From 92b8954b7063d481521a0d0066d4ea2b78bddef8 Mon Sep 17 00:00:00 2001
From: Jon Mease <jon.mease.dev@gmail.com>
Date: Sat, 27 Feb 2021 13:16:42 -0500
Subject: [PATCH] Display kaleido installation instructions when neither
 kaleido nor orca are installed

---
 packages/python/plotly/plotly/io/_kaleido.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/packages/python/plotly/plotly/io/_kaleido.py b/packages/python/plotly/plotly/io/_kaleido.py
index 2e43239a70..043db05ade 100644
--- a/packages/python/plotly/plotly/io/_kaleido.py
+++ b/packages/python/plotly/plotly/io/_kaleido.py
@@ -92,9 +92,19 @@ def to_image(
     # -------------
     if engine == "auto":
         if scope is not None:
+            # Default to kaleido if available
             engine = "kaleido"
         else:
-            engine = "orca"
+            # See if orca is available
+            from ._orca import validate_executable
+
+            try:
+                validate_executable()
+                engine = "orca"
+            except:
+                # If orca not configured properly, make sure we display the error
+                # message advising the installation of kaleido
+                engine = "kaleido"
 
     if engine == "orca":
         # Fall back to legacy orca image export path