I'm trying to update message menu indicator and i want to import some geary funtions as well, does geary have any flags similar to Thunderbird (--compose)? I tried geary --? but didn't find any relevant info.
To launch the composer in Geary, specify a mailto: URI on the command-line:
It's not listed in the --help, unfortunately. That's ticketed at https://bugzilla.gnome.org/show_bug.cgi?id=722647
In short, it doesn't have, at least for now.
To see list of available commands, you can run
But as Official Website says
So there is possibility that this feature will be added in future releases. If you want to get more information, you should visit geary-list