Collapse help into expandable command topics

plugins/apps/commands

@@ -4,12 +4,33 @@ set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 
 case "$1" in
   help | apps:help)
-    cat<<EOF
+    help_content_func () {
+      declare desc="return help_content string"
+      cat<<help_content
     apps, List your apps
     apps:create <app>, Create a new app
     apps:destroy <app>, Permanently destroy an app
     apps:rename <old-app> <new-app>, Rename an app
-EOF
+help_content
+    }
+
+    if [[ $1 = "apps:help" ]] ; then
+        echo -e 'Usage: dokku apps[:COMMAND]'
+        echo ''
+        echo 'List your apps.'
+        echo ''
+        echo 'Example:'
+        echo ''
+        echo '$ dokku apps'
+        echo '=====> My Apps'
+        echo 'example'
+        echo 'example2'
+        echo ''
+        echo 'Additional commands:'
+        help_content_func | sort | column -c2 -t -s,
+    else
+        help_content_func
+    fi
     ;;
 
   *)