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function! gitgutter#fold#enable()
call s:save_fold_state()
call s:set_fold_levels()
setlocal foldexpr=gitgutter#fold#level(v:lnum)
setlocal foldmethod=expr
setlocal foldlevel=0
setlocal foldenable
call gitgutter#utility#setbufvar(bufnr(''), 'folded', 1)
endfunction
function! gitgutter#fold#disable()
call s:restore_fold_state()
call gitgutter#utility#setbufvar(bufnr(''), 'folded', 0)
endfunction
function! gitgutter#fold#toggle()
if s:folded()
call gitgutter#fold#disable()
else
call gitgutter#fold#enable()
endif
endfunction
function! gitgutter#fold#level(lnum)
return gitgutter#utility#getbufvar(bufnr(''), 'fold_levels')[a:lnum]
endfunction
function! gitgutter#fold#foldtext()
if !gitgutter#fold#is_changed()
return foldtext()
endif
return substitute(foldtext(), ':', ' (*):', '')
endfunction
" Returns 1 if any of the folded lines have been changed
" (added, removed, or modified), 0 otherwise.
function! gitgutter#fold#is_changed()
for hunk in gitgutter#hunk#hunks(bufnr(''))
let hunk_begin = hunk[2]
let hunk_end = hunk[2] + (hunk[3] == 0 ? 1 : hunk[3])
if hunk_end < v:foldstart
continue
endif
if hunk_begin > v:foldend
break
endif
return 1
endfor
return 0
endfunction
" A line in a hunk has a fold level of 0.
" A line within 3 lines of a hunk has a fold level of 1.
" All other lines have a fold level of 2.
function! s:set_fold_levels()
let fold_levels = ['']
for lnum in range(1, line('$'))
let in_hunk = gitgutter#hunk#in_hunk(lnum)
call add(fold_levels, (in_hunk ? 0 : 2))
endfor
let lines_of_context = 3
for lnum in range(1, line('$'))
if fold_levels[lnum] == 2
let pre = lnum >= 3 ? lnum - lines_of_context : 0
let post = lnum + lines_of_context
if index(fold_levels[pre:post], 0) != -1
let fold_levels[lnum] = 1
endif
endif
endfor
call gitgutter#utility#setbufvar(bufnr(''), 'fold_levels', fold_levels)
endfunction
function! s:save_fold_state()
let bufnr = bufnr('')
call gitgutter#utility#setbufvar(bufnr, 'foldlevel', &foldlevel)
call gitgutter#utility#setbufvar(bufnr, 'foldmethod', &foldmethod)
if &foldmethod ==# 'manual'
mkview
endif
endfunction
function! s:restore_fold_state()
let bufnr = bufnr('')
let &foldlevel = gitgutter#utility#getbufvar(bufnr, 'foldlevel')
let &foldmethod = gitgutter#utility#getbufvar(bufnr, 'foldmethod')
if &foldmethod ==# 'manual'
loadview
else
normal! zx
endif
endfunction
function! s:folded()
return gitgutter#utility#getbufvar(bufnr(''), 'folded')
endfunction
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