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[geany-mirror.git] / src / stash.c

/*
 *      stash.c - this file is part of Geany, a fast and lightweight IDE
 *
 *      Copyright 2008-2012 Nick Treleaven <nick(dot)treleaven(at)btinternet(dot)com>
 *      Copyright 2008-2012 Enrico Tröger <enrico(dot)troeger(at)uvena(dot)de>
 *
 *      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.,
 *      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/**
 * @file stash.h
 * Lightweight library for reading/writing @c GKeyFile settings and synchronizing widgets with
 * C variables.
 *
 * Note: Stash should only depend on GLib and GTK, but currently has some minor
 * dependencies on Geany's utils.c.
 *
 * @section Terms
 * 'Setting' is used only for data stored on disk or in memory.
 * 'Pref' can also include visual widget information.
 *
 * @section Memory Usage
 * Stash will not duplicate strings if they are normally static arrays, such as
 * keyfile group names and key names, string default values, widget_id names, property names.
 *
 * @section String Settings
 * String settings and other dynamically allocated settings will be initialized to NULL when
 * added to a StashGroup (so they can safely be reassigned later).
 *
 * @section Widget Support
 * Widgets very commonly used in configuration dialogs will be supported with their own function.
 * Widgets less commonly used such as @c GtkExpander or widget settings that aren't commonly needed
 * to be persistent won't be directly supported, to keep the library lightweight. However, you can
 * use stash_group_add_widget_property() to also save these settings for any read/write widget
 * property. Macros could be added for common widget properties such as @c GtkExpander:"expanded".
 *
 * @section settings-example Settings Example
 * Here we have some settings for how to make a cup - whether it should be made of china
 * and who's going to make it. (Yes, it's a stupid example).
 * @include stash-example.c
 * @note You might want to handle the warning/error conditions differently from above.
 *
 * @section prefs-example GUI Prefs Example
 * For prefs, it's the same as the above example but you tell Stash to add widget prefs instead of
 * just data settings.
 *
 * This example uses lookup strings for widgets as they are more flexible than widget pointers.
 * Code to load and save the settings is omitted - see the first example instead.
 *
 * Here we show a dialog with a toggle button for whether the cup should have a handle.
 * @include stash-gui-example.c
 * @note This example should also work for other widget containers besides dialogs, e.g. popup menus.
 */

/* Implementation Note
 * We dynamically allocate prefs. It would be more efficient for user code to declare
 * a static array of StashPref structs, but we don't do this because:
 *
 * * It would be more ugly (lots of casts and NULLs).
 * * Less type checking.
 * * The API & ABI would have to break when adding/changing fields.
 *
 * Usually the prefs code isn't what user code will spend most of its time doing, so this
 * should be efficient enough.
 */

#include "stash.h"

#include "support.h" /* only for _("text") */
#include "utils.h"   /* only for foreach_*, utils_get_setting_*(). Stash should not depend on Geany. */

#include <stdlib.h> /* only for atoi() */


/* GTK3 removed ComboBoxEntry, but we need a value to differentiate combo box with and
 * without entries, and it must not collide with other GTypes */
#ifdef GTK_TYPE_COMBO_BOX_ENTRY
#       define TYPE_COMBO_BOX_ENTRY GTK_TYPE_COMBO_BOX_ENTRY
#else /* !GTK_TYPE_COMBO_BOX_ENTRY */
#       define TYPE_COMBO_BOX_ENTRY get_combo_box_entry_type()
static GType get_combo_box_entry_type(void)
{
        static volatile gsize type = 0;
        if (g_once_init_enter(&type))
        {
                GType g_type = g_type_register_static_simple(GTK_TYPE_COMBO_BOX, "dummy-combo-box-entry",
                                sizeof(GtkComboBoxClass), NULL, sizeof(GtkComboBox), NULL, G_TYPE_FLAG_ABSTRACT);
                g_once_init_leave(&type, g_type);
        }
        return type;
}
#endif /* !GTK_TYPE_COMBO_BOX_ENTRY */


struct StashPref
{
        GType setting_type;                     /* e.g. G_TYPE_INT */
        gpointer setting;                       /* Address of a variable */
        const gchar *key_name;
        gpointer default_value;         /* Default value, e.g. (gpointer)1 */
        GType widget_type;                      /* e.g. GTK_TYPE_TOGGLE_BUTTON */
        StashWidgetID widget_id;        /* (GtkWidget*) or (gchar*) */
        union
        {
                struct EnumWidget *radio_buttons;
                const gchar *property_name;
        } extra;        /* extra fields depending on widget_type */
};

typedef struct StashPref StashPref;

struct StashGroup
{
        const gchar *name;                      /* group name to use in the keyfile */
        GPtrArray *entries;                     /* array of (StashPref*) */
        gboolean various;               /* mark group for display/edit in stash treeview */
        gboolean use_defaults;          /* use default values if there's no keyfile entry */
};

