Combined logging

Closes #8

abra

@@ -7,10 +7,6 @@ PROGRAM_NAME=$(basename "$0")
 yml_pattern_exists() {
 	PATTERN=$1
 
-	if ! type yq > /dev/null 2>&1; then
-		error "yq program is not installed"
-	fi
-
 	if [ -f "$ABRA_CONFIG" ]; then
 			RESULT=$(yq read "$ABRA_CONFIG" "$PATTERN")
 
@@ -82,6 +78,8 @@ fi
 ###### Load config
 
 if [ -f "$ABRA_CONFIG" ]; then
+	require_yq
+
 	if yml_pattern_exists stack_name; then
 		STACK_NAME=$(yq read "$ABRA_CONFIG" stack_name)
 	fi
@@ -114,6 +112,18 @@ load_context() {
 
 ###### Safety checks
 
+require_yq() {
+	if ! type yq > /dev/null 2>&1; then
+		error "yq program is not installed"
+	fi
+}
+
+require_multitail() {
+	if ! type multitail > /dev/null 2>&1; then
+		error "multitail program is not installed"
+	fi
+}
+
 require_stack() {
 	if [ -z "$STACK_NAME" ]; then
 		error "no stack_name, export \$STACK_NAME=my_cool_app or add it to abra.yml"
@@ -147,6 +157,7 @@ sub_help() {
 	echo "    cp SRC_PATH SERVICE:DEST_PATH         copy files to a container"
 	echo "    deploy                                let 'em rip"
 	echo "    logs SERVICE [ARGS]                   tail logs from a deployed service"
+	echo "    multilogs                             tail logs from a whole stackk"
 	echo "    run SERVICE CMD                       run a command in the specified service's container"
 	echo "    run_args SERVICE ARGS CMD             run, passing extra args to docker exec"
 	echo "    secret [--help] [SUBCOMMAND]          manage secrets"
@@ -283,11 +294,33 @@ sub_deploy (){
 
 ###### Subcommand `logs`
 
+sub_multilogs() {
+	require_stack
+	require_multitail
+
+	# Get a list of the service names
+	SERVICES=$(docker stack services --format "{{.Name}}" "${STACK_NAME}")
+	# Sort the service names
+	SERVICES=$(echo "${SERVICES}" | sort)
+	# Create the command to run
+	COMMAND='multitail --mergeall'
+	for SERVICE in ${SERVICES}; do
+			COMMAND="${COMMAND} -L 'docker service logs --tail 20 -f ${SERVICE}'"
+	done
+	# Run the command
+	bash -c "${COMMAND}"
+}
+
 sub_logs (){
 	require_stack
 
 	SERVICE=$1
 
+	if [ -z "$SERVICE" ]; then
+		warning "No \$SERVICE provided, running multilogs"
+		sub_multilogs
+	fi
+
 	shift
 
 	if [ $# -eq 0 ]; then