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Merge pull request #392 from anowlcalledjosh/yaml-frontmatter-fix
[etc/vim.git] / after / ftplugin / markdown.vim
diff --git a/after/ftplugin/markdown.vim b/after/ftplugin/markdown.vim
index 1916a730cfe901e6fdca2204d807a7d9f699ad91..9ee01006960b118c1a82ddec0958b047496e54db 100644 (file)
--- a/after/ftplugin/markdown.vim
+++ b/after/ftplugin/markdown.vim
@@ -7,13 +7,45 @@
 " original version from Steve Losh's gist: https://gist.github.com/1038710
 
 function! s:is_mkdCode(lnum)
 " original version from Steve Losh's gist: https://gist.github.com/1038710
 
 function! s:is_mkdCode(lnum)
-    return synIDattr(synID(a:lnum, 1, 0), 'name') == 'mkdCode'
+    let name = synIDattr(synID(a:lnum, 1, 0), 'name')
+    return (name =~ '^mkd\%(Code$\|Snippet\)' || name != '' && name !~ '^\%(mkd\|html\)')
 endfunction
 
 if get(g:, "vim_markdown_folding_style_pythonic", 0)
     function! Foldexpr_markdown(lnum)
 endfunction
 
 if get(g:, "vim_markdown_folding_style_pythonic", 0)
     function! Foldexpr_markdown(lnum)
+        let l1 = getline(a:lnum)
+        " keep track of fenced code blocks
+        if l1 =~ '````*' || l1 =~ '\~\~\~\~*'
+            if b:fenced_block == 0
+                let b:fenced_block = 1
+            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)
         let l2 = getline(a:lnum+1)
-        if  l2 =~ '^==\+\s*' && !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*' && !s:is_mkdCode(a:lnum+1)
             " next line is underlined (level 1)
             return '>0'
         elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
@@ -21,7 +53,6 @@ if get(g:, "vim_markdown_folding_style_pythonic", 0)
             return '>1'
         endif
 
             return '>1'
         endif
 
-        let l1 = getline(a:lnum)
         if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
             " current line starts with hashes
             return '>'.(matchend(l1, '^#\+') - 1)
         if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
             " current line starts with hashes
             return '>'.(matchend(l1, '^#\+') - 1)
@@ -52,62 +83,78 @@ else
         else
             let l0 = getline(a:lnum-1)
         endif
         else
             let l0 = getline(a:lnum-1)
         endif
+
         " keep track of fenced code blocks
         " keep track of fenced code blocks
-        if l0 =~ '````*' || l0 =~ '~~~~*'
+        if l0 =~ '````*' || l0 =~ '\~\~\~\~*'
             if b:fenced_block == 0
                 let b:fenced_block = 1
             elseif b:fenced_block == 1
                 let b:fenced_block = 0
             endif
             if b:fenced_block == 0
                 let b:fenced_block = 1
             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*' && !s:is_mkdCode(a:lnum+1)
             " next line is underlined (level 1)
         endif
 
         let l2 = getline(a:lnum+1)
         if  l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
             " next line is underlined (level 1)
-            return 0
+            return '>1'
         elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
             " next line is underlined (level 2)
         elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
             " next line is underlined (level 2)
-            if g:vim_markdown_folding_level == 2
-                return 0
+            if s:vim_markdown_folding_level >= 2
+                return '>1'
             else
             else
-                return 1
+                return '>2'
             endif
         endif
 
         let l1 = getline(a:lnum)
         if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
             " fold level according to option
             endif
         endif
 
         let l1 = getline(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
-                return -1
+            if s:vim_markdown_folding_level == 1 || matchend(l1, '^#\+') > s:vim_markdown_folding_level
+                if a:lnum == line('$')
+                    return matchend(l1, '^#\+') - 1
+                else
+                    return -1
+                endif
             else
             else
-                " code blocks are always folded
-                return b:fenced_block
+                " headers are not folded
+                return 0
             endif
         endif
 
         if l0 =~ '^#' && !s:is_mkdCode(a:lnum-1)
             endif
         endif
 
         if l0 =~ '^#' && !s:is_mkdCode(a:lnum-1)
-            " collapse comments in fenced code blocks into a single fold
-            if b:fenced_block == 1
-                return 1
-            endif
-            " current line starts with hashes
+            " previous line starts with hashes
             return '>'.matchend(l0, '^#\+')
         else
             return '>'.matchend(l0, '^#\+')
         else
-            " fold here because of setext headers
-            return 1
+            " keep previous foldlevel
+            return '='
         endif
     endfunction
 endif
 
 
 let b:fenced_block = 0
         endif
     endfunction
 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)
     setlocal foldmethod=expr
 
 if !get(g:, "vim_markdown_folding_disabled", 0)
     setlocal foldexpr=Foldexpr_markdown(v:lnum)
     setlocal foldmethod=expr
-    if get(g:, "vim_markdown_folding_style_pythonic", 0)
+    if get(g:, "vim_markdown_folding_style_pythonic", 0) && get(g:, "vim_markdown_override_foldtext", 1)
         setlocal foldtext=Foldtext_markdown()
     endif
 endif
         setlocal foldtext=Foldtext_markdown()
     endif
 endif
vim configuration

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