From 4572d6dc612f73a3f44c1a8d4dc49c83dced07af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Mon, 11 Nov 2019 12:07:11 +0100
Subject: Work on ICS output.

---
 module/output/ical.scm | 84 ++++++++++++++++++++++++++++++++++----------------
 1 file changed, 58 insertions(+), 26 deletions(-)

(limited to 'module/output/ical.scm')

diff --git a/module/output/ical.scm b/module/output/ical.scm
index 11633e52..a0df6445 100644
--- a/module/output/ical.scm
+++ b/module/output/ical.scm
@@ -3,6 +3,7 @@
   :use-module (ice-9 format)
   :use-module (util)
   :use-module (vcomponent)
+  :use-module (srfi srfi-1)
   :use-module (srfi srfi-19)
   :use-module (srfi srfi-19 util)
   :use-module (srfi srfi-41)
@@ -13,20 +14,30 @@
   '((from (value #t) (single-char #\f))
     (to (value #t) (single-char #\t))))
 
-(define (value-format key value)
-  ;; TODO remove once key's are normalized to symbols.
-  (case key
-    ((DTSTART DTEND)
-     (time->string value "~Y~m~dT~H~M~SZ"))
-    ((DURATION)
+(define (value-format key vline)
+  (catch 'wrong-type-arg
+    (lambda ()
+     (case key
+       ((DTSTART DTEND)
+        (time->string (value vline) (if (prop vline 'TZID)
+                                        "~Y~m~dT~H~M~S"
+                                        "~Y~m~dT~H~M~SZ" )))
+       ((DURATION X-HNH-DURATION)
      #; (time->string value "~H~M~S")
-     (let ((s (time-second value)))
-       (format #f "~a~a~a"
-               (floor/ s 3600)
-               (floor/ (modulo s 3600) 60)
-               (modulo s 60))
-       ))
-    (else value)))
+        (let ((s (time-second (value vline))))
+          (format #f "~a~a~a"
+                  (floor/ s 3600)
+                  (floor/ (modulo s 3600) 60)
+                  (modulo s 60))
+          ))
+       ((RRULE) (value vline))
+
+       (else (escape-chars (value vline)))))
+    (lambda (err caller fmt args call-args)
+      (format (current-error-port)
+              "WARNING: ~k~%" fmt args)
+      (with-output-to-string (lambda () (display (value vline))))
+      )))
 
 (define (escape-chars str)
   (with-output-to-string
@@ -38,36 +49,48 @@
                            (else (display ch)))
                          ) str))))
 
+(define wrap-len 70 #; (floor/ 75 2)
+  )
+
+(define (ical-line-fold string)
+  (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 (component->ical-string component)
-  (format #t "BEGIN:~a~%" (type component))
+  (format #t "BEGIN:~a\r\n" (type component))
   (hash-for-each (lambda (key vline)
                    ;; key;p1=v;p3=10:value
-                   (format #t "~a~:{;~a=~@{~a~^,~}~}:~a~%"
-                           key (properties vline)
-                           ;; TODO wrap lines
-                           (escape-chars (value-format key (value vline)))))
+
+                   (display
+                    (ical-line-fold
+                     (format #f "~a~:{;~a=~@{~a~^,~}~}:~a"
+                             key (properties vline)
+                             ;; TODO wrap lines
+                             (value-format key vline))))
+                   (display "\r\n"))
             (attributes component))
   (for-each component->ical-string (children component))
-  (format #t "END:~a~%" (type component))
+  (format #t "END:~a\r\n" (type component))
 
   )
 
 (define (print-header)
   (format #t
-"BEGIN:VCALENDAR
-PRODID:-//hugo//Calparse 0.5//EN
-VERSION:2.0
-CALSCALE:GREGORIAN
+"BEGIN:VCALENDAR\r
+PRODID:-//hugo//Calparse 0.5//EN\r
+VERSION:2.0\r
+CALSCALE:GREGORIAN\r
 "
 ))
 
 
 (define (print-footer)
-  (format #t "END:VCALENDAR~%"))
+  (format #t "END:VCALENDAR\r\n"))
 
 (define-public (ical-main calendars events args)
-
-
   (define opts (getopt-long args opt-spec))
 
   (define start (cond [(option-ref opts 'from #f) => parse-freeform-date]
@@ -77,6 +100,15 @@ CALSCALE:GREGORIAN
 
   (print-header)
 
+  (let ((tzs (make-hash-table)))
+    (for cal in calendars
+         (for tz in (filter (lambda (e) (eq? 'VTIMEZONE (type e))) (children cal))
+              (hash-set! tzs (attr tz 'TZID) tz)))
+
+    (hash-for-each (lambda (key component) (component->ical-string component))
+                   tzs))
+
+  ;; TODO this contains repeated events multiple times
   (stream-for-each
    component->ical-string
    (filter-sorted-stream (lambda (ev) ((in-date-range? start end)
-- 
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