/* nautilus-file-utilities.c - implementation of file manipulation routines.
 *
 *  Copyright (C) 1999, 2000, 2001 Eazel, Inc.
 *
 *  The Gnome Library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public License as
 *  published by the Free Software Foundation; either version 2 of the
 *  License, or (at your option) any later version.
 *
 *  The Gnome Library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with the Gnome Library; see the file COPYING.LIB.  If not,
 *  see <http://www.gnu.org/licenses/>.
 *
 *  Authors: John Sullivan <sullivan@eazel.com>
 */

#include <config.h>
#include "nautilus-file-utilities.h"

#include "nautilus-global-preferences.h"
#include "nautilus-icon-names.h"
#include "nautilus-lib-self-check-functions.h"
#include "nautilus-metadata.h"
#include "nautilus-file.h"
#include "nautilus-file-operations.h"
#include "nautilus-search-directory.h"
#include "nautilus-starred-directory.h"
#include "nautilus-ui-utilities.h"
#include <eel/eel-glib-extensions.h>
#include <eel/eel-string.h>
#include <eel/eel-debug.h>
#include <eel/eel-vfs-extensions.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <glib/gstdio.h>
#include <gio/gio.h>
#include <unistd.h>
#include <stdlib.h>

#define NAUTILUS_USER_DIRECTORY_NAME "nautilus"
#define DEFAULT_NAUTILUS_DIRECTORY_MODE (0755)

/* Allowed characters outside alphanumeric for unreserved. */
#define G_URI_OTHER_UNRESERVED "-._~"

/* This or something equivalent will eventually go into glib/guri.h */
gboolean
nautilus_uri_parse (const char  *uri,
                    char       **host,
                    guint16     *port,
                    char       **userinfo)
{
    char *tmp_str;
    const char *start, *p;
    char c;

    g_return_val_if_fail (uri != NULL, FALSE);

    if (host)
    {
        *host = NULL;
    }

    if (port)
    {
        *port = 0;
    }

    if (userinfo)
    {
        *userinfo = NULL;
    }

    /* From RFC 3986 Decodes:
     * URI          = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
     * hier-part    = "//" authority path-abempty
     * path-abempty = *( "/" segment )
     * authority    = [ userinfo "@" ] host [ ":" port ]
     */

    /* Check we have a valid scheme */
    tmp_str = g_uri_parse_scheme (uri);

    if (tmp_str == NULL)
    {
        return FALSE;
    }

    g_free (tmp_str);

    /* Decode hier-part:
     *  hier-part   = "//" authority path-abempty
     */
    p = uri;
    start = strstr (p, "//");

    if (start == NULL)
    {
        return FALSE;
    }

    start += 2;

    if (strchr (start, '@') != NULL)
    {
        /* Decode userinfo:
         * userinfo      = *( unreserved / pct-encoded / sub-delims / ":" )
         * unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
         * pct-encoded   = "%" HEXDIG HEXDIG
         */
        p = start;
        while (1)
        {
            c = *p++;

            if (c == '@')
            {
                break;
            }

            /* pct-encoded */
            if (c == '%')
            {
                if (!(g_ascii_isxdigit (p[0]) ||
                      g_ascii_isxdigit (p[1])))
                {
                    return FALSE;
                }

                p++;

                continue;
            }

            /* unreserved /  sub-delims / : */
            if (!(g_ascii_isalnum (c) ||
                  strchr (G_URI_OTHER_UNRESERVED, c) ||
                  strchr (G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS, c) ||
                  c == ':'))
            {
                return FALSE;
            }
        }

        if (userinfo)
        {
            *userinfo = g_strndup (start, p - start - 1);
        }

        start = p;
    }
    else
    {
        p = start;
    }


    /* decode host:
     * host          = IP-literal / IPv4address / reg-name
     * reg-name      = *( unreserved / pct-encoded / sub-delims )
     */

    /* If IPv6 or IPvFuture */
    if (*p == '[')
    {
        start++;
        p++;
        while (1)
        {
            c = *p++;

            if (c == ']')
            {
                break;
            }

            /* unreserved /  sub-delims */
            if (!(g_ascii_isalnum (c) ||
                  strchr (G_URI_OTHER_UNRESERVED, c) ||
                  strchr (G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS, c) ||
                  c == ':' ||
                  c == '.'))
            {
                goto error;
            }
        }
    }
    else
    {
        while (1)
        {
            c = *p++;

            if (c == ':' ||
                c == '/' ||
                c == '?' ||
                c == '#' ||
                c == '\0')
            {
                break;
            }

