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Use caching for foldlevels to improve fold calculation performance #3054

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Use caching for foldlevels to improve fold calculation performance #3054

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b582dcc
perf: use caching for foldlevels
lervag Dec 11, 2024
79e78ee
wip: simplify testing as explained in the issue
lervag Dec 13, 2024
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36 changes: 22 additions & 14 deletions autoload/vimtex/fold.vim
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,10 @@
" Email: [email protected]
"

function! vimtex#fold#init_buffer() abort " {{{1
function! vimtex#fold#init_buffer() abort
let b:__vimtex_fold_lasttick = -1
let b:__vimtex_fold_cache = []

if !g:vimtex_fold_enabled
\ || s:foldmethod_in_modeline() | return | endif

Expand All @@ -31,8 +34,7 @@ function! vimtex#fold#init_buffer() abort " {{{1
endif
endfunction

" }}}1
function! vimtex#fold#init_state(state) abort " {{{1
function! vimtex#fold#init_state(state) abort
"
" Initialize the enabled fold types
"
Expand Down Expand Up @@ -83,9 +85,8 @@ function! vimtex#fold#init_state(state) abort " {{{1
endfor
endfunction

" }}}1

function! vimtex#fold#refresh(map) abort " {{{1
function! vimtex#fold#refresh(map) abort
if &diff
setlocal foldmethod=diff
else
Expand All @@ -95,8 +96,20 @@ function! vimtex#fold#refresh(map) abort " {{{1
endif
endfunction

" }}}1
function! vimtex#fold#level(lnum) abort " {{{1
function! vimtex#fold#level(lnum) abort
if b:__vimtex_fold_lasttick != b:changedtick
let b:__vimtex_fold_lasttick = b:changedtick
let b:__vimtex_fold_cache = []

for l:lnum in range(1, line('$'))
call add(b:__vimtex_fold_cache, s:calculate_fold_level(l:lnum))
endfor
endif

return b:__vimtex_fold_cache[a:lnum - 1]
endfunction

function! s:calculate_fold_level(lnum) abort
let l:line = getline(a:lnum)
let l:next = getline(a:lnum + 1)

Expand All @@ -118,8 +131,7 @@ function! vimtex#fold#level(lnum) abort " {{{1
return '='
endfunction

" }}}1
function! vimtex#fold#text() abort " {{{1
function! vimtex#fold#text() abort
let l:line = getline(v:foldstart)
let l:level = v:foldlevel > 1
\ ? repeat('-', v:foldlevel-2) . g:vimtex_fold_levelmarker
Expand All @@ -133,10 +145,8 @@ function! vimtex#fold#text() abort " {{{1
endfor
endfunction

" }}}1


function! s:foldmethod_in_modeline() abort " {{{1
function! s:foldmethod_in_modeline() abort
let l:cursor_pos = vimtex#pos#get_cursor()
let l:fdm_modeline = 'vim:.*\%(foldmethod\|fdm\)'

Expand All @@ -149,5 +159,3 @@ function! s:foldmethod_in_modeline() abort " {{{1
call vimtex#pos#set_cursor(l:cursor_pos)
return l:check_top || l:check_btm
endfunction

" }}}1
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