From 02aba668c408a473067bc26b8f36077384b9c14a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Tue, 8 Mar 2022 03:43:03 +0100
Subject: Add native UUID generator.

While not necessary, since we barely use UUID:s, it's still WAY faster,
and nice to not depend on the system providing `uuidgen'.

For comparison, number of UUID:s generated by different settups in 1
second:

   65.000 :: guile native
      700 :: guile shell-out
3.500.000 :: c native
  100.000 :: libuuid - guile bindings
  650.000 :: libuuid

Tests where run with either
    (call-with-time-limit
      1
      (lambda ()
	(let loop ()
	 (uuid)
	 (set! count (1+ count))
	 (loop)))
      (lambda _ (display count)))
or
    volatile unsigned long long count = 0;
    sigaction(SIGALARM, ...);
    alarm(1);
    for (;;) {
	uuid();
	count++;
    }

(let ((count 0))
  (call-with-time-limit
   1
   (lambda ()
     (let loop ()
       ((@ (hnh util) uuidgen))
       (set! count (1+ count))
       (loop)))
   (lambda _ (format #t "exec count = ~:d~%" count))))
---
 module/vcomponent/formats/vdir/save-delete.scm | 3 ++-
 module/vcomponent/util/instance/methods.scm    | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

(limited to 'module/vcomponent')

diff --git a/module/vcomponent/formats/vdir/save-delete.scm b/module/vcomponent/formats/vdir/save-delete.scm
index 6068e34c..7de9379b 100644
--- a/module/vcomponent/formats/vdir/save-delete.scm
+++ b/module/vcomponent/formats/vdir/save-delete.scm
@@ -11,6 +11,7 @@
 
 (define-module (vcomponent formats vdir save-delete)
   :use-module (hnh util)
+  :use-module (hnh util uuid)
   :use-module ((hnh util path) :select (path-append))
   :use-module ((hnh util exceptions) :select (assert))
   :use-module (vcomponent formats ical output)
@@ -24,7 +25,7 @@
 
   (assert (eq? 'vdir (prop calendar '-X-HNH-SOURCETYPE)))
 
-  (let* ((uid (or (prop event 'UID) (uuidgen))))
+  (let* ((uid (or (prop event 'UID) (uuid))))
     (set! (prop event 'UID) uid
       ;; TODO use existing filename if present?
       (prop event '-X-HNH-FILENAME) (path-append
diff --git a/module/vcomponent/util/instance/methods.scm b/module/vcomponent/util/instance/methods.scm
index 120ab2fe..926f9bb8 100644
--- a/module/vcomponent/util/instance/methods.scm
+++ b/module/vcomponent/util/instance/methods.scm
@@ -1,5 +1,6 @@
 (define-module (vcomponent util instance methods)
   :use-module (hnh util)
+  :use-module (hnh util uuid)
   :use-module (srfi srfi-1)
   :use-module (srfi srfi-41)
   :use-module (srfi srfi-41 util)
@@ -93,7 +94,7 @@
 
   (add-child! calendar event)
   (unless (prop event 'UID)
-    (set! (prop event 'UID) (uuidgen)))
+    (set! (prop event 'UID) (uuid)))
 
 
 
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