## rb-util rb-util — assorted utility functions |

## Synopsis

    #define             FFWD_OFFSET
    #define             RWD_OFFSET
    #define             RB_CHAIN_GOBJECT_METHOD             (klass,
                                                             method,
                                                             instance)
    gboolean            rb_true_function                    (gpointer dummy);
    gboolean            rb_false_function                   (gpointer dummy);
    gpointer            rb_null_function                    (gpointer dummy);
    gpointer            rb_copy_function                    (gpointer data);
    int                 rb_gvalue_compare                   (GValue *a,
                                                             GValue *b);
    int                 rb_compare_gtimeval                 (GTimeVal *a,
                                                             GTimeVal *b);
    int                 rb_safe_strcmp                      (const char *a,
                                                             const char *b);
    char *              rb_make_time_string                 (guint seconds);
    char *              rb_make_duration_string             (guint duration);
    char *              rb_make_elapsed_time_string         (guint elapsed,
                                                             guint duration,
                                                             gboolean show_remaining);
    GtkWidget *         rb_image_new_from_stock             (const gchar *stock_id,
                                                             GtkIconSize size);
    void                rb_threads_init                     (void);
    gboolean            rb_is_main_thread                   (void);
    gchar *             rb_search_fold                      (const char *original);
    gchar **            rb_string_split_words               (const gchar *string);
    gboolean            rb_string_list_equal                (GList *a,
                                                             GList *b);
    gboolean            rb_string_list_contains             (GList *list,
                                                             const char *s);
    GList *             rb_string_list_copy                 (GList *list);
    void                rb_list_deep_free                   (GList *list);
    void                rb_list_destroy_free                (GList *list,
                                                             GDestroyNotify destroyer);
    void                rb_slist_deep_free                  (GSList *list);
    gboolean            rb_str_in_strv                      (const char *needle,
                                                             const char **haystack);
    GList *             rb_collate_hash_table_keys          (GHashTable *table);
    GList *             rb_collate_hash_table_values        (GHashTable *table);
    GList *             rb_uri_list_parse                   (const char *uri_list);
    gboolean            rb_signal_accumulator_object_handled
                                                            (GSignalInvocationHint *hint,
                                                             GValue *return_accu,
                                                             const GValue *handler_return,
                                                             gpointer dummy);
    gboolean            rb_signal_accumulator_value_handled (GSignalInvocationHint *hint,
                                                             GValue *return_accu,
                                                             const GValue *handler_return,
                                                             gpointer dummy);
    gboolean            rb_signal_accumulator_boolean_or    (GSignalInvocationHint *hint,
                                                             GValue *return_accu,
                                                             const GValue *handler_return,
                                                             gpointer dummy);
    gboolean            rb_signal_accumulator_value_array   (GSignalInvocationHint *hint,
                                                             GValue *return_accu,
                                                             const GValue *handler_return,
                                                             gpointer dummy);
    void                rb_value_array_append_data          (GArray *array,
                                                             GType type,
                                                             ...);
    void                rb_value_free                       (GValue *val);
    void                rb_assert_locked                    (GMutex *mutex);
    void                rb_set_tree_view_column_fixed_width (GtkWidget *treeview,
                                                             GtkTreeViewColumn *column,
                                                             GtkCellRenderer *renderer,
                                                             const char **strings,
                                                             int padding);
    GdkPixbuf *         rb_scale_pixbuf_to_size             (GdkPixbuf *pixbuf,
                                                             GtkIconSize size);
    void                (*RBDelayedSyncFunc)                (GSettings *settings,
                                                             gpointer data);
    void                rb_settings_delayed_sync            (GSettings *settings,
                                                             RBDelayedSyncFunc sync_func,
                                                             gpointer data,
                                                             GDestroyNotify destroy);
    void                rb_menu_update_link                 (GMenu *menu,
                                                             const char *link_attr,
                                                             GMenuModel *target);

## Description

This is a dumping ground for utility functions that may or may not be generally useful in Rhythmbox or elsewhere. Things end up here if they're clever or if they're used all over the place.

