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#!/usr/bin/guile \
-s
!#
(add-to-load-path (dirname (current-filename)))
(use-modules (srfi srfi-19)
(srfi srfi-26)
(vcalendar))
(define path
(if (null? (cdr (command-line)))
"testcal/d1-b.ics"
(cadr (command-line))))
(define cal (make-vcomponent path))
(define (extract field)
(cut get-attr <> field))
;;; Parse all start times into scheme date objects.
(for-each (cut transform-attr! <> "DTSTART"
(cut string->date <> "~Y~m~dT~H~M~S"))
(children cal 'VEVENT))
;;; This function borrowed from web-ics (calendar util)
(define* (sort* items comperator #:optional (get identity))
"A sort function more in line with how python's sorted works"
(sort items (lambda (a b)
(comperator (get a)
(get b)))))
;;; Sort the events, and print a simple agenda.
(let ((sorted-events
(sort* (children cal 'VEVENT)
time<? (compose date->time-utc (extract "DTSTART")))))
(for-each (lambda (ev) (format #t "~a | ~a~%"
(date->string (get-attr ev "DTSTART") "~1 ~H:~M")
(get-attr ev "SUMMARY")))
sorted-events))
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