r1221: Merged OptionUI into Option, since it's public now.

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

/*
 * $Id$
 *
 * ROX-Filer, filer for the ROX desktop project
 * Copyright (C) 2002, the ROX-Filer team.
 *
 * 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>

#ifdef HAVE_REGEX_H
# include <regex.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"

#ifdef HAVE_REGEX_H
# define USE_REGEX 1
#else
# undef USE_REGEX
#endif

#ifdef USE_REGEX
/* A regexp rule, which maps matching filenames to a MIME-types */
typedef struct pattern {
        MIME_type *type;
        regex_t buffer;
} Pattern;
#endif

/* 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_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 char *import_extensions(guchar *line);
static void import_for_dir(guchar *path);
char *get_action_save_path(GtkWidget *dialog);
static void edit_mime_types(guchar *unused);
static void reread_mime_files(guchar *unused);
static MIME_type *get_mime_type(const gchar *type_name, gboolean can_create);
static GList *build_type_reread(Option *none, xmlNode *node, guchar *label);
static GList *build_type_edit(Option *none, xmlNode *node, guchar *label);

/* Maps extensions to MIME_types (eg 'png'-> MIME_type *).
 * Extensions may contain dots; 'tar.gz' matches '*.tar.gz', etc.
 * The hash table is consulted from each dot in the string in turn
 * (First .ps.gz, then try .gz)
 */
static GHashTable *extension_hash = NULL;
static char *current_type = NULL;       /* (used while reading file) */
#ifdef USE_REGEX
static GList *patterns = NULL;          /* [(regexp -> MIME type)] */
#endif
/* 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 *special_directory;
MIME_type *special_pipe;
MIME_type *special_socket;
MIME_type *special_block_dev;
MIME_type *special_char_dev;
MIME_type *special_exec;
MIME_type *special_unknown;

static Option o_display_colour_types;

void type_init(void)
{
        int             i;
        GPtrArray       *list;
        
        extension_hash = g_hash_table_new(g_str_hash, g_str_equal);
        type_hash = g_hash_table_new(g_str_hash, g_str_equal);

        text_plain = get_mime_type("text/plain", TRUE);
        special_directory = get_mime_type("special/directory", TRUE);
        special_pipe = get_mime_type("special/pipe", TRUE);
        special_socket = get_mime_type("special/socket", TRUE);
        special_block_dev = get_mime_type("special/block-device", TRUE);
        special_char_dev = get_mime_type("special/char-device", TRUE);
        special_exec = get_mime_type("special/executable", TRUE);
        special_unknown = get_mime_type("special/unknown", TRUE);

        current_type = NULL;

        list = choices_list_dirs("MIME-info");
        for (i = list->len - 1; i >= 0; i--)
                import_for_dir((gchar *) g_ptr_array_index(list, i));
        choices_free_list(list);

        option_register_widget("type-edit", build_type_edit);
        option_register_widget("type-reread", build_type_reread);
        
        option_add_int(&o_display_colour_types, "display_colour_types", TRUE);
        
        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();

        option_add_notify(alloc_type_colours);
}

/* 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, '/');
        g_return_val_if_fail(slash != NULL, NULL);     /* XXX: Report nicely */

        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;

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

        return mtype;
}

#ifdef USE_REGEX
static void pattern_delete(gpointer patt, gpointer udata)
{
        Pattern *pattern = (Pattern *) patt;

        regfree(&pattern->buffer);

        g_free(pattern);
}
#endif

static gboolean extension_delete(gpointer key, gpointer value, gpointer udata)
{
        /* key is a g_strdup'ed string */
        g_free(key);

        /* value is also preserved in type_hash, so don't delete */

        return TRUE; /* Removes this entry */
}

/* XXX: Dup code */
void type_reread(void)
{
        GPtrArray       *list;
        int i;

        g_hash_table_foreach_remove(extension_hash, extension_delete, NULL);
#ifdef USE_REGEX
        g_list_foreach(patterns, pattern_delete, NULL);
        g_list_free(patterns);
        patterns = NULL;
#endif

        current_type = NULL;

        list = choices_list_dirs("MIME-info");
        for (i = list->len - 1; i >= 0; i--)
                import_for_dir((gchar *) g_ptr_array_index(list, i));
        choices_free_list(list);

        filer_update_all();
}

/* Parse every file in 'dir' */
static void import_for_dir(guchar *path)
{
        DIR             *dir;
        struct dirent   *item;

        dir = opendir(path);
        if (!dir)
                return;

        while ((item = readdir(dir)))
        {
                guchar  *file;
                struct stat info;
                
