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(define-module (output ical)
:use-module (ice-9 format)
:use-module (ice-9 match)
:use-module (util)
:use-module (vcomponent)
:use-module (vcomponent datetime)
:use-module (srfi srfi-1)
:use-module (datetime)
:use-module (datetime util)
:use-module (srfi srfi-41)
:use-module (srfi srfi-41 util)
:use-module (datetime zic)
:use-module (glob)
:use-module (vcomponent recurrence)
)
;; Format value depending on key type.
;; Should NOT emit the key.
(define (value-format key vline)
(define (handle-value value)
(catch #t #; 'wrong-type-arg
(lambda ()
(case key
((DTSTART DTEND RECURRENCE-ID DTSTAMP
LAST-MODIFIED EXDATE)
(with-output-to-string
(lambda ()
(case (and=> (prop vline 'VALUE) car)
[(DATE) (display (date->string (as-date value)
"~Y~m~d"))]
[else ; (DATE-TIME)
(display (datetime->string value "~Y~m~dT~H~M~S"))
(let ((tz (and=> (prop vline 'TZID) car)))
(when (and tz (string= tz "UTC"))
(display #\Z)))]))))
[(TZOFFSETFROM TZOFFSETTO)
(with-output-to-string
(lambda ()
(display (if (time-zero? (timespec-time value))
'+ (timespec-sign value)))
(display (time->string (timespec-time value) "~H~M"))
(when (not (zero? (second (timespec-time value))))
(display (time->string (timespec-time value) "~S")))))]
((DURATION X-HNH-DURATION)
#; (time->string value "~H~M~S")
(let ((s (second value)))
(format #f "~a~a~a"
(floor/ s 3600)
(floor/ (modulo s 3600) 60)
(modulo s 60))
))
[(RRULE)
;; NOTE
;; generated events are created with recur-rule objects.
;; parsed objects keep their string representation.
;; TODO normalize this.
(if ((@ (vcomponent recurrence internal) recur-rule?) value)
((@ (vcomponent recurrence internal) recur-rule->rrule-string) value)
value)]
(else
(escape-chars value)
)))
(lambda (err caller fmt args call-args)
(define fallback-string
(with-output-to-string (lambda () (display value))))
(format (current-error-port)
"WARNING: key = ~a, caller = ~s, call-args = ~s~%~k~%Falling back to ~s~%"
key caller call-args fmt args
fallback-string)
fallback-string
)))
(if (list? (value vline))
(format #f "~{~a~^,~}"
(map handle-value (value vline)))
(handle-value (value vline))))
(define (escape-chars str)
(with-output-to-string
(lambda ()
(string-for-each
(lambda (ch)
(case ch
((#\, #\; #\\) => (lambda (c) (display "\\") (display c)))
((#\newline) (display "\\n"))
(else (display ch))))
str))))
(define (generate-uuid)
((@ (rnrs io ports) call-with-port)
((@ (ice-9 popen) open-input-pipe) "uuidgen")
(@ (ice-9 rdelim) read-line)))
;; Fold long lines to limit width.
;; Since this works in characters, but ics works in bytes
;; this will overshoot when faced with multi-byte characters.
;; But since the line wrapping is mearly a recomendation it's
;; not a problem.
;; Setting the wrap-len to slightly lower than allowed also help
;; us not overshoot.
(define* (ical-line-fold string #:key (wrap-len 70))
(cond [(< wrap-len (string-length string))
(format #f "~a\r\n ~a"
(string-take string wrap-len)
(ical-line-fold (string-drop string wrap-len)))]
[else string]))
(define-public (component->ical-string component)
(format #t "BEGIN:~a\r\n" (type component))
(hash-for-each
;; Special cases depending on key.
;; Value formatting is handled in @code{value-format}.
(match-lambda*
;; Handled below
[('X-HNH-ALTERNATIVES _) 'noop]
;; Remove from output
[('X-HNH-FILENAME _) 'noop]
[(key vline)
(display
(ical-line-fold
;; Expected output: key;p1=v;p3=10:value
(format #f "~a~:{;~a=~@{~a~^,~}~}:~a"
key (properties vline)
(value-format key vline))))
(display "\r\n")])
(attributes component))
(for-each component->ical-string (children component))
(format #t "END:~a\r\n" (type component))
;; If we have alternatives, splice them in here.
(cond [(attr component 'X-HNH-ALTERNATIVES)
=> (lambda (alts) (hash-map->list (lambda (_ comp) (component->ical-string comp))
alts))]))
;; TODO place these somewhere better
(define *prodid* "-//hugo//Calparse 0.9//EN")
(define *zoneinfo* (apply read-zoneinfo
;; TODO move this to config, and figure out
;; how to best acquire/bundle zoneinfo.
(glob "~/down/tz/{africa,antartica,asia,australasia,europe,northamerica,southamerica,backward}")))
;; TODO tzid prop on dtstart vs tz field in datetime object
;; how do we keep these two in sync?
(define (write-event-to-file event calendar-path)
(define cal (make-vcomponent 'VCALENDAR))
(set! (attr cal 'PRODID) *prodid*
(attr cal 'VERSION) "2.0"
(attr cal 'CALSCALE) "GREGORIAN")
(add-child! cal event)
(awhen (prop (attr* event 'DTSTART) 'TZID)
(add-child! cal (zoneinfo->vtimezone *zoneinfo* it)))
(unless (attr event 'UID)
(set! (attr event 'UID)
(generate-uuid)))
(with-output-to-file (glob (format #f "~a/~a.ics"
calendar-path
(attr event 'UID)))
(lambda () (component->ical-string cal))))
(define (print-header)
(format #t
"BEGIN:VCALENDAR\r
PRODID:-//hugo//Calparse 0.5//EN\r
VERSION:2.0\r
CALSCALE:GREGORIAN\r
"
))
(define (print-footer)
(format #t "END:VCALENDAR\r\n"))
(define (get-tz-names events)
(lset-difference
equal? (lset-union
equal? '("dummy")
(filter-map
(lambda (vline) (and=> (prop vline 'TZID) car))
(filter-map (extract* 'DTSTART)
events)))
'("dummy" "local")))
(define-public (print-components-with-fake-parent events)
(print-header)
(let ((tz-names (get-tz-names events)))
(for-each component->ical-string
(map (lambda (name) (zoneinfo->vtimezone *zoneinfo* name))
tz-names)))
(for-each component->ical-string events)
(print-footer))
;; TODO add support for running without a range limiter, emiting all objects.
;; list x list x list x time x time →
(define-public (ical-main calendars regular-events repeating-events start end)
(print-components-with-fake-parent
(append (filter-sorted (lambda (ev) ((in-date-range? start end)
(as-date (attr ev 'DTSTART))))
regular-events)
;; TODO RECCURENCE-ID exceptions
;; We just dump all repeating objects, since it's much cheaper to do
;; it this way than to actually figure out which are applicable for
;; the given date range.
repeating-events)))
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