To some degree you can do that now with $editor and edit-message, right?

set my_editor=$editor
set editor="my-script %s"
<edit>
set editor="$my_editor"

my-script:
#!/bin/sh
sed -e 's/^X-Label: /' ...

However that's a workaround, and I see that this isn't really what
you're asking about.  Perhaps a good approach would be use a generic
filter_header function that can be easily hooked into any header or
message attribute editing function.

Just thinking in public about design -- I'm not proposing to do this
real soon now. :)

* On 12 Mar 2013, Vincent Lefevre wrote: 
> I'd like to be able to execute a script (this can be an option) for
> changing X-Label, e.g. if the string starts with the | character
> (or have a different function for that). The script could take the
> current X-Label value an input and output the new value.

-- 
David Champion • [email protected]

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