lcfold

#! /bin/sed -Ef

# lcfold - fold lines using one space character for line continuation
# Copyright (C) 2018-2019  Erik Auerswald <auerswal@unix-ag.uni-kl.de>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Fold (break) long lines by adding '\n ' as done e.g. in LDIF (RFC 2849),
# iCalendar (RFC 5545), or HTTP (RFC 2616). This script uses a hardcoded
# maximum line length of 72 characters.
#
# This script breaks a line after 72 characters, any subsequents breaks
# of the same input line occur after 71 characters because of the <space>
# character added to the output.

s/(.{72})(.)/\1\n \2/
t MORE
b END
: MORE
P
D
: END