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Re: [Nmh-workers] Dealing with missing From: header during send.

From: Earl Hood
Subject: Re: [Nmh-workers] Dealing with missing From: header during send.
Date: Tue, 10 Jan 2012 15:09:29 -0600

On Tue, Jan 10, 2012 at 2:19 PM, Ken Hornstein <address@hidden> wrote:
> Ow.  Damn your eyes, Earl ... I now have a headache from staring at the
> damn mh-format code.

I'm glad you decided to look at the code since I was not
looking forward to it myself.

> But, on the upside ... I figured out the issue here.
> The problem is not technically with accessing the same component
> again.  It's actually accessing the same _ADDRESS_ again via
> %(formataddr).  Let me explain.
> There is a cache inside of replsbr.c of addresses that were seem by
> the %(formataddr) function; if you try to insert the same email address
> twice, it will silently stop you from doing so.  This is obviously to
> prevent duplicate email addresses from appearing in To: and cc: lines.
> So what is happening to you is when you try to use the "to" component
> again to make the decision to construct your From: line, it doesn't
> get addded to the list because formataddr considers it a duplicate.

I would assume that if I use %(lit) to clear the str buffer, it
should clear the cache.

> So, possible solutions?
> - Have %(putaddr) clear out the address cache via a callback to replsbr.c.
>  This is a behavior change, and could result in duplicate addresses
>  appearing in a cc: line (for example).

I do not like this.  I would think %(lit) should clear the cache
since it empty the str register.

> - Create a new mh-format function (perhaps %(clearaddr) ?) that explicitly
>  clears out the address cache.

This may be acceptable.  I'm not sure if there are components files
that depending on the caching, even after %(lit) is used.

> The first one is easy, but might have unintended consequences.


> The second
> is more complicated, but not terrible and is arguably more correct.  Thoughts?

My question is: If the str buffer is zeroed, or set, via %(lit), should
the cache be automatically cleared?


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