codekasten/tycker/tycker.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2012 Lars Kruse <devel@sumpfralle.de>
#
# tycker is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
#
# tycker is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with tycker.  If not, see <http://www.gnu.org/licenses/>.
#


import os
# the basedir is the parent dir of the location of this script
BASE_DIR = os.path.dirname(os.path.abspath(__file__))

# Somehow "/usr/lib/python2.X/dist-packages" is missing from sys.path - thus bobo is not found.
# This applies to libapache2-mod-wsgi (3.3-2).
import sys
for path in list(sys.path):
    options = []
    parent_dir, last_dir = os.path.split(path)
    options.append(os.path.join(path, "dist-packages"))
    options.append(os.path.join(parent_dir, "pymodules", last_dir))
    for option in options:
        if os.path.isdir(option):
            sys.path.append(option)

DATE_FORMAT = "%H:%M %d.%m.%Y"
PAGE_SIZE = 10
FILENAME_TEMPLATE = "ticker%d.html"
FULL_PATH_FILENAME_TEMPLATE = os.path.join(BASE_DIR, os.path.pardir, FILENAME_TEMPLATE)
BASE_URL = "./"

import datetime
import bobo 
import sqlobject
import genshi.template


db_uri = "sqlite:///%s/tycker.sqlite" % BASE_DIR
sqlobject.sqlhub.processConnection = sqlobject.connectionForURI(db_uri)

loader = genshi.template.TemplateLoader(os.path.join(BASE_DIR, 'templates'), auto_reload=True)


class Entry(sqlobject.SQLObject):
    timestamp = sqlobject.DateTimeCol()
    title = sqlobject.UnicodeCol()
    content = sqlobject.UnicodeCol()


def render(filename, **values):
    stream = loader.load(filename).generate(**values)
    return stream.render("html", doctype="html")

def get_filename(index):
    return FULL_PATH_FILENAME_TEMPLATE % index

def get_link(index):
    return FILENAME_TEMPLATE % index

def update_static_html():
    entries = list(Entry.select().orderBy("-timestamp"))
    file_index = 1
    while entries:
        current = entries[:PAGE_SIZE]
        entries = entries[PAGE_SIZE:]
        current_filename = get_filename(file_index)
        if file_index > 1:
            previous_link = get_link(file_index - 1)
        else:
            previous_link = None
        if entries:
            next_link = get_link(file_index + 1)
        else:
            next_link = None
        values = { "entries": current,
                "prev_link": previous_link,
                "next_link": next_link,
        }
        rendered = render("display.html", **values)
        open(current_filename, "w").write(rendered)
        file_index += 1

@bobo.query('/submit')
def submit_entry(entry_id=None, title=None, content=None, date=None):
    title = title.strip()
    content = content.strip()
    if not all((title, content, date)):
        return bobo.redirect(BASE_URL)
    try:
        date = datetime.datetime.strptime(date, DATE_FORMAT)
    except ValueError:
        bobo.redirect(BASE_URL)
    if entry_id is None:
        Entry(title=title, content=content, timestamp=date)
    else:
        try:
            entry = Entry.get(entry_id)
        except sqlobject.SQLObjectNotFound:
            bobo.redirect(BASE_URL)
        entry.title = title
        entry.content = content
        entry.date = date
    update_static_html()
    return bobo.redirect(BASE_URL)

@bobo.query('/delete')
def delete_entry(entry_id):
    try:
        Entry.delete(entry_id)
    except sqlobject.SQLObjectNotFound:
        bobo.redirect(BASE_URL)
    update_static_html()
    return bobo.redirect(BASE_URL)

@bobo.query('/generate')
def generate_static():
    update_static_html()
    return bobo.redirect(BASE_URL)

@bobo.query('/')
def show_entries():
    values = {}
    values["entries"] = Entry.select().orderBy("-timestamp")
    values["date_format"] = DATE_FORMAT
    values["static_url"] = get_link(1)
    return render("admin_show_entries.html", **values)

@bobo.query('')
def redirect_base():
    return bobo.redirect(os.path.split(__file__)[1] + "/")


for table in (Entry, ):
    #table.dropTable()
    if not table.tableExists():
        table.createTable()

application = bobo.Application(bobo_resources=__name__)