vim:ftplugin:markdown: Fold by sections

.config/vim/ftplugin/markdown.vim

@@ -4,3 +4,10 @@ setlocal formatoptions+=aw
 
 " Turn on line-wrapping
 setlocal wrap
+
+" Fold by sections
+function MdSectionFold()
+	let depth = len(matchstr(getline(v:lnum), '^#*'))
+	return depth ? ">" . depth : "="
+endfunction
+setlocal foldmethod=expr foldexpr=MdSectionFold()