runtime(typst): add folding to typst ftplugin
closes: #15897
Signed-off-by: Gregory Anders <greg@gpanders.com>
Signed-off-by: Luca Saccarola <github.e41mv@aleeas.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/autoload/typst.vim b/runtime/autoload/typst.vim
index 55edd23..baf765a 100644
--- a/runtime/autoload/typst.vim
+++ b/runtime/autoload/typst.vim
@@ -1,6 +1,6 @@
" Language: Typst
" Maintainer: Gregory Anders
-" Last Change: 2024-07-14
+" Last Change: 2024 Oct 21
" Based on: https://github.com/kaarmu/typst.vim
function! typst#indentexpr() abort
@@ -31,6 +31,31 @@
return l:ind
endfunction
+function typst#foldexpr()
+ let line = getline(v:lnum)
+
+ " Whenever the user wants to fold nested headers under the parent
+ let nested = get(g:, "typst_foldnested", 1)
+
+ " Regular headers
+ let depth = match(line, '\(^=\+\)\@<=\( .*$\)\@=')
+
+ " Do not fold nested regular headers
+ if depth > 1 && !nested
+ let depth = 1
+ endif
+
+ if depth > 0
+ " check syntax, it should be typstMarkupHeading
+ let syncode = synstack(v:lnum, 1)
+ if len(syncode) > 0 && synIDattr(syncode[0], 'name') ==# 'typstMarkupHeading'
+ return ">" . depth
+ endif
+ endif
+
+ return "="
+endfunction
+
" Gets the previous non-blank line that is not a comment.
function! s:get_prev_nonblank(lnum) abort
let l:lnum = prevnonblank(a:lnum)