## Details

### FFWD_OFFSET

    #define FFWD_OFFSET 20

### RWD_OFFSET

    #define RWD_OFFSET 10

### RB_CHAIN_GOBJECT_METHOD()

    #define             RB_CHAIN_GOBJECT_METHOD(klass, method, instance)

### rb_true_function ()

    gboolean            rb_true_function                    (gpointer dummy);

Just returns `TRUE`, useful as a callback function.

`dummy` : | unused
Returns : | `TRUE`

### rb_false_function ()

    gboolean            rb_false_function                   (gpointer dummy);

Just returns `FALSE`, useful as a callback function.

`dummy` : | unused
Returns : | `FALSE`

### rb_null_function ()

    gpointer            rb_null_function                    (gpointer dummy);

Just returns NULL. Useful as a callback function.

`dummy` : | unused
Returns : | NULL

### rb_copy_function ()

    gpointer            rb_copy_function                    (gpointer data);

Just returns its first argument. Useful as a callback function.

`data` : | generic argument
Returns : | `data`

### rb_gvalue_compare ()

    int                 rb_gvalue_compare                   (GValue *a,
                                                             GValue *b);

Compares `a` and `b` for sorting. `a` and `b` must contain the same value type for the comparison to be valid. Comparisons for some value types are not particularly useful.

`a` : | left hand side
`b` : | right hand size
Returns : | -1 if `a` < `b`, 0 if `a` == `b`, 1 if `a` > `b`

### rb_compare_gtimeval ()

    int                 rb_compare_gtimeval                 (GTimeVal *a,
                                                             GTimeVal *b);

Compares two GTimeVal structures for sorting.

`a` : | left hand side
`b` : | right hand size
Returns : | -1 if `a` < `b`, 0 if `a` == `b`, 1 if `a` > `b`

### rb_safe_strcmp ()

    int                 rb_safe_strcmp                      (const char *a,
                                                             const char *b);

### rb_make_time_string ()

    char *              rb_make_time_string                 (guint seconds);

Constructs a string describing the specified time.

`seconds` : | time in seconds
Returns : | time string. [transfer full]

### rb_make_duration_string ()

    char *              rb_make_duration_string             (guint duration);

Constructs a string describing the specified duration. The string describes hours, minutes, and seconds, and its format is localised.

`duration` : | duration in seconds
Returns : | duration string. [transfer full]

### rb_make_elapsed_time_string ()

    char *              rb_make_elapsed_time_string         (guint elapsed,
                                                             guint duration,
                                                             gboolean show_remaining);

Constructs a string describing a playback position. The string describes hours, minutes, and seconds, and its format is localised. The string can describe either the elapsed time or the time remaining.

`elapsed` : | elapsed time (in seconds)
`duration` : | duration (in seconds)
`show_remaining` : | if `TRUE`, show the remaining time, otherwise show elapsed time
Returns : | elapsed/remaining time string. [transfer full]

### rb_image_new_from_stock ()

    GtkWidget *         rb_image_new_from_stock             (const gchar *stock_id,
                                                             GtkIconSize size);

Same as `gtk_image_new_from_stock` except that it mirrors the icons for RTL languages.

`stock_id` : | stock image id
`size` : | requested icon size
Returns : | a GtkImage of the requested stock item. [transfer full]

### rb_threads_init ()

    void                rb_threads_init                     (void);

Initializes various thread helpers. Must be called on startup.

### rb_is_main_thread ()

    gboolean            rb_is_main_thread                   (void);

Checks if currently executing on the main thread.

Returns : | `TRUE` if on the main thread

### rb_search_fold ()

    gchar *             rb_search_fold                      (const char *original);

Returns a case-folded and punctuation-stripped version of `original`, useful for performing text searches.

`original` : | the string to fold
Returns : | case-folded string. [transfer full]

### rb_string_split_words ()

    gchar **            rb_string_split_words               (const gchar *string);

Splits `string` on word boundaries using Unicode character definitions.

