ein-completer: Robuster oinfo

By covering our ears and ignoring as much as possible. Apparently SyntaxError is
not a subtype of Exception. Also need to send raw strings otherwise unicode
characters will cause fits.

Also added new command, `ein:pytools-reinject` to reinject ein's pytools code.
The name could probably use some work.

lisp/ein-completer.el

@@ -139,7 +139,7 @@ notebook buffers and connected buffers."
     (if (ein:kernel-live-p kernel)
         (ein:kernel-execute
          kernel
-         (format "__ein_print_object_info_for(__ein_maybe_undefined_object(\"%s\", locals()))" obj)
+         (format "__ein_print_object_info_for(__ein_maybe_undefined_object(r\"%s\", locals()))" obj)
          (list
           :output `(,(lambda (d &rest args) (deferred:callback-post d args)) . ,d)))
       (deferred:callback-post d (list nil nil)))

lisp/ein-pytools.el

@@ -67,6 +67,15 @@ If OTHER-WINDOW is non-`nil', open the file in the other window."
        kernel
        (buffer-string)))))
 
+(defun ein:pytools-reinject ()
+  "Re-send ein's pytools code to the current kernel.
+
+If the kernel is reset by the notebook server then it may become
+necessary to call this command to ensure pytools continue
+working."
+  (interactive)
+  (ein:pytools-load-safely (ein:get-kernel-or-error)))
+
 (defun ein:pytools-add-sys-path (kernel)
   (ein:kernel-execute
    kernel

lisp/ein_remote_safe.py

@@ -94,6 +94,8 @@ def __ein_maybe_undefined_object(obj, locals=None):
         return eval(obj, None, locals)
     except Exception:
         return None
+    except SyntaxError:
+        return None
 
 def __ein_print_object_info_for(obj):
     import IPython.core.oinspect