typedef struct EnumWidget
{
        StashWidgetID widget_id;
        gint enum_id;
}
EnumWidget;


typedef enum SettingAction
{
        SETTING_READ,
        SETTING_WRITE
}
SettingAction;

typedef enum PrefAction
{
        PREF_DISPLAY,
        PREF_UPDATE
}
PrefAction;


static void handle_boolean_setting(StashGroup *group, StashPref *se,
                GKeyFile *config, SettingAction action)
{
        gboolean *setting = se->setting;

        switch (action)
        {
                case SETTING_READ:
                        *setting = utils_get_setting_boolean(config, group->name, se->key_name,
                                GPOINTER_TO_INT(se->default_value));
                        break;
                case SETTING_WRITE:
                        g_key_file_set_boolean(config, group->name, se->key_name, *setting);
                        break;
        }
}


static void handle_integer_setting(StashGroup *group, StashPref *se,
                GKeyFile *config, SettingAction action)
{
        gint *setting = se->setting;

        switch (action)
        {
                case SETTING_READ:
                        *setting = utils_get_setting_integer(config, group->name, se->key_name,
                                GPOINTER_TO_INT(se->default_value));
                        break;
                case SETTING_WRITE:
                        g_key_file_set_integer(config, group->name, se->key_name, *setting);
                        break;
        }
}


static void handle_string_setting(StashGroup *group, StashPref *se,
                GKeyFile *config, SettingAction action)
{
        gchararray *setting = se->setting;

        switch (action)
        {
                case SETTING_READ:
                        g_free(*setting);
                        *setting = utils_get_setting_string(config, group->name, se->key_name,
                                se->default_value);
                        break;
                case SETTING_WRITE:
                        g_key_file_set_string(config, group->name, se->key_name,
                                *setting ? *setting : "");
                        break;
        }
}


static void handle_strv_setting(StashGroup *group, StashPref *se,
                GKeyFile *config, SettingAction action)
{
        gchararray **setting = se->setting;

        switch (action)
        {
                case SETTING_READ:
                        g_strfreev(*setting);
                        *setting = g_key_file_get_string_list(config, group->name, se->key_name,
                                NULL, NULL);
                        if (*setting == NULL)
                                *setting = g_strdupv(se->default_value);
                        break;

                case SETTING_WRITE:
                {
                        /* don't try to save a NULL string vector */
                        const gchar *dummy[] = { "", NULL };
                        const gchar **strv = *setting ? (const gchar **)*setting : dummy;

                        g_key_file_set_string_list(config, group->name, se->key_name,
                                strv, g_strv_length((gchar **)strv));
                        break;
                }
        }
}


static void keyfile_action(SettingAction action, StashGroup *group, GKeyFile *keyfile)
{
        StashPref *entry;
        guint i;

        foreach_ptr_array(entry, i, group->entries)
        {
                /* don't override settings with default values */
                if (!group->use_defaults && action == SETTING_READ &&
                        !g_key_file_has_key(keyfile, group->name, entry->key_name, NULL))
                        continue;

                switch (entry->setting_type)
                {
                        case G_TYPE_BOOLEAN:
                                handle_boolean_setting(group, entry, keyfile, action); break;
                        case G_TYPE_INT:
                                handle_integer_setting(group, entry, keyfile, action); break;
                        case G_TYPE_STRING:
                                handle_string_setting(group, entry, keyfile, action); break;
                        default:
                                /* Note: G_TYPE_STRV is not a constant, can't use case label */
                                if (entry->setting_type == G_TYPE_STRV)
                                        handle_strv_setting(group, entry, keyfile, action);
                                else
                                        g_warning("Unhandled type for %s::%s in %s()!", group->name, entry->key_name,
                                                G_STRFUNC);
                }
        }
}


/** Reads key values from @a keyfile into the group settings.
 * @note You should still call this even if the keyfile couldn't be loaded from disk
 * so that all Stash settings are initialized to defaults.
 * @param group .
 * @param keyfile Usually loaded from a configuration file first. */
void stash_group_load_from_key_file(StashGroup *group, GKeyFile *keyfile)
{
        keyfile_action(SETTING_READ, group, keyfile);
}


/** Writes group settings into key values in @a keyfile.
 * @a keyfile is usually written to a configuration file afterwards.
 * @param group .
 * @param keyfile . */
void stash_group_save_to_key_file(StashGroup *group, GKeyFile *keyfile)
{
        keyfile_action(SETTING_WRITE, group, keyfile);
}


