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|
# -*- coding: utf-8 -*-
"""
simplewiki.utils
~~~~~~~~~~~~~~~~
This module implements various utility functions and classes used all
over the application.
:copyright: (c) 2009 by the Werkzeug Team, see AUTHORS for more details.
:license: BSD.
"""
import difflib
import creoleparser
from os import path
from genshi import Stream
from genshi.template import TemplateLoader
from werkzeug.local import Local, LocalManager
from werkzeug.urls import url_encode, url_quote
from werkzeug.utils import cached_property, redirect
from werkzeug.wrappers import BaseRequest, BaseResponse
# calculate the path to the templates an create the template loader
TEMPLATE_PATH = path.join(path.dirname(__file__), 'templates')
template_loader = TemplateLoader(TEMPLATE_PATH, auto_reload=True,
variable_lookup='lenient')
# context locals. these two objects are use by the application to
# bind objects to the current context. A context is defined as the
# current thread and the current greenlet if there is greenlet support.
local = Local()
local_manager = LocalManager([local])
request = local('request')
application = local('application')
# create a new creole parser
creole_parser = creoleparser.Parser(
dialect=creoleparser.create_dialect(creoleparser.creole10_base,
wiki_links_base_url='',
wiki_links_path_func=lambda page_name: href(page_name),
wiki_links_space_char='_',
no_wiki_monospace=True
),
method='html'
)
def generate_template(template_name, **context):
"""Load and generate a template."""
context.update(
href=href,
format_datetime=format_datetime
)
return template_loader.load(template_name).generate(**context)
def parse_creole(markup):
"""Parse some creole markup and create a genshi stream."""
return creole_parser.generate(markup)
def href(*args, **kw):
"""
Simple function for URL generation. Position arguments are used for the
URL path and keyword arguments are used for the url parameters.
"""
result = [(request and request.script_root or '') + '/']
for idx, arg in enumerate(args):
result.append((idx and '/' or '') + url_quote(arg))
if kw:
result.append('?' + url_encode(kw))
return ''.join(result)
def format_datetime(obj):
"""Format a datetime object."""
return obj.strftime('%Y-%m-%d %H:%M')
class Request(BaseRequest):
"""
Simple request subclass that allows to bind the object to the
current context.
"""
def bind_to_context(self):
local.request = self
class Response(BaseResponse):
"""
Encapsulates a WSGI response. Unlike the default response object werkzeug
provides, this accepts a genshi stream and will automatically render it
to html. This makes it possible to switch to xhtml or html5 easily.
"""
default_mimetype = 'text/html'
def __init__(self, response=None, status=200, headers=None, mimetype=None,
content_type=None):
if isinstance(response, Stream):
response = response.render('html', encoding=None, doctype='html')
BaseResponse.__init__(self, response, status, headers, mimetype,
content_type)
class Pagination(object):
"""
Paginate a SQLAlchemy query object.
"""
def __init__(self, query, per_page, page, link):
self.query = query
self.per_page = per_page
self.page = page
self.link = link
self._count = None
@cached_property
def entries(self):
return self.query.offset((self.page - 1) * self.per_page) \
.limit(self.per_page).all()
@property
def has_previous(self):
return self.page > 1
@property
def has_next(self):
return self.page < self.pages
@property
def previous(self):
return href(self.link, page=self.page - 1)
@property
def next(self):
return href(self.link, page=self.page + 1)
@cached_property
def count(self):
return self.query.count()
@property
def pages(self):
return max(0, self.count - 1) // self.per_page + 1
|
