Reduce unnecessary call `matchend()`

[etc/vim.git] / after / ftplugin / markdown.vim

diff --git a/after/ftplugin/markdown.vim b/after/ftplugin/markdown.vim
index 586ff2f5b001ee8490c5a6f7d6f8e1fd74b8d2ab..6265db3a7b5a466dfe6a4813b1e2adb9f4d2835d 100644 (file)
--- a/after/ftplugin/markdown.vim
+++ b/after/ftplugin/markdown.vim
@@ -21,18 +21,39 @@ if get(g:, "vim_markdown_folding_style_pythonic", 0)
             elseif b:fenced_block == 1
                 let b:fenced_block = 0
             endif
+        elseif g:vim_markdown_frontmatter == 1
+            if b:front_matter == 1 && a:lnum > 2
+                let l0 = getline(a:lnum-1)
+                if l0 == '---'
+                    let b:front_matter = 0
+                endif
+            elseif a:lnum == 1
+                if l1 == '---'
+                    let b:front_matter = 1
+                endif
+            endif
+        endif
+
+        if b:fenced_block == 1 || b:front_matter == 1
+            if a:lnum == 1
+                " fold any 'preamble'
+                return '>1'
+            else
+                " keep previous foldlevel
+                return '='
+            endif
         endif
 
         let l2 = getline(a:lnum+1)
-        if l2 =~ '^==\+\s*' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum+1)
+        if l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
             " next line is underlined (level 1)
             return '>0'
-        elseif l2 =~ '^--\+\s*' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum+1)
+        elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
             " next line is underlined (level 2)
             return '>1'
         endif
 
-        if l1 =~ '^#' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum)
+        if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
             " current line starts with hashes
             return '>'.(matchend(l1, '^#\+') - 1)
         elseif a:lnum == 1
@@ -62,6 +83,7 @@ else
         else
             let l0 = getline(a:lnum-1)
         endif
+
         " keep track of fenced code blocks
         if l0 =~ '````*' || l0 =~ '\~\~\~\~*'
             if b:fenced_block == 0
@@ -69,15 +91,30 @@ else
             elseif b:fenced_block == 1
                 let b:fenced_block = 0
             endif
+        elseif g:vim_markdown_frontmatter == 1
+            if b:front_matter == 1
+                if l0 == '---'
+                    let b:front_matter = 0
+                endif
+            elseif a:lnum == 2
+                if l0 == '---'
+                    let b:front_matter = 1
+                endif
+            endif
+        endif
+
+        if b:fenced_block == 1 || b:front_matter == 1
+            " keep previous foldlevel
+            return '='
         endif
 
         let l2 = getline(a:lnum+1)
-        if  l2 =~ '^==\+\s*' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum+1)
+        if  l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
             " next line is underlined (level 1)
             return '>1'
-        elseif l2 =~ '^--\+\s*' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum+1)
+        elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
             " next line is underlined (level 2)
-            if g:vim_markdown_folding_level >= 2
+            if s:vim_markdown_folding_level >= 2
                 return '>1'
             else
                 return '>2'
@@ -85,10 +122,9 @@ else
         endif
 
         let l1 = getline(a:lnum)
-        if l1 =~ '^#' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum)
+        if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
             " fold level according to option
-            let l:level = matchend(l1, '^#\+')
-            if g:vim_markdown_folding_level == 1 || l:level > g:vim_markdown_folding_level
+            if s:vim_markdown_folding_level == 1 || matchend(l1, '^#\+') > s:vim_markdown_folding_level
                 return -1
             else
                 " headers are not folded
@@ -96,11 +132,11 @@ else
             endif
         endif
 
-        if l0 =~ '^#' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum-1)
+        if l0 =~ '^#' && !s:is_mkdCode(a:lnum-1)
             " current line starts with hashes
             return '>'.matchend(l0, '^#\+')
         else
-            " fold here because of setext headers
+            " keep previous foldlevel
             return '='
         endif
     endfunction
@@ -108,7 +144,8 @@ endif
 
 
 let b:fenced_block = 0
-let g:vim_markdown_folding_level = get(g:, "vim_markdown_folding_level", 1)
+let b:front_matter = 0
+let s:vim_markdown_folding_level = get(g:, "vim_markdown_folding_level", 1)
 
 if !get(g:, "vim_markdown_folding_disabled", 0)
     setlocal foldexpr=Foldexpr_markdown(v:lnum)