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https://issues.apache.org/jira/browse/VELOCITY-619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636300#action_12636300
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Christoph Reck commented on VELOCITY-619:
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True that if someone used #set( $!foo = $bar ) in an earlier version it set the
value ignoring the bang. At some point it was discussed to use this syntax to
explicetely allow setting a NULL value. Changing this would break BC (even
though it is an unimplemented feature - some people may have local patches to
do so - as I had once...).
I propose to add a new directive for this, instead of overloading the #set with
bang to mean "set only if undefined".
Possible directive names: #default, #option, #setUndefined, #setIfUndefined,
#allow, #let
P.S. This is inline with some new directives introduced in Vel1.6: #evaluate,
#define($ref)...#end, and #break
> New set modifier so that set only assigns a value when variable is not
> defined.
> -------------------------------------------------------------------------------
>
> Key: VELOCITY-619
> URL: https://issues.apache.org/jira/browse/VELOCITY-619
> Project: Velocity
> Issue Type: Improvement
> Components: Engine
> Reporter: Byron Foster
> Attachments: setBangModifier_2.patch
>
>
> Define a new #set modifier such that a variable is only set if it is not
> defined, like so:
> #set($!foo = "bar")
> If the '!' character proceeds the variable foo, then $foo will be set with
> the value of "bar" ONLY IF $foo is not defined (is not in the context).
> Otherwise if $foo is defined it will remain unchanged.
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