                if (item->d_name[0] == '.')
                        continue;

                current_type = NULL;
                file = make_path(path, item->d_name)->str;

                if (stat(file, &info) == 0 && S_ISREG(info.st_mode))
                        parse_file(file, import_extensions);
        }

        closedir(dir);
}

/* Add one entry to the extension_hash table */
static void add_ext(char *type_name, char *ext)
{
        MIME_type *new;

        new = get_mime_type(type_name, TRUE);
        
        g_return_if_fail(new != NULL);
                        
        g_hash_table_insert(extension_hash, g_strdup(ext), new);
}

static void add_regex(char *type_name, char *reg)
{
#ifdef USE_REGEX
        MIME_type *new;
        char      *slash;
        Pattern   *pattern;

        slash = strchr(type_name, '/');
        g_return_if_fail(slash != NULL);        /* XXX: Report nicely */

        pattern = g_new0(Pattern, 1);

        if (regcomp(&pattern->buffer, reg, REG_EXTENDED | REG_NOSUB))
        {
                regfree(&pattern->buffer);
                g_free(pattern);
                return;
        }
        
        new = get_mime_type(type_name, TRUE);
        
        g_return_if_fail(new != NULL);

        pattern->type = new;

        patterns = g_list_prepend(patterns, pattern);
#endif
}

/* Parse one line from the file and add entries to extension_hash */
static char *import_extensions(guchar *line)
{

        if (*line == '\0' || *line == '#')
                return NULL;            /* Comment */

        if (isspace(*line))
        {
                if (!current_type)
                        return _("Missing MIME-type");
                while (*line && isspace(*line))
                        line++;

                if (strncmp(line, "ext:", 4) == 0)
                {
                        char *ext;
                        line += 4;

                        for (;;)
                        {
                                while (*line && isspace(*line))
                                        line++;
                                if (*line == '\0')
                                        break;
                                ext = line;
                                while (*line && !isspace(*line))
                                        line++;
                                if (*line)
                                        *line++ = '\0';
                                add_ext(current_type, ext);
                        }
                }
                else if (strncmp(line, "regex:", 6) == 0)
                {
                        line += 6;

                        while (*line && isspace(*line))
                                line++;
                        if (*line)
                                add_regex(current_type, line);
                }
                /* else ignore */
        }
        else
        {
                char            *type = line;
                while (*line && *line != ':' && !isspace(*line))
                        line++;
                if (*line)
                        *line++ = '\0';
                while (*line && isspace(*line))
                        line++;
                if (*line)
                        return _("Trailing chars after MIME-type");
                current_type = g_strdup(type);
        }
        return NULL;
}

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");
        }
        
        return _("Unknown");
}

/*                      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(guchar *path)
{
        struct stat     info;
        MIME_type       *type = NULL;
        int             base = TYPE_FILE;
        gboolean        exec = FALSE;

        if (mc_stat(path, &info) == 0)
        {
                base = mode_to_base_type(info.st_mode);
                if (info.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
                        exec = TRUE;
        }

        if (base == TYPE_FILE)
                type = type_from_path(path);

        if (!type)
        {
                if (base == TYPE_FILE && exec)
                        type = special_exec;
                else
                        type = mime_type_from_base_type(base);
        }

        return type;
}

/* Returns a pointer to the MIME-type.
 * NULL if we can't think of anything.
 */
MIME_type *type_from_path(char *path)
{
        char    *ext, *dot, *lower, *leafname;
#ifdef USE_REGEX
        GList *patt;
        int len;
#endif

        leafname = strrchr(path, '/');
        if (!leafname)
                leafname = path;
        else
                leafname++;
        ext = leafname;

        while ((dot = strchr(ext, '.')))
        {
                MIME_type *type;

                ext = dot + 1;

                type = g_hash_table_lookup(extension_hash, ext);

                if (type)
                        return type;

                lower = g_strdup(ext);
                g_strdown(lower);
                type = g_hash_table_lookup(extension_hash, lower);
                g_free(lower);

                if (type)
                        return type;
        }

#ifdef USE_REGEX
        len = strlen(leafname);

        for (patt = patterns; patt; patt = patt->next)
        {
                Pattern *pattern = (Pattern *) patt->data;

                if (regexec(&pattern->buffer, leafname, 0, NULL, 0) == 0)
                        return pattern->type;
        }
#endif

        return NULL;
}

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

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

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

        return open;
}

/*                      Actions for types                       */

gboolean type_open(char *path, MIME_type *type)
{
        char    *argv[] = {NULL, NULL, NULL};
        char    *open;
        gboolean        retval;
        struct stat     info;

