From e3da733094145d63fbe8bfa69d1f7b3702c5225f Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Tue, 10 Sep 2024 17:59:46 +0100
Subject: propnet: Trigger propagators with no inputs.

* ravanan/propnet.scm (run-propnet): Pre-schedule all propagators.
* tests/propnet.scm: New file.
---
 ravanan/propnet.scm |  4 +++-
 tests/propnet.scm   | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 tests/propnet.scm

diff --git a/ravanan/propnet.scm b/ravanan/propnet.scm
index 4eef452..c820864 100644
--- a/ravanan/propnet.scm
+++ b/ravanan/propnet.scm
@@ -131,7 +131,9 @@ add to the inbox."
   
   (let loop ((cells (list))
              (cell-values-inbox initial-cell-values)
-             (propagators-inbox (list))
+             ;; Pre-schedule all propagators to ensure we trigger those
+             ;; propagators that have no inputs at all.
+             (propagators-inbox (propnet-propagators propnet))
              (propagators-in-flight (list)))
     (match cell-values-inbox
       ;; Process one new cell value in inbox.
diff --git a/tests/propnet.scm b/tests/propnet.scm
new file mode 100644
index 0000000..182eb30
--- /dev/null
+++ b/tests/propnet.scm
@@ -0,0 +1,41 @@
+;;; ravanan --- High-reproducibility CWL runner powered by Guix
+;;; Copyright © 2024 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of ravanan.
+;;;
+;;; ravanan is free software: you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation, either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; ravanan is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with ravanan.  If not, see <https://www.gnu.org/licenses/>.
+
+(use-modules (srfi srfi-64)
+             (ravanan propnet))
+
+(test-begin "propnet")
+
+(test-equal "Trigger propagator with no inputs"
+  '((out . #t))
+  (run-propnet (propnet (list (propagator "const"
+                                          (const '((out . #t)))
+                                          '()
+                                          '()
+                                          '((out . out))))
+                        (@@ (ravanan workflow) value=?)
+                        (@@ (ravanan workflow) merge-values)
+                        (scheduler (lambda (proc _)
+                                     proc)
+                                   (const 'completed)
+                                   0
+                                   (lambda (proc)
+                                     (proc))))
+               '()))
+
+(test-end "propnet")
-- 
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