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113 lines
4.0 KiB
Python
113 lines
4.0 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 djangorestframework.resources import FormResource
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from djangorestframework.response import Response
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from djangorestframework.renderers import BaseRenderer
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from djangorestframework.utils import reverse
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from djangorestframework.views import View
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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 snippets that we highlight
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HIGHLIGHTED_CODE_DIR = os.path.join(settings.MEDIA_ROOT, 'pygments')
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MAX_FILES = 10
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if not os.path.exists(HIGHLIGHTED_CODE_DIR):
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os.makedirs(HIGHLIGHTED_CODE_DIR)
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def list_dir_sorted_by_ctime(dir):
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"""
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Return a list of files sorted by creation time
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"""
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filepaths = [os.path.join(dir, file) for file in os.listdir(dir) if not file.startswith('.')]
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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=False) ]
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def remove_oldest_files(dir, max_files):
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"""
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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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"""
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[os.remove(path) for path in list_dir_sorted_by_ctime(dir)[max_files:]]
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class HTMLRenderer(BaseRenderer):
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"""
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Basic renderer which just returns the content without any further serialization.
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"""
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media_type = 'text/html'
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class PygmentsRoot(View):
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"""
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This example demonstrates a simple RESTful Web API around 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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"""
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form = PygmentsForm
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def get(self, request):
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"""
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Return a list of all currently existing snippets.
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"""
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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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return Response([reverse('pygments-instance', request, args=[unique_id]) for unique_id in unique_ids])
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def post(self, request):
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"""
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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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"""
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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(self.CONTENT['lexer'])
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linenos = 'table' if self.CONTENT['linenos'] else False
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options = {'title': self.CONTENT['title']} if self.CONTENT['title'] else {}
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formatter = HtmlFormatter(style=self.CONTENT['style'], linenos=linenos, full=True, **options)
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with open(pathname, 'w') as outfile:
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highlight(self.CONTENT['code'], lexer, formatter, outfile)
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remove_oldest_files(HIGHLIGHTED_CODE_DIR, MAX_FILES)
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self.headers['Location'] = reverse('pygments-instance', request, args=[unique_id])
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return Response(status=status.HTTP_201_CREATED)
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class PygmentsInstance(View):
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"""
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Simply return the stored highlighted HTML file with the correct mime type.
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This Resource only renders HTML and uses a standard HTML renderer rather than the renderers.DocumentingHTMLRenderer class.
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"""
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renderer_classes = (HTMLRenderer,)
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def get(self, request, unique_id):
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"""
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Return the highlighted snippet.
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"""
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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 Response(status.HTTP_404_NOT_FOUND)
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return Response(open(pathname, 'r').read())
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def delete(self, request, unique_id):
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"""
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Delete the highlighted snippet.
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"""
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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 Response(status.HTTP_404_NOT_FOUND)
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return Response(os.remove(pathname))
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