import urllib2
import HTMLParser

class AsyLinkParser(HTMLParser.HTMLParser):
    def handle_starttag(self, tag, attrs):
        if not hasattr(self, "asy_files"):
            self.asy_files = []
        if tag == "a":
            for attr in attrs:
                if attr[0] == "href" and attr[1].endswith(".asy"):
                    self.asy_files.append(attr[1])

gallery_url_base = "http://asymptote.sourceforge.net/gallery/"
parser = AsyLinkParser()
parser.feed(urllib2.urlopen(gallery_url_base + ".index1.html").read())
parser.asy_files[:10]

asy_data = []
skip_urls = ["intro.asy",     # This file is missing
             "exp3.asy",      # Compiling leads to a stack overflow?
             "galleon.asy",   # Requires external data
             "westnile.asy",  # Requires external data
             ]
# These keywords suggest additional asymptote modules or tampering
# with settings in an unexpected way.
skip_list = ["cpkcolors", "embed", "logo", "settings"]
for gallery_url in parser.asy_files:
    if gallery_url in skip_urls:
        continue
    asy_code = urllib2.urlopen(gallery_url_base + gallery_url).read()
    if not any([skip_word in asy_code for skip_word in skip_list]):
        asy_data.append({"code": asy_code, "name": gallery_url})

len(asy_data)

from IPython.display import display, HTML
import asymagic

def display_asy(asy_data, start_index=0, end_index=-1):
    """Display subset of asymptote examples"""
    asy_codes = [tup["code"] for tup in asy_data[start_index : end_index]]
    with asymagic.TemporaryAsymptoteFile(asy_codes) as tmp_asy:
        for i, asy_file in enumerate(tmp_asy.asy_files):
            display(HTML("<a href='{base}/{asy}'>{asy}</a>".format(
                base=gallery_url_base, asy=asy_data[i + start_index]["name"])))
            display(asymagic.run_asy_file(asy_file)[0])

display_asy(asy_data, 0, 10)

display_asy(asy_data, 10, 20)

display_asy(asy_data, 20, 30)

display_asy(asy_data, 30, 40)

display_asy(asy_data, 40, 50)

display_asy(asy_data, -10, -1)