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import sys
import re

def glue_xml_lines(xml):
    new_xml = ""
    previous_line_empty = True
    for line in xml:
        if re.match(b'^[ \t]*$', line):
            new_xml = b''.join((new_xml, line))
            previous_line_empty = True
        elif previous_line_empty:
            new_xml = b''.join((new_xml, line))
            previous_line_empty = False
        elif line.startswith('<'):
            new_xml = b''.join((new_xml, line))
        elif new_xml.endswith('>\n'):
            new_xml = b''.join((new_xml, line))
        else:
            new_xml = b'  \n'.join((new_xml[:-1], line))

    return new_xml

def read_xml_file(filename):
    xml = []

    with open(filename, 'rb') as fd:
        for line in fd:
            # These explode etree and are useless
            if b'<atom:link rel=' in line:
                continue
            xml.append(line)

    return glue_xml_lines(xml)

for filename in sys.argv[1:]:
    result = read_xml_file(filename)
    output = open(filename+".new", 'wb')
    output.write(result)
    output.close()

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