Fix syntax include errors with alias language

When alias names of a language are used with fenced code block,
syntax include is executed twice and causes errors.
We add `b:mkd_included_filetypes` to check syntax included.
Fix #251

diff --git a/ftplugin/markdown.vim b/ftplugin/markdown.vim
index d68e7c0a790aeeca9e1f55e574d05976bc363aaf..4019ff9f7dba69cb4ac77885d094cc2fec7ade78 100644 (file)
--- a/ftplugin/markdown.vim
+++ b/ftplugin/markdown.vim
@@ -631,6 +631,10 @@ function! s:MarkdownHighlightSources(force)
     if !exists('b:mkd_known_filetypes')
         let b:mkd_known_filetypes = {}
     endif
+    if !exists('b:mkd_included_filetypes')
+        " set syntax file name included
+        let b:mkd_included_filetypes = {}
+    endif
     if !a:force && (b:mkd_known_filetypes == filetypes || empty(filetypes))
         return
     endif
@@ -646,7 +650,12 @@ function! s:MarkdownHighlightSources(force)
                 let filetype = ft
             endif
             let group = 'mkdSnippet' . toupper(substitute(filetype, "[+-]", "_", "g"))
-            let include = s:SyntaxInclude(filetype)
+            if !has_key(b:mkd_included_filetypes, filetype)
+                let include = s:SyntaxInclude(filetype)
+                let b:mkd_included_filetypes[filetype] = 1
+            else
+                let include = '@' . toupper(filetype)
+            endif
             let command = 'syntax region %s matchgroup=%s start="^\s*```%s$" matchgroup=%s end="\s*```$" keepend contains=%s%s'
             execute printf(command, group, startgroup, ft, endgroup, include, has('conceal') ? ' concealends' : '')
             execute printf('syntax cluster mkdNonListItem add=%s', group)

diff --git a/test/syntax.vader b/test/syntax.vader
index e5618f353ba38a5b13ea01b8fb893f9ab0b62b4a..8ac0a2823047634b20e4d1d0b437ab5adeb655ed 100644 (file)
--- a/test/syntax.vader
+++ b/test/syntax.vader
@@ -375,6 +375,21 @@ Execute (fenced code block syntax with a language specifier):
   AssertEqual SyntaxOf('code'), 'mkdSnippetCPP'
   AssertEqual SyntaxOf('def'), 'rubyDefine'
 
+Given markdown;
+```vim
+let g:a = 1
+```
+
+```viml
+let g:b = 1
+```
+
+Execute (fenced code block syntax with alias language specifier):
+  let b:func = Markdown_GetFunc('vim-markdown/ftplugin/markdown.vim', 'MarkdownRefreshSyntax')
+  call b:func(0)
+  AssertEqual SyntaxOf('g:a'), 'vimVar'
+  AssertEqual SyntaxOf('g:b'), 'vimVar'
+
 Given markdown;
 ```a+b-
 code
@@ -385,7 +400,6 @@ Execute (fenced code block syntax with an unknown language specifier):
   call b:func(0)
   AssertEqual SyntaxOf('code'), 'mkdSnippetA_B_'
 
-
 Given markdown;
 ```
 =