[PATCH cygport] Add customization support for announce command

[Jon Turney]

On 10/03/2024 16:33, Christian Franke via Cygwin-apps wrote:
> Jon Turney wrote:
>> On 23/02/2024 11:23, Christian Franke via Cygwin-apps wrote:
>>> Christian Franke wrote:
>>>> The email generated by the cygport announce command is useful, but 
>>>> actual use cases are somewhat limited due to the hard-coded email 
>>>> submission.
>>>>
>>>> The attached patch adds more flexibility. The patch is on top of the 
>>>> "Use correct wording if only one package is announced" patch.
>>>
>>> Slightly changed patch attached. Also adjusted to new version of "Use 
>>> correct wording if only one package is announced" patch.
>>>
>>>
>> [...]
>>
>> Thanks for this.
>>
>>> Possible (better?) alternative names for the new settings:
>>> ANNOUNCEMENT_EDITOR
>>> ANNOUNCEMENT_MAILER
>>
>> Hmmm... I think "ANNOUNCE_EDITOR" and "ANNOUNCE_MAILER" would be
>> the best for clarity and conciseness.
> 
> New patch attached. Is still on top of "Use correct wording ..." patch.
> 
> I also added HOMEPAGE to the propagated variables as this should be 
> included in an announcement.

Thanks.

> +	/bin/bash -c "cd ${top} || exit 1
> +${HOMEPAGE+HOMEPAGE=${HOMEPAGE@Q}}
> +P=${P@Q}; PF=${PF@Q}; PN=${PN@Q}; PR=${PR@Q}; PV=(${PV[*]@Q})
> +${SMTP_SENDER+SMTP_SENDER=${SMTP_SENDER@Q}}
> +${SMTP_SERVER+SMTP_SERVER=${SMTP_SERVER@Q}}
> +${SMTP_SERVER_PORT+SMTP_SERVER_PORT=${SMTP_SERVER_PORT@Q}}
> +${SMTP_ENCRYPTION+SMTP_ENCRYPTION=${SMTP_ENCRYPTION@Q}}
> +${SMTP_USER+SMTP_USER=${SMTP_USER@Q}}
> +${SMTP_PASS+SMTP_PASS=${SMTP_PASS@Q}}
> +${cmd}
> +" 		$0 ${msg} || error "Command '\${${cmdvar}} ${msg}' (cwd=${top}) failed"
> +}

Sorry I didn't notice this before, and I am terrible at writing shell, 
but perhaps you could share the reasoning behind writing this as above, 
and not as, e.g.

(cd ${top} && env BLAH ${cmd})

avoiding all the verbiage in the description of ANNOUNCE_EDITOR about it 
being fed into 'bash -c' (and hence getting evaluated twice??) rather 
than just run?