Peptified code to get a better visualization

converters/reveal.py

@@ -1,146 +1,156 b''
 from converters.markdown import ConverterMarkdown
 from IPython.utils.text import indent
 import io
 import os
 import itertools
 
 class ConverterReveal(ConverterMarkdown):
-    """Convert a notebook to a html slideshow.
+    """
+    Convert a notebook to a html slideshow.
 
     It generates a static html slideshow based in markdown and reveal.js.
+    The delimiters for each slide, subslide, and fragment are retrieved
+    from the 'slideshow' metadata.
     """
 
     def __init__(self, infile, highlight_source=False, show_prompts=True,
                  inline_prompt=True):
         super(ConverterMarkdown, self).__init__(infile)
         self.highlight_source = highlight_source
         self.show_prompts = show_prompts
         self.inline_prompt = inline_prompt
 
     def switch_meta(self, m_list):
         "switch metadata delimiters order to build properly the slides" 
         if len(m_list) > 1:
             if not (len(m_list) == 2 and m_list[1] == [u'new_fragment = True']):
                 m_list[0], m_list[1] = m_list[1], m_list[0]
         return m_list
 
     def meta2str(self, meta):
-        "transform metadata dictionary to a string containing delimiters for slides"
+        "transform metadata dict to a string containing delimiters for slides"
         try:
             meta_tuple = meta[u'slideshow'].items()
         except KeyError as e:
             meta_tuple = ()
         meta_list = [[x + ' = ' + unicode(y)] for x, y in meta_tuple]
         meta_list = self.switch_meta(meta_list)
         return u'\n'.join(list(itertools.chain(*meta_list)))
 
     def render_heading(self, cell):
-        return [self.meta2str(cell.metadata), '{0} {1}'.format('#' * cell.level, cell.source), '']
+        return [self.meta2str(cell.metadata),
+            '{0} {1}'.format('#' * cell.level, cell.source), '']
 
     def render_markdown(self, cell):
         return [self.meta2str(cell.metadata), cell.source, '']
 
     def render_raw(self, cell):
         if self.raw_as_verbatim:
-            return [indent(self.meta2str(cell.metadata)), indent(cell.source), '']
+            return [indent(self.meta2str(cell.metadata)),
+                indent(cell.source), '']
         else:
             return [self.meta2str(cell.metadata), cell.source, '']
 
     def convert(self, cell_separator='\n'):
         """
         Generic method to converts notebook to a string representation.
 
         This is accomplished by dispatching on the cell_type, so subclasses of
         Convereter class do not need to re-implement this method, but just
         need implementation for the methods that will be dispatched.
 
         Parameters
         ----------
         cell_separator : string
           Character or string to join cells with. Default is "\n"
 
         Returns
         -------
         out : string
         """
         lines = []
         lines.extend(self.optional_header())
         begin = ['<div class="reveal"><div class="slides">']
         lines.extend(begin)
         slides_list = self.build_slides(cell_separator)
         lines.extend(slides_list)
         end = ['</div></div>']
         lines.extend(end)
         lines.extend(self.optional_footer())
         return u'\n'.join(lines)
 
     def build_slides(self, cell_separator='\n'):
         "build the slides structure from text list and delimiters"
         text = self.main_body(cell_separator)
-        delim_false = [u'new_section = False', u'new_subsection = False', u'new_fragment = False']
+        delim_false = [u'new_section = False',
+                       u'new_subsection = False',
+                       u'new_fragment = False']
         text = [x for x in text if not x in delim_false]
         left = '<section data-markdown><script type="text/template">'
         right = '</script></section>'
-        slides = [list(x[1]) for x in itertools.groupby(text, lambda x: x==u'new_section = True') if not x[0]] 
+        slides = [list(x[1]) for x in itertools.groupby(text,
+            lambda x: x == u'new_section = True') if not x[0]]
         for slide in slides:
             slide.insert(0, u'')
             slide.insert(0,left)
             slide.append(right)
             if slide[2] == u'new_subsection = True':
                 slide.pop(2)
                 slide.insert(0,'<section>')
                 slide.append('</section>')
                 for i,j in enumerate(slide):
                     if j == u'new_subsection = True':
                         slide[i] = right + left
                         slide.insert(i + 1, u'')
             elif slide[4] == u'new_subsection = True':
                 slide[4] = right
                 slide.insert(5, u'')
                 slide.insert(5,left)  
                 slide.insert(5,'<section>')
                 slide.append('</section>')
                 for i,j in enumerate(slide):
                     if j == u'new_subsection = True':
                         slide[i] = right + left
                         slide.insert(i + 1, u'')
             for i,j in enumerate(slide):
                 if j == u'new_fragment = True':
                     slide[i] = '<p class="fragment">'
                     slide[i + 2] = '</p>'
                     slide.insert(i + 3, u'')
         return list(itertools.chain(*slides))
 
     def save(self, outfile=None, encoding=None):
         "read and parse notebook into self.nb"
         if outfile is None:
             outfile = self.outbase + '_slides.' + 'html'
         if encoding is None:
             encoding = self.default_encoding
         with io.open(outfile, 'w', encoding=encoding) as f:
             f.write(self.output)
         return os.path.abspath(outfile)
 
     def template_read(self):
         "read the reveal_template.html"
         here = os.path.split(os.path.realpath(__file__))[0]
-        reveal_template = os.path.join(here, '..', 'templates', 'reveal_base.html')
+        reveal_template = os.path.join(here, '..', 'templates',
+            'reveal_base.html')
         with io.open(reveal_template, 'r', encoding='utf-8') as f:
             template = f.readlines()
-        template = map(lambda s: s.strip(), template) # cosmetic one to get short html files
+        template = [s.strip() for s in template]  # cosmetic one
         return template
 
     def template_split(self):
         "split the reveal_template.html in header and footer lists"
         temp = self.template_read()
-        splitted_temp = [list(x[1]) for x in itertools.groupby(temp, lambda x: x==u'%slides%') if not x[0]]
+        splitted_temp = [list(x[1]) for x in itertools.groupby(temp,
+            lambda x: x == u'%slides%') if not x[0]]
         return splitted_temp  
 
     def optional_header(self):
         optional_header_body = self.template_split()
         return optional_header_body[0]
 
     def optional_footer(self):
         optional_footer_body = self.template_split()
         return optional_footer_body[1]