/** Reads group settings from a configuration file using @c GKeyFile.
 * @note Stash settings will be initialized to defaults if the keyfile
 * couldn't be loaded from disk.
 * @param group .
 * @param filename Filename of the file to read, in locale encoding.
 * @return @c TRUE if a key file could be loaded.
 * @see stash_group_load_from_key_file().
 **/
gboolean stash_group_load_from_file(StashGroup *group, const gchar *filename)
{
        GKeyFile *keyfile;
        gboolean ret;

        keyfile = g_key_file_new();
        ret = g_key_file_load_from_file(keyfile, filename, 0, NULL);
        /* even on failure we load settings to apply defaults */
        stash_group_load_from_key_file(group, keyfile);

        g_key_file_free(keyfile);
        return ret;
}


/** Writes group settings to a configuration file using @c GKeyFile.
 *
 * @param group .
 * @param filename Filename of the file to write, in locale encoding.
 * @param flags Keyfile options - @c G_KEY_FILE_NONE is the most efficient.
 * @return 0 if the file was successfully written, otherwise the @c errno of the
 *         failed operation is returned.
 * @see stash_group_save_to_key_file().
 **/
gint stash_group_save_to_file(StashGroup *group, const gchar *filename,
                GKeyFileFlags flags)
{
        GKeyFile *keyfile;
        gchar *data;
        gint ret;

        keyfile = g_key_file_new();
        /* if we need to keep comments or translations, try to load first */
        if (flags)
                g_key_file_load_from_file(keyfile, filename, flags, NULL);

        stash_group_save_to_key_file(group, keyfile);
        data = g_key_file_to_data(keyfile, NULL, NULL);
        ret = utils_write_file(filename, data);
        g_free(data);
        g_key_file_free(keyfile);
        return ret;
}


/** Creates a new group.
 * @param name Name used for @c GKeyFile group.
 * @return Group. */
StashGroup *stash_group_new(const gchar *name)
{
        StashGroup *group = g_new0(StashGroup, 1);

        group->name = name;
        group->entries = g_ptr_array_new();
        group->use_defaults = TRUE;
        return group;
}


/** Frees the memory allocated for setting values in a group.
 * Useful e.g. to avoid freeing strings individually.
 * @note This is *not* called by stash_group_free().
 * @param group . */
void stash_group_free_settings(StashGroup *group)
{
        StashPref *entry;
        guint i;

        foreach_ptr_array(entry, i, group->entries)
        {
                if (entry->setting_type == G_TYPE_STRING)
                        g_free(*(gchararray *) entry->setting);
                else if (entry->setting_type == G_TYPE_STRV)
                        g_strfreev(*(gchararray **) entry->setting);
                else
                        continue;

                *(gpointer**) entry->setting = NULL;
        }
}


/** Frees a group.
 * @param group . */
void stash_group_free(StashGroup *group)
{
        StashPref *entry;
        guint i;

        foreach_ptr_array(entry, i, group->entries)
        {
                if (entry->widget_type == GTK_TYPE_RADIO_BUTTON)
                {
                        g_free(entry->extra.radio_buttons);
                }
                g_slice_free(StashPref, entry);
        }
        g_ptr_array_free(group->entries, TRUE);
        g_free(group);
}


/* Used for selecting groups passed to stash_tree_setup().
 * @c FALSE by default. */
void stash_group_set_various(StashGroup *group, gboolean various)
{
        group->various = various;
}


/* When @c FALSE, Stash doesn't change the setting if there is no keyfile entry, so it
 * remains whatever it was initialized/set to by user code.
 * @c TRUE by default. */
void stash_group_set_use_defaults(StashGroup *group, gboolean use_defaults)
{
        group->use_defaults = use_defaults;
}


static StashPref *
add_pref(StashGroup *group, GType type, gpointer setting,
                const gchar *key_name, gpointer default_value)
{
        StashPref init = {type, setting, key_name, default_value, G_TYPE_NONE, NULL, {NULL}};
        StashPref *entry = g_slice_new(StashPref);

        *entry = init;

        /* init any pointer settings to NULL so they can be freed later */
        if (type == G_TYPE_STRING ||
                type == G_TYPE_STRV)
                if (group->use_defaults)
                        *(gpointer**)setting = NULL;

        g_ptr_array_add(group->entries, entry);
        return entry;
}


/** Adds boolean setting.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Value to use if the key doesn't exist when loading. */
void stash_group_add_boolean(StashGroup *group, gboolean *setting,
                const gchar *key_name, gboolean default_value)
{
        add_pref(group, G_TYPE_BOOLEAN, setting, key_name, GINT_TO_POINTER(default_value));
}


/** Adds integer setting.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Value to use if the key doesn't exist when loading. */
void stash_group_add_integer(StashGroup *group, gint *setting,
                const gchar *key_name, gint default_value)
{
        add_pref(group, G_TYPE_INT, setting, key_name, GINT_TO_POINTER(default_value));
}


/** Adds string setting.
 * The contents of @a setting will be initialized to @c NULL.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value String to copy if the key doesn't exist when loading, or @c NULL. */
void stash_group_add_string(StashGroup *group, gchar **setting,
                const gchar *key_name, const gchar *default_value)
{
        add_pref(group, G_TYPE_STRING, setting, key_name, (gpointer)default_value);
}


