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91 lines
3.8 KiB
Python
91 lines
3.8 KiB
Python
from __future__ import with_statement # for python 2.5
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from django.conf import settings
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from django.core.urlresolvers import reverse
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from djangorestframework.resource import Resource
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from djangorestframework.response import Response
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from djangorestframework.emitters import BaseEmitter
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from djangorestframework import status
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from pygments.formatters import HtmlFormatter
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from pygments.lexers import get_lexer_by_name
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from pygments import highlight
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from forms import PygmentsForm
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import os
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import uuid
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import operator
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# We need somewhere to store the code that we highlight
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HIGHLIGHTED_CODE_DIR = os.path.join(settings.MEDIA_ROOT, 'pygments')
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MAX_FILES = 20
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def list_dir_sorted_by_ctime(dir):
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"""Return a list of files sorted by creation time"""
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filepaths = [os.path.join(dir, file) for file in os.listdir(dir)]
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return [item[0] for item in sorted([(path, os.path.getctime(path)) for path in filepaths],
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key=operator.itemgetter(1), reverse=True)]
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def remove_oldest_files(dir, max_files):
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"""Remove the oldest files in a directory 'dir', leaving at most 'max_files' remaining.
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We use this to limit the number of resources in the sandbox."""
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[os.remove(path) for path in list_dir_sorted_by_ctime(dir)[max_files:]]
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class HTMLEmitter(BaseEmitter):
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"""Basic emitter which just returns the content without any further serialization."""
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media_type = 'text/html'
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class PygmentsRoot(Resource):
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"""This example demonstrates a simple RESTful Web API aound the awesome pygments library.
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This top level resource is used to create highlighted code snippets, and to list all the existing code snippets."""
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form = PygmentsForm
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allowed_methods = anon_allowed_methods = ('GET', 'POST',)
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def get(self, request, auth):
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"""Return a list of all currently existing snippets."""
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unique_ids = [os.path.split(f)[1] for f in list_dir_sorted_by_ctime(HIGHLIGHTED_CODE_DIR)]
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unique_ids.reverse()
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return [reverse('pygments-instance', args=[unique_id]) for unique_id in unique_ids]
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def post(self, request, auth, content):
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"""Create a new highlighed snippet and return it's location.
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For the purposes of the sandbox example, also ensure we delete the oldest snippets if we have > MAX_FILES."""
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unique_id = str(uuid.uuid1())
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pathname = os.path.join(HIGHLIGHTED_CODE_DIR, unique_id)
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lexer = get_lexer_by_name(content['lexer'])
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linenos = 'table' if content['linenos'] else False
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options = {'title': content['title']} if content['title'] else {}
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formatter = HtmlFormatter(style=content['style'], linenos=linenos, full=True, **options)
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with open(pathname, 'w') as outfile:
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highlight(content['code'], lexer, formatter, outfile)
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remove_oldest_files(HIGHLIGHTED_CODE_DIR, MAX_FILES)
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return Response(status.HTTP_201_CREATED, headers={'Location': reverse('pygments-instance', args=[unique_id])})
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class PygmentsInstance(Resource):
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"""Simply return the stored highlighted HTML file with the correct mime type.
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This Resource only emits HTML and uses a standard HTML emitter rather than the emitters.DocumentingHTMLEmitter class."""
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allowed_methods = anon_allowed_methods = ('GET',)
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emitters = (HTMLEmitter,)
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def get(self, request, auth, unique_id):
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"""Return the highlighted snippet."""
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pathname = os.path.join(HIGHLIGHTED_CODE_DIR, unique_id)
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if not os.path.exists(pathname):
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return Resource(status.HTTP_404_NOT_FOUND)
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return open(pathname, 'r').read()
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def delete(self, request, auth, unique_id):
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"""Delete the highlighted snippet."""
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pathname = os.path.join(HIGHLIGHTED_CODE_DIR, unique_id)
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if not os.path.exists(pathname):
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return Resource(status.HTTP_404_NOT_FOUND)
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return os.remove(pathname)
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