ENH: Configurable highlight style (pdoc3#38)

* Refac: Atom One Light hljs style & css tweaks

* Revert: CSS previous changes. Only keep 12px code

* Add: configurable hljs style. Fixes pdoc3#34

* Rename config.mako option to `hljs_style`

Author: KyleKing

.gitignore

@@ -1,5 +1,6 @@
 dist
 build
+*.eggs/*
 *.egg-info
 *.py[cod]
 

pdoc/templates/config.mako

@@ -5,4 +5,8 @@
     extract_module_toc_into_sidebar = True
     list_class_variables_in_index = True
     sort_identifiers = True
+    # Set the style keyword such as 'atom-one-light' or 'github-gist'
+    #     Options: https://github.com/highlightjs/highlight.js/tree/master/src/styles
+    #     Demo: https://highlightjs.org/static/demo/
+    hljs_style = 'github'
 %>

pdoc/templates/css.mako

@@ -213,6 +213,7 @@
       margin: 0;
     }
     .source pre code {
+      font-size: 12px;
       overflow: visible;
     }
   .hlist {

pdoc/templates/html.mako

@@ -25,6 +25,7 @@
     extract_module_toc_into_sidebar = getattr(config.attr, 'extract_module_toc_into_sidebar', True)
     list_class_variables_in_index = getattr(config.attr, 'list_class_variables_in_index', False)
     sort_identifiers = getattr(config.attr, 'sort_identifiers', True)
+    hljs_style = getattr(config.attr, 'hljs_style', 'github')
 
     link = getattr(config.attr, 'link', link)
     to_html = getattr(config.attr, 'to_html', to_html)
@@ -350,7 +351,7 @@
   <link href='https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.0/normalize.min.css' rel='stylesheet'>
   <link href='https://cdnjs.cloudflare.com/ajax/libs/10up-sanitize.css/8.0.0/sanitize.min.css' rel='stylesheet'>
   % if show_source_code:
-    <link href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/github.min.css" rel="stylesheet">
+    <link href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/${hljs_style}.min.css" rel="stylesheet">
   %endif
 
   <%namespace name="css" file="css.mako" />