adapt py-nbconvert to newer py-jinja2 (based on changes in newer py-nbconvert;

not done a full update as that needs a new port nbclient)

devel/py-nbconvert/Makefile

@@ -3,7 +3,7 @@ COMMENT =		converting Jupyter notebooks
 MODPY_EGG_VERSION =	5.6.1
 DISTNAME =		nbconvert-${MODPY_EGG_VERSION}
 PKGNAME =		py-${DISTNAME}
-REVISION =		0
+REVISION =		1
 
 CATEGORIES =		devel
 

devel/py-nbconvert/patches/patch-nbconvert_exporters_html_py

@@ -7,3 +7,12 @@ Index: nbconvert/exporters/html.py
  """HTML Exporter class"""
  
  # Copyright (c) Jupyter Development Team.
+@@ -9,7 +10,7 @@ import os
+ from traitlets import default, Unicode
+ from traitlets.config import Config
+ from jupyter_core.paths import jupyter_path
+-from jinja2 import contextfilter
++from jinja2 import pass_context as contextfilter
+ 
+ from nbconvert.filters.highlight import Highlight2HTML
+ from nbconvert.filters.markdown_mistune import IPythonRenderer, MarkdownWithMath