## e-cal-util

e-cal-util — Various utility functions.

## Synopsis

                        CalObjInstance;
    void                cal_obj_instance_list_free          (GList *list);
    enum                CalObjModType;
    enum                CalMode;
    #define             cal_mode_to_corba                   (mode)
    void                cal_obj_uid_list_free               (GList *list);
    icalcomponent *     e_cal_util_new_top_level            (void);
    icalcomponent *     e_cal_util_new_component            (icalcomponent_kind kind);
    icalcomponent *     e_cal_util_parse_ics_string         (const gchar *string);
    icalcomponent *     e_cal_util_parse_ics_file           (const gchar *filename);
    ECalComponentAlarms * e_cal_util_generate_alarms_for_comp
                                                            (ECalComponent *comp,
                                                             time_t start,
                                                             time_t end,
                                                             ECalComponentAlarmAction *omit,
                                                             ECalRecurResolveTimezoneFn resolve_tzid,
                                                             gpointer user_data,
                                                             icaltimezone *default_timezone);
    gint                e_cal_util_generate_alarms_for_list (GList *comps,
                                                             time_t start,
                                                             time_t end,
                                                             ECalComponentAlarmAction *omit,
                                                             GSList **comp_alarms,
                                                             ECalRecurResolveTimezoneFn resolve_tzid,
                                                             gpointer user_data,
                                                             icaltimezone *default_timezone);
    const gchar *       e_cal_util_priority_to_string       (gint priority);
    gint                e_cal_util_priority_from_string     (const gchar *string);
    void                e_cal_util_add_timezones_from_component
                                                            (icalcomponent *vcal_comp,
                                                             icalcomponent *icalcomp);
    gboolean            e_cal_util_component_is_instance    (icalcomponent *icalcomp);
    gboolean            e_cal_util_component_has_alarms     (icalcomponent *icalcomp);
    gboolean            e_cal_util_component_has_organizer  (icalcomponent *icalcomp);
    gboolean            e_cal_util_component_has_recurrences
                                                            (icalcomponent *icalcomp);
    gboolean            e_cal_util_component_has_rdates     (icalcomponent *icalcomp);
    gboolean            e_cal_util_component_has_rrules     (icalcomponent *icalcomp);
    gboolean            e_cal_util_component_has_attendee   (icalcomponent *icalcomp);
    gboolean            e_cal_util_event_dates_match        (icalcomponent *icalcomp1,
                                                             icalcomponent *icalcomp2);
    #define             CAL_STATIC_CAPABILITY_NO_ALARM_REPEAT
    #define             CAL_STATIC_CAPABILITY_NO_AUDIO_ALARMS
    #define             CAL_STATIC_CAPABILITY_NO_DISPLAY_ALARMS
    #define             CAL_STATIC_CAPABILITY_NO_EMAIL_ALARMS
    #define             CAL_STATIC_CAPABILITY_NO_PROCEDURE_ALARMS
    #define             CAL_STATIC_CAPABILITY_NO_TASK_ASSIGNMENT
    #define             CAL_STATIC_CAPABILITY_NO_THISANDFUTURE
    #define             CAL_STATIC_CAPABILITY_NO_THISANDPRIOR
    #define             CAL_STATIC_CAPABILITY_NO_TRANSPARENCY
    #define             CAL_STATIC_CAPABILITY_ONE_ALARM_ONLY
    #define             CAL_STATIC_CAPABILITY_ORGANIZER_MUST_ATTEND
    #define             CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS
    #define             CAL_STATIC_CAPABILITY_REMOVE_ALARMS
    #define             CAL_STATIC_CAPABILITY_CREATE_MESSAGES
    #define             CAL_STATIC_CAPABILITY_SAVE_SCHEDULES
    #define             CAL_STATIC_CAPABILITY_NO_CONV_TO_ASSIGN_TASK
    #define             CAL_STATIC_CAPABILITY_NO_CONV_TO_RECUR
    #define             CAL_STATIC_CAPABILITY_NO_GEN_OPTIONS
    #define             CAL_STATIC_CAPABILITY_REQ_SEND_OPTIONS
    #define             CAL_STATIC_CAPABILITY_RECURRENCES_NO_MASTER
    #define             CAL_STATIC_CAPABILITY_ORGANIZER_MUST_ACCEPT
    #define             CAL_STATIC_CAPABILITY_DELEGATE_SUPPORTED
    #define             CAL_STATIC_CAPABILITY_NO_ORGANIZER
    #define             CAL_STATIC_CAPABILITY_DELEGATE_TO_MANY
    #define             CAL_STATIC_CAPABILITY_HAS_UNACCEPTED_MEETING
    icalcomponent *     e_cal_util_construct_instance       (icalcomponent *icalcomp,
                                                             struct icaltimetype rid);
    void                e_cal_util_remove_instances         (icalcomponent *icalcomp,
                                                             struct icaltimetype rid,
                                                             CalObjModType mod);
    gchar *             e_cal_util_get_system_timezone_location
                                                            (void);
    icaltimezone *      e_cal_util_get_system_timezone      (void);

