Apply this patch to src/edwin/editor.scm so that you can open Edwin directly on files from a shell script, e.g., `$ edwin cool-file.txt'.

edwin-editor-load-file.patch

diff --git a/src/edwin/editor.scm b/src/edwin/editor.scm
index 5d23827..933e22d 100644
--- a/src/edwin/editor.scm
+++ b/src/edwin/editor.scm
@@ -28,13 +28,13 @@ USA.
 
 (declare (usual-integrations))
 
-(define (edit . args)
+(define (edit file . args)
   (call-with-current-continuation
    (lambda (continuation)
      (cond (within-editor?
 	    (error "edwin: Editor already running"))
 	   ((not edwin-editor)
-	    (apply create-editor args))
+	    (apply create-editor file args))
 	   ((not (null? args))
 	    (error "edwin: Arguments ignored when re-entering editor" args))
 	   (edwin-continuation
@@ -112,13 +112,16 @@ USA.
 (define create-editor-args
   '())
 
-(define (create-editor . args)
+(define (create-editor file . args)
   (let ((args
 	 (if (null? args)
 	     create-editor-args
 	     (begin
 	       (set! create-editor-args args)
-	       args))))
+	       args)))
+        (filename (if (file-exists? file)
+                      file
+                      #f)))
     (reset-editor)
     (event-distributor/invoke! editor-initializations)
     (set! edwin-editor
@@ -137,9 +140,11 @@ USA.
     (set! edwin-initialization
 	  (lambda ()
 	    (set! edwin-initialization #f)
-	    (standard-editor-initialization)))
+	    (if filename
+                (standard-editor-initialization filename)
+                (standard-editor-initialization))
     (set! edwin-continuation #f)
-    unspecific))
+    unspecific))))
 
 (define editor-initializations
   (make-event-distributor))
@@ -165,7 +170,7 @@ USA.
 
   (find-preferred preferences))
 
-(define (standard-editor-initialization)
+(define (standard-editor-initialization #!optional filename)
   (with-editor-interrupts-disabled
    (lambda ()
      (if (and (not init-file-loaded?)
@@ -176,7 +181,10 @@ USA.
 		 (load-edwin-file filename '(EDWIN) #t)))
 	   (set! init-file-loaded? #t)
 	   unspecific))))
-  (let ((buffer (find-buffer initial-buffer-name)))
+  (let ((buffer (find-buffer initial-buffer-name))
+        (filename (if (not (default-object? filename))
+                      ((ref-command find-file) filename)
+                      #f)))
     (if (and buffer
 	     (not inhibit-initial-inferior-repl?))
 	(start-inferior-repl!