No autoindent in code block

Fix #78

indent/markdown.vim

@@ -18,6 +18,10 @@ setlocal comments+=b:>
 " Only define the function once
 if exists("*GetMarkdownIndent") | finish | endif
 
+function! s:is_mkdCode(lnum)
+    return synIDattr(synID(a:lnum, 1, 0), 'name') == 'mkdCode'
+endfunction
+
 function! s:is_li_start(line)
     return a:line !~ '^ *\([*-]\)\%( *\1\)\{2}\%( \|\1\)*$' &&
       \    a:line =~ '^\s*[*+-] \+'
@@ -48,8 +52,12 @@ function GetMarkdownIndent()
         " Current line is the first line of a list item, do not change indent
         return indent(v:lnum)
     elseif s:is_li_start(line)
-        " Last line is the first line of a list item, increase indent
-        return ind + list_ind
+        if s:is_mkdCode(lnum)
+            return ind
+        else
+            " Last line is the first line of a list item, increase indent
+            return ind + list_ind
+        end
     else
         return ind
     endif

test/indent.vader

@@ -1,7 +1,7 @@
 Given markdown;
 * item1
 
-Do (Insert enter at list end):
+Do (insert enter at list end):
   A\<Enter>item2
 
 Expect (auto insert * and indent level is same):
@@ -13,7 +13,7 @@ Given markdown;
 Execute:
   syntax off
 
-Do (Insert enter at list end with syntax off):
+Do (insert enter at list end with syntax off):
   i* item1\<Enter>item2
 
 Expect (auto insert * and indent level is same):
@@ -22,3 +22,15 @@ Expect (auto insert * and indent level is same):
 
 Execute:
   syntax on
+
+Given markdown;
+```
+* item1
+
+Do (insert after list items in code block):
+  jotext
+
+Expect (no autoindent in code block):
+  ```
+  * item1
+  text