## Description

## Details

### CalObjInstance

    typedef struct {
    	gchar *uid;			/* UID of the object */
    	time_t start;			/* Start time of instance */
    	time_t end;			/* End time of instance */
    } CalObjInstance;

### cal_obj_instance_list_free ()

    void                cal_obj_instance_list_free          (GList *list);

Frees a list of CalObjInstance structures.

`list` : | List of CalObjInstance structures.

### enum CalObjModType

    typedef enum {
    	CALOBJ_MOD_THIS          = 1 << 0,
    	CALOBJ_MOD_THISANDPRIOR  = 1 << 1,
    	CALOBJ_MOD_THISANDFUTURE = 1 << 2,
    	CALOBJ_MOD_ALL           = 0x07
    } CalObjModType;

### enum CalMode

    typedef enum {
    	CAL_MODE_INVALID = -1,
    	CAL_MODE_LOCAL   = 1 << 0,
    	CAL_MODE_REMOTE  = 1 << 1,
    	CAL_MODE_ANY     = 0x07
    } CalMode;

### cal_mode_to_corba()

    #define             cal_mode_to_corba(mode)

`mode` : |

### cal_obj_uid_list_free ()

    void                cal_obj_uid_list_free               (GList *list);

Frees a list of unique identifiers for calendar objects.

`list` : | List of strings with unique identifiers.

### e_cal_util_new_top_level ()

    icalcomponent *     e_cal_util_new_top_level            (void);

Creates a new VCALENDAR component.

Returns : | the newly created top level component.

### e_cal_util_new_component ()

    icalcomponent *     e_cal_util_new_component            (icalcomponent_kind kind);

Creates a new icalcomponent of the specified kind.

`kind` : | Kind of the component to create.
Returns : | the newly created component.

### e_cal_util_parse_ics_string ()

    icalcomponent *     e_cal_util_parse_ics_string         (const gchar *string);

Parses an iCalendar string and returns a new icalcomponent representing that string. Note that this function deals with multiple VCALENDAR's in the string, something that Mozilla used to do and which libical does not support.

`string` : | iCalendar string to be parsed.
Returns : | a newly created icalcomponent or NULL if the string isn't a valid iCalendar string.

### e_cal_util_parse_ics_file ()

    icalcomponent *     e_cal_util_parse_ics_file           (const gchar *filename);

Parses the given file, and, if it contains a valid iCalendar object, parse it and return a new icalcomponent.

`filename` : | Name of the file to be parsed.
Returns : | a newly created icalcomponent or NULL if the file doesn't contain a valid iCalendar object.