            /* pct-encoded */
            if (c == '%')
            {
                if (!(g_ascii_isxdigit (p[0]) ||
                      g_ascii_isxdigit (p[1])))
                {
                    goto error;
                }

                p++;

                continue;
            }

            /* unreserved /  sub-delims */
            if (!(g_ascii_isalnum (c) ||
                  strchr (G_URI_OTHER_UNRESERVED, c) ||
                  strchr (G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS, c)))
            {
                goto error;
            }
        }
    }

    if (host)
    {
        *host = g_uri_unescape_segment (start, p - 1, NULL);
    }

    if (c == ':')
    {
        /* Decode pot:
         *  port          = *DIGIT
         */
        guint tmp = 0;

        while (1)
        {
            c = *p++;

            if (c == '/' ||
                c == '?' ||
                c == '#' ||
                c == '\0')
            {
                break;
            }

            if (!g_ascii_isdigit (c))
            {
                goto error;
            }

            tmp = (tmp * 10) + (c - '0');

            if (tmp > 65535)
            {
                goto error;
            }
        }
        if (port)
        {
            *port = (guint16) tmp;
        }
    }

    return TRUE;

error:
    if (host && *host)
    {
        g_free (*host);
        *host = NULL;
    }

    if (userinfo && *userinfo)
    {
        g_free (*userinfo);
        *userinfo = NULL;
    }

    return FALSE;
}

char *
nautilus_compute_title_for_location (GFile *location)
{
    NautilusFile *file;
    GMount *mount;
    char *title;

    /* TODO-gio: This doesn't really work all that great if the
     *  info about the file isn't known atm... */

    if (nautilus_is_home_directory (location))
    {
        return g_strdup (_("Home"));
    }

    if ((mount = nautilus_get_mounted_mount_for_root (location)) != NULL)
    {
        title = g_mount_get_name (mount);

        g_object_unref (mount);

        return title;
    }

    title = NULL;
    if (location)
    {
        file = nautilus_file_get (location);

        if (nautilus_file_is_other_locations (file))
        {
            title = g_strdup (_("Other Locations"));
        }
        else if (nautilus_file_is_starred_location (file))
        {
            title = g_strdup (_("Starred"));
        }
        {
            title = nautilus_file_get_description (file);

            if (title == NULL)
            {
                title = nautilus_file_get_display_name (file);
            }
        }
        nautilus_file_unref (file);
    }

    if (title == NULL)
    {
        title = g_file_get_basename (location);
    }

    return title;
}


/**
 * nautilus_get_user_directory:
 *
 * Get the path for the directory containing nautilus settings.
 *
 * Return value: the directory path.
 **/
char *
nautilus_get_user_directory (void)
{
    char *user_directory = NULL;

    user_directory = g_build_filename (g_get_user_config_dir (),
                                       NAUTILUS_USER_DIRECTORY_NAME,
                                       NULL);

    if (!g_file_test (user_directory, G_FILE_TEST_EXISTS))
    {
        g_mkdir_with_parents (user_directory, DEFAULT_NAUTILUS_DIRECTORY_MODE);
        /* FIXME bugzilla.gnome.org 41286:
         * How should we handle the case where this mkdir fails?
         * Note that nautilus_application_startup will refuse to launch if this
         * directory doesn't get created, so that case is OK. But the directory
         * could be deleted after Nautilus was launched, and perhaps
         * there is some bad side-effect of not handling that case.
         */
    }

    return user_directory;
}

/**
 * nautilus_get_scripts_directory_path:
 *
 * Get the path for the directory containing nautilus scripts.
 *
 * Return value: the directory path containing nautilus scripts
 **/
char *
nautilus_get_scripts_directory_path (void)
{
    return g_build_filename (g_get_user_data_dir (), "nautilus", "scripts", NULL);
}

char *
nautilus_get_home_directory_uri (void)
{
    return g_filename_to_uri (g_get_home_dir (), NULL, NULL);
}


gboolean
nautilus_should_use_templates_directory (void)
{
    const char *dir;
    gboolean res;

