Add experimental print setting action. The command is of the form:
print account_name listing.index_style
account_name is currently ignored.
The path, e.g. listing.index_style is split by "." and fed to
DotAddressable lookup trait method. The method checks the first segment
in the path if it matches any of the struct's fields, and then calls the
field's lookup method.
If a thread root is missing (i.e. we never received that message or it
was deleted) threads rendered like this:
├─>Re: original subject
├─>Re: original subject
└─>Re: original subject
This causes visual ambiguity if the parentless thread follows another:
Another thread
└─>Re: Another thread
├─>Re: original subject
├─>Re: original subject
└─>Re: original subject
This commit removes the "previous link" from every first message in a group:
┬─>Re: original subject
├─>Re: original subject
└─>Re: original subject
`mailer_command` was removed, and a new setting `send_mail` was added.
Its possible values are a string, consisting of a shell command to
execute, or settings to configure an smtp server connection. The
configuration I used for testing this is:
[composing]
send_mail = { hostname = "smtp.mail.tld", port = 587, auth = { type = "auto", username = "yoshi", password = { type = "command_eval", value = "gpg2 --no-tty -q -d ~/.passwords/msmtp/yoshi.gpg" } }, security = { type = "STARTTLS" } }
For local smtp server:
[composing]
send_mail = { hostname = "localhost", port = 25, auth = { type = "none" }, security = { type = "none" } }
config_macros.rs contains a macro that parses config structs and
generates a new "override" struct that contains the fields as Options.
The macro matches on each field's attributes and removes the serde
"default" attributes, since the override default is always None.
However, if an attribute contained a group of values and the first
wasn't `default` the attribute was skipped, so don't do that.
