On 22/07/11 9:56 AM, Jose Caballero wrote:
Hi,
I am trying to write a function to comment all lines of code in a block.
Note the main purpose for this is to educate myself on vim scripting, given I am
quite new with it. I am sure there are many other solutions to do it, and much
better, but I want to do it in this way to learn.
I have written this [1] so far.
The idea is to search backwards the first blank line, and then forwards. Once I
have all lines that are not blanks, I just add '#' at the beginning of each one.
It works unless the block is at the very end of the document, for example. In
that
case the search for the 'lastline' fails. Same if the block is at the very
beginning.
Any tip or suggestion to fix that?
You could make the regex match at the end of the document, though I
think that will probably make your adjustment mess up and omit the last
line:
let lastline = search('^\s*$\|\%$', 'nW') - 1
Or you could just check whether the search fails or not:
let lastline = search('^\s*$', 'nW')
let lastline = lastline == -1 ? line('$') : lastline - 1
Just a couple of thoughts to get you started. I haven't tested.
:help expr1
:help line()
:help /\%$
Ben.
P.S. Since you mentioned that you're learning Vimscript, here is a
different approach, which is probably the one I would take for starters.
I would think "How would I do this if I were just doing it manually?"
The answer is that I would highlight the current paragraph by using vip
then change to visual block mode with Ctrl-v and then use I to add the
comment leader. I could instruct Vim to do this in Vimscript using a
one-liner:
exec "normal vip\<C-v>I# \<Esc>"
:help :normal
:help :exec
:help expr-string
:help <>
:help CTRL-V
:help v_b_I
[1]
function Comment()
let firstline = search('^\s*$', 'bnW') + 1
let lastline = search('^\s*$', 'nW') - 1
for linenum in range(firstline, lastline)
let oldline = getline(linenum)
let newline = '#'.oldline
call setline(linenum, newline)
endfor
endfunction
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