Create ssh module for envoy

modules/ssh-envoy/README.md

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+SSH Envoy
+=========
+
+Provides for an easier use of [SSH][1] by setting up [ssh-agent][2], using the [envoy][3] service for systemd.
+
+Settings
+--------
+
+### Identities
+
+To load multiple identities, add the following line to *zpreztorc*:
+
+    zstyle ':prezto:module:ssh-envoy:load' identities 'id_rsa' 'id_dsa' 'id_github'
+
+If new identities are added while the agent is running, they will be added on your next login/source.
+
+Authors
+-------
+
+*The authors of this module should be contacted via the [issue tracker][4].*
+
+  - [Sorin Ionescu](https://github.com/sorin-ionescu)
+  - [Viktor Jackson](https://github.com/xlator)
+
+[1]: http://www.openssh.com
+[2]: http://www.openbsd.org/cgi-bin/man.cgi?query=ssh-agent&sektion=1
+[3]: https://github.com/vodik/envoy
+[4]: https://github.com/sorin-ionescu/prezto/issues

modules/ssh-envoy/init.zsh

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+#
+# Provides for an easier use of SSH by setting up ssh-agent via envoy (https://github.com/vodik/envoy)
+#
+# Authors:
+#   Sorin Ionescu <sorin.ionescu@gmail.com>
+#   Viktor Jackson <viktor.jackson@gmail.com>
+#
+
+# Return if requirements are not found.
+if [[ "$OSTYPE" == darwin* ]] || (( ! $+commands[envoy] )); then
+  return 1
+fi
+
+# Load identities from config
+zstyle -a ':prezto:module:ssh-envoy:load' identities '_ssh_identities'
+
+# Check if envoyd is running
+if [[ `systemctl show envoy --property=ActiveState` != "ActiveState=active" ]]; then
+	
+	# Start envoy, add identities
+	if (( ${#_ssh_identities} > 0 )); then
+		/usr/bin/envoy -t ssh-agent ${^_ssh_identities[@]}
+	else
+		/usr/bin/envoy -t ssh-agent 
+	fi
+
+else
+	for _ssh_id in $_ssh_identities
+	do
+		# Check identities and add ones that aren't already added
+		envoy -l | grep "$HOME/.ssh/$_ssh_id" > /dev/null
+		if [[ $? != 0 ]]; then
+			echo "New identity: $_ssh_id"
+			envoy -a $_ssh_id
+		fi
+	done
+fi