## e-cal-util

e-cal-util — Various utility functions.

## Synopsis

                CalObjInstance;
    void        cal_obj_instance_list_free      (GList *list);
    enum        CalObjModType;
    enum        CalMode;
    void        cal_obj_uid_list_free           (GList *list);
    icalcomponent* e_cal_util_new_top_level     (void);
    icalcomponent* e_cal_util_parse_ics_file    (const char *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);
    int         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);
    icaltimezone* e_cal_util_resolve_tzid       (const char *tzid,
                                                 gpointer data);
    char*       e_cal_util_priority_to_string   (int priority);
    int         e_cal_util_priority_from_string (const char *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_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_SAVE_SCHEDULES
    icalcomponent* e_cal_util_construct_instance
                                                (icalcomponent *icalcomp,
                                                 struct icaltimetype rid);
    void        e_cal_util_remove_instances     (icalcomponent *icalcomp,
                                                 struct icaltimetype rid,
                                                 CalObjModType mod);

## Description

## Details

### CalObjInstance

    typedef struct {
    	char *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_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_parse_ics_file ()

    icalcomponent* e_cal_util_parse_ics_file    (const char *filename);

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

`filename` : | Name of the file to be parsed.
Returns : | an icalcomponent.

### 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` : |
`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 ()

    int         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` : |
`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_resolve_tzid ()

    icaltimezone* e_cal_util_resolve_tzid       (const char *tzid,
                                                 gpointer data);

`tzid` : |
`data` : |
Returns : |

### e_cal_util_priority_to_string ()

    char*       e_cal_util_priority_to_string   (int 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 ()

    int         e_cal_util_priority_from_string (const char *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_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_SAVE_SCHEDULES

    #define CAL_STATIC_CAPABILITY_SAVE_SCHEDULES              "save-schedules"

### 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`