On Thu, Mar 19, 2015 at 3:44 AM, Christian Brabandt <[email protected]>
wrote:
> Am 2015-03-18 23:38, schrieb Christian Bone:
>
>> I haven't used Vim in a while and when I started using it again I
>> noticed this line in $MYVIMRC
>>
>> :nnoremap <f3> :%!awk '!a[$0]{a[$0]=1;print}'<bar>noh<cr>
>>
>> I understand that it's mapping to the F3 key, but I can't figure out
>> what the rest of the line does. Can anyone tell me?
>>
>
> This pipes your current buffer through awk with the awk oneliner:
>
> '!a[$0]{a[$0]=1;print}'
>
> Which I believe is a kind of uniq function.
>
> E.g. each line will be output, if awk hasn't seen it before.
>
> After that the vim command <bar>noh<cr> is executed. I am not
> quite sure about that one, I suspect it is trying to use :noh
> (e.g. disable search highlighting using the :noh command), but
> I wonder why the ':' is missing.
>
> Best,
> Christian
I think there are two problems.
First, the second "!" gets replaced by the previous external command.
I think you want to escape it: '\!a[$0]{...}'.
Second, when the :nnoremap command is executed, the <bar> becomes a
"|" character (pipe) and the <cr> becomes an end-of-line character ... but
the latter is the only thing terminating the :!, meaning that the "|" is
part of the external command. So, after applying the awk filter, you apply
the noh filter. I don't know about you, but I have never heard of noh.
To get something that does not generate errors, I would try this:
nnoremap <F3> :%!awk '\!a[$0]{a[$0]=1;print}'<cr>:noh<cr>
I do not know if that matches the original intent. The awk command does
seem to do what Christian described.
:help :!
:help 'cpoptions'
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