    dir = g_get_user_special_dir (G_USER_DIRECTORY_TEMPLATES);
    res = dir && (g_strcmp0 (dir, g_get_home_dir ()) != 0);
    return res;
}

char *
nautilus_get_templates_directory (void)
{
    return g_strdup (g_get_user_special_dir (G_USER_DIRECTORY_TEMPLATES));
}

char *
nautilus_get_templates_directory_uri (void)
{
    char *directory, *uri;

    directory = nautilus_get_templates_directory ();
    uri = g_filename_to_uri (directory, NULL, NULL);
    g_free (directory);
    return uri;
}

gboolean
nautilus_is_home_directory_file (GFile      *dir,
                                 const char *filename)
{
    char *dirname;
    static GFile *home_dir_dir = NULL;
    static char *home_dir_filename = NULL;

    if (home_dir_dir == NULL)
    {
        dirname = g_path_get_dirname (g_get_home_dir ());
        home_dir_dir = g_file_new_for_path (dirname);
        g_free (dirname);
        home_dir_filename = g_path_get_basename (g_get_home_dir ());
    }

    return (g_file_equal (dir, home_dir_dir) &&
            strcmp (filename, home_dir_filename) == 0);
}

gboolean
nautilus_is_home_directory (GFile *dir)
{
    static GFile *home_dir = NULL;

    if (home_dir == NULL)
    {
        home_dir = g_file_new_for_path (g_get_home_dir ());
    }

    return g_file_equal (dir, home_dir);
}

gboolean
nautilus_is_root_directory (GFile *dir)
{
    static GFile *root_dir = NULL;

    if (root_dir == NULL)
    {
        root_dir = g_file_new_for_path ("/");
    }

    return g_file_equal (dir, root_dir);
}

gboolean
nautilus_is_search_directory (GFile *dir)
{
    g_autofree gchar *uri = NULL;

    uri = g_file_get_uri (dir);
    return eel_uri_is_search (uri);
}

gboolean
nautilus_is_recent_directory (GFile *dir)
{
    g_autofree gchar *uri = NULL;

    uri = g_file_get_uri (dir);

    return eel_uri_is_recent (uri);
}

gboolean
nautilus_is_starred_directory (GFile *dir)
{
    g_autofree gchar *uri = NULL;

    uri = g_file_get_uri (dir);

    if (eel_uri_is_starred (uri))
    {
        return TRUE;
    }

    return FALSE;
}

gboolean
nautilus_is_trash_directory (GFile *dir)
{
    g_autofree gchar *uri = NULL;

    uri = g_file_get_uri (dir);
    return eel_uri_is_trash (uri);
}

gboolean
nautilus_is_other_locations_directory (GFile *dir)
{
    g_autofree gchar *uri = NULL;

    uri = g_file_get_uri (dir);
    return eel_uri_is_other_locations (uri);
}

GMount *
nautilus_get_mounted_mount_for_root (GFile *location)
{
    GVolumeMonitor *volume_monitor;
    GList *mounts;
    GList *l;
    GMount *mount;
    GMount *result = NULL;
    GFile *root = NULL;
    GFile *default_location = NULL;

    volume_monitor = g_volume_monitor_get ();
    mounts = g_volume_monitor_get_mounts (volume_monitor);

    for (l = mounts; l != NULL; l = l->next)
    {
        mount = l->data;

        if (g_mount_is_shadowed (mount))
        {
            continue;
        }

        root = g_mount_get_root (mount);
        if (g_file_equal (location, root))
        {
            result = g_object_ref (mount);
            break;
        }

        default_location = g_mount_get_default_location (mount);
        if (!g_file_equal (default_location, root) &&
            g_file_equal (location, default_location))
        {
            result = g_object_ref (mount);
            break;
        }
    }

    g_clear_object (&root);
    g_clear_object (&default_location);
    g_list_free_full (mounts, g_object_unref);

    return result;
}

GFile *
nautilus_generate_unique_file_in_directory (GFile      *directory,
                                            const char *basename)
{
    g_autofree char *basename_without_extension = NULL;
    const char *extension;
    GFile *child;
    int copy;

    g_return_val_if_fail (directory != NULL, NULL);
    g_return_val_if_fail (basename != NULL, NULL);
    g_return_val_if_fail (g_file_query_exists (directory, NULL), NULL);

