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138312Re: compatibility with Sun's original vi for command :su

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  • Bram Moolenaar
    Jun 25, 2013
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      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.



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



      Synopsis: su[spend][!]

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

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