enable reading from a file instead of stdin

diff --git a/.config/mutt/markdown2html b/.config/mutt/markdown2html
index d5fa609cdc45de0f350840ed1a36d14e320f11cb..327dff28ee7d6e1f0de32a772b5584d4330c9201 100755 (executable)
--- a/.config/mutt/markdown2html
+++ b/.config/mutt/markdown2html
@@ -328,10 +328,11 @@ def main():
     Convert text on stdin to HTML, and print it to stdout, like mutt would
     expect.
     '''
-    html = convert_markdown_to_html(sys.stdin.read())
-    if html:
-        # mutt expects the content type in the first line, so:
-        print(f'text/html\n\n{html}')
+    with open(sys.argv[1], 'r') if len(sys.argv) > 1 else sys.stdin as f:
+        html = convert_markdown_to_html(f.read())
+        if html:
+            # mutt expects the content type in the first line, so:
+            print(f'text/html\n\n{html}')
 
 
 if __name__ == '__main__':