#!/usr/bin/env python3

import argparse
import sys

def count(infile, outfile):

    result = {}
    for _,c in enumerate("abcdefghijklmnopqrstuvwxyz"):
        result[c] = 0

    for word in infile:
        for c in set(word):
            if c != "\n":
                result[c] += 1

    for c, count in sorted([[k,v] for k,v in result.items()],
                           key=lambda kv: kv[1],
                           reverse=True):
        outfile.write("{}: {}\n".format(c,count))


if __name__ == "__main__":

    parser = argparse.ArgumentParser(description="Count, for each letter, in how many words it occurs.")
    parser.add_argument("--in",
                        dest="infile",
                        default="wordlist.txt",
                        type=argparse.FileType("r", encoding="UTF-8"),
                        help="wordlist.txt file as generated by generate-wordlist")
    parser.add_argument("--out",
                        type=argparse.FileType("w", encoding="UTF-8"),
                        required=False,
                        default="lettercount.txt",
                        help="The output file with letters and counts.")
    args = parser.parse_args()
    count(args.infile, args.out)