I guess the following is a better solution?
Inside a tag, the parameters variable contains a hash of Proc, one for
each parameter (tag)
parameters = [:a => Proc(a), :b => Proc(b), ...]
<panel>
<a>hello</a>
<b>blip</b>
</panel>
<def tag="panel" ...>
<%
checklist = []
<a: param>
checklist << :a
%>
<%= comma?(params, checklist) %>
<% checklist << :b %>
<b: param>
<%= comma?(params, checklist) %>
<% checklist << :c %>
<c: param>
%>
util.rb
-------
def comma?(params, checklist)
"," if any_content?(params, checklist)
end
def any_content?(params, checklist)
checklist.each do |sym|
return true unless params[:checklist].call.blank?
ënd
false
end
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