From a48a57bd7b9b3e1d56dd35d19e654baa519ad13d Mon Sep 17 00:00:00 2001
From: Philipp Rudiger <prudiger@anaconda.com>
Date: Sun, 30 Aug 2020 02:09:18 +0200
Subject: [PATCH] Allow rendering to pgf in matplotlib

---
 holoviews/plotting/mpl/renderer.py | 5 +++--
 holoviews/plotting/renderer.py     | 5 ++++-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/holoviews/plotting/mpl/renderer.py b/holoviews/plotting/mpl/renderer.py
index d69a5dc861..ec01c37b93 100644
--- a/holoviews/plotting/mpl/renderer.py
+++ b/holoviews/plotting/mpl/renderer.py
@@ -55,7 +55,8 @@ class MPLRenderer(Renderer):
         The render resolution in dpi (dots per inch)""")
 
     fig = param.ObjectSelector(default='auto',
-                               objects=['png', 'svg', 'pdf', 'html', None, 'auto'], doc="""
+                               objects=['png', 'svg', 'pdf', 'pgf',
+                                        'html', None, 'auto'], doc="""
         Output render format for static figures. If None, no figure
         rendering will occur. """)
 
@@ -71,7 +72,7 @@ class MPLRenderer(Renderer):
     mode = param.ObjectSelector(default='default', objects=['default'])
 
 
-    mode_formats = {'fig':     ['png', 'svg', 'pdf', 'html', None, 'auto'],
+    mode_formats = {'fig':     ['png', 'svg', 'pdf', 'pgf', 'html', None, 'auto'],
                     'holomap': ['widgets', 'scrubber', 'webm','mp4', 'gif',
                                 'html', None, 'auto']}
 
diff --git a/holoviews/plotting/renderer.py b/holoviews/plotting/renderer.py
index 3662501f4c..e87f3a3c1d 100644
--- a/holoviews/plotting/renderer.py
+++ b/holoviews/plotting/renderer.py
@@ -52,6 +52,7 @@
 </video>"""
 PDF_TAG = "<iframe src='{src}' style='width:100%; margin: auto; display: block; {css}'></iframe>"
 HTML_TAG = "{src}"
+INVALID_TAG = "<div>Cannot render {mime_type} in HTML</div>"
 
 HTML_TAGS = {
     'base64': 'data:{mime_type};base64,{b64}', # Use to embed data
@@ -61,7 +62,8 @@
     'webm': VIDEO_TAG,
     'mp4':  VIDEO_TAG,
     'pdf':  PDF_TAG,
-    'html': HTML_TAG
+    'html': HTML_TAG,
+    'pgf':  INVALID_TAG
 }
 
 MIME_TYPES = {
@@ -71,6 +73,7 @@
     'webm': 'video/webm',
     'mp4':  'video/mp4',
     'pdf':  'application/pdf',
+    'pgf':  'text/pgf',
     'html': 'text/html',
     'json': 'text/json',
     'js':   'application/javascript',