/** Adds string vector setting (array of strings).
 * The contents of @a setting will be initialized to @c NULL.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Vector to copy if the key doesn't exist when loading. Usually @c NULL. */
void stash_group_add_string_vector(StashGroup *group, gchar ***setting,
                const gchar *key_name, const gchar **default_value)
{
        add_pref(group, G_TYPE_STRV, setting, key_name, (gpointer)default_value);
}


/* *** GTK-related functions *** */

static void handle_toggle_button(GtkWidget *widget, gboolean *setting,
                PrefAction action)
{
        switch (action)
        {
                case PREF_DISPLAY:
                        gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(widget), *setting);
                        break;
                case PREF_UPDATE:
                        *setting = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
                        break;
        }
}


static void handle_spin_button(GtkWidget *widget, StashPref *entry,
                PrefAction action)
{
        gint *setting = entry->setting;

        g_assert(entry->setting_type == G_TYPE_INT);    /* only int spin prefs */

        switch (action)
        {
                case PREF_DISPLAY:
                        gtk_spin_button_set_value(GTK_SPIN_BUTTON(widget), *setting);
                        break;
                case PREF_UPDATE:
                        /* if the widget is focussed, the value might not be updated */
                        gtk_spin_button_update(GTK_SPIN_BUTTON(widget));
                        *setting = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(widget));
                        break;
        }
}


static void handle_combo_box(GtkWidget *widget, StashPref *entry,
                PrefAction action)
{
        gint *setting = entry->setting;

        switch (action)
        {
                case PREF_DISPLAY:
                        gtk_combo_box_set_active(GTK_COMBO_BOX(widget), *setting);
                        break;
                case PREF_UPDATE:
                        *setting = gtk_combo_box_get_active(GTK_COMBO_BOX(widget));
                        break;
        }
}


static void handle_entry(GtkWidget *widget, StashPref *entry,
                PrefAction action)
{
        gchararray *setting = entry->setting;

        switch (action)
        {
                case PREF_DISPLAY:
                        gtk_entry_set_text(GTK_ENTRY(widget), *setting);
                        break;
                case PREF_UPDATE:
                        g_free(*setting);
                        *setting = g_strdup(gtk_entry_get_text(GTK_ENTRY(widget)));
                        break;
        }
}


static void handle_combo_box_entry(GtkWidget *widget, StashPref *entry,
                PrefAction action)
{
        widget = gtk_bin_get_child(GTK_BIN(widget));
        handle_entry(widget, entry, action);
}


/* taken from Glade 2.x generated support.c */
static GtkWidget*
lookup_widget(GtkWidget *widget, const gchar *widget_name)
{
        GtkWidget *parent, *found_widget;

        g_return_val_if_fail(widget != NULL, NULL);
        g_return_val_if_fail(widget_name != NULL, NULL);

        for (;;)
        {
                if (GTK_IS_MENU(widget))
                        parent = gtk_menu_get_attach_widget(GTK_MENU(widget));
                else
                        parent = gtk_widget_get_parent(widget);
                if (parent == NULL)
                        parent = (GtkWidget*) g_object_get_data(G_OBJECT(widget), "GladeParentKey");
                if (parent == NULL)
                        break;
                widget = parent;
        }

        found_widget = (GtkWidget*) g_object_get_data(G_OBJECT(widget), widget_name);
        if (G_UNLIKELY(found_widget == NULL))
                g_warning("Widget not found: %s", widget_name);
        return found_widget;
}


static GtkWidget *
get_widget(GtkWidget *owner, StashWidgetID widget_id)
{
        GtkWidget *widget;

        if (owner)
                widget = lookup_widget(owner, (const gchar *)widget_id);
        else
                widget = (GtkWidget *)widget_id;

        if (!GTK_IS_WIDGET(widget))
        {
                g_warning("Unknown widget in %s()!", G_STRFUNC);
                return NULL;
        }
        return widget;
}


static void handle_radio_button(GtkWidget *widget, gint enum_id, gboolean *setting,
                PrefAction action)
{
        switch (action)
        {
                case PREF_DISPLAY:
                        if (*setting == enum_id)
                                gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(widget), TRUE);
                        break;
                case PREF_UPDATE:
                        if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget)))
                                *setting = enum_id;
                        break;
        }
}


static void handle_radio_buttons(GtkWidget *owner, StashPref *entry,
                PrefAction action)
{
        EnumWidget *field = entry->extra.radio_buttons;
        gsize count = 0;
        GtkWidget *widget = NULL;

        while (1)
        {
                widget = get_widget(owner, field->widget_id);

                if (!widget)
                        continue;

                count++;
                handle_radio_button(widget, field->enum_id, entry->setting, action);
                field++;
                if (!field->widget_id)
                        break;
        }
        if (g_slist_length(gtk_radio_button_get_group(GTK_RADIO_BUTTON(widget))) != count)
                g_warning("Missing/invalid radio button widget IDs found!");
}


static void handle_widget_property(GtkWidget *widget, StashPref *entry,
                PrefAction action)
{
        GObject *object = G_OBJECT(widget);
        const gchar *name = entry->extra.property_name;

        switch (action)
        {
                case PREF_DISPLAY:
                        g_object_set(object, name, entry->setting, NULL);
                        break;
                case PREF_UPDATE:
                        if (entry->setting_type == G_TYPE_STRING)
                                g_free(entry->setting);
                        /* TODO: Which other types need freeing here? */

