Add `abra cp` command to push & pull files

abra

@@ -52,11 +52,12 @@ sub_help() {
 	echo "Usage: $PROGRAM_NAME [-a STACK_NAME] <subcommand> [options]"
 	echo ""
 	echo "Subcommands:"
+	echo "    cp SRC_PATH SERVICE:DEST_PATH         copy files to a container"
+	echo "    deploy [COMPOSE_FILE]                 let 'em rip"
+	echo "    logs SERVICE [ARGS]                   tail logs from a deployed service"
 	echo "    run SERVICE CMD                       run a command in the specified service's container"
 	echo "    run_args SERVICE ARGS CMD             run, passing extra args to docker exec"
 	echo "    secret_generate SECRET VERSION [CMD]  generate a secret, store it in pass & as a Docker secret"
-	echo "    deploy [COMPOSE_FILE]                 let 'em rip"
-	echo "    logs SERVICE [ARGS]                   tail logs from a deployed service"
 	echo "    ... (custom commands)"
 	echo ""
 	echo "Make sure \$STACK_NAME is set using direnv or -a"
@@ -159,6 +160,35 @@ sub_logs (){
 	docker service logs "${STACK_NAME}_${SERVICE}" $LOGS_ARGS
 }
 
+sub_cp() {
+	SOURCE=$1
+	DEST=$2
+
+	SERVICE=$(echo "$SOURCE" | grep -o '^[^:]\+:' || echo "$DEST" | grep -o '^[^:]\+:')
+	SERVICE=$(echo $SERVICE | tr -d ':')
+
+	if [ -z $SERVICE ]; then
+		echo "$(tput setaf 1)ERROR: Can't find SERVICE in either SRC or DEST$(tput sgr0)"
+		echo ""
+		echo "Usage: $PROGRAM_NAME cp SERVICE:SRC_PATH DEST_PATH"
+		echo "       $PROGRAM_NAME cp SRC_PATH SERVICE:DEST_PATH"
+		exit
+	fi
+
+	CONTAINER=$(docker container ls --format "table {{.ID}},{{.Names}}" \
+		| grep "${STACK_NAME}_${SERVICE}" | cut -d',' -f1)
+
+	if [ -z $CONTAINER ]; then
+		echo "$(tput setaf 1)ERROR: Can't find a ${STACK_NAME}_${SERVICE}$(tput sgr0)"
+		exit
+	fi
+
+	CP_ARGS=$(echo "$SOURCE $DEST" | sed "s/$SERVICE/$CONTAINER/")
+
+	# shellcheck disable=SC2086
+	docker cp $CP_ARGS
+}
+
 subcommand=$1
 case $subcommand in
 	"" | "-h" | "--help")