From 05e8b129f84a45e7539fafa971d0662445ef3890 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Tue, 21 Feb 2023 19:42:04 +0100
Subject: Add (vcomponent create).

---
 module/vcomponent/create.scm | 121 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 module/vcomponent/create.scm

(limited to 'module/vcomponent/create.scm')

diff --git a/module/vcomponent/create.scm b/module/vcomponent/create.scm
new file mode 100644
index 00000000..0521b39b
--- /dev/null
+++ b/module/vcomponent/create.scm
@@ -0,0 +1,121 @@
+(define-module (vcomponent create)
+  :use-module (vcomponent base)
+  :use-module ((srfi srfi-1) :select (last drop-right car+cdr))
+  :use-module (srfi srfi-9)
+  :use-module (srfi srfi-9 gnu)
+  :use-module (srfi srfi-17)
+  :use-module (srfi srfi-71)
+  :use-module (srfi srfi-88)
+  :use-module ((ice-9 hash-table) :select (alist->hashq-table))
+  :use-module ((hnh util) :select (kvlist->assq ->))
+  :export (with-parameters
+           as-list
+           vcomponent
+           vcalendar vevent
+           vtimezone standard daylight
+           ))
+
+;; TODO allow parameters and list values at same time
+
+
+
+;; Convert a scheme keyword to a symbol suitable for us
+(define (keyword->key keyword)
+  (-> keyword
+      keyword->string
+      string-upcase
+      string->symbol))
+
+(define (symbol-upcase symbol)
+  (-> symbol
+      symbol->string
+      string-upcase
+      string->symbol))
+
+;; Upcase the keys in an association list. Keys must be symbols.
+(define (upcase-keys alist)
+  (map (lambda (pair) (cons (symbol-upcase (car pair))
+                       (cdr pair)))
+       alist))
+
+
+
+(define-immutable-record-type <almost-vline>
+  (make-almost-vline parameters value)
+  almost-vline?
+  (parameters almost-vline-parameters)
+  (value almost-vline-value))
+
+(define (almost-vline->vline key almost-vline)
+  (make-vline key
+              (almost-vline-value almost-vline)
+              (almost-vline-parameters almost-vline)))
+
+(define (with-parameters . args*)
+  (define parameters (drop-right args* 1))
+  (define value (last args*))
+  (make-almost-vline
+   (-> parameters
+       kvlist->assq
+       upcase-keys
+       alist->hashq-table)
+   value))
+
+
+
+(define-immutable-record-type <list-value>
+  (make-list-value value)
+  list-value?
+  (value list-value-value))
+
+(define (as-list arg)
+  (make-list-value arg))
+
+
+
+(define (vcomponent type . attrs*)
+  (define component (make-vcomponent type))
+  (define attrs*-len (length attrs*))
+  (unless (zero? attrs*-len)
+    (let ((attrs children
+                 (if (and (list? (list-ref attrs* (- attrs*-len 1)))
+                          (or (= 1 attrs*-len)
+                              (not (keyword? (list-ref attrs* (- attrs*-len 2))))))
+                     (values (drop-right attrs* 1)
+                             (last attrs*))
+                     (values attrs* '()))))
+      (for-each (lambda (pair)
+                  (let ((key value (car+cdr pair)))
+                    (cond
+                     ((almost-vline? value)
+                      (set! (prop* component key)
+                        (almost-vline->vline key value)))
+                     ((list-value? value)
+                      (set! (prop* component key)
+                        (map (lambda (value)
+                               (make-vline key value (make-hash-table)))
+                             (list-value-value value))))
+                     (else
+                      (set! (prop component key) value)))))
+                (upcase-keys (kvlist->assq attrs)))
+
+      ;; Attach children
+      (for-each (lambda (child) (add-child! component child))
+                children)))
+
+  component)
+
+(define (vcalendar . attrs)
+  (apply vcomponent 'VCALENDAR attrs))
+
+(define (vevent . attrs)
+  (apply vcomponent 'VEVENT attrs))
+
+(define (vtimezone . attrs)
+  (apply vcomponent 'VTIMEZONE attrs))
+
+(define (standard . attrs)
+  (apply vcomponent 'STANDARD attrs))
+
+(define (daylight . attrs)
+  (apply vcomponent 'DAYLIGHT attrs))
-- 
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