1 files changed, 45 insertions, 0 deletions
diff --git a/bot/exts/fun/latex/_renderer.py b/bot/exts/fun/latex/_renderer.py
new file mode 100644
index 00000000..3f6528ad
--- /dev/null
+++ b/bot/exts/fun/latex/_renderer.py
@@ -0,0 +1,45 @@
+import sys
+
+from pathlib import Path
+from typing import BinaryIO
+
+import matplotlib.pyplot as plt
+
+# configure fonts and colors for matplotlib
+plt.rcParams.update(
+    {
+        "font.size": 16,
+        "mathtext.fontset": "cm",  # Computer Modern font set
+        "mathtext.rm": "serif",
+        "figure.facecolor": "36393F",  # matches Discord's dark mode background color
+        "text.color": "white",
+    }
+)
+
+
+def render(text: str, file_handle: BinaryIO) -> None:
+    """
+    Saves rendered image in `file_handle`. In case the input is invalid latex, it prints the error to `stderr`.
+    """
+    fig = plt.figure()
+    fig.text(0, 1, text, horizontalalignment="left", verticalalignment="top")
+    try:
+        plt.savefig(file_handle, bbox_inches="tight", dpi=600)
+    except ValueError as err:
+        # get rid of traceback, keeping just the latex error
+        sys.exit(err)
+
+
+def main():
+    """
+    Renders a latex query and saves the output in a specified file.
+    Expects two command line arguments: the query and the path to the output file.
+    """
+    query = sys.argv[1]
+    out_file_path = Path(sys.argv[2])
+    with open(out_file_path, "wb") as out_file:
+        render(query, out_file)
+
+
+if __name__ == "__main__":
+    main()