def create_plain

def create_plain_index()

in directory_listing.py [0:0]
56 lines of code
13 McCabe index (conditional complexity)

def create_plain_index(root, dirs, files, dirname=None):
    '''
    Creates the fairly plain HTML folder index
    including a preview of a single image file, if any is present.
    Returns the HTML source as string.

    Args:
        root: string, path to the root directory, all paths in *dirs* and
            *files* are relative to this one
        dirs: list of strings, the directories in *root*
        files: list of string, the files in *root*
        dirname: name to print in the html, which may be different than *root*

    Returns: HTML source of the directory listing
    '''

    if dirname is None:
        dirname = root or '/'

    html = "<!DOCTYPE html>\n"
    html += "<html lang='en'><head>"
    html += "<title>Index of {}</title>\n".format(dirname)
    html += "<meta charset='UTF-8'>\n"
    html += "<style>\n"
    html += "body { font-family: Segoe UI, Helvetica, Arial, sans-serif; }\n"
    html += "a { text-decoration:none; }\n"
    html += "</style>\n"
    html += "</head><body>\n"

    html += "<h1>Index of {}</h1>\n".format(dirname)

    # Insert preview image
    jpg_files = [f for f in files if is_image_file(f)]

    if len(jpg_files) > 0:

        # This is slow, so defaulting to just the first image:
        #
        # Use the largest image file as this is most likely to contain
        # useful content.
        #
        # jpg_file_sizes = [os.path.getsize(f) for f in jpg_files]
        # largest_file_index = max(range(len(jpg_files)), key=lambda x: jpg_file_sizes[x])

        html += "<a href='{0}'><img style='height:200px; float:right;' src='{0}' alt='Preview image'></a>\n".format(jpg_files[0])
    else:
        html += "\n"
        # html += "<p style='width:15em; float:right; margin:0;'>[No preview available]</p>\n"

    if root:
        html += "<p><a href='../index.html'>To parent directory</a></p>\n"
    else:
        html += "\n"
        # html += "<p>This is the root directoy.</p>\n"

    html += "<h2>Folders</h2>\n"
    if len(dirs) > 0:
        html += "<ul style='list-style-type: none; padding-left:1em;'>\n"
        for dir in sorted(dirs):
            html += "<li>&#128193; <a href='{0}/index.html'>{0}</a></li>\n".format(dir)
        html += "</ul>\n"
    else:
        html += "<p style='padding-left:1em;'>No folders</p>\n"

    html += "<h2>Files</h2>\n"
    if len(files) > 0:
        html += "<ul style='list-style-type: none; padding-left:1em;'>\n"
        for fname in sorted(files):
            if is_image_file(fname):
                html += "<li>&#128443; <a href='{0}'>{0}</a></li>\n".format(fname)
            else:
                html += "<li>&#128442; <a href='{0}'>{0}</a></li>\n".format(fname)
        html += "</ul>\n"
    else:
        html += "<p style = 'padding-left:1em;'>No files</p>\n"

    # Add some space at the bottom because the browser's status bar might hide stuff
    html += "<p style='margin:2em;'>&nbsp;</p>\n"
    html += "</body></html>\n"
    return html