clean up setuptools usage

doc/conf.py

@@ -15,11 +15,9 @@
 import sys
 import os
 
+from importlib.metadata import version as imp_version
+
 on_rtd = os.getenv("READTHEDOCS") == "True"
-if on_rtd:
-    import escpos
-else:
-    from setuptools_scm import get_version
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -75,14 +73,9 @@ copyright = u"2016, Manuel F Martinez and others"
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-if on_rtd:
-    # The full version, including alpha/beta/rc tags.
-    release = escpos.__version__
-else:
-    # locally setuptools_scm should work
-    release = get_version(root=root)
+release = imp_version("python-escpos")
 # The short X.Y version.
-version = ".".join(release.split(".")[:2])  # The short X.Y version.
+version = ".".join(release.split(".")[:2])
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

tox.ini

@@ -31,6 +31,7 @@ deps = sphinx>=3.0.0
        setuptools_scm
        python-barcode
        sphinxcontrib-spelling>=7.2.0
+       sphinx_rtd_theme
 commands = sphinx-build -W -b html -d {envtmpdir}/doctrees .  {envtmpdir}/html
 
 [testenv:flake8]