Re: Can you explain to me what this script is doing?

2015-03-03 17:17 GMT+03:00 at <atorgovitsky@gmail.com>:

I found the following code on a stackexchange post: http://tex.stackexchange.com/questions/1548/intelligent-paragraph-reflowing-in-vim

The code is for environment-aware formatting in LaTeX.

It's not longer working quite the way I want it---I think it is interacting with one of my other plugins that has been updated---so I'd like to try to modify it. However I don't have a great knowledge of the Vim scripting language, so I don't really understand what's going on in the code. Could someone explain it to me?

You better explain how it is interacting. Based on the kind of interaction it may appear that you need to know only a few lines. The code below simply selects lines between some lines like `\start`…`    \start` and tells Vim to reformat them.

Basically you need to know `:h range`, `:h gq` and, if you still don't understand other code, `:h :{command}` where `:{command}` is a lowercase letter sequence at the start of the line with colon prepended.

 

Alternatively/additionally, if you have a good solution for formatting in LaTeX, please share!

Here's the code. It's also on the Stackexchange post in case the formatting gets messed up:

" Reformat lines (getting the spacing correct) {{{
fun! TeX_fmt()
    if (getline(".") != "")
    let save_cursor = getpos(".")
        let op_wrapscan = &wrapscan
        set nowrapscan
        let par_begin = '^\(%D\)\=\s*\($\|\\start\|\\stop\|\\Start\|\\Stop\|\\\(sub\)*section\>\|\\item\>\|\\NC\>\|\\blank\>\|\\noindent\>\)'
        let par_end   = '^\(%D\)\=\s*\($\|\\start\|\\stop\|\\Start\|\\Stop\|\\place\|\\\(sub\)*section\>\|\\item\>\|\\NC\>\|\\blank\>\)'
    try
      exe '?'.par_begin.'?+'
    catch /E384/
      1
    endtry
        norm V
    try
      exe '/'.par_end.'/-'
    catch /E385/
      $
    endtry
    norm gq
        let &wrapscan = op_wrapscan
    call setpos('.', save_cursor)
    endif
endfun

nmap Q :call TeX_fmt()<CR>

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