Search a pattern and fold the matching lines in gvim

Question

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Hi ,

I want to fold set of lines after search as follows,

The mouse can also be used to open and close folds by following steps:

• Click on a '+' to open the closed fold at this row.

• Click on any other non-blank character to close the open fold at this row

I want to search click and collapse all matching lines.

The mouse can also be used to open and close folds by followingsteps:

+--

There is a method to collapse the patterns which are not matching in vim , after searching a pattern we can collapse non matching patterns by "\z" key .

nnoremap \z :setlocal foldexpr=(getline(v:lnum)=~@/)?0:(getline(v:lnum-1)=~@/)\\|\\|(getline(v:lnum+1)=~@/)?1:2 foldmethod=expr foldlevel=0 foldcolumn=2<CR> Is there any option to do the opposite? Just find a pattern and collapse?

Answer 1

I got an answer to this question from reddit user on reddit vim forum.

https://www.reddit.com/r/vim/comments/91qz90/search_a_pattern_and_fold_the_matching_lines_in/

function! FoldSearchPattern() abort
    if !exists('w:foldpatterns')
        let w:foldpatterns=[]
        setlocal foldmethod=expr foldlevel=0 foldcolumn=2
    endif
    if index(w:foldpatterns, @/) == -1
        call add(w:foldpatterns, @/)
        setlocal foldexpr=SetFolds(v:lnum)
    endif
endfunction

function! SetFolds(lnum) abort
    for pattern in w:foldpatterns
        if getline(a:lnum) =~ pattern
            if getline(a:lnum + 1) !~ pattern
                return 's1'
            else
                return 1
            endif
        endif
    endfor
endfunction

nnoremap \z :call FoldSearchPattern()<CR>

Hope it is helpful.