> 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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