[GNC] Support message:// for transaction associations

[Jim DeLaHunt]

Derek:

>> On MacOS it is possible to get a URL that takes you to a mail 
>> message(in mail.app). The URL is of the form 
>> <message://<3745692383.13655895.1603345168343@email.apple.com> 
> First, the more cross-platform uri would be mailto:

It looks to me like the message: prefix does something different than 
the mailto: prefix.

Derek, I suspect you are alluding to the mailto: prefix being followed 
by an email address. Clicking that link causes the app to (possibly 
transfer to an email app, and) create a UI for composing a new message 
to that email address. Other decoration can pre-fill the Subject line.

It seems to me that Ira is alluding to the message: prefix being 
followed by an identifier of an email message. Perhaps it is the 
Message-ID value, which can be formatted similarly to an email address, 
but is not one. Clicking that link causes the app to (possibly transfer 
to an email app, and) open that message for reading.  It does not seem 
to compose a new message.

I may be wrong, but it seems you two might be talking past each other a bit.

Hope this helps with communication,
       —Jim DeLaHunt

On 2021-01-02 06:15, Derek Atkins wrote:
> Hi.
> First, the more cross-platform uri would be mailto:
> Second, the issue is that gnucash catches all uris internally so there 
> are no external bindings.
>
> -derek
> Sent using my mobile device. Please excuse any typos.
> On January 2, 2021 9:42:48 AM Ira Fuchs <irafuchs at gmail.com> wrote:
>
>> I am running Gnucash for under MacOS mojave. On MacOS it is possible 
>> to get a URL that takes you to a mail message(in mail.app). The URL 
>> is of the form 
>> <message://<3745692383.13655895.1603345168343@email.apple.com> 
>> <message://%3C3745692383.13655895.1603345168343@email.apple.com%3E>. 
>> If I enter this URL as the location for an association and then try 
>> to go to it in gnucash, I get the error message that the file cannot 
>> be found. (If the URL is pasted into Safari, it opens the email 
>> message directly). It would be very helpful if Gnucash associations 
>> could point to email invoices directly.
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