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#!/bin/sed -f
# justify.sed - aur�lio marinho jargas <verde (a) aurelio net>
#
# it gets a text already wrapped on the desired number of columns
# and add extra white spaces, from left to right, word by word,
# to justify all the lines. there is a maximum of 5 spaces to be
# inserted between the words. if this limit is reached, the line
# is not justified (come on, more than 5 is horrible). empty
# lines are ignored. btw, this comments were justified with this
# script &:)
#
# 20000715 1st release
# 20000722 code cleaned
# cleaning extra spaces of the line
s/ \+/ /g
s/^ //
s/ $//
# we'll only justify lines with less than 65 chars
/^.\{65\}/b
# backup of the 'stripped' line
h
# spaces -> pattern
# convert series of spaces to a internal pattern `n
:s2p
s/ /`5/g
s/ /`4/g
s/ /`3/g
s/ /`2/g
s/ /`1/g
t 1space
b
# pattern -> spaces
# restore the spaces converted to the internal pattern `n
:p2s
s/`5/ /g
s/`4/ /g
s/`3/ /g
s/`2/ /g
s/`1/ /g
t check
b
# check if we've reached our right limit
# if not, continue adding spaces
:check
/^.\{65\}/!b s2p
b
# here's the "magic":
# add 1 space to the first and minor internal pattern found.
# this way, the extra spaces are always added from left to right,
# always balanced, one by one.
# right after the substitution, we'll restore the spaces and
# test if our limit was reached.
:1space
s/`1/`2/ ; t p2s
s/`2/`3/ ; t p2s
s/`3/`4/ ; t p2s
s/`4/`5/ ; t p2s
# we don't want to justify with more than 5 added spaces between
# words, so let's restore the original line
/`5/x
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