From 7db773fdb71b15353e9c15c908867d308b887a7b Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Thu, 25 Jun 2026 17:19:39 +0100
Subject: lang: Raise &ccwl-violation when loading non-existent source files.

---
 ccwl/lang.scm  | 25 ++++++++++++++++++-------
 tests/lang.scm |  6 ++++++
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/ccwl/lang.scm b/ccwl/lang.scm
index c9ebae3..1189287 100644
--- a/ccwl/lang.scm
+++ b/ccwl/lang.scm
@@ -66,11 +66,22 @@ it."
                      (condition-irritants c)))))
     (read-syntax port)))
 
-(define (ccwl-load file)
+(define (ccwl-load-helper file file-syntax)
+  "Load ccwl source @var{file}. @var{file-syntax} is the syntax object
+wrapping @var{file}."
+  (if (file-exists? file)
+      (let ((source-path (canonicalize-path file)))
+        ;; Change directory before loading source file. The source
+        ;; file may reference other files with paths relative to its
+        ;; directory.
+        (call-with-current-directory (dirname source-path)
+          (lambda ()
+            (load source-path ccwl-read))))
+      (raise-continuable
+       (condition (ccwl-violation file-syntax)
+                  (formatted-message "File ~a does not exist"
+                                     file)))))
+
+(define-syntax-rule (ccwl-load file)
   "Load ccwl source @var{file}."
-  (let ((source-path (canonicalize-path file)))
-    ;; Change directory before loading source file. The source file
-    ;; may reference other files with paths relative to its directory.
-    (call-with-current-directory (dirname source-path)
-      (lambda ()
-        (load source-path ccwl-read)))))
+  (ccwl-load-helper file #'file))
diff --git a/tests/lang.scm b/tests/lang.scm
index 247f2e1..d8a891b 100644
--- a/tests/lang.scm
+++ b/tests/lang.scm
@@ -17,6 +17,8 @@
 ;;; along with ccwl.  If not, see <https://www.gnu.org/licenses/>.
 
 (use-modules (srfi srfi-64)
+             (test-utils utils)
+             (ccwl conditions)
              (ccwl lang))
 
 (test-begin "lang")
@@ -24,4 +26,8 @@
 (test-assert "load source file referencing external CWL workflow relative to it"
   (ccwl-load "test-data/external-cwl-workflow.scm"))
 
+(test-condition "loading non-existent source file must raise a &ccwl-violation"
+  ccwl-violation?
+  (ccwl-load "/non-existent/file.scm"))
+
 (test-end "lang")
-- 
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