Description Philipp Hahn 2013-09-20 11:44:30 CEST

May template files use the easier @%@ UCR syntax to reference a UCR variable, which often breaks the syntax when the variable is unset.

Because of that the Python-variant using @!@ is used in many cases, because there unset variables can be handled better. This is a lot more complicated, error prone and also requires a fork of a Python process for each @!@ block (see bug #29484).

@%@ should be extended to allow some more output handling, e.g.
  @%@foo?bar@%@
    Print content of UCRV $foo or fallback to string literal 'bar'.
  @%@foo?n?True=y@%@
  @%@foo?n?False=y@%@
    Use is_true() and is_false() and either print 'y' or 'n'.

'?' and '=' are good candidates, since UCRV names can't contains those two characters.
Together with UCRV types (Bug #8768) this could be even improved further for list handling.