                        g_object_get(object, name, entry->setting, NULL);
                        break;
        }
}


static void pref_action(PrefAction action, StashGroup *group, GtkWidget *owner)
{
        StashPref *entry;
        guint i;

        foreach_ptr_array(entry, i, group->entries)
        {
                GtkWidget *widget;

                /* ignore settings with no widgets */
                if (entry->widget_type == G_TYPE_NONE)
                        continue;

                /* radio buttons have several widgets */
                if (entry->widget_type == GTK_TYPE_RADIO_BUTTON)
                {
                        handle_radio_buttons(owner, entry, action);
                        continue;
                }

                widget = get_widget(owner, entry->widget_id);
                if (!widget)
                {
                        g_warning("Unknown widget for %s::%s in %s()!", group->name, entry->key_name,
                                G_STRFUNC);
                        continue;
                }

                /* note: can't use switch for GTK_TYPE macros */
                if (entry->widget_type == GTK_TYPE_TOGGLE_BUTTON)
                        handle_toggle_button(widget, entry->setting, action);
                else if (entry->widget_type == GTK_TYPE_SPIN_BUTTON)
                        handle_spin_button(widget, entry, action);
                else if (entry->widget_type == GTK_TYPE_COMBO_BOX)
                        handle_combo_box(widget, entry, action);
                else if (entry->widget_type == TYPE_COMBO_BOX_ENTRY)
                        handle_combo_box_entry(widget, entry, action);
                else if (entry->widget_type == GTK_TYPE_ENTRY)
                        handle_entry(widget, entry, action);
                else if (entry->widget_type == G_TYPE_PARAM)
                        handle_widget_property(widget, entry, action);
                else
                        g_warning("Unhandled type for %s::%s in %s()!", group->name, entry->key_name,
                                G_STRFUNC);
        }
}


/** Applies Stash settings to widgets, usually called before displaying the widgets.
 * The @a owner argument depends on which type you use for @ref StashWidgetID.
 * @param group .
 * @param owner If non-NULL, used to lookup widgets by name, otherwise
 * widget pointers are assumed.
 * @see stash_group_update(). */
void stash_group_display(StashGroup *group, GtkWidget *owner)
{
        pref_action(PREF_DISPLAY, group, owner);
}


/** Applies widget values to Stash settings, usually called after displaying the widgets.
 * The @a owner argument depends on which type you use for @ref StashWidgetID.
 * @param group .
 * @param owner If non-NULL, used to lookup widgets by name, otherwise
 * widget pointers are assumed.
 * @see stash_group_display(). */
void stash_group_update(StashGroup *group, GtkWidget *owner)
{
        pref_action(PREF_UPDATE, group, owner);
}


static StashPref *
add_widget_pref(StashGroup *group, GType setting_type, gpointer setting,
                const gchar *key_name, gpointer default_value,
                GType widget_type, StashWidgetID widget_id)
{
        StashPref *entry =
                add_pref(group, setting_type, setting, key_name, default_value);

        entry->widget_type = widget_type;
        entry->widget_id = widget_id;
        return entry;
}


/** Adds a @c GtkToggleButton (or @c GtkCheckButton) widget pref.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Value to use if the key doesn't exist when loading.
 * @param widget_id @c GtkWidget pointer or string to lookup widget later.
 * @see stash_group_add_radio_buttons(). */
void stash_group_add_toggle_button(StashGroup *group, gboolean *setting,
                const gchar *key_name, gboolean default_value, StashWidgetID widget_id)
{
        add_widget_pref(group, G_TYPE_BOOLEAN, setting, key_name, GINT_TO_POINTER(default_value),
                GTK_TYPE_TOGGLE_BUTTON, widget_id);
}


/** Adds a @c GtkRadioButton widget group pref.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Value to use if the key doesn't exist when loading.
 * @param widget_id @c GtkWidget pointer or string to lookup widget later.
 * @param enum_id Enum value for @a widget_id.
 * @param ... pairs of @a widget_id, @a enum_id.
 * Example (using widget lookup strings, but widget pointers can also work):
 * @code
 * enum {FOO, BAR};
 * stash_group_add_radio_buttons(group, &which_one_setting, "which_one", BAR,
 *      "radio_foo", FOO, "radio_bar", BAR, NULL);
 * @endcode */
void stash_group_add_radio_buttons(StashGroup *group, gint *setting,
                const gchar *key_name, gint default_value,
                StashWidgetID widget_id, gint enum_id, ...)
{
        StashPref *entry =
                add_widget_pref(group, G_TYPE_INT, setting, key_name, GINT_TO_POINTER(default_value),
                        GTK_TYPE_RADIO_BUTTON, NULL);
        va_list args;
        gsize count = 1;
        EnumWidget *item, *array;

