DOC use sphinx-rtd-theme even if built locally

doc/conf.py

@@ -14,6 +14,7 @@
 
 import sys
 import os
+on_rtd = os.getenv('READTHEDOCS') == 'True'
 
 # 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
@@ -56,7 +57,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = u'python-escpos'
-copyright = u'2015, Manuel F Martinez and others'
+copyright = u'2016, Manuel F Martinez and others'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -110,7 +111,16 @@ pygments_style = 'sphinx'
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'default'
+if on_rtd:
+    html_theme = 'default'
+else:
+    try:
+        import sphinx_rtd_theme
+        html_theme = 'sphinx_rtd_theme'
+        html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+    except ImportError:
+        print("no sphinx_rtd_theme found, switching to nature")
+        html_theme = 'default'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the

doc/requirements.txt

@@ -2,3 +2,4 @@ pyusb
 Pillow>=2.0
 qrcode>=4.0
 pyserial
+sphinx-rtd-theme