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/Demo/cgi/wiki.py

http://unladen-swallow.googlecode.com/
Python | 123 lines | 115 code | 7 blank | 1 comment | 12 complexity | bc14b50c72536292b5f4068537a7645a MD5 | raw file
  1"""Wiki main program.  Imported and run by cgi3.py."""
  2
  3import os, re, cgi, sys, tempfile
  4escape = cgi.escape
  5
  6def main():
  7    form = cgi.FieldStorage()
  8    print "Content-type: text/html"
  9    print
 10    cmd = form.getvalue("cmd", "view")
 11    page = form.getvalue("page", "FrontPage")
 12    wiki = WikiPage(page)
 13    method = getattr(wiki, 'cmd_' + cmd, None) or wiki.cmd_view
 14    method(form)
 15
 16class WikiPage:
 17
 18    homedir = tempfile.gettempdir()
 19    scripturl = os.path.basename(sys.argv[0])
 20
 21    def __init__(self, name):
 22        if not self.iswikiword(name):
 23            raise ValueError, "page name is not a wiki word"
 24        self.name = name
 25        self.load()
 26
 27    def cmd_view(self, form):
 28        print "<h1>", escape(self.splitwikiword(self.name)), "</h1>"
 29        print "<p>"
 30        for line in self.data.splitlines():
 31            line = line.rstrip()
 32            if not line:
 33                print "<p>"
 34            else:
 35                print self.formatline(line)
 36        print "<hr>"
 37        print "<p>", self.mklink("edit", self.name, "Edit this page") + ";"
 38        print self.mklink("view", "FrontPage", "go to front page") + "."
 39
 40    def formatline(self, line):
 41        words = []
 42        for word in re.split('(\W+)', line):
 43            if self.iswikiword(word):
 44                if os.path.isfile(self.mkfile(word)):
 45                    word = self.mklink("view", word, word)
 46                else:
 47                    word = self.mklink("new", word, word + "*")
 48            else:
 49                word = escape(word)
 50            words.append(word)
 51        return "".join(words)
 52
 53    def cmd_edit(self, form, label="Change"):
 54        print "<h1>", label, self.name, "</h1>"
 55        print '<form method="POST" action="%s">' % self.scripturl
 56        s = '<textarea cols="70" rows="20" name="text">%s</textarea>'
 57        print s % self.data
 58        print '<input type="hidden" name="cmd" value="create">'
 59        print '<input type="hidden" name="page" value="%s">' % self.name
 60        print '<br>'
 61        print '<input type="submit" value="%s Page">' % label
 62        print "</form>"
 63
 64    def cmd_create(self, form):
 65        self.data = form.getvalue("text", "").strip()
 66        error = self.store()
 67        if error:
 68            print "<h1>I'm sorry.  That didn't work</h1>"
 69            print "<p>An error occurred while attempting to write the file:"
 70            print "<p>", escape(error)
 71        else:
 72            # Use a redirect directive, to avoid "reload page" problems
 73            print "<head>"
 74            s = '<meta http-equiv="refresh" content="1; URL=%s">'
 75            print s % (self.scripturl + "?cmd=view&page=" + self.name)
 76            print "<head>"
 77            print "<h1>OK</h1>"
 78            print "<p>If nothing happens, please click here:",
 79            print self.mklink("view", self.name, self.name)
 80
 81    def cmd_new(self, form):
 82        self.cmd_edit(form, label="Create")
 83
 84    def iswikiword(self, word):
 85        return re.match("[A-Z][a-z]+([A-Z][a-z]*)+", word)
 86
 87    def splitwikiword(self, word):
 88        chars = []
 89        for c in word:
 90            if chars and c.isupper():
 91                chars.append(' ')
 92            chars.append(c)
 93        return "".join(chars)
 94
 95    def mkfile(self, name=None):
 96        if name is None:
 97            name = self.name
 98        return os.path.join(self.homedir, name + ".txt")
 99
100    def mklink(self, cmd, page, text):
101        link = self.scripturl + "?cmd=" + cmd + "&page=" + page
102        return '<a href="%s">%s</a>' % (link, text)
103
104    def load(self):
105        try:
106            f = open(self.mkfile())
107            data = f.read().strip()
108            f.close()
109        except IOError:
110            data = ""
111        self.data = data
112
113    def store(self):
114        data = self.data
115        try:
116            f = open(self.mkfile(), "w")
117            f.write(data)
118            if data and not data.endswith('\n'):
119                f.write('\n')
120            f.close()
121            return ""
122        except IOError, err:
123            return "IOError: %s" % str(err)