[Rpm-maint] [rpm-software-management/rpm] Triple operator for conditional shortcut (#115)

[pavlinamv]

I do not see any possibility how to define sensible syntax of the triple operator, without possible causing problems for macros %{?condition:true} and %{!?condition:false}. Thus I think that adding this macro without additional changes is not a good idea.

The syntax of the macro should start "%{?condition:" or "%{!?condition:"
But then there is a problem with next separator operator:
  E.g if we define syntax
       %{?condition:true!false},
  where separator operator is the first '!' after ':', which is not nested in {} or in ()
  it will change interpretation of macros like
       %{?write_errors: You did not respond! It is a mistake.}
  which will change from its original meaning 
  if "write_errors" is defined, then write "You did not respond! It is a mistake."
  to 
  if "write_errors" is defined, then write "You did not respond" else write " It is a mistake."
 
If we change separator operator from "!" to another character it will not help us a lot. The mentioned type of mistake will still occur. The only characters which are different from rpm point of view are  "{", "}", "(", ")". To use some of them is not a good choice too. The triple operator will look very weird and probably another type of problems occur.

Similarly for a separator operator defined as a sequence of chars.

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