY(entry), " \"$@\"");
                gtk_editable_set_position(GTK_EDITABLE(entry), 0);
        }

        gtk_dialog_add_button(dialog, GTK_STOCK_CLOSE, GTK_RESPONSE_CANCEL);

        button = button_new_mixed(GTK_STOCK_OK, _("_Use Command"));
        GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
        gtk_dialog_add_action_widget(dialog, button, GTK_RESPONSE_OK);

        hbox = gtk_hbox_new(TRUE, 4);
        gtk_box_pack_start(GTK_BOX(dialog->vbox), hbox, FALSE, TRUE, 0);

        gtk_dialog_set_default_response(dialog, GTK_RESPONSE_OK);
        
        g_signal_connect(dialog, "response",
                        G_CALLBACK(set_action_response), NULL);

        gtk_widget_show_all(GTK_WIDGET(dialog));
}

/* path is an entry in Choices. If it's a symlink or a very small executable
 * then just get rid of it, otherwise confirm first. It it doesn't exist,
 * do nothing.
 *
 * FALSE on error (abort operation).
 */
static gboolean remove_handler_with_confirm(const guchar *path)
{
        struct stat info;

        if (lstat(path, &info) == 0)
        {
                /* A binding already exists... */
                if (S_ISREG(info.st_mode) && info.st_size > 256)
                {
                        if (!confirm(_("A run action already exists and is "
                                      "quite a big program - are you sure "
                                      "you want to delete it?"),
                                    GTK_STOCK_DELETE, NULL))
                        {
                                return FALSE;
                        }
                }
                
                if (unlink(path))
                {
                        report_error(_("Can't remove %s: %s"),
                                path, g_strerror(errno));
                        return FALSE;
                }
        }

        return TRUE;
}

/* The user wants to set a new default action for files of this type (or just
 * clear the action). Removes the current binding if possible and returns the
 * path to save the new one to. NULL means cancel. g_free() the result.
 */
static char *get_action_save_path(GtkWidget *dialog)
{
        guchar          *path = NULL;
        guchar          *type_name = NULL;
        MIME_type       *type;
        Radios          *radios;

        g_return_val_if_fail(dialog != NULL, NULL);

        type = g_object_get_data(G_OBJECT(dialog), "mime_type");
        radios = g_object_get_data(G_OBJECT(dialog), "rox-radios");

        g_return_val_if_fail(radios != NULL && type != NULL, NULL);

        if (radios_get_value(radios) == SET_MEDIA)
                type_name = g_strdup(type->media_type);
        else
                type_name = g_strconcat(type->media_type, "_",
                                type->subtype, NULL);

        path = choices_find_xdg_path_save("", PROJECT, SITE, FALSE);
        if (!path)
        {
                report_error(
                _("Choices saving is disabled by CHOICESPATH variable"));
                goto out;
        }
        g_free(path);

        path = choices_find_xdg_path_save(type_name, "MIME-types", SITE, TRUE);

        if (!remove_handler_with_confirm(path))
                null_g_free(&path);
out:
        g_free(type_name);
        return path;
}

MIME_type *mime_type_from_base_type(int base_type)
{
        switch (base_type)
        {
                case TYPE_FILE:
                        return text_plain;
                case TYPE_DIRECTORY:
                        return inode_directory;
                case TYPE_PIPE:
                        return inode_pipe;
                case TYPE_SOCKET:
                        return inode_socket;
                case TYPE_BLOCK_DEVICE:
                        return inode_block_dev;
                case TYPE_CHAR_DEVICE:
                        return inode_char_dev;
                case TYPE_DOOR:
                        return inode_door;
        }
        return inode_unknown;
}

