fmtcomment

#!/usr/bin/env python
"""
Select some text and then "!fmtcomment".  It understands "//" and
"#" comments, works with indenting in spaces and tabs.  It assumes
you want to squeeze your text within 80-chars, and treats tabs as
4 spaces thusly.

E.g., will turn

// Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. 
// Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. 
//
// Duis aute irure dolor 
// in reprehenderit in voluptate velit esse 
// cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt 
// in culpa qui officia deserunt mollit anim id est laborum.

... into...

// Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod 
// tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
// quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
// consequat.
// 
// Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore
// eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident,
// sunt in culpa qui officia deserunt mollit anim id est laborum.
"""

import re
import sys

lines = sys.stdin.readlines()

if len(lines) < 1:
    print >>sys.stderr, "Line!"
    sys.exit(1)

s = lines[0].rstrip()
m = re.match(r"^\s*(?:#|//)", s)
if not m:
    print >>sys.stderr, "No comment."
    sys.exit(1)
comment = m.group()

words = []
for line in lines:
    sub_words = line.split()
    if len(sub_words) > 0 and sub_words[0] in ("#", "//"):
        sub_words = sub_words[1:]
    if len(sub_words) == 0:
        words.append("\n")
    else:
        words.extend(sub_words)

while words:
    firstword = words.pop(0)
    if firstword == "\n":
        print comment
        continue
    out = comment + " " + firstword
    while words:
        if words[0] == "\n":
            break
        if len(out.expandtabs(4)) + 1 + len(words[0]) <= 80:
            out += " " + words.pop(0)
        else:
            break
    print out