Updated vim todo chars

vim/after/syntax/markdown.vim

@@ -1,16 +1,16 @@
 " Vim syntax file
 " Add checkboxes to *.md files
 " source: https://gist.github.com/huytd/668fc018b019fbc49fa1c09101363397
+" source: https://gist.github.com/huytd/668fc018b019fbc49fa1c09101363397?permalink_comment_id=3632149#gistcomment-3632149
 
 " Custom conceal
 let dtd_ignore_case=0
-syntax match todoCheckbox /\[\ \]/ conceal cchar=☐
-syntax match todoCheckbox /\C\[X\]/ conceal cchar=☒
-syntax match todoCheckbox /\C\[x\]/ conceal cchar=☑
 
-syntax match todoCheckbox /[*-] \[\ \]/ conceal cchar=☐
+syntax match todoCheckbox '\v(\s+)?(-|\*)\s\[\s\]'hs=e-4 conceal cchar=☐
-syntax match todoCheckbox /\C[*-] \[X\]/ conceal cchar=☒
+syntax match todoCheckbox '\v(\s+)?(-|\*)\s\[x\]'hs=e-4 conceal cchar=☑
-syntax match todoCheckbox /\C[*-] \[x\]/ conceal cchar=☑
+syntax match todoCheckbox '\v(\s+)?(-|\*)\s\[-\]'hs=e-4 conceal cchar=☒
+syntax match todoCheckbox '\v(\s+)?(-|\*)\s\[\.\]'hs=e-4 conceal cchar=⊡
+syntax match todoCheckbox '\v(\s+)?(-|\*)\s\[o\]'hs=e-4 conceal cchar=⬕
 
 hi def link todoCheckbox Todo