Option for automatic detection of nested syntaxes

doc/vimwiki.txt

@@ -1940,6 +1940,20 @@ or in: >
  }}}
 
 
+*vimwiki-option-automatic_nested_syntaxes*
+------------------------------------------------------------------------------
+Key                       Default value~
+automatic_nested_syntaxes 1            
+
+Description~
+Allows for smaller |vimwiki-option-nested_syntaxes| dictionaries, by turning
+entry for python on the previous example unnecessary: >
+  let wiki.nested_syntaxes = {'python': 'python', 'c++': 'cpp'}
+
+It requires that the file is reloaded (|:edit|) after new |filetype| is
+included in a file.
+
+
 *vimwiki-option-diary_rel_path*
 ------------------------------------------------------------------------------
 Key             Default value~

plugin/vimwiki.vim

@@ -390,6 +390,7 @@ let s:vimwiki_defaults.template_default = ''
 let s:vimwiki_defaults.template_ext = ''
 
 let s:vimwiki_defaults.nested_syntaxes = {}
+let s:vimwiki_defaults.automatic_nested_syntaxes = 1
 let s:vimwiki_defaults.auto_export = 0
 let s:vimwiki_defaults.auto_toc = 0
 " is wiki temporary -- was added to g:vimwiki_list by opening arbitrary wiki

syntax/vimwiki.vim

@@ -600,7 +600,10 @@ call vimwiki#u#reload_regexes_custom()
 let b:current_syntax="vimwiki"
 
 " EMBEDDED syntax setup "{{{
-let s:nested = extend(VimwikiGet('nested_syntaxes'), vimwiki#base#detect_nested_syntax())
+let s:nested = VimwikiGet('nested_syntaxes')
+if VimwikiGet('automatic_nested_syntaxes')
+  let s:nested = extend(s:nested, vimwiki#base#detect_nested_syntax())
+endif
 if !empty(s:nested)
   for [s:hl_syntax, s:vim_syntax] in items(s:nested)
     call vimwiki#base#nested_syntax(s:vim_syntax,