Tuesday, June 25, 2013

Re: compatibility with Sun's original vi for command :su

Christian Brabandt wrote:

> On Mon, June 24, 2013 23:54, Paul Maier wrote:
> > Hi,
> >
> > the original vi on Sun took :su as :suspend,
> > whereas vim takes :su as :substitute.
> >
> > I am very used to typing :su.
> >
> > Would it be possible for VIM 7.4 to add a new compatibility flag to
> > cpoptions
> > about the meaning of :su ?
> >
> > suggested compatible flag: :su = :suspend, :s = :substitute
> > without the flag: :su = :substitute
> >
>
> Looks like a bug to me. POSIX also requires :su to be used for
> :suspend (http://pubs.opengroup.org/onlinepubs/007908799/xcu/ex.html)
>
> Do we need a new cpo setting here, or should it be enough to
> patch vim to take :su as :suspend?

The POSIX spec has a bug: it says that :s means :substitute, which means
anything starting with :s means :substitute, including :su. But then
:suspend can be abbreviated to :su, that's a conflict.

Relevant quotes:

For each of the commands listed below, the command can be
entered as the abbreviation (those characters in the Synopsis
command word preceding the [), the full command (all characters
shown for the command word, omitting the [ and ]), or any subset
of the characters of the full command down to the abbreviation.
For example, the args command (shown as ar[gs] in the Synopsis)
can be entered as ar, arg or args.

[...]

Substitute

Synopsis: [range] s[ubstitute] [/pattern/repl/[options] [count] [flags]]

[...]

Suspend

Synopsis: su[spend][!]


Making an exception for :su to mean :suspend instead of :substitute
would be weird.

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