milanglacier

# put the following under ~/.ctags.d/options.ctags, don't include this line into ~/.ctags.d/options.ctags

--langdef=Rext{base=R}
--kinddef-Rext=v,variable,a variable with named attr
--kinddef-Rext=n,nameattr,the named attributes of a variable
--_roledef-Rext.v=nondefinition,this is not a definition

--regex-Rext=/([[:alnum:]_.]+)\$[[:alnum:]_.]+\s*(<-|=)[^=]/\1/v/{scope=push}{_role=nondefinition}
--regex-Rext=/[[:alnum:]_.]+\$([[:alnum:]_.]+)\s*(<-|=)[^=]/\1/n/{scope=ref}
--regex-Rext=/[[:alnum:]_.]+\$[[:alnum:]_.]+\s*(<-|=)[^=].*///{scope=pop}{placeholder}