/* Takes the st_mode field from stat() and returns the base type.
 * Should not be a symlink.
 */
int mode_to_base_type(int st_mode)
{
        if (S_ISREG(st_mode))
                return TYPE_FILE;
        else if (S_ISDIR(st_mode))
                return TYPE_DIRECTORY;
        else if (S_ISBLK(st_mode))
                return TYPE_BLOCK_DEVICE;
        else if (S_ISCHR(st_mode))
                return TYPE_CHAR_DEVICE;
        else if (S_ISFIFO(st_mode))
                return TYPE_PIPE;
        else if (S_ISSOCK(st_mode))
                return TYPE_SOCKET;
        else if (S_ISDOOR(st_mode))
                return TYPE_DOOR;

        return TYPE_ERROR;
}

/* Returns TRUE is this is something that is run by looking up its type
 * in MIME-types and, hence, can have its run action set.
 */
gboolean can_set_run_action(DirItem *item)
{
        g_return_val_if_fail(item != NULL, FALSE);

        return item->base_type == TYPE_FILE && !EXECUTABLE_FILE(item);
}

/* Parse file type colours and allocate/free them as necessary */
static void alloc_type_colours(void)
{
        gboolean        success[NUM_TYPE_COLOURS];
        int             change_count = 0;       /* No. needing realloc */
        int             i;
        static gboolean allocated = FALSE;

        /* Parse colours */
        for (i = 0; i < NUM_TYPE_COLOURS; i++)
        {
                GdkColor *c = &type_colours[i];
                gushort r = c->red;
                gushort g = c->green;
                gushort b = c->blue;

                gdk_color_parse(o_type_colours[i].value, &type_colours[i]);

                if (allocated && (c->red != r || c->green != g || c->blue != b))
                        change_count++;
        }
        
        /* Free colours if they were previously allocated and
         * have changed or become unneeded.
         */
        if (allocated && (change_count || !o_display_colour_types.int_value))
        {
                gdk_colormap_free_colors(gdk_rgb_get_colormap(),
                                         type_colours, NUM_TYPE_COLOURS);
                allocated = FALSE;
        }

        /* Allocate colours, unless they are still allocated (=> they didn't
         * change) or we don't want them anymore.
         * XXX: what should be done if allocation fails?
         */
        if (!allocated && o_display_colour_types.int_value)
        {
                gdk_colormap_alloc_colors(gdk_rgb_get_colormap(),
                                type_colours, NUM_TYPE_COLOURS,
                                FALSE, TRUE, success);
                allocated = TRUE;
        }
}

static void expire_timer(gpointer key, gpointer value, gpointer data)
{
        MIME_type *type = value;

        type->image_time = 0;
}

static void options_changed(void)
{
        alloc_type_colours();
        if (o_icon_theme.has_changed)
        {
                set_icon_theme();
                g_hash_table_foreach(type_hash, expire_timer, NULL);
                full_refresh();
        }
}

/* Return a pointer to a (static) colour for this item. If colouring is
 * off, returns normal.
 */
GdkColor *type_get_colour(DirItem *item, GdkColor *normal)
{
        int type = item->base_type;

        if (!o_display_colour_types.int_value)
                return normal;

        if (EXECUTABLE_FILE(item))
                type = TYPE_EXEC;
        else if (item->flags & ITEM_FLAG_APPDIR)
                type = TYPE_APPDIR;

        g_return_val_if_fail(type >= 0 && type < NUM_TYPE_COLOURS, normal);

        return &type_colours[type];
}

static char **get_xdg_data_dirs(int *n_dirs)
{
        const char *env;
        char **dirs;
        int i, n;

        env = getenv("XDG_DATA_DIRS");
        if (!env)
                env = "/usr/local/share/:/usr/share/";
        dirs = g_strsplit(env, ":", 0);
        g_return_val_if_fail(dirs != NULL, NULL);
        for (n = 0; dirs[n]; n++)
                ;
        for (i = n; i > 0; i--)
                dirs[i] = dirs[i - 1];
        env = getenv("XDG_DATA_HOME");
        if (env)
                dirs[0] = g_strdup(env);
        else
                dirs[0] = g_build_filename(g_get_home_dir(), ".local",
                                           "share", NULL);
        *n_dirs = n + 1;
        return dirs;
}

