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from . import data, css
from ll.xist import xsc
from ll.xist.ns import html
from flask import Flask, url_for
import peewee as pw
import re
import difflib
class DiffSupport:
def __init__(self):
self.inline_style = False
def _diff(self, line1, line2):
diff = list(difflib._mdiff([line1], [line2]))
return (self._format_diff(diff[0][0][1]),
self._format_diff(diff[0][1][1]))
def _diff_lines(self, lines1, lines2):
diff = difflib._mdiff(lines1, lines2)
rows = []
in_change = False
for ((line1, diff1), (line2, diff2), flag) in diff:
if flag ^ in_change:
if flag:
symbol = '↓'
else:
symbol = '↑'
rows.append(html.tr(html.td(' '.join(symbol * 10)),
html.td(' '.join(symbol * 10))))
in_change = flag
rows.append(html.tr(
html.td(*self._format_diff(diff1)),
html.td(*self._format_diff(diff2))
))
return html.table(rows, **{'class': 'textdiff'})
def _format_diff(self, line):
actionclass = {
'+': 'diff_add',
'-': 'diff_sub',
'^': 'diff_chg'}
actionname = {
'+': 'strong',
'-': 'strong',
'^': 'strong'}
elems = []
nextpos = line.find('\x00')
while nextpos != -1 and nextpos + 1 < len(line):
endpos = line.find('\x01', nextpos + 2)
if nextpos != 0: # intermediate unchanged text
elems += [html.span(line[:nextpos])]
text = line[nextpos + 2:endpos]
if self.inline_style:
elem = html.span(text)
elem.xmlname = actionname[line[nextpos + 1]]
elems += [elem]
else:
elems += [html.span(text, **
{'class': actionclass[line[nextpos + 1]]})]
line = line[endpos:]
nextpos = line.find('\x00')
if line != '': # trailing unchanged text
elems += [html.span(line)]
elems += [html.br()]
return elems
class Difftable(html.div, DiffSupport):
def __init__(self, to_version, from_version=None, inline_style=False):
html.div.__init__(self)
DiffSupport.__init__(self)
self.xmlname = 'div'
self.inline_style = inline_style
if from_version == None:
self.single_version(to_version)
else:
self.two_versions(to_version, from_version)
def single_version(self, version):
self.append(html.table(
html.tr(html.th('Title'), html.td(html.a(version.title, href=version.url))),
html.tr(html.th('Authors'), html.td(version.authors)),
html.tr(html.th('Date'), html.td(version.created_date.strftime('%x %X'))),
html.tr(html.th('Text', colspan=2)),
html.tr(html.td(map(html.p, version.text.split('\n')), colspan=2))
))
def two_versions(self, to_version, from_version):
def prepare_text(text):
return re.sub('\n\n\n*', '\n\n', text).split('\n')
from_text = prepare_text(from_version.text)
to_text = prepare_text(to_version.text)
from_difftitle, to_difftitle = self._diff(
from_version.title, to_version.title)
from_authors, to_authors = self._diff(
from_version.authors, to_version.authors)
diff = difflib._mdiff(from_text, to_text)
self.append(html.div(html.table(
html.tr(html.th('Title'),
html.td(html.a(from_difftitle, href=from_version.url)),
html.td(html.a(to_difftitle, href=to_version.url)),
**{'class': 'textdiff'}),
html.tr(html.th('Authors'),
html.td(from_authors),
html.td(to_authors), **{'class': 'textdiff'}),
html.tr(html.th('Date'),
html.td(from_version.created_date.strftime('%x %X')),
html.td(to_version.created_date.strftime('%x %X'))),
html.tr(html.th('Text', colspan=3))),
self._diff_lines(from_text, to_text),
**{'class': 'versiondiff'}
))
class ItemWidget(html.div, DiffSupport):
def __init__(self, item):
html.div.__init__(self)
DiffSupport.__init__(self)
self.append(html.h2(html.a(item.title, href=url_for('item', id=item.id))))
versionsFrom = [None] + list(item.versions)[:-1]
versionsTo = item.versions
versions = list(zip(versionsFrom, versionsTo))
self.append(html.ul(
*map(self.version, versions)))
def version(self, versions):
from_version, to_version = versions
if from_version == None:
title = html.span(to_version.title)
else:
from_difftitle, to_difftitle = self._diff(
from_version.title, to_version.title)
title = html.span(to_difftitle, **{'class': 'textdiff'})
return html.li(html.span(to_version.created_date.strftime('%x %X')),
html.span(' - '),
title)
class Template:
@staticmethod
def template(title, body):
return xsc.Frag(
html.DocTypeXHTML10transitional(), '\n',
html.html(
html.head(
html.meta(charset='utf-8'),
html.title(title),
html.style(css.string(
css.Rule('.textdiff', '.diff_add', backgroundColor='#CEF6CE'),
css.Rule('.textdiff', '.diff_next', backgroundColor='#c0c0c0'),
css.Rule('.textdiff', '.diff_sub', backgroundColor='#FFDADA'),
css.Rule('.textdiff', '.diff_chg', backgroundColor='#E5E1FF')
))
), '\n',
html.body(body)))
@staticmethod
def index(feeds):
return Template.template(
'Index',
html.ul(
*map(lambda feed: html.li(
html.a(feed.title or feed.url, href=url_for('feed', id=feed.id))),
feeds)))
@staticmethod
def feed(feed, items):
return Template.template(
'Feed {}'.format(feed.title or feed.url),
html.div(
html.a('Back', href=url_for('index')),
html.h1(feed.title),
*map(ItemWidget, items)))
@staticmethod
def item(item, versions):
versionsA = versions
versionsB = [None] + versions[:-1]
versions = list(zip(versionsA, versionsB))
return Template.template(
'Item: {}'.format(item.title), html.div(
html.a('Back to {}'.format(item.feed.title), href=url_for('feed', id=item.feed.id)),
html.h1(item.title),
*map(lambda versionAB: html.div(
Difftable(versionAB[0], versionAB[1]),
html.hr()), versions)))
def get_app():
app = Flask(__name__)
@app.route('/')
def index():
return Template.index(data.Feed.select()).string('utf-8')
@app.route('/feed/<id>')
def feed(id):
feed = data.Feed.get(data.Feed.id == id)
counts = (data.Version.select(data.Version.item.alias('item_id'),
pw.fn.Count(data.Version.id).alias('count'))
.group_by(data.Version.item)
.alias('counts'))
items = (data.Item.select()
.join(counts, on=(data.Item.id == counts.c.item_id))
.where((data.Item.feed == feed)
& (counts.c.count > 1))
.order_by(data.Item.created_date.desc()))
return Template.feed(feed, items).string('utf-8')
@app.route('/item/<id>')
def item(id):
item = data.Item.get(data.Item.id == id)
versions = data.Version.select() \
.where(data.Version.item == item) \
.order_by(data.Version.created_date)
return Template.item(item, list(versions)).string('utf-8')
return app
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