On 2014-08-07, dhulme wrote:
> Sorry, I tried to water down the issue to the point that I failed
> to demonstrate the issue.
No problem. I appreciate the effort. My "explanation" was more a
collection of facts than an explanation. I'll try again here.
> The issue is:
>
> *** It doesn't load the viminfo at all when I use use -u ***
That's correct. My understanding is that it should not, unless the
file specified by -u sets 'nocompatible' or you also use -N.
When you use -u, you are putting vim into compatible mode, as I
wrote before and as explained in ":help -u".
In compatible mode, vim initializes 'viminfo' to empty. I can't
find anyplace where that is stated explicitly, but ":help 'viminfo'"
says,
Vi default: ""
The Vi default is what you would expect when 'compatible' is set,
and some experimentation shows it to be true.
Further in that :help section it says,
When non-empty, the viminfo file is read upon startup and
written when exiting Vim.
That implies that when 'viminfo' is empty, the viminfo file is _not_
read.
In summary, using -u sets 'viminfo' to empty which causes the
viminfo file to not be read.
When you _don't_ use -u, then vim uses several means to determine
whether it is in compatible or nocompatible mode, including
detecting the presence of a vimrc file. (See ":help 'compatible'"
and ":help compatible-default".) If vim detects a ~/.vimrc file, it
will set 'nocompatible'.
In nocompatible mode on Unix, vim initializes 'viminfo' to
'100,<50,s10,h
This is non-empty. Therefore, vim reads the viminfo file upon
startup.
> What am I missing?
>
> I don't have any global vimrc etc., that I can see. But if I did,
> should -u ~/.vimrc change any of that vs. the default option to
> load ~/.vimrc?
Yes, as explained above.
You can see if a system/global vimrc was read by executing
:scriptnames
and looking at the first line or two.
> This test was done with the following vim:
>
> ----------------------------------------
>
> VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Jun 1 2014 17:05:47)
> Included patches: 1-316
> Compiled by <[email protected]>
The Cygwin vim package doesn't include a system vimrc file. CentOS
might. Fedora does.
I hope that's clear.
Regards,
Gary
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