Playground for matplotlib/mplfinance#661

.gitignore

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+1-without-liberation-fonts/*
+2-with-liberation-fonts/*
+
+!.keep

Makefile

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+setup:
+	pip install mplfinance pyarrow # install pyarrow only to get rid of pandas warning
+
+test:
+	sudo apt remove -y fonts-liberation
+	rm -f ~/.cache/matplotlib/fontlist-v330.json
+	FILE=1-without-liberation-fonts/image.png python script.py 2> 1-without-liberation-fonts/mpl-debug-logs.txt
+
+	sudo apt update
+	sudo apt install fonts-liberation
+	rm -f ~/.cache/matplotlib/fontlist-v330.json
+	FILE=2-with-liberation-fonts/image.png python script.py 2> 2-with-liberation-fonts/mpl-debug-logs.txt
+
+	echo && md5sum 1-without-liberation-fonts/image.png 2-with-liberation-fonts/image.png && echo
+	echo && tail -n 1 1-without-liberation-fonts/mpl-debug-logs.txt 2-with-liberation-fonts/mpl-debug-logs.txt

README.md

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-# mplfinance
-For matplotlib/mplfinance#661
+1. Run `make setup` - installs the latest `mplfinance`
+
+2. Run `make test`:
+
+- remove fonts-liberation if installed
+- renders the simplest chart
+- installs fonts-liberation
+- renders the chart again
+- prints MD5 sums of the images
+- prints the last lines of the `matplotlib` debug logs

script.py

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+import os
+
+import matplotlib.pyplot as plt
+import pandas as pd
+
+import mplfinance as mpf
+
+plt.set_loglevel("debug")
+
+window = pd.DataFrame(
+    [
+        [2.00, 4.00, 1.00, 3.00],
+    ],
+    columns=["open", "high", "low", "close"],
+)
+
+window.index = pd.date_range("2022-01-01", periods=len(window), freq="D")
+
+mpf.plot(window, type="candle", savefig=os.environ["FILE"])