On 23/03/10 00:32, John Beckett wrote:
Tinou wrote:
nnoremap<silent> * :call histadd("search",
expand("<cword>"))<bar> let @/='\<'.expand("<cword>").'\>'
<bar> set hlsearch<CR>
Hmmm ... now I'm confused about<expr>.
The help example makes sense:
:inoremap<expr> . InsertDot()
But is<expr> ever needed with nnoremap?
I'm wondering because in this tip:
http://vim.wikia.com/wiki/Highlight_all_search_pattern_matches
we have this method to highlight matches without moving:
:nnoremap<F8> :let @/='\<<C-R>=expand("<cword>")<CR>\>'<CR>:set hls<CR>
However, it has just been demonstrated that the<C-R>= stuff
is superfluous (I had thought it was necessary if not using
<expr>).
Here is Tinou's mapping tweaked for a little simplification:
" Highlight current word without moving cursor; update history.
:nnoremap<silent> <F8> :let @/='\<'.expand("<cword>").'\>'<Bar>set hls<Bar>call
histadd("search",@/)<CR>
I guess I'll put the above in the tip.
John
The {rhs} of this mapping is a :let statement, which evaluates the
expression found after the equal sign.
If you want the _whole_ {rhs} to be the result of evaluating an
expression when the mapping is run, for example a
(boolean?iftrue:iffalse) conditional expression, or the return value of
a function call, then you need the <expr> modifier.
If you just want to evaluate an expression when the mapping is
_defined_, you wrap the macro definition in an :exe statement and don't
use <expr>.
Best regards,
Tony.
--
Conscience is a mother-in-law whose visit never ends.
-- H. L. Mencken
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