convert source code files to pdf format in python

 import os

 import sys

 def find_file(root_dir, type):

     dirs_pool = [root_dir]

     dest_pool = []

     def scan_dir(directory):

         entries = os.walk(directory)

         for root, dirs, files in entries:

             dirs_pool.extend([os.path.join(root, dir_entry) for dir_entry in dirs])

             for file_entry in files:

                 if type in str(file_entry)[-len(type):]:

                     dest_pool.append(''.join(os.path.join(root, file_entry)))

     while dirs_pool:

         scan_dir(dirs_pool.pop())

     return dest_pool

 def gen_ps(root_dir, type):

     vim_cmd = 'vim -me -e -c ":hardcopy >%.ps" -c ":q" '

     ps2pdf_cmd = 'ps2pdf {filename}.ps {filename}.pdf'

     dests = find_file(root_dir, type)

     if not dests:

         return

     print 'found these source code files:'

     for dest in dests:

         print dest

     print 'begin generate ps files!'

     for dest in dests:

         command = ''.join([vim_cmd, dest])

         print command

         os.system(command)

     for dest in dests:

         command = ps2pdf_cmd.format(filename=dest)

         print command

         os.system(command)

 if __name__ == '__main__':

     if len(sys.argv) == 3:

         gen_ps(sys.argv[1], sys.argv[2])

     else:

         print 'usage: python code2pdf.py directory filetype\n' \

               'such as: python code2pdf.py /home/bruce/python .py'

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