    basename_without_extension = eel_filename_strip_extension (basename);
    extension = eel_filename_get_extension_offset (basename);

    child = g_file_get_child (directory, basename);

    copy = 1;
    while (g_file_query_exists (child, NULL))
    {
        g_autofree char *filename = NULL;

        g_object_unref (child);

        filename = g_strdup_printf ("%s (%d)%s",
                                    basename_without_extension,
                                    copy,
                                    extension ? extension : "");
        child = g_file_get_child (directory, filename);

        copy++;
    }

    return child;
}

GFile *
nautilus_find_existing_uri_in_hierarchy (GFile *location)
{
    GFileInfo *info;
    GFile *tmp;

    g_assert (location != NULL);

    location = g_object_ref (location);
    while (location != NULL)
    {
        info = g_file_query_info (location,
                                  G_FILE_ATTRIBUTE_STANDARD_NAME,
                                  0, NULL, NULL);
        g_object_unref (info);
        if (info != NULL)
        {
            return location;
        }
        tmp = location;
        location = g_file_get_parent (location);
        g_object_unref (tmp);
    }

    return location;
}

static gboolean
have_program_in_path (const char *name)
{
    gchar *path;
    gboolean result;

    path = g_find_program_in_path (name);
    result = (path != NULL);
    g_free (path);
    return result;
}

static GIcon *
special_directory_get_icon (GUserDirectory directory,
                            gboolean       symbolic)
{
#define ICON_CASE(x)                                                     \
    case G_USER_DIRECTORY_ ## x:                                     \
        return (symbolic) ? g_themed_icon_new (NAUTILUS_ICON_FOLDER_ ## x) : g_themed_icon_new (NAUTILUS_ICON_FULLCOLOR_FOLDER_ ## x);

    switch (directory)
    {
        ICON_CASE (DOCUMENTS);
        ICON_CASE (DOWNLOAD);
        ICON_CASE (MUSIC);
        ICON_CASE (PICTURES);
        ICON_CASE (PUBLIC_SHARE);
        ICON_CASE (TEMPLATES);
        ICON_CASE (VIDEOS);

        default:
            return (symbolic) ? g_themed_icon_new (NAUTILUS_ICON_FOLDER) : g_themed_icon_new (NAUTILUS_ICON_FULLCOLOR_FOLDER);
    }

#undef ICON_CASE
}

GIcon *
nautilus_special_directory_get_symbolic_icon (GUserDirectory directory)
{
    return special_directory_get_icon (directory, TRUE);
}

GIcon *
nautilus_special_directory_get_icon (GUserDirectory directory)
{
    return special_directory_get_icon (directory, FALSE);
}

gboolean
nautilus_is_file_roller_installed (void)
{
    static int installed = -1;

    if (installed < 0)
    {
        if (have_program_in_path ("file-roller"))
        {
            installed = 1;
        }
        else
        {
            installed = 0;
        }
    }

    return installed > 0 ? TRUE : FALSE;
}

/* Returns TRUE if the file is in XDG_DATA_DIRS. This is used for
 *  deciding if a desktop file is "trusted" based on the path */
gboolean
nautilus_is_in_system_dir (GFile *file)
{
    const char * const *data_dirs;
    char *path;
    int i;
    gboolean res;

    if (!g_file_is_native (file))
    {
        return FALSE;
    }

    path = g_file_get_path (file);

    res = FALSE;

    data_dirs = g_get_system_data_dirs ();
    for (i = 0; path != NULL && data_dirs[i] != NULL; i++)
    {
        if (g_str_has_prefix (path, data_dirs[i]))
        {
            res = TRUE;
            break;
        }
    }

    g_free (path);

    return res;
}

GHashTable *
nautilus_trashed_files_get_original_directories (GList  *files,
                                                 GList **unhandled_files)
{
    GHashTable *directories;
    NautilusFile *file, *original_file, *original_dir;
    GList *l, *m;

    directories = NULL;

    if (unhandled_files != NULL)
    {
        *unhandled_files = NULL;
    }

    for (l = files; l != NULL; l = l->next)
    {
        file = NAUTILUS_FILE (l->data);
        original_file = nautilus_file_get_trash_original_file (file);

