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* Revert "Interrupt periodic save when launching process"Lars Henriksen2020-07-261-4/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This reverts commit 0f3d198 (Interrupt periodic save when launching process, 2017-09-08). Stopping and starting periodic save when external/hook programs are run causes deadlocks. The periodic save thread cannot be stopped/started at will, but should be started once and run uninterrupted as long as calcurse runs. Only if the configuration parameter is changed, must the thread be stopped and possibly restarted. The reasons are - the start routine unconditionally starts a thread. - the mechanism used to detect whether a thread is running or not, is designed to be used by the main calcurse thread only and with only one running thread of each kind (the thread ID of each running thread is kept in a variable; if the thread is not running, the variable has the main thread ID as value). Any load hook will be run at the initial dataload, and the stop/start calls will start a perodic save thread (this is true for the notify thread as well). Later when threads are started, a second periodic save thread is started (for the notify thread, a running thread is stopped before restart). When hooks are run by the periodic save thread, the stop call breaks down, leading to two running save threads (if not the case already) and subsequently to a deadlock when one thread tries to stop the other. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Run hooks quietlyLars Henriksen2020-07-261-15/+20
| | | | | | | | Hooks should not be run like external programs, but like load and save operations that do not take possession of the terminal. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Remove SIGCHLD signal handlerLars Henriksen2020-07-264-19/+17
| | | | | | | | | | | | | | The purpose is to make child_wait() reliable. The handler is meant for the notify main thread, but signal handlers are shared by all threads. In the calcurse main thread and the periodic save thread (hooks) the handler and child_wait() will compete (if the signal handler kicks in first, the waitpid() call in child_wait() will fail with errno ECHILD). All child processes in the main thread, the notify thread, the periodic save thread and the notify demon are explicitly waited for. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix configuration menu 'Quit' actionLars Henriksen2020-06-211-1/+4
| | | | | Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Improve help texts for recurrence rulesLars Henriksen2020-06-131-15/+15
| | | | | Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Remove systemdialogs option from configurationLars Henriksen2020-06-138-51/+9
| | | | | | | | | The option controls the welcome window and the export/import result messages. The former is dropped. The latter are now always displayed unless calcurse is invoked with the "quiet" option (-q). Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Allow repeat count input (for until) in interactive UILars Henriksen2020-06-133-18/+48
| | | | | | | | | | Shortened repetition type text. Avoid "duration" in until-contexts (reserve it for appointment duration): "duration" changed to "increment" in user texts as well as source. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Extend import of recurrence rulesLars Henriksen2020-06-133-25/+192
| | | | | | | | Support has been implemented for recurrence rule parts BYMONTH, BYMONTHDAY and BYDAY. A new test has been added. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Update import of basic recurrence rulesLars Henriksen2020-06-133-122/+208
| | | | | | | | | | | | | | | | | | | Conversion of COUNT to UNTIL was a simple calculation which assumed one repetiton per period (day, week, month or year); it does not take exception days and invalid dates into account. Solved by a new function which returns the n'th occurrence of a recurrence rule. In calcurse UNTIL is interpreted as a day (DATE), in RFC 5545 as a time of day (DATE-TIME). This has implications when a recurrence rule has an occurrence on the UNTIL day, see comment in ical.c An "Import:" note is added when a multi-day event is imported and turned into a calcurse all-day event. Icalendar quotes in comments have been updated to RFC 5545. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Support import of time zones (RFC 5545)Lars Henriksen2020-06-133-44/+99
| | | | | | | | | The property parameter time zone identifier (TZID) is recognized in DTSTART, DTEND and EXDATE and the DATE-TIME value converted to a local time. The time zone identifier is logged in the note file. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Let RETURN set frequency type to current value in repeat command UILars Henriksen2020-05-242-13/+19
| | | | | | | In addition, the prompt text is shortened. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Include start day in error message for recurrence ruleLars Henriksen2020-05-244-12/+36
| | | | | Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix "next occurrence" for multi-day appointmentsLars Henriksen2020-05-241-6/+9
| | | | | | | Better name: day for occur. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix recurrence rule expansion with ordered weekdayLars Henriksen2020-05-121-20/+43
