[MlMt] Counter format syntax

[Benny Kjær Nielsen]

On 16 Jul 2022, at 14:44, David Wainberg wrote:

> One thing I want to fix is the format of the information behind a 
> counter dropdown. The documentation of the format syntax is pretty 
> sparse - https://manual.mailmate-app.com/format_string_syntax.html - 
> and I'm having trouble figuring it out.

Very understandable.

> Specifically, what I want to do at the moment is to shorten and fix 
> the length of the subject display, since by default it is variable, 
> and some email subjects are quite long. The size and positioning of 
> the dropdown adjusts accordingly, which I find undesirable.

That could be something like this (using regular expressions):

	${subject/(.{,10})(.+)?/$1(?2:…)/}

That looks pretty menacing, but it's the same syntax as provided by some 
text editors when doing search/replace. The MailMate syntax is identical 
to the one used by TextMate. That means the documentation found 
[here](https://macromates.com/manual/en/regular_expressions#conditional_insertions) 
is also useful for MailMate (and the example is more advanced than the 
one provided here).

To elaborate, this is the format string variant used above:

	${«var»/«regexp»/«format»/«options»}

The `var` is `subject`, but this could be any email header (or a subpart 
of a header).

The `regexp` is:

	(.{,10})(.+)?

It matches 10 characters and then the rest in 2 different capture 
variables.

The `format` used is then:

	$1(?2:…)

Which simply uses the (up to) 10 characters in the first capture and 
then adds the ellipsis if and only if the second capture contains 
anything.

> Even if that's not doable, I'd like to play with the format.
>
> I've searched the list and haven't found anything. Can anyone point me 
> to more docs or examples I can crib from?

The above isn't much, but maybe it'll help a bit.

-- 
Benny
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