##############################################################################
#
# Copyright (c) 2004 A Mennucci
# All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
# 
##############################################################################
import re, os

trigger_re_default=re.compile(r'.*href.*=.*dtml.*sequence-key.*manage_workspace.*',
                              re.I)
before_re_default=re.compile(r' *</div> *', re.I)

def patch(file,
          trigger_re=trigger_re_default,
          before_re=before_re_default):
    """runtime patching of dtml
    returns a file name that can be sent into  Globals.DTMLFile    """
    f=open(ZOPE_HOME+os.path.sep+file)
    base=os.path.basename(file)

    try:
        import tempfile
        #needs python 2.3
        w=tempfile.NamedTemporaryFile(suffix='.dtml')
        newname=w.name
        w.close()
        #see if we can reopen (on Windows NT, we cannot)
        w=open(newname,'w')            
    except:
        newname=INSTANCE_HOME+os.path.sep+'var'+\
                     os.path.sep+base+'_patched_by_ExternalEditor_init.dtml'
        w=open(newname,'w')
        
    a=f.readline()
    flag=0
    while a:
        if flag == 0 and trigger_re.match(a):
            flag=1
        if flag == 1 and before_re.match(a) :
            w.write('       <dtml-var expr="externalEditLink_(this())"><!-- line added by ExternalEditor, by runtime patching when  Zope was started -->\n')
            flag = 2
        w.write(a)
        a=f.readline()
    f.close()
    w.close()
    return newname[:-5]

if __name__ == '__main__' :
    ZOPE_HOME='/usr/lib/zope'
    INSTANCE_HOME='/tmp'
    print patch('lib/python/OFS/dtml/main.dtml')
    print patch('lib/python/OFS/dtml/findResult.dtml')