| | | | | | | | | | | | | | When the order of a weekday in BYDAY rule expansion (like -5SA or 5SU for monthly or 55WE for yearly) exceeds the number of available weekdays in the period (month or year), rule expansion with negative order could result in a floating point exception. The reason: the modified frequency might become zero. Solution. Check order against number of available weekdays and terminate expansion early whenever possible (also for positive orders). Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Take value data type of event start into account in iCal import/exportLars Henriksen2020-05-031-73/+159
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch derives the item type (appointment or event) from the DTSTART value type. It is then used to perform an extended check of date/time values and reject non-conformant import files (like those reported in Github issues #81, (calcurse) events. The patch includes parsing and code corrections and minor refactoring. Background: Ical events are of two types, in calcurse called appointments and events. RFC 5545 has no distinguishing names for them, but describes them in section 3.6.1. The event type is derived from the value type of the DTSTART property. The value type may be either DATE-TIME (appointment) or DATE (event). If not specified by a VALUE property parameter in DTSTART, the default value type is DATE-TIME. The value type must be set explicitly to DATE to get an event. Other properties and rrule parts must agree with the DTSTART value type (DTEND, DURATION, EXDATE and UNTIL). Previously the type of an imported event was derived from the format of the DTSTART value. The DTSTART value type was not taken into account when importing, and not specified for recurring events when exporting (commit 0114289 solved it for events, see GitHub PR #97). Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Support interactive test of recurrence rule extensionsLars Henriksen2020-04-283-1/+68
| | | | | | | The generic command 'next' is introduced. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Help for recurrence rule extensionsLars Henriksen2020-04-281-29/+126
| | | | | | | | | | | The help command has been updated for "repeat". Context dependent, very terse information is built into the repeat command (edit command) for display in the status bar when editing the Weekdays, Months and Monthdays lists. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Treat recurrent events and appointments alikeLars Henriksen2020-04-281-1/+1
| | | | | | | | | | | | | | | | | | | | | The day vector (or "day_items" vector) is used to load the appointments panel with "day_items" (captions, appointments, events). A multi-day appointment has several "day_items" in the day vector. This may also be the case for a recurring item. The day_item structure has a member "start", which for day_items for recurring appointments is set to the occurrence found by recur_item_find_occurrence(), and is used to tell days of a multi-day appointment apart. For day_items for recurring events it was set to "day" of the recur_event structure (the same value for all occurrences) and not used. The value is now the occurrence found by recur_event_find_occurrence(). The patch is backwards compatible and future-proof. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix preselectionLars Henriksen2020-04-281-3/+4
| | | | | | | | | The preselected item is not searched for if the range of days is changed (day_changed = 1). The patch is meant to future-proof the selected-item-algorithm and is backwards compatible. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Refactor the repeat commandLars Henriksen2020-04-282-166/+87
| | | | | | | | | | Code duplication has been eliminated by calling update_rept() from the repeat command ui_day_item_repeat(). The repeat command asks for simple or advanced repetition. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* User interface for recurrence rulesLars Henriksen2020-04-283-77/+416
| | | | | | | | | | | | | | | | | | | | | | | | The function update_rept() is extended with editing of the three recurrence rule lists for BYMONTH, BYMONTHDAY and BYDAY. The integers of the bymonth and bymonthday lists are edited directly as integers, while those of the bywday list are mapped to localized weekday names (as they appear in the calendar panel) with an optional integer prefix (in RFC5545 style: 1MO, -2SA). The RFC5545 (icalendar) requirement that the start day must be the first occurrence and must match the recurrence rule, is met by testing that an occurrence indeed appears on the start day, in these circumstances: - when a recurrent item is loaded from file - when the recurrence rule of an item is edited interactively - when a recurrent appointment gets a new start time - when a recurrent appointment is moved Copy and paste of a recurrent item will only retain the basic recurrence properties of type, frequency, until and exception days. Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Recurrence rule extensionsLars Henriksen2020-04-286-25/+847