### e_cal_util_generate_alarms_for_comp ()

    ECalComponentAlarms * e_cal_util_generate_alarms_for_comp
                                                            (ECalComponent *comp,
                                                             time_t start,
                                                             time_t end,
                                                             ECalComponentAlarmAction *omit,
                                                             ECalRecurResolveTimezoneFn resolve_tzid,
                                                             gpointer user_data,
                                                             icaltimezone *default_timezone);

Generates alarm instances for a calendar component. Returns the instances structure, or NULL if no alarm instances occurred in the specified time range.

`comp` : | The ECalComponent to generate alarms from.
`start` : | Start time.
`end` : | End time.
`omit` : | Alarm types to omit
`resolve_tzid` : | Callback for resolving timezones
`user_data` : | Data to be passed to the resolve_tzid callback
`default_timezone` : | The timezone used to resolve DATE and floating DATE-TIME values.
Returns : | a list of all the alarms found for the given component on the given time tange. The list of alarms should be freed by using the e_cal_component_free_alarm_list function.

### e_cal_util_generate_alarms_for_list ()

    gint                e_cal_util_generate_alarms_for_list (GList *comps,
                                                             time_t start,
                                                             time_t end,
                                                             ECalComponentAlarmAction *omit,
                                                             GSList **comp_alarms,
                                                             ECalRecurResolveTimezoneFn resolve_tzid,
                                                             gpointer user_data,
                                                             icaltimezone *default_timezone);

Iterates through all the components in the `comps` list and generates alarm instances for them; putting them in the `comp_alarms` list.

`comps` : | List of ECalComponent's.
`start` : | Start time.
`end` : | End time.
`omit` : | Alarm types to omit
`comp_alarms` : | List to be returned
`resolve_tzid` : | Callback for resolving timezones
`user_data` : | Data to be passed to the resolve_tzid callback
`default_timezone` : | The timezone used to resolve DATE and floating DATE-TIME values.
Returns : | the number of elements it added to the list.

### e_cal_util_priority_to_string ()

    const gchar *       e_cal_util_priority_to_string       (gint priority);

Converts an iCalendar PRIORITY value to a translated string. Any unknown priority value (i.e. not 0-9) will be returned as "" (undefined).

`priority` : | Priority value.
Returns : | a string representing the PRIORITY value. This value is a constant, so it should never be freed.

### e_cal_util_priority_from_string ()

    gint                e_cal_util_priority_from_string     (const gchar *string);

Converts a translated priority string to an iCalendar priority value.

`string` : | A string representing the PRIORITY value.
Returns : | the priority (0-9) or -1 if the priority string is not valid.

### e_cal_util_add_timezones_from_component ()

    void                e_cal_util_add_timezones_from_component
                                                            (icalcomponent *vcal_comp,
                                                             icalcomponent *icalcomp);

Adds VTIMEZONE components to a VCALENDAR for all tzid's in the given `icalcomp`.

`vcal_comp` : | A VCALENDAR component.
`icalcomp` : | An iCalendar component, of any type.

### e_cal_util_component_is_instance ()

    gboolean            e_cal_util_component_is_instance    (icalcomponent *icalcomp);

Checks whether an icalcomponent is an instance of a recurring appointment or not.

`icalcomp` : | An icalcomponent.
Returns : | TRUE if it is an instance, FALSE if not.

### e_cal_util_component_has_alarms ()

    gboolean            e_cal_util_component_has_alarms     (icalcomponent *icalcomp);

Checks whether an icalcomponent has any alarm.

`icalcomp` : | An icalcomponent.
Returns : | TRUE if it has alarms, FALSE otherwise.

### e_cal_util_component_has_organizer ()

    gboolean            e_cal_util_component_has_organizer  (icalcomponent *icalcomp);

Checks whether an icalcomponent has an organizer or not.

`icalcomp` : | An icalcomponent.
Returns : | TRUE if there is an organizer, FALSE if not.

