refactor: deprecate is_app_running in favor of ps#fn-ps-is-app-running

This will allow us to _actually_ introspect on the running state of an application. In certain cases, the detected state can be "mixed", meaning that we may need to take action, depending on what we want to do in mixed mode.

plugins/ps/functions

@@ -171,3 +171,34 @@ get_restart_policies() {
   local -r phase_file_path=$1
   get_raw_restart_policies "$phase_file_path" | sed -e 's/^--restart=//g'
 }
+
+fn-ps-app-status() {
+  declare APP="$1"
+  local PROCS=0 RUNNING=""
+  local APP_CIDS=$(get_app_container_ids "$APP");
+
+  for CID in $APP_CIDS; do
+    if (is_container_status "$CID" "Running"); then
+      RUNNING+="0"
+    else
+      RUNNING+="1"
+    fi
+    PROCS=$((PROCS + 1))
+  done
+
+  if [[ "${#RUNNING}" -eq 0 ]] || [[ "${#RUNNING}" -ne 0 ]] && [[ "$RUNNING" != *"0"* ]]; then
+    RUNNING="false"
+  elif [[ "$RUNNING" != *"1"* ]] && [[ "${#RUNNING}" -ne 0 ]]; then
+    RUNNING="true"
+  else
+    RUNNING="mixed"
+  fi
+
+  echo "$PROCS $RUNNING"
+}
+
+fn-ps-is-app-running() {
+  declare APP="$1"
+  APP_STATUS=$(fn-ps-app-status "$APP")
+  echo "$APP_STATUS" | cut -d ' ' -f 2
+}