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Terms and concepts are from RFC 5545 (the iCalendar specification). Overall design -------------- Calcurse is extended with full support for BYMONTH, BYDAY and BYMONTHDAY recurrence rule (rrule) parts. The three rule parts are lists of, respectively, months, weekdays and monthdays. The lists are added to 'struct rpt' as linked lists of integers, and the data file format is extended accordingly (details below). Load and save of the lists follow the pattern of the existing list of exception dates, also in 'struct rpt'. The function recur_item_find_occurence() is split into a front-end and a back-end. The back-end, called find_occurrence(), is the original function extended with rrule reductions; the front-end retains the original name and performs rrule expansions. Front-end plus back-end are backwards compatible and require no changes in calling functions. There is no user interface in this patch. Data file extensions -------------------- The BYMONTH, BYDAY and BYMONTHDAY lists are added to that part of an item line which describes the recurrence rule (the "{...}" part). Each list is - like the list of exception days - a space-separated string of values identified by the initial character. Each list is optional and, if present, must follow the until date and precede the exception day list. The lists must appear in order BYMONTHDAY list, BYDAY list and BYMONTH list. The possible list values are - BYMONTH: m1, m2, ..., m12 - BYDAY: w0, w1, ..., w6, w7, w-7, w8, w-8, ..., w377, w-377 - BYMONTHDAY: d1, d2, ..., d31, d-1, d-2, ..., d-31 which are interpreted as (cf. RFC 5545) - BYMONTH: January, February, ..., December. - BYDAY: SU, MO, ..., SA, +1SU, -1SU, +1MO, -1MO, ..., +53SA, -53SA - BYMONTHDAY: the first, the second, ..., the 31st, the last, the last but one, ..., the last but 30 day of the month Examples: Thursday, TH, is w4; Saturday, SA, is w6. The seventh Thursday, +7TH, is w53 (7 * 7 + 4 = 53); the last but second Saturday, -2SA, is w-20 (2 * 7 + 6 = 20); the last day of the month is d-1. Note that the values w-1, w-2, ..., w-6 are not used. A recurrent appointment with a BYDAY rule part: 06/23/2019 @ 12:00 -> 06/23/2019 @ 13:00 {1W w0 w6} |every week on Sunday and Saturday An event with a BYDAY and a BYMONTH rule part: 10/27/2019 [1] {1Y w-7 m10} every year on last Sunday in October An event with until date, a BYMONTH rule part and an exception day: 06/23/2019 [1] {1Y -> 08/31/2021 m5 m6 m7 !07/23/2020} every year on the 23rd in May, June and July for three years, starting on Sunday, 23 June 2019, but not on 23 July 2020. Recurrence set expansion and reduction --------------------------------------- In calcurse a recurrence rule is a quadruple (s, d, r, e) consisting of start, duration, repetition pattern and exception days and is implemented as: (time_t start, long dur, struct rpt *rpt, llist_t *exc) In RFC 5545 parlance, a recurrence rule defines a recurrence set consisting of all recurrence instances (occurrences) not earlier than start which match the rule pattern. With this concept in mind, recur_item_find_occurremce() may be thought of as a membership function for a recurrence set. The call recur_item_find_occurrence(s, d, r, e, day, occurrence) returns true if day belongs to the recurrence set of (s, d, r, e); if so occurrence points to the recurrence instance (the set member). For a recurrence rule with only the basic DAYLY, WEEKLY, MONTHLY or YEARLY type and frequency the recurrence set consists of periodically repeated instances. The BYxxx rule parts modify the recurrence set by reducing or expanding it as specified by RFC 5545. Expansion is implemented in the front-end by modifications of start and/or frequency of the rule (s, d, r, e), often several times, in such a way that the desired recurrence instances are included in the recurrence set. This is possible because the front-end as the very first thing checks for early days (day < s). When day is known not to be early, start (s) can safely be moved backwards. Likewise, if frequency must be changed, the front-end checks whether the frequency repetition applies to the week, month or year of day. Reduction is easier and is performed in the back-end along with the existing validity checks. It consists in checking whether month, day of month or weekday of a found occurrence is on the appropriate list. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Refactor edit of exception daysLars Henriksen2020-04-283-24/+34
| | | | | | | | | | | | | | | The patch contains no functional changes, but is a necessary precondition for extensions of update_rept() (in ui-day.c) with further recurrence rules. The reason is that recurrence parameters must be treated as a whole: if an edit session is cancelled at any point, no value should change, and all parameters should remain as they were. Hence, the new values must only be set after all of them have been determined. This was not the case for the list of exception days, but as long as it was treated last, it did not matter. Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Improve data load error reportingLars Henriksen2020-04-285-53/+54
| | | | | | | | | | | The last part of loading appointments and events is performed by four "scan" functions called from io_load_app(). Failure in this part of data load does not use io_load_error(). The four "scan" functions are changed to return an error message on failure and NULL otherwise (the previous return value was not used). Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Refactor function calls: recurrence parameters as a single argumentLars Henriksen2020-04-285-189/+151
