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Monday, October 24, 2005

Fwd: appending and incrementing the numbers from a particular point

From: Tim Chase
Subject: Re: appending and incrementing the numbers from a particular point
To: Senthil Kumaran

> My requirement is to add more rows with incrementing numbers upto say 2300.
> like:
> 2191 Default SomeText
> 2192 Default SomeText.
> 2193
> 2194
> 2195
> .
> .
> .
> .
> .
> 2300
> ~
> ~
> How should I go about doing this in vim.

Well, there are several ways to go about it (as usual...this *is* vim ;)

The first that comes to mind is something like the following:

:let i=2193 | while (i <= 3000) | put =i | let i=i+1 | endwhile

When executed on the "2192" line, will add a whole bunch of other lines
afterwards. If you want your default text stuff in there too, you can
simply change the "put =i" to

put =i." Default Some Text"

which will pre-populate it with values if you want. If you like to be
left at the top of that inserted stuff, you can try the inverse. On a
blank/emtpy line below "2192", you can do

:let i=3000 | while (i > 2192) | put! =i | let i=i-1 | endwhile

This would be a direct answer to your question of "how to add more rows,
incrementing a number each time".

If, however, you'd like to have it auto-number, something like this
mapping might do the trick for you (all one line):

:inoremap <cr> <cr><c-o>:let i=substitute(getline(line('.')-1),
'^\(\d*\).*', '\1', '')<cr><c-r>=i>0?(i+1).' ':''<cr>

It can be done without a holding "i" variable, but it becomes about
twice as large, as both instances of "i" would be replaced with the
entire contents of the "substitute()" call.

It should gracefully handle lines with numbers and lines without numbers.

Help on the following topics should give you more details on what's
going on there.

:help getline()
:he line()
:he i_^R
:he while
:he let
:he :put
:he substitute()
:he /\d

Hope this helps,

-tim

1 comment:

phoe6 said...

When executed on the "2192" line, will add a whole bunch of other lines
afterwards. If you want your default text stuff in there too, you can
simply change the "put =i" to

put =i." Default Some Text"

If someone is relying on this. The change should be:

put = i . \"Default Text\"

Note the space between the . and escape of quotes.