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Date: Tue, 09 Oct 2012 09:26:15 -0500
From: Tim Chase <python.list@tim.thechases.com>
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To: Jussi Piitulainen <jpiitula@ling.helsinki.fi>
Subject: Re: mangled messages
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On 10/09/12 07:05, Jussi Piitulainen wrote:
> Tim Chase writes:
>> However, it might be that there is no CR+LF on the last line,
>> or that one line is missing the CR, so your viewer heuristic
>> (vim does this) thinks it has Unix NL-only line-endings and
>> shows the ^M on all the lines that have the CR.  All for one
>> stray line without.
> 
> That doesn't sound robust. The problem is still quite rare for
> me.

Vim's heuristic is that, if *all* the lines end in CR+LF, it's a
DOS-formatted file; otherwise it's a Unix-style (LF) file with
spurious CRs in it (they just happen to come at the end of
most-but-not-all lines).  It works quite robustly, since writing the
file back out will reliably put the CRs back where they were and
leave the non-CR'ed lines as they were with only LF.  Vim makes it
pretty easy to remove the spurious CRs and then change the
file-format from Unix to DOS line-endings and write it out if that's
what you want[1].

-tkc


[1]
:%s/\r$
:set ff=dos
:w

which (1) removes the spurious/inconsistent CRs, (2) tells vim that
newlines should be written as CR+LF when writing and (3) writes the
file back out to disk.