/* Try to fill in 'type->comment' from this document */
static void get_comment(MIME_type *type, const guchar *path)
{
        xmlNode *node;
        XMLwrapper *doc;
        
        doc = xml_cache_load(path);
        if (!doc)
                return;

        node = xml_get_section(doc, TYPE_NS, "comment");

        if (node)
        {
                char *val;
                g_return_if_fail(type->comment == NULL);
                val= xmlNodeListGetString(node->doc, node->xmlChildrenNode, 1);
                type->comment = g_strdup(val);
                xmlFree(val);
        }

        g_object_unref(doc);
}

/* Fill in the comment field for this MIME type */
static void find_comment(MIME_type *type)
{
        char **dirs;
        int i, n_dirs = 0;

        if (type->comment)
        {
                g_free(type->comment);
                type->comment = NULL;
        }

        dirs = get_xdg_data_dirs(&n_dirs);
        g_return_if_fail(dirs != NULL);

        for (i = 0; i < n_dirs; i++)
        {
                guchar *path;
                
                path = g_strdup_printf("%s/mime/%s/%s.xml", dirs[i],
                                type->media_type, type->subtype);
                get_comment(type, path);
                g_free(path);
                if (type->comment)
                        break;
        }

        if (!type->comment)
                type->comment = g_strdup_printf("%s/%s", type->media_type,
                                                type->subtype);

        for (i = 0; i < n_dirs; i++)
                g_free(dirs[i]);
        g_free(dirs);
}

const char *mime_type_comment(MIME_type *type)
{
        if (!type->comment)
                find_comment(type);

        return type->comment;
}

static void unref_icon_theme(void)
{
        if (icon_theme && icon_theme != rox_theme && icon_theme != gnome_theme)
                g_object_unref(icon_theme);
}

static void set_icon_theme(void)
{
        struct stat info;
        char *icon_home;
        const char *theme_dir;
        const char *theme_name = o_icon_theme.value;

        if (!theme_name || !*theme_name)
                theme_name = "ROX";

        if (!strcmp(theme_name, "ROX"))
        {
                unref_icon_theme();
                init_rox_theme();
                icon_theme = rox_theme;
        }
        else if (!strcmp(theme_name, "gnome"))
        {
                unref_icon_theme();
                init_gnome_theme();
                icon_theme = gnome_theme;
        }
        else
        {
                if (icon_theme == rox_theme || icon_theme == gnome_theme)
                        icon_theme = gtk_icon_theme_new();
                gtk_icon_theme_set_custom_theme(icon_theme, theme_name);
        }

        /* Ensure the ROX theme exists. */

        icon_home = g_build_filename(home_dir, ".icons", "ROX", NULL);
        if (stat(icon_home, &info) == 0)
                return; /* Already exists */

        /* First, create the .icons directory */
        theme_dir = make_path(home_dir, ".icons");
        if (!file_exists(theme_dir))
                mkdir(theme_dir, 0755);

        if (lstat(icon_home, &info) == 0)
        {
                /* Probably a broken symlink, then. Remove it. */
                if (unlink(icon_home))
                        g_warning("Error removing broken symlink %s: %s", icon_home, g_strerror(errno));
                else
                        g_warning("Removed broken symlink %s", icon_home);
        }

        if (symlink(make_path(app_dir, "ROX"), icon_home))
        {
                delayed_error(_("Failed to create symlink '%s':\n%s"), icon_home, g_strerror(errno));
                open_to_show(icon_home);
        }
        g_free(icon_home);

        gtk_icon_theme_rescan_if_needed(icon_theme);
}

static guchar *read_theme(Option *option)
{
        GtkOptionMenu *om = GTK_OPTION_MENU(option->widget);
        GtkLabel *item;

        item = GTK_LABEL(GTK_BIN(om)->child);

        g_return_val_if_fail(item != NULL, g_strdup("ROX"));

        return g_strdup(gtk_label_get_text(item));
}

static void update_theme(Option *option)
{
        GtkOptionMenu *om = GTK_OPTION_MENU(option->widget);
        GtkWidget *menu;
        GList *kids, *next;
        int i = 0;

        menu = gtk_option_menu_get_menu(om);

        kids = gtk_container_get_children(GTK_CONTAINER(menu));
        for (next = kids; next; next = next->next, i++)
        {
                GtkLabel *item = GTK_LABEL(GTK_BIN(next->data)->child);
                const gchar *label;