        argv[1] = path;

        open = handler_for(type);
        if (!open)
                return FALSE;

        if (stat(open, &info))
        {
                report_error("stat(%s): %s", open, g_strerror(errno));
                g_free(open);
                return FALSE;
        }

        if (S_ISDIR(info.st_mode))
                argv[0] = g_strconcat(open, "/AppRun", NULL);
        else
                argv[0] = open;

        retval = rox_spawn(home_dir, argv);

        if (argv[0] != open)
                g_free(argv[0]);

        g_free(open);
        
        return retval;
}

/* Return the image for this type, loading it if needed.
 * Places to check are: (eg type="text_plain", base="text")
 * 1. Choices:MIME-icons/<type>
 * 2. Choices:MIME-icons/<base>
 * 3. Unknown type icon.
 *
 * Note: You must pixmap_unref() the image afterwards.
 */
MaskedPixmap *type_to_icon(MIME_type *type)
{
        char    *path;
        char    *type_name;
        time_t  now;

        if (type == NULL)
        {
                pixmap_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)
                {
                        pixmap_ref(type->image);
                        return type->image;
                }
                pixmap_unref(type->image);
                type->image = NULL;
        }

        type_name = g_strconcat(type->media_type, "_",
                                type->subtype, ".xpm", NULL);
        path = choices_find_path_load(type_name, "MIME-icons");
        if (!path)
        {
                strcpy(type_name + strlen(type->media_type), ".xpm");
                path = choices_find_path_load(type_name, "MIME-icons");
        }
        
        g_free(type_name);

        if (path)
        {
                type->image = g_fscache_lookup(pixmap_cache, path);
                g_free(path);
        }

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

        type->image_time = now;
        
        pixmap_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;
}

void show_shell_help(gpointer data)
{
        report_error(_("Enter a shell command which will load \"$1\" into "
                        "a suitable program. Eg:\n\n"
                        "gimp \"$1\""));
}

/* Called if the user clicks on the OK button */
static void set_shell_action(GtkWidget *dialog)
{
        GtkEntry *entry;
        GtkToggleButton *for_all;
        guchar  *command, *path, *tmp;
        int     error = 0, len;
        FILE    *file;

        entry = gtk_object_get_data(GTK_OBJECT(dialog), "shell_command");
        for_all = gtk_object_get_data(GTK_OBJECT(dialog), "set_for_all");
        g_return_if_fail(entry != NULL);

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

        path = get_action_save_path(dialog);
        if (!path)
                return;
                
        tmp = g_strdup_printf("#! /bin/sh\nexec %s\n", command);
        len = strlen(tmp);
        
        file = fopen(path, "wb");
        if (fwrite(tmp, 1, len, file) < len)
                error = errno;
        if (fclose(file) && error == 0)
                error = errno;
        if (chmod(path, 0777))
                error = errno;

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

        g_free(tmp);
        g_free(path);

        gtk_widget_destroy(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.
 */
void drag_app_dropped(GtkWidget         *eb,
                      GdkDragContext    *context,
                      gint              x,
                      gint              y,
                      GtkSelectionData  *selection_data,
                      guint             info,
                      guint32           time,
                      GtkWidget         *dialog)
{
        GList   *uris;
        guchar  *app = NULL;
        DirItem *item;

        if (!selection_data->data)
                return;                 /* Timeout? */

        uris = uri_list_to_glist(selection_data->data);

        if (g_list_length(uris) == 1)
                app = get_local_path((guchar *) uris->data);
        g_list_free(uris);

        if (!app)
        {
                delayed_error(
                        _("You should drop a single (local) application "
                        "onto the drop box - that application will be "
                        "used to load files of this type in future"));
                return;
        }

        item = diritem_new(NULL);
        diritem_restat(app, item);
        if (item->flags & (ITEM_FLAG_APPDIR | ITEM_FLAG_EXEC_FILE))
        {
                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.
 * g_free() the result.
 */
gchar *describe_current_command(MIME_type *type)
{
        char *handler;
        char *desc = NULL;
        struct stat info;
        char *target;

        g_return_val_if_fail(type != NULL, NULL);

        if (type == special_exec)
                return g_strdup(_("Execute file"));

        handler = handler_for(type);

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

        target = readlink_dup(handler);
        if (target)
        {
                /* Cope with relative paths (shouldn't normally be needed) */

                if (target[0] == '/')
                {
                        g_free(handler);
                        handler = target;
                }
                else
                {
                        gchar *dir;

