Yaml metadata, fix regex (#1287)

autoload/vimwiki/vars.vim

@@ -820,20 +820,15 @@ function! s:get_common_syntaxlocal() abort
   " Declare helper: a line with only --- or ...
   let rx_yaml_start_pre = '\%(^\%(\%1l\|^$\n\)\@<=\)'
   let rx_yaml_start_post = '\%(\%(\n^$\)\@!$\)'
-  let a_yaml_region = []
-  for rx_yaml_delimiter in ['---', '\.\.\.']
-    let rx_yaml_start = rx_yaml_start_pre . rx_yaml_delimiter . rx_yaml_start_post
-    let rx_yaml_stop = '^' . rx_yaml_delimiter . '$'
-    call add(a_yaml_region, [rx_yaml_start, rx_yaml_stop])
-  endfor
+  let rx_yaml_start = rx_yaml_start_pre . '---' . rx_yaml_start_post
+  let rx_yaml_stop = '^' . '\%(---\|\.\.\.\)' . '$'
 
   let res.nested_extended = {'type': type(''), 'default': 'VimwikiError,VimwikiPre,VimwikiCode,VimwikiEqIn,VimwikiSuperScript,VimwikiSubScript,textSnipTEX'}
   let res.nested_typeface = {'type': type(''), 'default': 'VimwikiBold,VimwikiItalic,VimwikiUnderline,VimwikiDelText'}
   let res.nested = {'type': type(''), 'default': res.nested_extended.default . ',' . res.nested_typeface.default}
   let res.rxTableSep = {'type': type(''), 'default': '|'}
   " See issue #1287
-  let res.yaml_metadata_block = {'type': type([]), 'default': a_yaml_region}
-
+  let res.yaml_metadata_block = {'type': type([]), 'default': [[rx_yaml_start, rx_yaml_stop]]}
 
   " Declare helper for inline math nested variable
   let s:rx_inline_math_start = '\%(^\|[^$\\]\)\@<=\$\%($\|[^$[:space:]]\)\@='

doc/vimwiki.txt

@@ -2954,7 +2954,7 @@ Where:
 List of (start, end) regex region delimiters to define the YAML header
 More information in #1287 and https://pandoc.org/MANUAL.html#extension-yaml_metadata_block
 
-Default: [['^---$', '^---$'], ['^\.\.\.$', '^\.\.\.$']]
+Default: [['^---$', '^\%(---\|\.\.\.$']]
 or similar with stricter anchors
 
 

test/issue_1287_yaml_header.vader

@@ -25,13 +25,13 @@ Given vimwiki (Yaml with --- at top):
 Execute (Assert delimiter with --- at top):
   call Issue1287Yaml(1)
 
-Given vimwiki (Yaml with ... at top):
-  ...
+Given vimwiki (Yaml with --- at bottom):
+  ---
   title: my title
   description: my description
   ...
 
-Execute (Assert delimiter with ... at top):
+Execute (Assert delimiter with ... at bottom):
   call Issue1287Yaml(1)
 
 Given vimwiki (Yaml with --- after empty line):
@@ -63,10 +63,7 @@ Execute (Assert all is yaml except after the closing ---):
 
   AssertEqual 'textSnipYAML1', GetSyntaxStack(1, 2)[0] . 1
   AssertEqual 'textSnipYAML2', GetSyntaxStack(2, 2)[0] . 2
-  AssertEqual 'textSnipYAML3', GetSyntaxStack(3, 2)[0] . 3
-  AssertEqual 'textSnipYAML4', GetSyntaxStack(4, 2)[0] . 4
-  AssertEqual 'textSnipYAML5', GetSyntaxStack(5, 2)[0] . 5
-  AssertEqual 'textSnipYAML6', GetSyntaxStack(5, 2)[0] . 6
+  AssertEqual 'VimwikiPre3', GetSyntaxStack(3, 2)[0] . 3
 
   AssertEqual 0, len(GetSyntaxStack(7, 2))
   AssertEqual 0, len(GetSyntaxStack(8, 2))