        /* count pairs of args */
        va_start(args, enum_id);
        while (1)
        {
                if (!va_arg(args, gpointer))
                        break;
                va_arg(args, gint);
                count++;
        }
        va_end(args);

        array = g_new0(EnumWidget, count + 1);
        entry->extra.radio_buttons = array;

        va_start(args, enum_id);
        foreach_c_array(item, array, count)
        {
                if (item == array)
                {
                        /* first element */
                        item->widget_id = widget_id;
                        item->enum_id = enum_id;
                }
                else
                {
                        item->widget_id = va_arg(args, gpointer);
                        item->enum_id = va_arg(args, gint);
                }
        }
        va_end(args);
}


/** Adds a @c GtkSpinButton widget pref.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Value to use if the key doesn't exist when loading.
 * @param widget_id @c GtkWidget pointer or string to lookup widget later. */
void stash_group_add_spin_button_integer(StashGroup *group, gint *setting,
                const gchar *key_name, gint default_value, StashWidgetID widget_id)
{
        add_widget_pref(group, G_TYPE_INT, setting, key_name, GINT_TO_POINTER(default_value),
                GTK_TYPE_SPIN_BUTTON, widget_id);
}


/** Adds a @c GtkComboBox widget pref.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Value to use if the key doesn't exist when loading.
 * @param widget_id @c GtkWidget pointer or string to lookup widget later.
 * @see stash_group_add_combo_box_entry(). */
void stash_group_add_combo_box(StashGroup *group, gint *setting,
                const gchar *key_name, gint default_value, StashWidgetID widget_id)
{
        add_widget_pref(group, G_TYPE_INT, setting, key_name, GINT_TO_POINTER(default_value),
                GTK_TYPE_COMBO_BOX, widget_id);
}


/** Adds a @c GtkComboBoxEntry widget pref.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Value to use if the key doesn't exist when loading.
 * @param widget_id @c GtkWidget pointer or string to lookup widget later. */
/* We could maybe also have something like stash_group_add_combo_box_entry_with_menu()
 * for the history list - or should that be stored as a separate setting? */
void stash_group_add_combo_box_entry(StashGroup *group, gchar **setting,
                const gchar *key_name, const gchar *default_value, StashWidgetID widget_id)
{
        add_widget_pref(group, G_TYPE_STRING, setting, key_name, (gpointer)default_value,
                TYPE_COMBO_BOX_ENTRY, widget_id);
}


/** Adds a @c GtkEntry widget pref.
 * @param group .
 * @param setting Address of setting variable.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Value to use if the key doesn't exist when loading.
 * @param widget_id @c GtkWidget pointer or string to lookup widget later. */
void stash_group_add_entry(StashGroup *group, gchar **setting,
                const gchar *key_name, const gchar *default_value, StashWidgetID widget_id)
{
        add_widget_pref(group, G_TYPE_STRING, setting, key_name, (gpointer)default_value,
                GTK_TYPE_ENTRY, widget_id);
}


static GType object_get_property_type(GObject *object, const gchar *property_name)
{
        GObjectClass *klass = G_OBJECT_GET_CLASS(object);
        GParamSpec *ps;

        ps = g_object_class_find_property(klass, property_name);
        return ps->value_type;
}


/** Adds a widget's read/write property to the stash group.
 * The property will be set when calling
 * stash_group_display(), and read when calling stash_group_update().
 * @param group .
 * @param setting Address of e.g. an integer if using an integer property.
 * @param key_name Name for key in a @c GKeyFile.
 * @param default_value Value to use if the key doesn't exist when loading.
 * Should be cast into a pointer e.g. with @c GINT_TO_POINTER().
 * @param widget_id @c GtkWidget pointer or string to lookup widget later.
 * @param property_name .
 * @param type can be @c 0 if passing a @c GtkWidget as the @a widget_id argument to look it up from the
 * @c GObject data.
 * @warning Currently only string GValue properties will be freed before setting; patch for
 * other types - see @c handle_widget_property(). */
void stash_group_add_widget_property(StashGroup *group, gpointer setting,
                const gchar *key_name, gpointer default_value, StashWidgetID widget_id,
                const gchar *property_name, GType type)
{
        if (!type)
                type = object_get_property_type(G_OBJECT(widget_id), property_name);

        add_widget_pref(group, type, setting, key_name, default_value,
                G_TYPE_PARAM, widget_id)->extra.property_name = property_name;
}


enum
{
        STASH_TREE_NAME,
        STASH_TREE_VALUE,
        STASH_TREE_COUNT
};


struct StashTreeValue
{
        const gchar *group_name;
        StashPref *pref;
        union
        {
                gchararray tree_string;
                gint tree_int;
        } data;
};