`string` : | the string to split
Returns : | NULL-terminated array of strings. [array zero-terminated=1][transfer full]

### rb_string_list_equal ()

    gboolean            rb_string_list_equal                (GList *a,
                                                             GList *b);

Checks if `a` and `b` contain exactly the same set of strings, regardless of order.

`a` : | list of strings to compare. [element-type utf8]
`b` : | other list of strings to compare. [element-type utf8]
Returns : | `TRUE` if the lists contain all the same strings

### rb_string_list_contains ()

    gboolean            rb_string_list_contains             (GList *list,
                                                             const char *s);

Checks if `list` contains the string `s`.

`list` : | (element-type utf8) list to check
`s` : | string to check for
Returns : | `TRUE` if found

### rb_string_list_copy ()

    GList *             rb_string_list_copy                 (GList *list);

Creates a deep copy of `list`.

`list` : | list of strings to copy. [element-type utf8]
Returns : | copied list. [element-type utf8][transfer full]

### rb_list_deep_free ()

    void                rb_list_deep_free                   (GList *list);

Frees each element of `list` and `list` itself.

`list` : | list to free. [element-type any][transfer full]

### rb_list_destroy_free ()

    void                rb_list_destroy_free                (GList *list,
                                                             GDestroyNotify destroyer);

Calls `destroyer` for each element in `list`, then frees `list`.

`list` : | list to destroy
`destroyer` : | function to call to free elements of `list`

### rb_slist_deep_free ()

    void                rb_slist_deep_free                  (GSList *list);

Frees each element of `list` and `list` itself.

`list` : | list to free. [element-type any][transfer full]

### rb_str_in_strv ()

    gboolean            rb_str_in_strv                      (const char *needle,
                                                             const char **haystack);

Checks if `needle` is present in the NULL-terminated string array `haystack`.

`needle` : | string to search for
`haystack` : | array of strings to search
Returns : | `TRUE` if found

### rb_collate_hash_table_keys ()

    GList *             rb_collate_hash_table_keys          (GHashTable *table);

Returns a GList containing all keys from `table`. The keys are not copied.

`table` : | GHashTable to collate
Returns : | GList of keys. [element-type any][transfer container]

### rb_collate_hash_table_values ()

    GList *             rb_collate_hash_table_values        (GHashTable *table);

Returns a GList containing all values from `table`. The values are not copied.

`table` : | GHashTable to collate
Returns : | GList of values. [element-type any][transfer container]

### rb_uri_list_parse ()

    GList *             rb_uri_list_parse                   (const char *uri_list);

Converts a single string containing a list of URIs into a GList of URI strings.

`uri_list` : | string containing URIs to parse
Returns : | GList of URI strings. [element-type utf8][transfer full]

### rb_signal_accumulator_object_handled ()

    gboolean            rb_signal_accumulator_object_handled
                                                            (GSignalInvocationHint *hint,
                                                             GValue *return_accu,
                                                             const GValue *handler_return,
                                                             gpointer dummy);

A GSignalAccumulator that aborts the signal emission after the first handler to return a value, and returns the value returned by that handler. This is the opposite behaviour from what you get when no accumulator is specified, where the last signal handler wins.

`hint` : | a GSignalInvocationHint
`return_accu` : | holds the accumulated return value
`handler_return` : | holds the return value to be accumulated
`dummy` : | user data (unused)
Returns : | `FALSE` to abort signal emission, `TRUE` to continue

### rb_signal_accumulator_value_handled ()

    gboolean            rb_signal_accumulator_value_handled (GSignalInvocationHint *hint,
                                                             GValue *return_accu,
                                                             const GValue *handler_return,
                                                             gpointer dummy);

A GSignalAccumulator that aborts the signal emission after the first handler to return a value, and returns the value returned by that handler. This is the opposite behaviour from what you get when no accumulator is specified, where the last signal handler wins.