| | | | | | | | | | | | | | | | | | | | | The recurrence parameters are type, frequency, until date and exception list (in RFC 5545 parlance FREQ, INTERVAL, UNTIL and EXDATE's). When these are passed in a function call, the argument list becomes long and not very readable. When support for extended recurrence rules is implemented, the number of recurrence parameters increases, and function signatures must be amended. Solution: The "struct rpt" is extended with the exception list; any future recurrence parameters are added here. A pointer to this structure replaces the recurrence parameters in function calls. Note: Each recurrent event and appoinment instance has (a pointer to) a "struct rpt" and in addition an exception list. The latter is retained to avoid the derived changes, and the exception list in the structure is initialized to an empty list when the recurrent instance is created. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Use "struct rpt" to shorten argument listsLars Henriksen2020-04-284-95/+78
| | | | | | | Also, prepare for extension of the structure, shorten names and rearrange comments. Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Extend use of note file for iCal importLars Henriksen2020-04-282-67/+281
| | | | | | | | | | iCal import to an item note file is extended from DESCRIPTION to LOCATION, COMMENT and STATUS for both events and todos. Addresses GitHub issue #9. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Accept empty DESCRIPTION in ical importLars Henriksen2020-04-281-5/+0
| | | | | | | Adresses GitHub issue #274. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix formatting of DTSTART for recurrent eventsJerem-K2020-04-281-1/+1
| | | | Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix missing EOL in imported noteLars Henriksen2020-03-271-1/+6
| | | | | Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix decoding of escaped characters in imported textLars Henriksen2020-03-221-11/+20
| | | | | | | | Stick strictly to RFC 5545, 3.3.11, Text, for SUMMARY and DESCRIPTION. Adresses Github issue #271. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix ical import loggingLars Henriksen2020-03-221-29/+59
| | | | | | | | | | | | | | | | | | | | | | | | The following issues have been fixed: Functions ical_read_event() and ical_read__todo() do not check the return value of functions which may fail, in which case an item is not skipped even though a problem may have been logged by the called function. Function ical_read_note() fails on empty DESCRIPTION, but does not log it. Function ical_read_exdate() may log a failure, but cannot fail itself. Function ical_read_summary() can fail, but not log a failure. Function ical_read_todo() do not skip a todo with an invalid priority. Additionally: A safety check has been added to ical_get_value(), and log messages resulting from failures have been made uniform. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix display of interactively imported todosLars Henriksen2020-03-221-0/+1
| | | | | | | Todos were imported (and saved), but not loaded into the listbox for display. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Improve ical import loggingLars Henriksen2020-03-224-32/+41
| | | | | | | | | The log file is not deleted if items were skipped (adresses Github issue #269). The log file includes the import file name and time. The import line numbers have been corrected (and tests amended). Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Escape necessary characters in SUMMARY on exportKelvin Jackson2020-03-221-5/+26
| | | | | | | Escape semicolons, commas, and backslashes when exporting a calendar item to iCal format. Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Update copyright rangesLukas Fleischer2020-01-3040-41/+41
| | | | Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Refactor cut and paste registersLars Henriksen2020-01-134-16/+25
| | | | | | | | | | Register REG_BLACK_HOLE can neither be copied into nor pasted from and has been removed from the input routine. Register 36 was not used. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Optimize error handling in io_check_dir()Nitroretro2019-12-291-12/+13
| | | | Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Change documentation to reflect the new file structureNitroretro2019-12-231-3/+8
| | | | Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Add XDG Base Directory SupportNitroretro2019-12-232-9/+37
| | | | | | | | | | | * Use "$XDG_DATA_HOME/calcurse" for data files * Use "$XDG_CONFIG_HOME/calcurse" for config files * "$XDG_DATA_HOME" defaults to "$HOME/.local/share" * "$XDG_CONFIG_HOME" defaults to "$HOME/.config" * If "$HOME/.calcurse" exists, then it will be used instead for backward compatibility. Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Make io_check_dir() create parent directoriesNitroretro2019-12-231-5/+27
| | | | Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix next recurrent appointment deletedLars Henriksen2019-12-231-1/+10
| | | | | | | | | | | If the notify bar displays a recurrent appointment after midnight as next upcoming appointment, the bar is not updated when the appointment/occurrence is deleted. The problem is not seen in 4.3.0 because of the bug described in commit 8cbd456, Fix next recurring appointment. The problem and the solution is the same, this time in the function notify_same_recur_item(). Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix empty string in updatestring()Lars Henriksen2019-12-231-3/+9
