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https://issues.apache.org/jira/browse/VELOCITY-619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636464#action_12636464
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Nathan Bubna commented on VELOCITY-619:
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Not being able to use #if like that in strict mode might confuse people too. I
actually didn't fully realize/notice that the patch for VELOCITY-618 would make
#if( $foo ) throw an error in strict mode. i use #if to check if a variable is
present as often as i use it to check if a variable is true or false.
My preference would be to allow #if( $foo ) even in strict mode. Then this
behaviour is possible without introducing any backwards compatibility concerns.
We can re-examine this if/when someone gets a 2.0 version started. Then
backwards compatibility is not much of a concern.
> New set modifier so that set only assigns a value when variable is not
> defined.
> -------------------------------------------------------------------------------
>
> Key: VELOCITY-619
> URL: https://issues.apache.org/jira/browse/VELOCITY-619
> Project: Velocity
> Issue Type: Improvement
> Components: Engine
> Reporter: Byron Foster
> Attachments: setBangModifier_2.patch
>
>
> Define a new #set modifier such that a variable is only set if it is not
> defined, like so:
> #set($!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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