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from django.conf import settings
from flywheel.resource import Resource
from flywheel.response import Response, status
from flywheel.emitters import BaseEmitter
from pygments.formatters import HtmlFormatter
from pygments.lexers import get_lexer_by_name
from pygments import highlight
from forms import PygmentsForm
import os
import hashlib
# We need somewhere to store the code that we highlight
HIGHLIGHTED_CODE_DIR = os.path.join(settings.MEDIA_ROOT, 'pygments')
class HTMLEmitter(BaseEmitter):
"""Basic emitter which just returns the content without any further serialization."""
media_type = 'text/html'
class PygmentsRoot(Resource):
"""This example demonstrates a simple RESTful Web API aound the awesome pygments library.
This top level resource is used to create """
form = PygmentsForm
allowed_methods = anon_allowed_methods = ('POST',)
def post(self, request, auth, content):
# Generate a unique id by hashing the input
input_str = ''.join(['%s%s' % (key, content[key]) for key in sorted(content.keys())])
hash = hashlib.md5()
hash.update(input_str)
unique_id = hash.hexdigest()
pathname = os.path.join(HIGHLIGHTED_CODE_DIR, unique_id)
if not os.path.exists(pathname):
# We only need to generate the file if it doesn't already exist.
options = {'title': content['title']} if content['title'] else {}
linenos = 'table' if content['linenos'] else False
lexer = get_lexer_by_name(content['lexer'])
formatter = HtmlFormatter(style=content['style'], linenos=linenos, full=True, **options)
with open(pathname, 'w') as outfile:
highlight(content['code'], lexer, formatter, outfile)
return Response(status.HTTP_201_CREATED, headers={'Location': self.reverse(PygmentsInstance, unique_id)})
class PygmentsInstance(Resource):
"""Simply return the stored highlighted HTML file with the correct mime type.
This Resource only emits HTML and uses a standard HTML emitter rather than FlyWheel's DocumentingHTMLEmitter class."""
allowed_methods = anon_allowed_methods = ('GET',)
emitters = (HTMLEmitter,)
def get(self, request, auth, unique_id):
pathname = os.path.join(HIGHLIGHTED_CODE_DIR, unique_id)
if not os.path.exists(pathname):
return Resource(status.HTTP_404_NOT_FOUND)
return open(pathname, 'r').read()
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