Example of Guile-ICS (https://github.com/artyom-poptsov/guile-ics) usage: Convert iCalendar data to Emacs org-mode

fosdem-schedule-to-org-mode.scm

#!/usr/bin/guile \
-e main
!#

(use-modules (ice-9 popen)
             (srfi srfi-41)             ; streams
             ;; Guile-ICS
             (ics)
             (ics conv))

(setlocale LC_ALL "")

(define (main args)
  ;; We have to use 'curl' because 'http-get' from (web client) does
  ;; not work with HTTPS.
  (let ((p (open-input-pipe "curl 'https://fosdem.org/2017/schedule/ical'")))
    (stream-for-each ical-object->org-mode (ics->stream p))))

output.txt

$ cat rfc5545-example.ics | ./utils/ics --to-org-mode
* VCALENDAR
  :PROPERTIES:
  :PRODID: -//hacksw/handcal//NONSGML v1.0//EN
  :VERSION: 2.0
  :END:
** VEVENT
   :PROPERTIES:
   :SUMMARY: Bastille Day Party
   :DTEND: 19970715T040000Z
   :DTSTART: 19970714T170000Z
   :DTSTAMP: 19970610T172345Z
   :UID: 19970610T172345Z-AF23B2@example.com
   :END:
$ cat rfc5545-example.ics | ./utils/ics --pretty-print
BEGIN: VCALENDAR
  PRODID: -//hacksw/handcal//NONSGML v1.0//EN
  VERSION: 2.0
  BEGIN: VEVENT
    SUMMARY: Bastille Day Party
    DTEND: 19970715T040000Z
    DTSTART: 19970714T170000Z
    DTSTAMP: 19970610T172345Z
    UID: 19970610T172345Z-AF23B2@example.com
  END: VEVENT
END: VCALENDAR

rfc5545-example.txt

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
BEGIN:VEVENT
UID:19970610T172345Z-AF23B2@example.com
DTSTAMP:19970610T172345Z
DTSTART:19970714T170000Z
DTEND:19970715T040000Z
SUMMARY:Bastille Day Party
END:VEVENT
END:VCALENDAR