diff options
Diffstat (limited to 'watchnews/web.py')
| -rw-r--r-- | watchnews/web.py | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/watchnews/web.py b/watchnews/web.py new file mode 100644 index 0000000..438e649 --- /dev/null +++ b/watchnews/web.py @@ -0,0 +1,207 @@ +from . import data, css + +from ll.xist import xsc, parse +from ll.xist.ns import html +from flask import Flask, url_for + +import re +import difflib + + +class DiffSupport: + + 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 = [] + for ((line1, diff1), (line2, diff2), flag) in diff: + rows.append(html.tr( + html.th(), + html.td(line1), + html.td(*self._format_diff(diff1)), + html.td(line2), + html.td(*self._format_diff(diff2)) + )) + return html.table(rows, **{'class': 'textdiff'}) + + def _format_diff(self, line): + elems = [] + nextpos = line.find("\x00") + while nextpos != -1 and nextpos + 1 < len(line): + actionclass = { + '+': 'diff_add', '-': 'diff_sub', + '^': 'diff_chg'}[line[nextpos + 1]] + endpos = line.find("\x01", nextpos + 2) + + if nextpos != 0: # intermediate unchanged text + elems += [html.span(line[:nextpos])] + + text = line[nextpos + 2:endpos] + elems += [html.span(text, **{'class': actionclass})] + + line = line[endpos:] + nextpos = line.find("\x00") + + if line != "": # trailing unchanged text + elems += [html.span(line)] + return elems + + +class Difftable(html.div, DiffSupport): + + def __init__(self, to_version, from_version=None): + super().__init__() + 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(version.title)), + html.tr(html.th("Date"), html.td( + version.created_date.strftime("%x %X"))), + html.tr(html.th("Link"), html.td( + html.a(version.url, href=version.url))), + 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) + + diff = difflib._mdiff(from_text, to_text) + self.append(html.table( + html.tr(html.th("Title"), + html.td(from_difftitle), + html.td(to_difftitle), **{'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("Link"), + html.td(html.a(from_version.url, href=from_version.url)), + html.td(html.a(to_version.url, href=to_version.url))), + html.tr(html.th("Text", colspan=3)), + html.tr(html.td(self._diff_lines(from_text, to_text), colspan=3)), + **{'class': "versiondiff"} + )) + + +class ItemWidget(html.div, DiffSupport): + + def __init__(self, item): + super().__init__() + 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) + items = data.Item.select() \ + .where(data.Item.feed == feed) \ + .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 + |