Collapse help into expandable command topics

plugins/ps/commands

@@ -4,7 +4,9 @@ set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 
 case "$1" in
   help | ps:help)
-    cat<<EOF
+    help_content_func () {
+      declare desc="return help_content string"
+      cat<<help_content
     ps <app>, List processes running in app container(s)
     ps:scale [<app> <proc>=<count> [<proc>=<count>]], Get/Set how many instances of a given process to run
     ps:start <app>, Start app container(s)
@@ -14,7 +16,19 @@ case "$1" in
     ps:restart <app>, Restart app container(s)
     ps:restartall, Restart all deployed app containers
     ps:restore, Start previously running apps e.g. after reboot
-EOF
+help_content
+    }
+
+    if [[ $1 = "ps:help" ]] ; then
+        echo -e 'Usage: dokku ps[:COMMAND]'
+        echo ''
+        echo 'List running processes in container, and restart app.'
+        echo ''
+        echo 'Additional commands:'
+        help_content_func | sort | column -c2 -t -s,
+    else
+        help_content_func
+    fi
     ;;
 
   *)