#! /usr/bin/env python

"""finddiv - a grep-like tool that looks for division operators.

Usage: finddiv [-l] file_or_directory ...

For directory arguments, all files in the directory whose name ends in

.py are processed, and subdirectories are processed recursively.

This actually tokenizes the files to avoid false hits in comments or

strings literals.

By default, this prints all lines containing a / or /= operator, in

grep -n style.  With the -l option specified, it prints the filename

of files that contain at least one / or /= operator.

"""

import os

import sys

import getopt

import tokenize

def main():

    try:

        opts, args = getopt.getopt(sys.argv[1:], "lh")

    except getopt.error, msg:

        usage(msg)

        return 2

    if not args:

        usage("at least one file argument is required")

        return 2

    listnames = 0

    for o, a in opts:

        if o == "-h":

            print __doc__

            return

        if o == "-l":

            listnames = 1

    exit = None

    for filename in args:

        x = process(filename, listnames)

        exit = exit or x

    return exit

def usage(msg):

    sys.stderr.write("%s: %s\n" % (sys.argv[0], msg))

    sys.stderr.write("Usage: %s [-l] file ...\n" % sys.argv[0])

    sys.stderr.write("Try `%s -h' for more information.\n" % sys.argv[0])

def process(filename, listnames):

    if os.path.isdir(filename):

        return processdir(filename, listnames)

    try:

        fp = open(filename)

    except IOError, msg:

        sys.stderr.write("Can't open: %s\n" % msg)

        return 1

    g = tokenize.generate_tokens(fp.readline)

    lastrow = None

    for type, token, (row, col), end, line in g:

        if token in ("/", "/="):

            if listnames:

                print filename

                break

            if row != lastrow:

                lastrow = row

                print "%s:%d:%s" % (filename, row, line),

    fp.close()

def processdir(dir, listnames):

    try:

        names = os.listdir(dir)

    except os.error, msg:

        sys.stderr.write("Can't list directory: %s\n" % dir)

        return 1

    files = []

    for name in names:

        fn = os.path.join(dir, name)

        if os.path.normcase(fn).endswith(".py") or os.path.isdir(fn):

            files.append(fn)

    files.sort(lambda a, b: cmp(os.path.normcase(a), os.path.normcase(b)))

    exit = None

    for fn in files:

        x = process(fn, listnames)

        exit = exit or x

    return exit

if __name__ == "__main__":

    sys.exit(main())