Fall back on markdown if pandoc isn't available

This is less than ideal, but I think it'll suffice for now

setup.py

@@ -1,9 +1,14 @@
 import os
 import contextlib
 import pathlib
+import shutil
 from setuptools import setup, find_packages
 
-import pandoc
+has_pandoc = True
+try:
+ import pandoc
+except ImportError:
+ has_pandoc = False
 
 import metafunctions
 
@@ -17,10 +22,13 @@ def md_to_rst(dir_):
  dir_ = pathlib.Path(dir_)
  rstfiles = []
  for mdfile in dir_.glob('*.md'):
- doc = pandoc.Document()
- doc.markdown = mdfile.read_bytes()
  rstfile = mdfile.with_suffix('.rst')
- rstfile.write_bytes(doc.rst)
+ if has_pandoc:
+ doc = pandoc.Document()
+ doc.markdown = mdfile.read_bytes()
+ rstfile.write_bytes(doc.rst)
+ else:
+ shutil.copy(mdfile, rstfile)
  rstfiles.append(rstfile)
 
  yield rstfiles