### e_cal_util_component_has_recurrences ()

    gboolean            e_cal_util_component_has_recurrences
                                                            (icalcomponent *icalcomp);

Checks if an icalcomponent has recurrence dates or rules.

`icalcomp` : | An icalcomponent.
Returns : | TRUE if there are recurrence dates/rules, FALSE if not.

### e_cal_util_component_has_rdates ()

    gboolean            e_cal_util_component_has_rdates     (icalcomponent *icalcomp);

Checks if an icalcomponent has recurrence dates.

`icalcomp` : | An icalcomponent.
Returns : | TRUE if there are recurrence dates, FALSE if not.

### e_cal_util_component_has_rrules ()

    gboolean            e_cal_util_component_has_rrules     (icalcomponent *icalcomp);

Checks if an icalcomponent has recurrence rules.

`icalcomp` : | An icalcomponent.
Returns : | TRUE if there are recurrence rules, FALSE if not.

### e_cal_util_component_has_attendee ()

    gboolean            e_cal_util_component_has_attendee   (icalcomponent *icalcomp);

Checks if an icalcomponent has any attendees.

`icalcomp` : | An icalcomponent.
Returns : | TRUE if there are attendees, FALSE if not.

### e_cal_util_event_dates_match ()

    gboolean            e_cal_util_event_dates_match        (icalcomponent *icalcomp1,
                                                             icalcomponent *icalcomp2);

Compare the dates of two icalcomponent's to check if they match.

`icalcomp1` : | An icalcomponent.
`icalcomp2` : | An icalcomponent.
Returns : | TRUE if the dates of both components match, FALSE otherwise.

### CAL_STATIC_CAPABILITY_NO_ALARM_REPEAT

    #define CAL_STATIC_CAPABILITY_NO_ALARM_REPEAT             "no-alarm-repeat"

### CAL_STATIC_CAPABILITY_NO_AUDIO_ALARMS

    #define CAL_STATIC_CAPABILITY_NO_AUDIO_ALARMS             "no-audio-alarms"

### CAL_STATIC_CAPABILITY_NO_DISPLAY_ALARMS

    #define CAL_STATIC_CAPABILITY_NO_DISPLAY_ALARMS           "no-display-alarms"

### CAL_STATIC_CAPABILITY_NO_EMAIL_ALARMS

    #define CAL_STATIC_CAPABILITY_NO_EMAIL_ALARMS             "no-email-alarms"

### CAL_STATIC_CAPABILITY_NO_PROCEDURE_ALARMS

    #define CAL_STATIC_CAPABILITY_NO_PROCEDURE_ALARMS         "no-procedure-alarms"

### CAL_STATIC_CAPABILITY_NO_TASK_ASSIGNMENT

    #define CAL_STATIC_CAPABILITY_NO_TASK_ASSIGNMENT          "no-task-assignment"

### CAL_STATIC_CAPABILITY_NO_THISANDFUTURE

    #define CAL_STATIC_CAPABILITY_NO_THISANDFUTURE            "no-thisandfuture"

### CAL_STATIC_CAPABILITY_NO_THISANDPRIOR

    #define CAL_STATIC_CAPABILITY_NO_THISANDPRIOR             "no-thisandprior"

### CAL_STATIC_CAPABILITY_NO_TRANSPARENCY

    #define CAL_STATIC_CAPABILITY_NO_TRANSPARENCY             "no-transparency"

### CAL_STATIC_CAPABILITY_ONE_ALARM_ONLY

    #define CAL_STATIC_CAPABILITY_ONE_ALARM_ONLY              "one-alarm-only"

### CAL_STATIC_CAPABILITY_ORGANIZER_MUST_ATTEND

    #define CAL_STATIC_CAPABILITY_ORGANIZER_MUST_ATTEND       "organizer-must-attend"

### CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS

    #define CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS "organizer-not-email-address"

### CAL_STATIC_CAPABILITY_REMOVE_ALARMS

    #define CAL_STATIC_CAPABILITY_REMOVE_ALARMS               "remove-alarms"

