go get bnbl.io/cdc to install. Next, simply create a configuration file at
$XDG_CONFIG_DIR/cdc/confg, which by default is
endpoint = "https://email@example.com/Default" username = "firstname.lastname@example.org" password-cmd = "pass email@example.com"
Search for contacts by running
cdc search-term. cdc writes results in a format
which is understood by aerc's and mutt's address book features. To configure
aerc to use cdc for completion, add the following to ~/.config/aerc/aerc.conf:
[compose] address-book-cmd=cdc '%s'
Patches may be set to ~firstname.lastname@example.org.