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<== Date ==> <== Thread ==>
Subject: RE: Trouble with macro substitutions
From: "Leblanc, Gregory via Tech-talk" <tech-talk at aps.anl.gov>
To: "Johnson, Andrew N." <anj at anl.gov>
Cc: EPICS tech-talk <tech-talk at aps.anl.gov>
Date: Tue, 24 Aug 2021 16:54:24 +0000

Thanks, that’s got the macro problem straightened out.  Not sure how any of this was really intended to work, yet. 

    Greg

 

From: Johnson, Andrew N. <anj at anl.gov>
Sent: Monday, August 23, 2021 1:05 PM
To: Johnson, Andrew N. <anj at anl.gov>
Cc: Leblanc, Gregory <leblanc at ohio.edu>; EPICS tech-talk <tech-talk at aps.anl.gov>
Subject: Re: Trouble with macro substitutions

 

On Aug 23, 2021, at 11:43 AM, Johnson, Andrew N. via Tech-talk <tech-talk at aps.anl.gov> wrote:

 

Well the obvious explanation is that the empty value intended for your $(s) macro in the substitutions file is being ignored — you have actually found a bug in our msi tool.

 

Actually looking at the code both msi and the dbLoadTemplates() iocsh command ignore an empty pattern value, so I’m not sure that this is actually a bug, it looks to be be how the code was originally intended to work, so the fix would be to use empty quotes for any empty macro values as I suggested before, either single or double quotes should work:



If it were setting $(s) to an empty string the PV name should begin with a colon character ‘:’ in the expanded version but it doesn’t — is that what you want to happen? For a workaround if you want $(s) to be empty you can do that by using an empty pair of double-quotes instead, I have just tried that and it works.

 

- Andrew

 

-- 

Complexity comes for free, simplicity you have to work for.

 

References:
Trouble with macro substitutions Leblanc, Gregory via Tech-talk
Re: Trouble with macro substitutions Johnson, Andrew N. via Tech-talk
Re: Trouble with macro substitutions Johnson, Andrew N. via Tech-talk
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