        original_dir = NULL;
        if (original_file != NULL)
        {
            original_dir = nautilus_file_get_parent (original_file);
        }

        if (original_dir != NULL)
        {
            if (directories == NULL)
            {
                directories = g_hash_table_new_full (g_direct_hash, g_direct_equal,
                                                     (GDestroyNotify) nautilus_file_unref,
                                                     (GDestroyNotify) nautilus_file_list_free);
            }
            nautilus_file_ref (original_dir);
            m = g_hash_table_lookup (directories, original_dir);
            if (m != NULL)
            {
                g_hash_table_steal (directories, original_dir);
                nautilus_file_unref (original_dir);
            }
            m = g_list_append (m, nautilus_file_ref (file));
            g_hash_table_insert (directories, original_dir, m);
        }
        else if (unhandled_files != NULL)
        {
            *unhandled_files = g_list_append (*unhandled_files, nautilus_file_ref (file));
        }

        nautilus_file_unref (original_file);
        nautilus_file_unref (original_dir);
    }

    return directories;
}

GList *
nautilus_file_list_from_uri_list (GList *uris)
{
    GList *l;
    GList *result = NULL;

    for (l = uris; l != NULL; l = l->next)
    {
        g_autoptr (GFile) location = NULL;

        location = g_file_new_for_uri (l->data);
        result = g_list_prepend (result, nautilus_file_get (location));
    }

    return g_list_reverse (result);
}

static GList *
locations_from_file_list (GList *file_list)
{
    NautilusFile *file;
    GList *l, *ret;

    ret = NULL;

    for (l = file_list; l != NULL; l = l->next)
    {
        file = NAUTILUS_FILE (l->data);
        ret = g_list_prepend (ret, nautilus_file_get_location (file));
    }

    return g_list_reverse (ret);
}

typedef struct
{
    GHashTable *original_dirs_hash;
    GtkWindow *parent_window;
} RestoreFilesData;

static void
ensure_dirs_task_ready_cb (GObject      *_source,
                           GAsyncResult *res,
                           gpointer      user_data)
{
    NautilusFile *original_dir;
    GFile *original_dir_location;
    GList *original_dirs, *files, *locations, *l;
    RestoreFilesData *data = user_data;

    original_dirs = g_hash_table_get_keys (data->original_dirs_hash);
    for (l = original_dirs; l != NULL; l = l->next)
    {
        original_dir = NAUTILUS_FILE (l->data);
        original_dir_location = nautilus_file_get_location (original_dir);

        files = g_hash_table_lookup (data->original_dirs_hash, original_dir);
        locations = locations_from_file_list (files);

        nautilus_file_operations_move
            (locations,
            original_dir_location,
            data->parent_window,
            NULL, NULL);

        g_list_free_full (locations, g_object_unref);
        g_object_unref (original_dir_location);
    }

    g_list_free (original_dirs);

    g_hash_table_unref (data->original_dirs_hash);
    g_slice_free (RestoreFilesData, data);
}

static void
ensure_dirs_task_thread_func (GTask        *task,
                              gpointer      source,
                              gpointer      task_data,
                              GCancellable *cancellable)
{
    RestoreFilesData *data = task_data;
    NautilusFile *original_dir;
    GFile *original_dir_location;
    GList *original_dirs, *l;

    original_dirs = g_hash_table_get_keys (data->original_dirs_hash);
    for (l = original_dirs; l != NULL; l = l->next)
    {
        original_dir = NAUTILUS_FILE (l->data);
        original_dir_location = nautilus_file_get_location (original_dir);

        g_file_make_directory_with_parents (original_dir_location, cancellable, NULL);
        g_object_unref (original_dir_location);
    }

    g_task_return_pointer (task, NULL, NULL);
}

static void
restore_files_ensure_parent_directories (GHashTable *original_dirs_hash,
                                         GtkWindow  *parent_window)
{
    RestoreFilesData *data;
    GTask *ensure_dirs_task;

    data = g_slice_new0 (RestoreFilesData);
    data->parent_window = parent_window;
    data->original_dirs_hash = g_hash_table_ref (original_dirs_hash);

    ensure_dirs_task = g_task_new (NULL, NULL, ensure_dirs_task_ready_cb, data);
    g_task_set_task_data (ensure_dirs_task, data, NULL);
    g_task_run_in_thread (ensure_dirs_task, ensure_dirs_task_thread_func);
    g_object_unref (ensure_dirs_task);
}

