From 9c908b0c745f56b887f40ff4a37f07185561b95f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@hornquist.se>
Date: Mon, 4 Nov 2019 16:51:30 +0100
Subject: Remove (vcomponent timezone).

---
 module/vcomponent.scm                     |  1 -
 module/vcomponent/recurrence/generate.scm |  1 -
 module/vcomponent/timezone.scm            | 96 -------------------------------
 3 files changed, 98 deletions(-)
 delete mode 100644 module/vcomponent/timezone.scm

(limited to 'module')

diff --git a/module/vcomponent.scm b/module/vcomponent.scm
index 18a96e7a..1bffe847 100644
--- a/module/vcomponent.scm
+++ b/module/vcomponent.scm
@@ -1,7 +1,6 @@
 (define-module (vcomponent)
   #:use-module (vcomponent datetime)
   #:use-module (vcomponent recurrence)
-  #:use-module (vcomponent timezone)
   #:use-module (vcomponent base)
   #:use-module (vcomponent parse)
   #:use-module (srfi srfi-1)
diff --git a/module/vcomponent/recurrence/generate.scm b/module/vcomponent/recurrence/generate.scm
index ea17b0e0..50ce83e5 100644
--- a/module/vcomponent/recurrence/generate.scm
+++ b/module/vcomponent/recurrence/generate.scm
@@ -8,7 +8,6 @@
 
   #:use-module (util)
   #:use-module (vcomponent base)
-  #:use-module (vcomponent timezone)
   #:use-module (vcomponent recurrence internal)
   #:use-module (vcomponent recurrence parse)
 
diff --git a/module/vcomponent/timezone.scm b/module/vcomponent/timezone.scm
deleted file mode 100644
index ed3bef6b..00000000
--- a/module/vcomponent/timezone.scm
+++ /dev/null
@@ -1,96 +0,0 @@
-(define-module (vcomponent timezone)
-  :use-module (vcomponent base)
-  :use-module ((srfi srfi-1) :select (find))
-  :use-module (srfi srfi-19)
-  :use-module (srfi srfi-19 util)
-  :use-module (srfi srfi-41)
-  :use-module (srfi srfi-41 util)
-  :use-module (util)
-  :use-module ((vcomponent recurrence generate) :select (generate-recurrence-set))
-  :use-module ((vcomponent datetime) :select (ev-time<?))
-  )
-
-;;@begin exampe
-;; <VTIMEZONE> :: "#<vcomponent 558c5da80fc0>"
-;;                  TZID: Europe/Stockholm
-;;        X-LIC-LOCATION: Europe/Stockholm
-;; : <DAYLIGHT> :: "#<vcomponent 558c5e11e7c0>"
-;; :                RRULE: FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
-;; :              DTSTART: 19700329T020000
-;; :               TZNAME: CEST
-;; :           TZOFFSETTO: +0200
-;; :         TZOFFSETFROM: +0100
-;; : <STANDARD> :: "#<vcomponent 558c5e11e7e0>"
-;; :                RRULE: FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
-;; :              DTSTART: 19701025T030000
-;; :               TZNAME: CET
-;; :           TZOFFSETTO: +0100
-;; :         TZOFFSETFROM: +0200
-;; @end example
-
-;; Given a tz stream of length 2, extrapolates when the next timezone
-;; change aught to be.
-;; Currently it does so by taking the first time zone, and adding one
-;; year. This kind of works.
-;; Previously it took the difference between element 2 and 1, and added
-;; that to the start of the secound time zone. This was even more wrong.
-;; TODO? set remaining properties, and type of the newly created component.
-(define (extrapolate-tz-stream strm)
-  (let ((nevent (copy-vcomponent (stream-car strm))))
-    (set! (attr nevent 'DTSTART)
-      (date->time-utc
-       (set (date-year
-             (time-utc->date (attr nevent 'DTSTART)))
-            = (+ 1))))
-    (stream-append strm (stream nevent))))
-
-;; The RFC requires that at least one DAYLIGHT or STANDARD component is present.
-;; Any number of both can be present. This should handle all these cases well,
-;; as long as noone has multiple overlapping timezones, which depend on some
-;; further condition. That feels like something that should be impossible, but
-;; this is (human) time we are talking about.
-(define-public (make-tz-set tz)
-  (let ((strm (interleave-streams
-               ev-time<?
-               ;; { DAYLIGHT, STANDARD }
-               (map generate-recurrence-set (children tz)))))
-
-    (cond [(stream-null? strm) stream-null]
-
-          [(stream-null? (stream-drop 2 strm))
-           (let ((strm (extrapolate-tz-stream strm)))
-             (stream-zip strm (stream-cdr strm)))]
-
-          [else (stream-zip strm (stream-cdr strm))])))
-
-;; str ::= ±[0-9]{4}
-;; str → int seconds
-(define (parse-offset str)
-  (let* (((± h1 h0 m1 m0) (string->list str)))
-    ((primitive-eval (symbol ±))
-     (+ (* 60    (string->number (string m1 m0)))
-        (* 60 60 (string->number (string h1 h0)))))))
-
-;; Finds the VTIMEZONE with id @var{tzid} in calendar.
-;; Crashes on error.
-(define (find-tz cal tzid)
-  (let ((ret (find (lambda (tz) (string=? tzid (attr tz 'TZID)))
-                   (filter (lambda (o) (eq? 'VTIMEZONE (type o)))
-                           (children cal)))))
-    ret))
-
-;; Takes a VEVENT.
-;; Assumes that DTSTART has a TZID property, and that that TZID is available as
-;; a direct child of the parent of @var{ev}.
-(define-public (get-tz-offset ev)
-  (let ((ret (stream-find
-              (lambda (z)
-                (let* (((start end) (map (extract 'DTSTART) z)))
-                  (and (time<=? start (attr ev 'DTSTART))
-                       (time<? (attr ev 'DTSTART) end))))
-              (attr (find-tz (parent ev)
-                             (car (prop (attr* ev 'DTSTART) 'TZID)))
-                    'X-HNH-TZSET))))
-    (if (not ret)
-        0 (parse-offset (attr (car ret) 'TZOFFSETTO)))))
-
-- 
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