typedef struct StashTreeValue StashTreeValue;


static void stash_tree_renderer_set_data(GtkCellLayout *cell_layout, GtkCellRenderer *cell,
        GtkTreeModel *model, GtkTreeIter *iter, gpointer user_data)
{
        GType cell_type = GPOINTER_TO_SIZE(user_data);
        StashTreeValue *value;
        StashPref *pref;
        gboolean matches_type;

        gtk_tree_model_get(model, iter, STASH_TREE_VALUE, &value, -1);
        pref = value->pref;
        matches_type = pref->setting_type == cell_type;
        g_object_set(cell, "visible", matches_type, "sensitive", matches_type,
                cell_type == G_TYPE_BOOLEAN ? "activatable" : "editable", matches_type, NULL);

        if (matches_type)
        {
                switch (pref->setting_type)
                {
                        case G_TYPE_BOOLEAN:
                                g_object_set(cell, "active", value->data.tree_int, NULL);
                                break;
                        case G_TYPE_INT:
                        {
                                gchar *text = g_strdup_printf("%d", value->data.tree_int);
                                g_object_set(cell, "text", text, NULL);
                                g_free(text);
                                break;
                        }
                        case G_TYPE_STRING:
                                g_object_set(cell, "text", value->data.tree_string, NULL);
                                break;
                }
        }
}


static void stash_tree_renderer_edited(gchar *path_str, gchar *new_text, GtkTreeModel *model)
{
        GtkTreePath *path;
        GtkTreeIter iter;
        StashTreeValue *value;
        StashPref *pref;

        path = gtk_tree_path_new_from_string(path_str);
        gtk_tree_model_get_iter(model, &iter, path);
        gtk_tree_model_get(model, &iter, STASH_TREE_VALUE, &value, -1);
        pref = value->pref;

        switch (pref->setting_type)
        {
                case G_TYPE_BOOLEAN:
                        value->data.tree_int = !value->data.tree_int;
                        break;
                case G_TYPE_INT:
                        value->data.tree_int = atoi(new_text);
                        break;
                case G_TYPE_STRING:
                        SETPTR(value->data.tree_string, g_strdup(new_text));
                        break;
        }

        gtk_tree_model_row_changed(model, path, &iter);
        gtk_tree_path_free(path);
}


static void stash_tree_boolean_toggled(GtkCellRendererToggle *cell, gchar *path_str,
        GtkTreeModel *model)
{
        stash_tree_renderer_edited(path_str, NULL, model);
}


static void stash_tree_string_edited(GtkCellRenderer *cell, gchar *path_str, gchar *new_text,
        GtkTreeModel *model)
{
        stash_tree_renderer_edited(path_str, new_text, model);
}


static gboolean stash_tree_discard_value(GtkTreeModel *model, GtkTreePath *path,
        GtkTreeIter *iter, gpointer user_data)
{
        StashTreeValue *value;

        gtk_tree_model_get(model, iter, STASH_TREE_VALUE, &value, -1);
        if (value->pref->setting_type == G_TYPE_STRING)
                g_free(value->data.tree_string);
        g_free(value);

        return FALSE;
}


static void stash_tree_destroy_cb(GtkWidget *widget, gpointer user_data)
{
        GtkTreeModel *model = gtk_tree_view_get_model(GTK_TREE_VIEW(widget));
        gtk_tree_model_foreach(model, stash_tree_discard_value, NULL);
}


static void stash_tree_append_pref(StashGroup *group, StashPref *entry, GtkListStore *store,
        PrefAction action)
{
        GtkTreeIter iter;
        StashTreeValue *value;

        value = g_new0(StashTreeValue, 1);

        value->group_name = group->name;
        value->pref = entry;

        gtk_list_store_append(store, &iter);
        gtk_list_store_set(store, &iter, STASH_TREE_NAME, entry->key_name,
                STASH_TREE_VALUE, value, -1);
}


static void stash_tree_append_prefs(GPtrArray *group_array,
        GtkListStore *store, PrefAction action)
{
        StashGroup *group;
        guint i, j;
        StashPref *entry;

        foreach_ptr_array(group, i, group_array)
        {
                if (group->various)
                {
                        foreach_ptr_array(entry, j, group->entries)
                                stash_tree_append_pref(group, entry, store, action);
                }
        }
}


