Add checklist syntax

vim/after/syntax/checklist.vim

@@ -0,0 +1,29 @@
+if exists("b:current_syntax")
+    finish
+endif
+
+let b:current_syntax="checklist"
+
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+syn region ckSuccess start="^ [+] " end="\(\(^$\)\|\(^ [+*-@]\)\)\@="
+syn region ckFailure start="^ [-] " end="\(\(^$\)\|\(^ [+*-@]\)\)\@="
+syn region ckComment start="^ [@] " end="\(\(^$\)\|\(^ [+*-@]\)\)\@="
+syn region ckEvent   start="\(^ [*] \)" end="\(\(^$\)\|\(^ [+*-@]\)\)\@="
+
+syn region ckTitle start="\(Checklist:\)\@<=" end="\(^$\)\@="
+
+syn region ckDate start="^202" end="[0-9][:]$"
+
+syn keyword ckSummary Positive Negative Conclusion
+
+hi def link ckNegative Error
+hi def link ckComment Comment
+hi def link ckDate Constant
+hi def link ckEvent Delimiter
+hi def link ckSummary Function
+hi def link ckSuccess Type
+hi def link ckFailure Object
+hi def link ckTitle Keyword