feat: create tar:default alias for tar:help

plugins/tar/internal-functions

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+
+tar_help_content_func() {
+  declare desc="return tar plugin help content"
+  cat<<help_content
+    tar:in <app>, Reads an tarball containing the app from stdin
+    tar:from <app> <url>, Loads an app tarball from url
+help_content
+}
+
+tar_help_cmd() {
+  if [[ $1 = "tar:help" ]] ; then
+    echo -e 'Usage: dokku tar[:COMMAND]'
+    echo ''
+    echo 'An alternative to using git, apps are loaded via tarballs instead.'
+    echo ''
+    echo 'Additional commands:'
+    tar_help_content_func | sort | column -c2 -t -s,
+  elif [[ $(ps -o command= $PPID) == *"--all"* ]]; then
+    tar_help_content_func
+  else
+    cat<<help_desc
+    tar, Deploy applications via tarball instead of git
+help_desc
+  fi
+}