client: completion.bash: set xtrace if debug enabled

client/src/docker/completion.bash

@@ -17,6 +17,14 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <https://www.gnu.org/licenses/>.
 
+# WARNING: because of completion, the docker-finance environment file
+# is never read. Ergo, for debugging, you'll need to run the following:
+#
+#   `export DOCKER_FINANCE_DEBUG=true && . ~/.bashrc`
+#
+# and then proceed to call `docker-finance` / `dfi` with your commands.
+[ "$DOCKER_FINANCE_DEBUG" == true ] && set -xv
+
 # If not yet installed, gracefully exit
 if ! hash docker &>/dev/null; then
   exit 0