/* Setups a simple editor for stash preferences based on the widget arguments.
 * group_array - Array of groups which's settings will be edited.
 * tree - GtkTreeView in which to edit the preferences. Must be empty. */
void stash_tree_setup(GPtrArray *group_array, GtkTreeView *tree)
{
        GtkListStore *store;
        GtkTreeModel *model;
        GtkCellRenderer *cell;
        GtkTreeViewColumn *column;
        GtkAdjustment *adjustment;

        store = gtk_list_store_new(STASH_TREE_COUNT, G_TYPE_STRING, G_TYPE_POINTER);
        stash_tree_append_prefs(group_array, store, PREF_DISPLAY);
        gtk_tree_sortable_set_sort_column_id(GTK_TREE_SORTABLE(store), STASH_TREE_NAME,
                GTK_SORT_ASCENDING);

        model = GTK_TREE_MODEL(store);
        gtk_tree_view_set_model(tree, model);
        g_object_unref(G_OBJECT(store));
        g_signal_connect(tree, "destroy", G_CALLBACK(stash_tree_destroy_cb), NULL);

        cell = gtk_cell_renderer_text_new();
        column = gtk_tree_view_column_new_with_attributes(_("Name"), cell, "text",
                STASH_TREE_NAME, NULL);
        gtk_tree_view_column_set_sort_column_id(column, STASH_TREE_NAME);
        gtk_tree_view_column_set_sort_indicator(column, TRUE);
        gtk_tree_view_append_column(tree, column);

        column = gtk_tree_view_column_new();
        gtk_tree_view_column_set_title(column, _("Value"));
        gtk_tree_view_append_column(tree, column);
        /* boolean renderer */
        cell = gtk_cell_renderer_toggle_new();
        g_signal_connect(cell, "toggled", G_CALLBACK(stash_tree_boolean_toggled), model);
        gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(column), cell, FALSE);
        gtk_cell_layout_set_cell_data_func(GTK_CELL_LAYOUT(column), cell,
                stash_tree_renderer_set_data, GSIZE_TO_POINTER(G_TYPE_BOOLEAN), NULL);
        /* string renderer */
        cell = gtk_cell_renderer_text_new();
        g_object_set(cell, "ellipsize", PANGO_ELLIPSIZE_END, NULL);
        g_signal_connect(cell, "edited", G_CALLBACK(stash_tree_string_edited), model);
        gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(column), cell, TRUE);
        gtk_cell_layout_set_cell_data_func(GTK_CELL_LAYOUT(column), cell,
                stash_tree_renderer_set_data, GSIZE_TO_POINTER(G_TYPE_STRING), NULL);
        /* integer renderer */
        cell = gtk_cell_renderer_spin_new();
        adjustment = GTK_ADJUSTMENT(gtk_adjustment_new(0, G_MININT, G_MAXINT, 1, 10, 0));
        g_object_set(cell, "adjustment", adjustment, NULL);
        g_signal_connect(cell, "edited", G_CALLBACK(stash_tree_string_edited), model);
        gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(column), cell, FALSE);
        gtk_cell_layout_set_cell_data_func(GTK_CELL_LAYOUT(column), cell,
                stash_tree_renderer_set_data, GSIZE_TO_POINTER(G_TYPE_INT), NULL);
}


static void stash_tree_display_pref(StashTreeValue *value, StashPref *entry)
{
        switch (entry->setting_type)
        {
                case G_TYPE_BOOLEAN:
                        value->data.tree_int = *(gboolean *) entry->setting;
                        break;
                case G_TYPE_INT:
                        value->data.tree_int = *(gint *) entry->setting;
                        break;
                case G_TYPE_STRING:
                        SETPTR(value->data.tree_string, g_strdup(*(gchararray *) entry->setting));
                        break;
                default:
                        g_warning("Unhandled type for %s::%s in %s()!", value->group_name,
                                entry->key_name, G_STRFUNC);
        }
}


static void stash_tree_update_pref(StashTreeValue *value, StashPref *entry)
{
        switch (entry->setting_type)
        {
                case G_TYPE_BOOLEAN:
                        *(gboolean *) entry->setting = value->data.tree_int;
                        break;
                case G_TYPE_INT:
                        *(gint *) entry->setting = value->data.tree_int;
                        break;
                case G_TYPE_STRING:
                {
                        gchararray *text = entry->setting;
                        SETPTR(*text, g_strdup(value->data.tree_string));
                        break;
                }
                default:
                        g_warning("Unhandled type for %s::%s in %s()!", value->group_name,
                                entry->key_name, G_STRFUNC);
        }
}


static void stash_tree_action(GtkTreeModel *model, PrefAction action)
{
        GtkTreeIter iter;
        gboolean valid = gtk_tree_model_get_iter_first(model, &iter);
        StashTreeValue *value;

        while (valid)
        {
                gtk_tree_model_get(model, &iter, STASH_TREE_VALUE, &value, -1);

                switch (action)
                {
                        case PREF_DISPLAY:
                                stash_tree_display_pref(value, value->pref);
                                break;
                        case PREF_UPDATE:
                                stash_tree_update_pref(value, value->pref);
                                break;
                }
                valid = gtk_tree_model_iter_next(model, &iter);
        }
}


void stash_tree_display(GtkTreeView *tree)
{
        stash_tree_action(gtk_tree_view_get_model(tree), PREF_DISPLAY);
}


void stash_tree_update(GtkTreeView *tree)
{
        stash_tree_action(gtk_tree_view_get_model(tree), PREF_UPDATE);
}