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Path: utzoo!mnetor!uunet!seismo!esosun!cogen!alen
From: alen@cogen.UUCP (Alen Shapiro)
Newsgroups: comp.unix.questions
Subject: Re: Invisible Ascii with VI
Message-ID: <371@cogen.UUCP>
Date: Tue, 6-Oct-87 14:57:10 EDT
Article-I.D.: cogen.371
Posted: Tue Oct  6 14:57:10 1987
Date-Received: Fri, 9-Oct-87 06:42:45 EDT
References: <258@unx1.UUCP> <469@devon.UUCP> <8807@mimsy.UUCP> <250@hobbes.UUCP> <1805@ncr-sd.SanDiego.NCR.COM>
Reply-To: alen@cogen.UUCP (Alen Shapiro)
Organization: Cogensys, LaJolla, Calf.
Lines: 42
Keywords: hack miracle - the impossible takes a little longer
Summary: how to cheat and win at vi

In article <1805@ncr-sd.SanDiego.NCR.COM> geoff@ncr-sd.SanDiego.NCR.COM (Geoffrey R. Walton) writes:
>In article <250@hobbes.UUCP> root@hobbes.UUCP (John Plocher) writes:
>>+---- chris@mimsy.UUCP (Chris Torek) writes in <8807@mimsy.UUCP> ----
>><< a problem with removing trailing ^M's from lines in vi >>
>>| 	: % s / ^V ^M $ / /
>>| works fine for me.
>>| (Going the *other* way---adding ^Ms---is another matter entirely.)
>What's wrong with:
>:g/$/s//
>This, of course, supposes that you want to insert a blank line
>between each line of existing text.  (That isn't what you want
>to do?  OK, I give up.  Why _DO_ you want to add "hard" carriage
>returns to the lines in your file?)

if you REALLY want to do this in vi - try this (it works on the sun)
and has the added advantage of not adding ^Ms to lines already ending in
one.

vi your favourite file - (/etc/termcap will do)
do the following;
/[^ ^V ^M $]/<CR>	# no spaces in the real thing though
A ^V ^M <ESC>		# again no spaces - this should add a ^M to a line
" m y <space>		# put the ^M int reg 'M' (one real space on this line)
:map v n"mpV<CR>	# def macro v to find line with no ^M at end and add one
:map V v<CR>		# recurse till 'n' fails

type V or v to vi and watch the fun before your very eyes. Of course a
5 line C program would be quicker but who needs efficiency when you can
watch vi do its stuff.

The two tricks 1) using a register for the ^M and 2) using a preset search
strings are necessary on the sun cos a ^M in a macro is taken to act as a
<NL> and square brackets in a search string within a macro confused our
version of vi.

enjoy

--alen the Lisa slayer (it's a long story)
	...seismo!esosun!cogen!alen

ps one good reason for wanting to perform this function is to prepare
a text file for an os which demands <CR><LF> at the end of each line.