##
## WebAppWiki: an example program for the webAppWorkshop list
## version: 0.1 (0518.2002)
##
## --------------------------------------------------------------------
## Copyright (C) 2002 Sabren Enterprises, Inc <michal@sabren.com>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program 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
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
## USA
## --------------------------------------------------------------------


## configuration ##################

DATADIR = "./pages"


### code starts here ##############

import os.path
import re
import sys
import zebra
from sixthday import App

class WikiException(Exception):
    pass


class WikiApp(App):

    ## class variables ######################

    # regexp to match WikiWords (stolen from PikiPiki)
    # note the r'' (raw string) syntax, which keeps
    # us from having to write \\ for the backslashes.

    reWikiWord = re.compile(r'^([A-Z][a-z]+){2,}$')

    ## constructor ##########################

    def __init__(self, input, datadir):
        super(WikiApp, self).__init__(input)
        self.dir = datadir

    ## helper methods #######################

    def error(self, message):
        raise WikiException, message
    
    def ensurePage(self):
        res = self.input.get("page")
        if not res:
            self.error("no PageName provided!")
        if not self.reWikiWord.match(res):
            self.error("invalid PageName: " + res)            
        return res

    def getFileName(self, page):
        return self.dir + "/" + page + ".txt"

    def getText(self, page):
        file = self.getFileName(page)
        if os.path.exists(file):
            res = open(file).read()
        else:
            res = "Describe %s here." % page
        return res


    # This next routine formats the page.
    # It's very primitive, and destructive with whitespace.
    # HTML should work fine, (except for PRE tags)
    # Still, this would be a good place to start improving!
    
    def wikify(self, text):
        res = ""
        for line in text.split("\n"):
            if line.strip() == "":
                res += "<br>&nbsp;<br>"
            else:
                # line[:-1] here strips out the newline for now:
                for word in line[:-1].split(" "):
                    if self.reWikiWord.match(word):
                        res += '<a href="wiki.app?action=show&page=%s">%s</a> ' \
                               % (word, word)
                    else:
                        res += word + ' '
                res += "\n"
        return res


    # each App has a .model - It's just a normal dictionary,
    # but handy for passing to template engines.
    # (it also usually collects error messages, but not in
    # this app)

    def prepModel(self, wikify=0):
        page = self.ensurePage()
        self.model["page"] = page
        if wikify:
            self.model["text"] = self.wikify(self.getText(page))
        else:
            self.model["text"] = self.getText(page)            
        return self.model


    ## actions ##############################

    # These methods are special. Apps look for
    # an "action" argument in the query string or
    # form data, and invoke the appropriate method.
    #
    # eg, wiki.app?action=show calls act_show()
    #
    # act_() is the default.
    
    def act_(self):
        self.input.setdefault("page","FrontPage")
        self.act_show()


    def act_show(self):        
        print >> self, zebra.fetch("sho_page", self.prepModel(wikify=1))


    def act_edit(self):
        print >> self, zebra.fetch("sho_form", self.prepModel())

        
    def act_save(self):
        page = self.ensurePage()
        open(self.getFileName(page), "w").write(self.input["text"])
        self.redirect("wiki.app?action=show&page=%s" % page)


if __name__=="__main__":
    try:
        print >> RES, WikiApp(REQ, DATADIR).act()
    except WikiException, e:
        # we do this to hide the detailed stack trace
        # that weblib normally provides:
        print >> RES, "Error:", str(e)