`hint` : | a GSignalInvocationHint
`return_accu` : | holds the accumulated return value
`handler_return` : | holds the return value to be accumulated
`dummy` : | user data (unused)
Returns : | `FALSE` to abort signal emission, `TRUE` to continue

### rb_signal_accumulator_boolean_or ()

    gboolean            rb_signal_accumulator_boolean_or    (GSignalInvocationHint *hint,
                                                             GValue *return_accu,
                                                             const GValue *handler_return,
                                                             gpointer dummy);

A GSignalAccumulator used to return the boolean OR of all returned (boolean) values.

`hint` : | a GSignalInvocationHint
`return_accu` : | holds the accumulated return value
`handler_return` : | holds the return value to be accumulated
`dummy` : | user data (unused)
Returns : | `FALSE` to abort signal emission, `TRUE` to continue

### rb_signal_accumulator_value_array ()

    gboolean            rb_signal_accumulator_value_array   (GSignalInvocationHint *hint,
                                                             GValue *return_accu,
                                                             const GValue *handler_return,
                                                             gpointer dummy);

A GSignalAccumulator used to combine all returned values into a GArray of GValue instances.

`hint` : | a GSignalInvocationHint
`return_accu` : | holds the accumulated return value
`handler_return` : | holds the return value to be accumulated
`dummy` : | user data (unused)
Returns : | `FALSE` to abort signal emission, `TRUE` to continue

### rb_value_array_append_data ()

    void                rb_value_array_append_data          (GArray *array,
                                                             GType type,
                                                             ...);

Appends a single value to `array`, collecting it from `Varargs`.

`array` : | GArray to append to
`type` : | GType of the value being appended

### rb_value_free ()

    void                rb_value_free                       (GValue *val);

Unsets and frees `val`. `val` must have been allocated using `g_slice_new` or `g_slice_new0`.

`val` : | a GValue. [transfer full]

### rb_assert_locked ()

    void                rb_assert_locked                    (GMutex *mutex);

Asserts that `mutex` is currently locked. Does not work with all mutex implementations.

`mutex` : | a GMutex

### rb_set_tree_view_column_fixed_width ()

    void                rb_set_tree_view_column_fixed_width (GtkWidget *treeview,
                                                             GtkTreeViewColumn *column,
                                                             GtkCellRenderer *renderer,
                                                             const char **strings,
                                                             int padding);

Sets a fixed size for a tree view column based on a set of strings to be displayed in the column.

`treeview` : | the GtkTreeView containing the column
`column` : | the GtkTreeViewColumn to size
`renderer` : | the GtkCellRenderer used in the column
`strings` : | a NULL-terminated set of strings to base the size on. [array zero-terminated=1]
`padding` : | a small amount of extra padding for the column

### rb_scale_pixbuf_to_size ()

    GdkPixbuf *         rb_scale_pixbuf_to_size             (GdkPixbuf *pixbuf,
                                                             GtkIconSize size);

Creates a new GdkPixbuf from the original one, for a target of size, respecting the aspect ratio of the image.

`pixbuf` : | the GdkPixbuf containing the original image
`size` : | a stock icon size
Returns : | scaled GdkPixbuf. [transfer full]

### RBDelayedSyncFunc ()

    void                (*RBDelayedSyncFunc)                (GSettings *settings,
                                                             gpointer data);

### rb_settings_delayed_sync ()

    void                rb_settings_delayed_sync            (GSettings *settings,
                                                             RBDelayedSyncFunc sync_func,
                                                             gpointer data,
                                                             GDestroyNotify destroy);

Synchronizes settings in the `settings` instance after 500ms has elapsed with no further changes.

`settings` : | GSettings instance
`sync_func` : | function to call. [allow-none]
`data` : | data to pass to `func`. [allow-none]
`destroy` : | function to use to free `data`. [allow-none]

### rb_menu_update_link ()

    void                rb_menu_update_link                 (GMenu *menu,
                                                             const char *link_attr,
                                                             GMenuModel *target);

Updates a submenu link to point to the specified target menu.

`menu` : | menu to update
`link_attr` : | attribute indicating the menu link to update
`target` : | new menu link target