Re: How to switch two strings?

On Wed, December 2, 2009 3:14 am, Peng Yu wrote:
>
>
> On Dec 1, 11:12 am, Christian Brabandt <cbli...@256bit.org> wrote:
>> Hi Peng!
>>
>> On Di, 01 Dez 2009, Peng Yu wrote:
>>
>> > I frequently need to switch two strings. For example, if I want to
>> > switch 'a' and 'b', I shall use the following three commands. I'm
>> > wondering if there is a more convenient way to do so.
>>
>> > :%s/b/c/g
>> > :%s/a/b/g
>> > :%s/c/a/g
>>
>> fu! <SID>SwapWords(...) range
>>     if len(a:000)!= 2
>>         echomsg "SwapWords has to be called with 2 Arguments!"
>>         return
>>     elseif (search(a:1 ,'n') == 0 || search(a:2, 'n') == 0)
>>         echomsg "not both args found"
>>         return
>>     endif
>>
>>     let pat=join(map(copy(a:000), '"\\%(" .v:val. "\\)"'), '\|')
>>     :exe a:firstline . ',' . a:lastline . 's/'.pat.
>> '/\=printf("%s",submatch(0)==a:1 ? a:2 : a:1 )/'
>> endfu
>>
>> com! -nargs=+ -range=% Swap :<line1>,<line2>call
>> <SID>SwapWords(<f-args>)
>>
>> :Swap a b
>
> I try the above command in a file that has on the following line.
>
> a b
>
> But it only replaces 'a' with 'b' but not 'b' with 'a'.

Oh yes,
Change this line:
:exe a:firstline . ',' . a:lastline .
's/'.pat.'/\=printf("%s",submatch(0)==a:1 ? a:2 : a:1 )/'

to

:exe a:firstline . ',' . a:lastline .
's/'.pat.'/\=printf("%s",submatch(0)==a:1 ? a:2 : a:1 )/g'

regards,
Christian

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