| | | | | | | | If the update results in an empty string (return value GETSTRING_RET), the original string remains whereas it should be empty. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Make the text for empty days configurableLars Henriksen2019-11-035-1/+27
| | | | | | | The default is "--"; a single space makes the text invisible. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Allow discarding a todo item from the priority promptLukas Fleischer2019-11-031-2/+4
| | | | Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Support RET to set the todo item priority to 0Issam Maghni2019-11-031-4/+7
| | | | Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Fix save of interactively imported dataLars Henriksen2019-11-031-0/+4
| | | | | | Adresses Github issue #249. Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* DST and recurrent itemsLars Henriksen2019-10-181-35/+36
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The patch adresses two issues with the function recur_item_find ocurrence(), one major: mktime(), and one minor: item duration. In addition, some refactoring is done. The following recurrent appointments demonstrate the problems (as described in the message) and are used as test cases in the associated test commit. 03/29/2019 @ 12:00 -> 03/30/2019 @ 11:00 {2D -> 04/03/2019} |two-day - every other day - not on 1/4 03/31/2019 @ 12:00 -> 03/31/2019 @ 13:00 {1D -> 04/01/2019} |daily - not on 31/3, twice on 1/4 03/31/2019 @ 04:00 -> 03/31/2019 @ 05:00 {1W} |weekly - appears after one week 03/31/2019 @ 12:00 -> 03/31/2019 @ 12:00 {1M} |monthly - never appears 03/31/2019 @ 12:00 -> 03/31/2019 @ 12:00 {1Y} |yearly - never appears 10/20/2019 @ 00:00 -> 10/21/2019 @ 01:00 {1W -> 11/03/2019} |25 hours - ends on 27th, but continues on 28th 03/24/2019 @ 00:00 -> 03/25/2019 @ 00:00 {1W -> 04/07/2019} |24 hours - does not continue on April 1 The root cause is two mktime() calls in recur_item_find_occurrence(), both of which use an inherited tm_isdst value in the tm structure. In such cases mktime() will "normalize" the tm stucture if tm_isdst is 0 or 1 and in disagreement with the rest of the tm contents (just like 32 May will be normalized to 1 June). Example. In 2019 DST started on 31/3 at 02:00:00 (in the European Union). If the (local) time "31/3/2018 00:00:00" is passed to mktime() with tm_isdst = 0, the return value is (say) T sec and the tm structure is unchanged, because DST is not in effect at midnight. If the same call is performed with tm_isdst = 1, the return value becomes (T - 3600) sec and the tm structure is normalized to "30/3/2018 23:00:00", tm_isdst = 0. In recur_item_find_occurrence(), the normalized tm structure with wrong day and time is used in ensuing calculations, leading to wrong dates and the errors observed. The first mktime() call is used to calculate the "day span" of the occurrence before the occurrence itself has been determined. But once the occurence is known, the "day span" is easily determined, and there is no need for the first mktime() call. Events have no explicit duration. However, recur_event_find_occurrence() and recur_event_inday() set the duration of an event to DAYINSEC before passing it on to recur_item_find_occurrence(). The value is not correct on the day when DST begins or ends. The interpretation of the daylength should be left to the called function. Hence, duration is set to -1 to signal no (explicit) duration. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* Set time-of-day consistently to midnight for until dayLars Henriksen2019-09-062-8/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A day begins on midnight (inclusive) and ends on midnight (exclusive). A day as a whole is represented by the initial midnight, i.e. time-of-day is 00:00. On load of recurrent appointments (but not events) time-of-day for the until day is set to 23:59. For a newly created recurrent appointment the setting depends on the input method: time-of-day is set to 00:00 if until day is given as a date (day, month and year), but to time-of-day for the start day if given as an offset (+dd). The resulting behaviour is only visible in interactive use of calcurse as proved by the following scenario. 1) Create an appointment with start time 12:00, end time 11:59 (multi day). 2) Turn it into a recurrent appointment of type daily, frequency 3, until day +3. The appointment is correctly displayed with two 2-day occurrences three days apart. 3) Edit the appointment and select Repetition. Accept existing type, frequency and end day (now as a date). The second day of the second occurrence disappears. 4) Repeat 3), but set the end day as an offset (+3). The second day of the second occurrence reappears. The inconsistencies have been eliminated, and time-of-day for the until day is now always 00:00. Also, until day may equal start day, so midnights should be compared. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
* DST: fix date_change() thoroughlyLars Henriksen2019-09-061-1/+2
| | | | | | | | Explicit setting of Daylight Saving Time should be avoided before as well as after the mktime() call. Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk> Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
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