                        dir = g_dirname(handler);
                        g_free(handler);
                        handler = g_strconcat(dir, "/", target, NULL);
                        g_free(target);
                        g_free(dir);
                }
        }

        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))
        {
                gchar *tmp;
                uid_t dir_uid = info.st_uid;

                tmp = make_path(handler, "AppRun")->str;

                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;
        gchar           *handler;
        GtkWidget       *dialog, *vbox, *frame, *hbox, *entry, *label, *button;
        GtkWidget       *radio, *eb;
        GtkTargetEntry  targets[] = {
                {"text/uri-list", 0, TARGET_URI_LIST},
        };

        g_return_if_fail(type != NULL);

        dialog = gtk_window_new(GTK_WINDOW_DIALOG);
#ifdef GTK2
        gtk_window_set_type_hint(GTK_WINDOW(dialog),
                        GDK_WINDOW_TYPE_HINT_DIALOG);
#endif
        gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_MOUSE);
        gtk_object_set_data(GTK_OBJECT(dialog), "mime_type", type);

        gtk_window_set_title(GTK_WINDOW(dialog), _("Set run action"));
        gtk_container_set_border_width(GTK_CONTAINER(dialog), 10);

        vbox = gtk_vbox_new(FALSE, 4);
        gtk_container_add(GTK_CONTAINER(dialog), vbox);

        tmp = g_strdup_printf(_("Set default for all `%s/<anything>'"),
                                type->media_type);
        radio = gtk_radio_button_new_with_label(NULL, tmp);
        g_free(tmp);
        gtk_object_set_data(GTK_OBJECT(dialog), "set_for_all", radio);

        tmp = g_strdup_printf(_("Only for the type `%s/%s'"), type->media_type,
                        type->subtype);
        gtk_box_pack_start(GTK_BOX(vbox), radio, FALSE, TRUE, 0);
        radio = gtk_radio_button_new_with_label(
                        gtk_radio_button_group(GTK_RADIO_BUTTON(radio)),
                        tmp);
        g_free(tmp);
        gtk_box_pack_start(GTK_BOX(vbox), radio, FALSE, TRUE, 0);
        gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(radio), TRUE);

        frame = gtk_frame_new(NULL);
        gtk_box_pack_start(GTK_BOX(vbox), frame, TRUE, TRUE, 4);
        gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_IN);
        eb = gtk_event_box_new();
        gtk_container_add(GTK_CONTAINER(frame), eb);

        gtk_container_set_border_width(GTK_CONTAINER(eb), 4);

        handler = handler_for(type);
        if (handler)
        {
                char *link;

                link = readlink_dup(handler);
                if (link)
                {
                        char *msg;

                        msg = g_strdup_printf(_("Currently %s"), link);
                        gtk_tooltips_set_tip(tooltips, eb, msg, NULL);
                        g_free(link);
                        g_free(msg);
                }
                g_free(handler);
        }

        gtk_drag_dest_set(eb, GTK_DEST_DEFAULT_ALL,
                        targets, sizeof(targets) / sizeof(*targets),
                        GDK_ACTION_COPY);
        gtk_signal_connect(GTK_OBJECT(eb), "drag_data_received",
                        GTK_SIGNAL_FUNC(drag_app_dropped), dialog);

        label = gtk_label_new(_("Drop a suitable\napplication here"));
        gtk_misc_set_padding(GTK_MISC(label), 10, 20);
        gtk_container_add(GTK_CONTAINER(eb), label);

        hbox = gtk_hbox_new(FALSE, 4);
        gtk_box_pack_start(GTK_BOX(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(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(vbox), entry, FALSE, TRUE, 0);
        gtk_widget_grab_focus(entry);
        gtk_object_set_data(GTK_OBJECT(dialog), "shell_command", entry);
        gtk_signal_connect_object(GTK_OBJECT(entry), "activate",
                        GTK_SIGNAL_FUNC(set_shell_action), GTK_OBJECT(dialog));

        hbox = gtk_hbox_new(TRUE, 4);
        gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, TRUE, 0);
        
