Merge pull request #1508 from ggaaooppeenngg/custom-font-recipe

Add recipe for installing custom fonts

Author: mathbunnyru

docs/using/recipes.md

@@ -549,3 +549,20 @@ RUN echo "from pyspark.sql import SparkSession" > /tmp/init-delta.py && \
     python /tmp/init-delta.py && \
     rm /tmp/init-delta.py
 ```
+
+## Add Custom Font in Scipy notebook
+
+The example below is a Dockerfile to load Source Han Sans with normal weight which is usually used for web.
+
+```dockerfile
+FROM jupyter/scipy-notebook:latest
+
+RUN PYV=$(ls "${CONDA_DIR}/lib" | grep ^python) && \
+    MPL_DATA="${CONDA_DIR}/lib/${PYV}/site-packages/matplotlib/mpl-data" && \
+    wget --quiet -P "${MPL_DATA}/fonts/ttf/" https://mirrors.cloud.tencent.com/adobe-fonts/source-han-sans/SubsetOTF/CN/SourceHanSansCN-Normal.otf && \
+    sed -i 's/#font.family/font.family/g' "${MPL_DATA}/matplotlibrc" && \
+    sed -i 's/#font.sans-serif:/font.sans-serif: Source Han Sans CN,/g' "${MPL_DATA}/matplotlibrc" && \
+    sed -i 's/#axes.unicode_minus: True/axes.unicode_minus: False/g' "${MPL_DATA}/matplotlibrc" && \
+    rm -rf "/home/${NB_USER}/.cache/matplotlib" && \
+    python -c 'import matplotlib.font_manager;print("font loaded: ",("Source Han Sans CN" in [f.name for f in matplotlib.font_manager.fontManager.ttflist]))'
+```