Add the ability for services to require others

app/bin/screen_exists

@@ -1,3 +0,0 @@
-#!/usr/bin/env bash
-screen -ls "$1" >/dev/null 2>&1
-echo $?

app/bin/service_running

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+"$APP" onearg "$@"
+"$APP" exist "$1"
+source "$APP" service_env "$1"
+ps -u "$SERVICE_USER"
+if [ "$?" = "0" ]; then
+	exit 0
+fi
+exit 1

app/bin/start

@@ -3,18 +3,24 @@
 "$APP" exist "$1"
 source "$APP" service_env "$1"
 
+for SERVICE in "${SERVICE_REQUIRE:@}"; do
+	"$APP" start "$SERVICE"
+done
+
 echo "[$APP_NAME] Starting '$1' ..."
 if [ "$SERVICE_RUN" = "" ]; then
 	exit 0
 fi
 
-set +e
+if "$APP" service_running "$1"; then
-ps -u "$SERVICE_USER"
-if [ "$?" = "0" ]; then
 	echo "Service is already running."
 	exit 0
 fi
-set -e
+
+if [ -e "$APP_SERVICES/$1/start" ]; then
+	source "$APP_SERVICES/$1/start"
+fi
+
 SERVICE_RUN_RAW="cd \"$SERVICE_CD\"; exec ${SERVICE_RUN//"/\\"}"
 if [ "$SERVICE_SCREEN" = "1" ]; then
 	screen -dmS "$SERVICE_SCREEN_NAME" gosu "$SERVICE_USER" bash -c "$SERVICE_RUN_RAW"
@@ -22,3 +28,6 @@ else
 	gosu "$SERVICE_USER" nohup bash -c "$SERVICE_RUN_RAW" > /dev/null 2>&1 &
 fi
 
+if [ -e "$APP_SERVICES/$1/await" ]; then
+	source "$APP_SERVICES/$1/await"
+fi

app/bin/stop

@@ -7,13 +7,16 @@ source "$APP" service_env "$1"
 if [ "$SERVICE_STOP" = "0" ]; then
 	exit 0
 fi
-set +e
+
-ps -u "$SERVICE_USER"
+if ! "$APP" service_running "$1"; then
-if ! [ "$?" = "0" ]; then
 	echo "Service already stopped."
 	exit 0
 fi
 
+if [ -e "$APP_SERVICES/$1/stop" ]; then
+	source "$APP_SERVICES/$1/stop"
+fi
+
 if [ "$SERVICE_SCREEN" = "1" ] && ! [ "$SERVICE_SCREEN_EXIT_COMMAND" = "" ]; then
 	echo "[$APP_NAME] * Sending backspaces to screen ..."
 	if [ "$SERVICE_SCREEN_EXIT_BACKSPACE" = "1" ]; then

services/hello_world/settings

@@ -1,4 +1,6 @@
 #!/bin/sh
+# If defined, the service will wait for other services to be started
+SERVICE_REQUIRE=()
 # If command is defined, it will create and run a service unit
 SERVICE_RUN='./hello'
 # Working directory