        /* 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_entry_set_position(GTK_ENTRY(entry), -1);
                g_free(tmp);
        }
        else
        {
                gtk_entry_set_text(GTK_ENTRY(entry), " \"$1\"");
                gtk_entry_set_position(GTK_ENTRY(entry), 0);
        }

        button = gtk_button_new_with_label(_("OK"));
        gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, TRUE, 0);
        GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
        gtk_window_set_default(GTK_WINDOW(dialog), button);
        gtk_signal_connect_object(GTK_OBJECT(button), "clicked",
                        GTK_SIGNAL_FUNC(set_shell_action), GTK_OBJECT(dialog));
        
        button = gtk_button_new_with_label(_("Cancel"));
        GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
        gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, TRUE, 0);
        gtk_signal_connect_object(GTK_OBJECT(button), "clicked",
                        GTK_SIGNAL_FUNC(gtk_widget_destroy),
                        GTK_OBJECT(dialog));

        gtk_widget_show_all(dialog);
}

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

        g_return_val_if_fail(dialog != NULL, NULL);
        type = gtk_object_get_data(GTK_OBJECT(dialog), "mime_type");
        for_all = gtk_object_get_data(GTK_OBJECT(dialog), "set_for_all");
        g_return_val_if_fail(for_all != NULL && type != NULL, NULL);

        if (gtk_toggle_button_get_active(for_all))
                type_name = g_strdup(type->media_type);
        else
                type_name = g_strconcat(type->media_type, "_",
                                type->subtype, NULL);

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

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

        if (lstat(path, &info) == 0)
        {
                /* A binding already exists... */
                if (S_ISREG(info.st_mode) && info.st_size > 256)
                {
                        if (get_choice(PROJECT,
                                _("A run action already exists and is quite "
                                "a big program - are you sure you want to "
                                "delete it?"), 2, "Cancel", "Delete") != 1)
                        {
                                g_free(path);
                                path = NULL;
                                goto out;
                        }
                }
                
                if (unlink(path))
                {
                        report_error(_("Can't remove %s: %s"),
                                path, g_strerror(errno));
                        g_free(path);
                        path = NULL;
                        goto out;
                }
        }

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 special_directory;
                case TYPE_PIPE:
                        return special_pipe;
                case TYPE_SOCKET:
                        return special_socket;
                case TYPE_BLOCK_DEVICE:
                        return special_block_dev;
                case TYPE_CHAR_DEVICE:
                        return special_char_dev;
        }
        return special_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;

        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 &&
                !(item->mime_type == special_exec);
}

/* Open all <Choices>/type directories and display a message */
static void open_choices_dirs(gchar *type, gchar *what)
{
        guchar *dir;
        GPtrArray *list;
        int i;

        dir = choices_find_path_save("", type, TRUE);
        g_free(dir);
        list = choices_list_dirs(type);

        for (i = list->len - 1; i >= 0; i--)
                filer_opendir(list->pdata[i], NULL);

        choices_free_list(list);
}

/* To edit the MIME types, open a filer window for <Choices>/MIME-info */
static void edit_mime_types(guchar *unused)
{
        open_choices_dirs("MIME-info", "the files defining MIME types");
}

static void reread_mime_files(guchar *unused)
{
        type_reread();
}

static GList *build_type_reread(Option *none, xmlNode *node, guchar *label)
{
        GtkWidget *button, *align;

        g_return_val_if_fail(none == NULL, NULL);

        align = gtk_alignment_new(0.1, 0, 0.1, 0);
        button = gtk_button_new_with_label(_(label));
        gtk_container_add(GTK_CONTAINER(align), button);

        gtk_signal_connect_object(GTK_OBJECT(button), "clicked",
                        GTK_SIGNAL_FUNC(reread_mime_files), NULL);

        return g_list_append(NULL, align);
}

static GList *build_type_edit(Option *none, xmlNode *node, guchar *label)
{
        GtkWidget *button, *align;

        g_return_val_if_fail(none == NULL, NULL);

        align = gtk_alignment_new(0.1, 0, 0.1, 0);
        button = gtk_button_new_with_label(_(label));
        gtk_container_add(GTK_CONTAINER(align), button);

        gtk_signal_connect_object(GTK_OBJECT(button), "clicked",
                        GTK_SIGNAL_FUNC(edit_mime_types), NULL);

        return g_list_append(NULL, align);
}

/* 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_cmap(),
                                         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_cmap(),
                                type_colours, NUM_TYPE_COLOURS,
                                FALSE, TRUE, success);
                allocated = TRUE;
        }
}

/* Return a pointer to a (static) colour for this item. If colouring is
 * off, returns normal.
 */
GdkColor *type_get_colour(DirItem *item, GdkColor *normal)
{
        if (!o_display_colour_types.int_value)
                return normal;

        if (item->flags & ITEM_FLAG_EXEC_FILE)
                return &type_colours[8];
        else if (item->flags & ITEM_FLAG_APPDIR)
                return &type_colours[9];
        else
                return &type_colours[item->base_type];
}