### CAL_STATIC_CAPABILITY_CREATE_MESSAGES

    #define CAL_STATIC_CAPABILITY_CREATE_MESSAGES             "create-messages"

### CAL_STATIC_CAPABILITY_SAVE_SCHEDULES

    #define CAL_STATIC_CAPABILITY_SAVE_SCHEDULES              "save-schedules"

### CAL_STATIC_CAPABILITY_NO_CONV_TO_ASSIGN_TASK

    #define CAL_STATIC_CAPABILITY_NO_CONV_TO_ASSIGN_TASK	  "no-conv-to-assign-task"

### CAL_STATIC_CAPABILITY_NO_CONV_TO_RECUR

    #define CAL_STATIC_CAPABILITY_NO_CONV_TO_RECUR		  "no-conv-to-recur"

### CAL_STATIC_CAPABILITY_NO_GEN_OPTIONS

    #define CAL_STATIC_CAPABILITY_NO_GEN_OPTIONS		  "no-general-options"

### CAL_STATIC_CAPABILITY_REQ_SEND_OPTIONS

    #define CAL_STATIC_CAPABILITY_REQ_SEND_OPTIONS		  "require-send-options"

### CAL_STATIC_CAPABILITY_RECURRENCES_NO_MASTER

    #define CAL_STATIC_CAPABILITY_RECURRENCES_NO_MASTER       "recurrences-no-master-object"

### CAL_STATIC_CAPABILITY_ORGANIZER_MUST_ACCEPT

    #define CAL_STATIC_CAPABILITY_ORGANIZER_MUST_ACCEPT      "organizer-must-accept"

### CAL_STATIC_CAPABILITY_DELEGATE_SUPPORTED

    #define CAL_STATIC_CAPABILITY_DELEGATE_SUPPORTED	 "delegate-support"

### CAL_STATIC_CAPABILITY_NO_ORGANIZER

    #define CAL_STATIC_CAPABILITY_NO_ORGANIZER		 "no-organizer"

### CAL_STATIC_CAPABILITY_DELEGATE_TO_MANY

    #define CAL_STATIC_CAPABILITY_DELEGATE_TO_MANY		 "delegate-to-many"

### CAL_STATIC_CAPABILITY_HAS_UNACCEPTED_MEETING

    #define CAL_STATIC_CAPABILITY_HAS_UNACCEPTED_MEETING     "has-unaccepted-meeting"

### e_cal_util_construct_instance ()

    icalcomponent *     e_cal_util_construct_instance       (icalcomponent *icalcomp,
                                                             struct icaltimetype rid);

This checks that `rid` indicates a valid recurrence of `icalcomp`, and if so, generates a copy of `comp` containing a RECURRENCE-ID of `rid`.

`icalcomp` : | A recurring icalcomponent
`rid` : | The RECURRENCE-ID to construct a component for
Returns : | the instance, or `NULL`.

### e_cal_util_remove_instances ()

    void                e_cal_util_remove_instances         (icalcomponent *icalcomp,
                                                             struct icaltimetype rid,
                                                             CalObjModType mod);

Removes one or more instances from `comp` according to `rid` and `mod`.

FIXME: should probably have a return value indicating whether or not `icalcomp` still has any instances

`icalcomp` : | A (recurring) icalcomponent
`rid` : | The base RECURRENCE-ID to remove
`mod` : | How to interpret `rid`

### e_cal_util_get_system_timezone_location ()

    gchar *             e_cal_util_get_system_timezone_location
                                                            (void);

Returns : | system timezone location string, NULL on an error. Returned pointer should be freed with `g_free()`.

### e_cal_util_get_system_timezone ()

    icaltimezone *      e_cal_util_get_system_timezone      (void);

Returns : | icaltimezone object of the system timezone. NULL on an error. Returned pointer is part of the built-in timezones, thus do not free it.