void
nautilus_restore_files_from_trash (GList     *files,
                                   GtkWindow *parent_window)
{
    NautilusFile *file;
    GHashTable *original_dirs_hash;
    GList *unhandled_files, *l;
    char *message, *file_name;

    original_dirs_hash = nautilus_trashed_files_get_original_directories (files, &unhandled_files);

    for (l = unhandled_files; l != NULL; l = l->next)
    {
        file = NAUTILUS_FILE (l->data);
        file_name = nautilus_file_get_display_name (file);
        message = g_strdup_printf (_("Could not determine original location of “%s” "), file_name);
        g_free (file_name);

        show_dialog (message,
                     _("The item cannot be restored from trash"),
                     parent_window,
                     GTK_MESSAGE_WARNING);
        g_free (message);
    }

    if (original_dirs_hash != NULL)
    {
        restore_files_ensure_parent_directories (original_dirs_hash, parent_window);
        g_hash_table_unref (original_dirs_hash);
    }

    nautilus_file_list_unref (unhandled_files);
}

typedef struct
{
    NautilusMountGetContent callback;
    gpointer user_data;
} GetContentTypesData;

static void
get_types_cb (GObject      *source_object,
              GAsyncResult *res,
              gpointer      user_data)
{
    GetContentTypesData *data;
    char **types;

    data = user_data;
    types = g_mount_guess_content_type_finish (G_MOUNT (source_object), res, NULL);

    g_object_set_data_full (source_object,
                            "nautilus-content-type-cache",
                            g_strdupv (types),
                            (GDestroyNotify) g_strfreev);

    if (data->callback)
    {
        data->callback ((const char **) types, data->user_data);
    }
    g_strfreev (types);
    g_slice_free (GetContentTypesData, data);
}

void
nautilus_get_x_content_types_for_mount_async (GMount                  *mount,
                                              NautilusMountGetContent  callback,
                                              GCancellable            *cancellable,
                                              gpointer                 user_data)
{
    char **cached;
    GetContentTypesData *data;

    if (mount == NULL)
    {
        if (callback)
        {
            callback (NULL, user_data);
        }
        return;
    }

    cached = g_object_get_data (G_OBJECT (mount), "nautilus-content-type-cache");
    if (cached != NULL)
    {
        if (callback)
        {
            callback ((const char **) cached, user_data);
        }
        return;
    }

    data = g_slice_new0 (GetContentTypesData);
    data->callback = callback;
    data->user_data = user_data;

    g_mount_guess_content_type (mount,
                                FALSE,
                                cancellable,
                                get_types_cb,
                                data);
}

char **
nautilus_get_cached_x_content_types_for_mount (GMount *mount)
{
    char **cached;

    if (mount == NULL)
    {
        return NULL;
    }

    cached = g_object_get_data (G_OBJECT (mount), "nautilus-content-type-cache");
    if (cached != NULL)
    {
        return g_strdupv (cached);
    }

    return NULL;
}

char *
get_message_for_content_type (const char *content_type)
{
    char *message;
    char *description;

    description = g_content_type_get_description (content_type);

    /* Customize greeting for well-known content types */
    if (strcmp (content_type, "x-content/audio-cdda") == 0)
    {
        /* translators: these describe the contents of removable media */
        message = g_strdup (_("Audio CD"));
    }
    else if (strcmp (content_type, "x-content/audio-dvd") == 0)
    {
        message = g_strdup (_("Audio DVD"));
    }
    else if (strcmp (content_type, "x-content/video-dvd") == 0)
    {
        message = g_strdup (_("Video DVD"));
    }
    else if (strcmp (content_type, "x-content/video-vcd") == 0)
    {
        message = g_strdup (_("Video CD"));
    }
    else if (strcmp (content_type, "x-content/video-svcd") == 0)
    {
        message = g_strdup (_("Super Video CD"));
    }
    else if (strcmp (content_type, "x-content/image-photocd") == 0)
    {
        message = g_strdup (_("Photo CD"));
    }
    else if (strcmp (content_type, "x-content/image-picturecd") == 0)
    {
        message = g_strdup (_("Picture CD"));
    }
    else if (strcmp (content_type, "x-content/image-dcf") == 0)
    {
        message = g_strdup (_("Contains digital photos"));
    }
    else if (strcmp (content_type, "x-content/audio-player") == 0)
    {
        message = g_strdup (_("Contains music"));
    }
    else if (strcmp (content_type, "x-content/unix-software") == 0)
    {
        message = g_strdup (_("Contains software"));
    }
    else
    {
        /* fallback to generic greeting */
        message = g_strdup_printf (_("Detected as “%s”"), description);
    }

