diff --git a/autoload/pymode/folding.vim b/autoload/pymode/folding.vim
index 218520f0..399748e3 100644
--- a/autoload/pymode/folding.vim
+++ b/autoload/pymode/folding.vim
@@ -216,6 +216,15 @@ endfunction "}}}
function! s:Is_opening_folding(lnum) "{{{
" Helper function to see if docstring is opening or closing
+
+ " Cache the result so the loop runs only once per change
+ if get(b:, 'fold_changenr', -1) == changenr()
+ return b:fold_cache[a:lnum] "If odd then it is an opening
+ else
+ let b:fold_changenr = changenr()
+ let b:fold_cache = []
+ endif
+
let number_of_folding = 0 " To be analized if odd/even to inform if it is opening or closing.
let has_open_docstring = 0 " To inform is already has an open docstring.
let extra_docstrings = 0 " To help skipping ''' and """ which are not docstrings
@@ -224,7 +233,9 @@ function! s:Is_opening_folding(lnum) "{{{
" not just triple quotes (that could be a regular string).
"
" Iterater over all lines from the start until current line (inclusive)
- for i in range(1, a:lnum)
+ for i in range(1, line('$'))
+ call add(b:fold_cache, number_of_folding % 2)
+
let i_line = getline(i)
if i_line =~ s:doc_line_regex
@@ -255,11 +266,9 @@ function! s:Is_opening_folding(lnum) "{{{
endif
endfor
- if fmod(number_of_folding, 2) == 1 "If odd then it is an opening
- return 1
- else
- return 0
- endif
+ call add(b:fold_cache, number_of_folding % 2)
+
+ return b:fold_cache[a:lnum]
endfunction "}}}
" vim: fdm=marker:fdl=0
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