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#! /usr/bin/env python
################################################################################
# jsprocess.py, merge javascript files into main Python file                   #
# Copyright (C) 2009 Konstantin Ignatiev, ignatiev@users.sourceforge.net       #
#                                                                              #
# This program is distributed under the terms of GNU General Public License,   #
# version 2, as published by the Free Software Foundation.                     #
# See <URL:http://www.fsf.org/licenses/gpl.txt>                                #
#                                                                              #
# ########## Informal subversion log ###########################################
# 147 2010-04-30 Fixed generated string
# 131 2009-07-22 Initial version
################################################################################

import os, re, sys, getopt

hshort = """%(exe)s, version 0.1
Usage: %(exe)s [options] <input files>""" % {'exe': os.path.basename(sys.argv[0])}
hlong = """Options:
      --inplace  -i       Overwrite input files
      --output   -O       Output file
                 -I <dir> add dir to search for JS files"""
try:
    opts, args = getopt.gnu_getopt(sys.argv[1:], "hiI:O:",
                                   ["help","--inplace","-output"])
except getopt.GetoptError, (msg):
    raise Exception(msg)
if not args : opts.append ( ("-h",None) )
inplace = False
jspath = ['.']
out_file = None
for opt, val in opts :
    if opt in ["-h","--help"] :
        if opt == "-h" : print hshort, "\nUse '--help' for more info"
        else : print hshort, "\n", hlong
        sys.exit(0)
    elif opt in ["-i", "--inplace"] : inplace = True
    elif opt in ["-I"] : jspath.append ( val )
    elif opt in ["-O","--output"] : out_file = val
    else : raise Exception("Option %r not handled" % ((opt,val),))
    
if len(args) > 1 and out_file is None :
    raise Exception ( "Cannot use --output with > 1 input files" )

for file in args :
    fh = open(file)
    c = fh.read()
    fh.close ()
    jsfiles = [m.group(1) for m in re.compile(r'inline_js\s*\(\s*[\'"](.+?)[\'"]\s*\)').finditer(c)]
    jscon = {}
    for jf in jsfiles :
        a = [os.path.join(p,jf) for p in jspath if os.path.exists(os.path.join(p,jf))]
        if a :
            cmd = "java -classpath %(home)s/classpath/js.jar -jar %(home)s/classpath/shrinksafe.jar %(js)s | %(home)s/bin/jsmin.py" % \
                {'js' : a[0], 'home' : os.environ['HOME']}
            ph = os.popen ( cmd )
            jscon[jf] = ph.read ()
            ph.close ()
        else :
            print "could not find file '%s'" % jf
    if not jscon :
        print "File '%s' : nothing to substitute, skipping...." % file
        continue
    inline_func = """def inline_js ( fname ) :
    if False :
        return "<SCRIPT src=\\\\"%s\\\\" type=\\\\"text/javascript\\\\">\\\\n</SCRIPT>\\\\n" % fname
""" + "\n".join(["""    elif fname == "%s" :
        return r'''<SCRIPT type="text/javascript">%s\\n</SCRIPT>''' """ %
                 (jf,jscon[jf]) for jf in jsfiles if jf in jscon]) + """
    else :
        raise Exception("Invalid input file '%s'" % fname )

"""        
    exfun = re.compile(r"^def inline_js.+\n([ \t]+.*?('''(.|\n)+?''').*\n|[ \t]+.*\n|\n)+", re.MULTILINE)
    if exfun.search(c) :
        c = exfun.sub ( inline_func, c )
    else :
        # This does look like weird way to write c += inline_func,
        # but it's not the same thing: Perl substitution treats '\' differently,
        # thus re-interpreting the string
        # Thus we do it to keept his processing consistent with the other case.
        c = re.compile("$").subn ( inline_func, c + "\n\n", 1 )[0]

    if inplace :
        fh = open ( file, "w" )
        fh.write ( c )
        fh.close ()
        print "File %s modified" % file
    elif out_file is not None :
        fh = open ( out_file, "w" )
        fh.write ( c )
        fh.close ()
        print "File %s created" % out_file
    else :
        print "%d JS files substituted OK, use '--output' to get rusuls" % len(jscon.keys())