    g_free (description);

    return message;
}

char *
get_message_for_two_content_types (const char * const *content_types)
{
    char *message;

    g_assert (content_types[0] != NULL);
    g_assert (content_types[1] != NULL);

    /* few combinations make sense */
    if (strcmp (content_types[0], "x-content/image-dcf") == 0
        || strcmp (content_types[1], "x-content/image-dcf") == 0)
    {
        if (strcmp (content_types[0], "x-content/audio-player") == 0)
        {
            /* translators: these describe the contents of removable media */
            message = g_strdup (_("Contains music and photos"));
        }
        else if (strcmp (content_types[1], "x-content/audio-player") == 0)
        {
            message = g_strdup (_("Contains photos and music"));
        }
        else
        {
            message = g_strdup (_("Contains digital photos"));
        }
    }
    else if ((strcmp (content_types[0], "x-content/video-vcd") == 0
              || strcmp (content_types[1], "x-content/video-vcd") == 0)
             && (strcmp (content_types[0], "x-content/video-dvd") == 0
                 || strcmp (content_types[1], "x-content/video-dvd") == 0))
    {
        message = g_strdup_printf ("%s/%s",
                                   get_message_for_content_type (content_types[0]),
                                   get_message_for_content_type (content_types[1]));
    }
    else
    {
        message = get_message_for_content_type (content_types[0]);
    }

    return message;
}

gboolean
should_handle_content_type (const char *content_type)
{
    GAppInfo *default_app;

    default_app = g_app_info_get_default_for_type (content_type, FALSE);

    return !g_str_has_prefix (content_type, "x-content/blank-") &&
           !g_content_type_is_a (content_type, "x-content/win32-software") &&
           default_app != NULL;
}

gboolean
should_handle_content_types (const char * const *content_types)
{
    int i;

    for (i = 0; content_types[i] != NULL; i++)
    {
        if (should_handle_content_type (content_types[i]))
        {
            return TRUE;
        }
    }

    return FALSE;
}

gboolean
nautilus_file_selection_equal (GList *selection_a,
                               GList *selection_b)
{
    GList *al, *bl;
    gboolean selection_matches;

    if (selection_a == NULL || selection_b == NULL)
    {
        return (selection_a == selection_b);
    }

    if (g_list_length (selection_a) != g_list_length (selection_b))
    {
        return FALSE;
    }

    selection_matches = TRUE;

    for (al = selection_a; al; al = al->next)
    {
        GFile *a_location = nautilus_file_get_location (NAUTILUS_FILE (al->data));
        gboolean found = FALSE;

        for (bl = selection_b; bl; bl = bl->next)
        {
            GFile *b_location = nautilus_file_get_location (NAUTILUS_FILE (bl->data));
            found = g_file_equal (b_location, a_location);
            g_object_unref (b_location);

            if (found)
            {
                break;
            }
        }

        selection_matches = found;
        g_object_unref (a_location);

        if (!selection_matches)
        {
            break;
        }
    }

    return selection_matches;
}

static char *
trim_whitespace (const gchar *string)
{
    glong space_count;
    glong length;
    gchar *offset;

    space_count = 0;
    length = g_utf8_strlen (string, -1);
    offset = g_utf8_offset_to_pointer (string, length);

    while (space_count <= length)
    {
        gunichar character;

        offset = g_utf8_prev_char (offset);
        character = g_utf8_get_char (offset);

        if (!g_unichar_isspace (character))
        {
            break;
        }

        space_count++;
    }

    if (space_count == 0)
    {
        return g_strdup (string);
    }

    return g_utf8_substring (string, 0, length - space_count);
}

char *
nautilus_get_common_filename_prefix (GList *file_list,
                                     int    min_required_len)
{
    GList *file_names = NULL;
    GList *directory_names = NULL;
    char *result_files;
    g_autofree char *result = NULL;
    g_autofree char *result_trimmed = NULL;

    if (file_list == NULL)
    {
        return NULL;
    }

    for (GList *l = file_list; l != NULL; l = l->next)
    {
        char *name;

        g_return_val_if_fail (NAUTILUS_IS_FILE (l->data), NULL);

        name = nautilus_file_get_display_name (l->data);

