Re: Filter-like command -- but to insert instead of replacing

On Sat, Feb 11, 2017 at 11:52 AM, Tim Chase <vim@tim.thechases.com> wrote:

On 2017-02-11 11:26, Arun wrote:
> On Sat, Feb 11, 2017 at 2:37 AM, Bram Moolenaar wrote:
>> Perhaps this will work:
>>         :{range}copy {address} !cmd
>>
>
> Just wondering how this would work with :g, hope it wont be
> executing the filter against each line, rather as a whole. It would
> be useful to have a set of lines selected using :g applied against
> a filter. If the output of the filtered command be captured to a
> register (or to a destination line, like copy), that would be
> awesome. Maybe, :g, is not the right command to use, but something
> like that would be useful, IMHO.

The syntax of the :g command allows you to specify ranges for the
subsequent ex commands.  So you can do things like

  :g/pattern/-3,+5t$

to find all the lines matching "pattern" and copy it along with 3
lines of context before and 5 lines of context after to the bottom of
the file.

So with Bram's proposal,

  :g/pattern/copy {address} !cmd

would run "cmd" for each matching line.  But if each /pattern/
finds something within a block you want to process together, you
would be able to do

  :g/pattern/-3,+5copy {address} !cmd

It would still run "cmd" once for every /pattern/, but it wouldn't run
it 9 times for every pattern (3 before + 1 current + 5 after) in this
example.

True, I understand the :g behavior; but was wondering how a group of lines matching a pattern could be fed to the filter in one go, unlike the :g way. The current proposed way would work fine with simple consecutive lines, but would be nice to extend with patterns too. Just a wish.

Regards,

-Arun 

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