# script to read an xml file, and pull down (via wget) the ted talks from them.
import os

def box(num, low, up):
    if (low = num):
        return 1
    if (num >= up):
        return 2
    return 0

def main(ptr, start, stop):
    f = open(ptr, "r")
    fname = ""
    count = 0;
    while True:
        s = f.readline()
        if "file name=" in s:
            count += 1
            print count
            if box(count, start, stop) == 0:
                fname = s.split('"')[1]
                fname = fname.split("/")[1]
                f.readline()
                u = f.readline()[33:-7]
                os.system('wget -c -O "talks/%s" %s' % (fname, u))
                #print 'wget -c -O "talks/%s" %s' % (fname, u)
            elif box(count, start, stop) == 2:
                break
        elif "</metalink>" in s:
            break
    f.close()

if __name__ == "__main__":
    import sys
    if len(sys.argv) != 4:
        print "Expected 3 args. <filename> <start> <stop>"
    else:
        main(sys.argv[1], int(sys.argv[2]), int(sys.argv[3]))