Re: vim: problem when searching and displaying certain lines with :global

On Friday, June 15, 2012 9:53:45 AM UTC-5, ping wrote:
>
> [ping] this I tested, yes it works!
> still I think ... here we happen to know which line out of the original
> text will be the matched lines, so we can just specify the line with a
> static number there...what if we don't know (or hard to count)?
>

You might be able to do it using a search pattern as the range to a print command.

> say from these texts snips:
>
> classifier-group dhcp entry 1 <----wanted block
> 313 packets, 118332 bytes
> rate-limit-profile dhcplimit
> committed rate: 1280 bps, committed burst: 8192 bytes <--wanted
> excess burst: 0 bytes
> committed: 313 packets, 118332 bytes, action: transmit <-wanted
> conformed: 0 packets, 0 bytes, action: drop
> exceeded: 0 packets, 0 bytes, action: drop
> classifier-group jnpr-VIDEO-TRAFFIC entry 1 <--not wanted block
> 0 packets, 0 bytes
> rate-limit-profile video-upstream
> committed rate: 218000 bps, committed burst: 32000 bytes
> excess burst: 0 bytes
> committed: 0 packets, 0 bytes, action: transmit
> conformed: 0 packets, 0 bytes, action: drop
> exceeded: 0 packets, 0 bytes, action: drop
> classifier-group jnpr-VIDEO-TRAFFIC entry 2 <--not wanted block
> 0 packets, 0 bytes
> rate-limit-profile video-upstream
> committed rate: 0 bps, committed burst: 0 bytes
> excess burst: 0 bytes
> committed: 0 packets, 0 bytes, action: transmit
> conformed: 0 packets, 0 bytes, action: drop
> exceeded: 0 packets, 0 bytes, action: drop
>
> it is composed by a lot of (around 41 or sometime far more)
> "classifier-group" blocks.
>

But for something this complex I'd probably just write a while loop in a *.vim file, like:

let lineNum = 1
let savedLine = ""
while lineNum < line('$')
let lineTxt = getline(lineNum)
if lineTxt =~ 'some pattern of your choosing'
let savedLine = lineTxt
elseif lineTxt =~ 'some other pattern'
echo savedLine
echo lineTxt
endif
let lineNum += 1
endwhile

Then use :source whatever.vim on the file you want to parse.

If you use this often you can place it in a function and create a command and put it in your .vimrc somewhere:

function! MyPrettyParser()
...while loop from above...
endfunction

command! ParseSomething call MyPrettyParser()

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