[Zope-dev] ANN: "Let" tag available for download

[Jim Fulton]

"Phillip J. Eby" wrote:
> 
> Do you find nesting <!--#with "_.namespace()"--> tags too verbose?  Don't
> like cluttering your REQUEST object with temporary variables?  Want to get
> at weirdly named DTML variables from Python expressions without having to
> play _[] and _.render() tricks?  Then check out:
> 
> http://telecommunity.com/DT_Let.py
> 
> It's a new tag that lets you create blocks like:
> 
> <!--#in "1,2,3,4"-->
> <!--#let num=sequence-item
>          index=sequence-index
>          result="num*index"-->
> <!--#var num--> * <!--#var index--> = <!--#var result-->
> <!--#/let-->
> <!--#/in-->
> 
> Which yields:
> 
> 1 * 0 = 0
> 2 * 1 = 2
> 3 * 2 = 6
> 4 * 3 = 12
> 
> Notice that quoted arguments are treated as expressions, and unquoted
> arguments are treated as DTML names.  Evaluation is in sequence with the
> result of earlier assignments available to later ones.  Later assignments
> can also override earlier ones, which can be helpful for longer
> step-by-step calculations.  The variables thus set are in effect for the
> life of the <!--#let--> block.
> 
> To use this wonderful, lifesaving tag, just stick the module somewhere that
> Python can find it, and put an "import DT_Let" somewhere in your code where
> it will get executed before you need it.  Permission is hereby granted to
> the wonderful folks at DC to incorporate this into Zope.  The point of
> making this was to reduce verbosity for heavy DTML scripting, though, so if
> you do put it in, *please*, *please* don't rename it to #with-namespace or
> #with-variable-values or anything like that, okay?  :)  Thanks.

I like it. May we include it in the Zope distribution?

Jim

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