On 25/06/13 11:15, 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?
regards,
Christian
Looks like a feature, not a bug, to me. Vim does not always follow what
the POSIX pundits decreed from their high thrones that vi “must” do,
especially not in 'nocompatible' mode but not even in 'compatible' mode,
unless $VIM_POSIX is set (or the individual POSIX flags are set in
addition to the 'compatible' ones).
The Vim documentation clearly specifies :s[ubstitute], :sus[pend],
st[op], which, in the notation used in Vim help files, means that:
:s
:su
:sub
:subs
:subst
:substi
:substit
:substitu
:substitut
:substitute
all mean the same,
and (since :stop and :suspend are synonymous not only in Vim but also in
vi and ex):
:sus
:susp
:suspe
:suspen
:suspend
:st
:sto
:stop
also all mean the same.
IMHO the mention of s[ubstitute] and su[spend] in the POSIX manual is
where the bug lies, since it implies that :su would mean _both_ :suspend
and :substitute. Since the popular :s command is a well-known
abbreviation for :substitute, it follows (by analogy with all other
ex-commands used in Vim) that :su, :sub, :subs, etc. mean the same. An
additional letter must be used for :sus[pend] to avoid ambiguity, or
people who want to press as few keys as possible, :st[op] comes to the
rescue.
To have :s = :substitute, :su = :suspend, :sub = :substitute would be
illogical and would add an element of surprise for people like me, who
never used legacy vi.
A cabbrev has been given for those who want it this way nevertheless. Do
we need an additional POSIX flag in 'cpoptions' and a change in the C
code? I personally doubt its utility.
Best regards,
Tony.
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