Skip headers from jupyter kernelspec list.

Author: ydl7

jupyter-kernelspec.el

@@ -61,7 +61,9 @@ each DIRECTORY will be a remote file name."
     (or (and (not refresh) (gethash host jupyter--kernelspecs))
         (let ((specs (plist-get
                       (jupyter-read-plist-from-string
-                       (or (jupyter-command "kernelspec" "list" "--json")
+                       (or (let* ((jupyter-output (jupyter-command "kernelspec" "list" "--json"))
+                                  (json-start (string-match-p (rx line-start "{") jupyter-output)))
+                             (and json-start (substring jupyter-output json-start)))
                            (error "Can't obtain kernelspecs from jupyter shell command")))
                       :kernelspecs)))
           (puthash host