                /* The label actually moves from the menu!! */
                if (!item)
                        item = GTK_LABEL(GTK_BIN(om)->child);

                label = gtk_label_get_text(item);

                g_return_if_fail(label != NULL);

                if (strcmp(label, option->value) == 0)
                        break;
        }
        g_list_free(kids);
        
        if (next)
                gtk_option_menu_set_history(om, i);
        else
                g_warning("Theme '%s' not found", option->value);
}

static void add_themes_from_dir(GPtrArray *names, const char *dir)
{
        GPtrArray *list;
        int i;

        if (access(dir, F_OK) != 0)
                return;

        list = list_dir(dir);
        g_return_if_fail(list != NULL);

        for (i = 0; i < list->len; i++)
        {
                char *index_path;

                index_path = g_build_filename(dir, list->pdata[i],
                                                "index.theme", NULL);
                
                if (access(index_path, F_OK) == 0)
                        g_ptr_array_add(names, list->pdata[i]);
                else
                        g_free(list->pdata[i]);

                g_free(index_path);
        }

        g_ptr_array_free(list, TRUE);
}

static GList *build_icon_theme(Option *option, xmlNode *node, guchar *label)
{
        GtkWidget *button, *menu, *hbox;
        GPtrArray *names;
        gchar **theme_dirs = NULL;
        gint n_dirs = 0;
        int i;

        g_return_val_if_fail(option != NULL, NULL);
        g_return_val_if_fail(label != NULL, NULL);

        hbox = gtk_hbox_new(FALSE, 4);

        gtk_box_pack_start(GTK_BOX(hbox), gtk_label_new(_(label)),
                                FALSE, TRUE, 0);

        button = gtk_option_menu_new();
        gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, TRUE, 0);

        menu = gtk_menu_new();
        gtk_option_menu_set_menu(GTK_OPTION_MENU(button), menu);

        gtk_icon_theme_get_search_path(icon_theme, &theme_dirs, &n_dirs);
        names = g_ptr_array_new();
        for (i = 0; i < n_dirs; i++)
                add_themes_from_dir(names, theme_dirs[i]);
        g_strfreev(theme_dirs);

        g_ptr_array_sort(names, strcmp2);

        for (i = 0; i < names->len; i++)
        {
                GtkWidget *item;
                char *name = names->pdata[i];

                item = gtk_menu_item_new_with_label(name);
                gtk_menu_shell_append(GTK_MENU_SHELL(menu), item);
                gtk_widget_show_all(item);

                g_free(name);
        }

        g_ptr_array_free(names, TRUE);

        option->update_widget = update_theme;
        option->read_widget = read_theme;
        option->widget = button;

        gtk_signal_connect_object(GTK_OBJECT(button), "changed",
                        GTK_SIGNAL_FUNC(option_check_widget),
                        (GtkObject *) option);

        return g_list_append(NULL, hbox);
}

GtkIconInfo *theme_lookup_icon(const gchar *icon_name, gint size,
                GtkIconLookupFlags flags)
{
        GtkIconInfo *result = gtk_icon_theme_lookup_icon(icon_theme,
                        icon_name, size, flags);

        if (!result && icon_theme != rox_theme)
        {
                init_rox_theme();
                result = gtk_icon_theme_lookup_icon(rox_theme,
                        icon_name, size, flags);
        }
        if (!result && icon_theme != gnome_theme)
        {
                init_gnome_theme();
                result = gtk_icon_theme_lookup_icon(gnome_theme,
                        icon_name, size, flags);
        }
        return result;
}

GdkPixbuf *theme_load_icon(const gchar *icon_name, gint size,
                GtkIconLookupFlags flags, GError **perror)
{
        GdkPixbuf *result = gtk_icon_theme_load_icon(icon_theme,
                        icon_name, size, flags, NULL);

        if (!result && icon_theme != gnome_theme)
        {
                init_gnome_theme();
                result = gtk_icon_theme_load_icon(gnome_theme,
                        icon_name, size, flags, NULL);
        }
        if (!result && icon_theme != rox_theme)
        {
                init_rox_theme();
                result = gtk_icon_theme_load_icon(rox_theme,
                        icon_name, size, flags, perror);
        }
        return result;
}