next : um next calls (um--header) and only prints the filename for piping : no more auto open

um.el

@@ -358,7 +358,7 @@ Prefix arg prompts for the directory instead.
 + tags
 
 "
-  (insert
+  (with-temp-buffer (insert
                      (format "# %s\n: %s%s" filename (format-time-string um--date-format) um--header-end))
                     (when tags
                       (forward-line -1)
@@ -366,19 +366,8 @@ Prefix arg prompts for the directory instead.
                         (insert (format "+ %s\n"
                                         (if (equal "+" tag)
                                             (cadr (split-string filename "\\."))
-                        tag))))
+                                          tag)))))
-    (forward-line)))
+                    (buffer-string)))
-
-;;;###autoload
-(defun um-next (filename &optional tags)
-  "Takes the filename generated by the CLI, opens it, and adds the header.
-
-Optional TAGS string may contain more than one tag separated by a comma.
-
-A tag with a value of \"+\" is rendered as the descriptor portion of the filename.
-"
-  (find-file filename)
-  (um--header filename tags))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;; um-minor-mode