        /* Since the concept of file extensions does not apply to directories,
         * we filter those out.
         */
        if (nautilus_file_is_directory (l->data))
        {
            directory_names = g_list_prepend (directory_names, name);
        }
        else
        {
            file_names = g_list_prepend (file_names, name);
        }
    }

    result_files = nautilus_get_common_filename_prefix_from_filenames (file_names, min_required_len);

    if (directory_names == NULL)
    {
        return result_files;
    }

    if (result_files != NULL)
    {
        directory_names = g_list_prepend (directory_names, result_files);
    }

    result = eel_str_get_common_prefix (directory_names, min_required_len);

    g_list_free_full (file_names, g_free);
    g_list_free_full (directory_names, g_free);

    if (result == NULL)
    {
        return NULL;
    }

    result_trimmed = trim_whitespace (result);

    if (g_utf8_strlen (result_trimmed, -1) < min_required_len)
    {
        return NULL;
    }

    return g_steal_pointer (&result_trimmed);
}

char *
nautilus_get_common_filename_prefix_from_filenames (GList *filenames,
                                                    int    min_required_len)
{
    GList *stripped_filenames = NULL;
    char *common_prefix;
    char *truncated;
    int common_prefix_len;

    for (GList *i = filenames; i != NULL; i = i->next)
    {
        gchar *stripped_filename;

        stripped_filename = eel_filename_strip_extension (i->data);

        stripped_filenames = g_list_prepend (stripped_filenames, stripped_filename);
    }

    common_prefix = eel_str_get_common_prefix (stripped_filenames, min_required_len);
    if (common_prefix == NULL)
    {
        return NULL;
    }

    g_list_free_full (stripped_filenames, g_free);

    truncated = trim_whitespace (common_prefix);
    g_free (common_prefix);

    common_prefix_len = g_utf8_strlen (truncated, -1);
    if (common_prefix_len < min_required_len)
    {
        g_free (truncated);
        return NULL;
    }

    return truncated;
}

#if !defined (NAUTILUS_OMIT_SELF_CHECK)

void
nautilus_self_check_file_utilities (void)
{
}

void
nautilus_ensure_extension_builtins (void)
{
    /* Please add new extension types here, even if you can guarantee
     * that they will be registered by the time the extension point
     * is iterating over its extensions.
     */
    g_type_ensure (NAUTILUS_TYPE_SEARCH_DIRECTORY);
    g_type_ensure (NAUTILUS_TYPE_STARRED_DIRECTORY);
}

void
nautilus_ensure_extension_points (void)
{
    static gsize once_init_value = 0;

    if (g_once_init_enter (&once_init_value))
    {
        GIOExtensionPoint *extension_point;

        extension_point = g_io_extension_point_register (NAUTILUS_DIRECTORY_PROVIDER_EXTENSION_POINT_NAME);
        g_io_extension_point_set_required_type (extension_point, NAUTILUS_TYPE_DIRECTORY);

        g_once_init_leave (&once_init_value, 1);
    }
}

#endif /* !NAUTILUS_OMIT_SELF_CHECK */

gboolean
nautilus_file_can_rename_files (GList *files)
{
    GList *l;
    NautilusFile *file;

    for (l = files; l != NULL; l = l->next)
    {
        file = NAUTILUS_FILE (l->data);

        if (!nautilus_file_can_rename (file))
        {
            return FALSE;
        }
    }

    return TRUE;
}

/* Try to get a native file:// URI instead of any other GVFS
 * scheme, for interoperability with apps only handling file:// URIs.
 */
gchar *
nautilus_uri_to_native_uri (const gchar *uri)
{
    g_autoptr (GFile) file = NULL;
    g_autofree gchar *path = NULL;

    file = g_file_new_for_uri (uri);
    path = g_file_get_path (file);

    if (path != NULL)
    {
        return g_filename_to_uri (path, NULL, NULL);
    }

    return NULL;
}