#!/bin/env python

# Simple text-wrapping script for email.
# Preserves code blocks, quotes, and signature.
# Author: Daniel Fichtinger
# License: MIT

import textwrap
import sys

paragraph = []
skipping = False

def flush_paragraph():
    if paragraph:
        joined = " ".join(paragraph)
        wrapped = textwrap.wrap(joined, width=74, break_long_words=False, replace_whitespace=True)
        print("\n".join(wrapped))
        paragraph.clear()

for line in sys.stdin:
    line = line.rstrip()

    if line.startswith("```"):
        flush_paragraph()
        skipping = not skipping
        print(line)
    elif line.startswith(">"):
        flush_paragraph()
        print(line)
    elif line.startswith(("- ", "+ ", "* ", "\t", "    ")):
        flush_paragraph()
        print(line)
    elif line.startswith("--"):
        flush_paragraph()
        skipping = True
        print(line)
    elif not line:
        flush_paragraph()
        print(line)
    elif skipping:
        print(line)
    else:
        paragraph.append(line)
else:
    flush_paragraph()