refactor: standardize help generation

plugins/nginx-vhosts/help-functions

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
+
+cmd-nginx-vhosts-help() {
+  declare desc="help command"
+  declare CMD="$1"
+  local plugin_name="nginx"
+  local plugin_description="Manage the nginx proxy"
+
+  if [[ "$CMD" == "$plugin_name:help" ]]; then
+    echo -e "Usage: dokku $plugin_name[:COMMAND]"
+    echo ''
+    echo "$plugin_description"
+    echo ''
+    echo 'Additional commands:'
+    fn-help-content | sort | column -c2 -t -s,
+  elif [[ $(ps -o command= $PPID) == *"--all"* ]]; then
+    fn-help-content
+  else
+    cat <<help_desc
+    $plugin_name, $plugin_description
+help_desc
+  fi
+}
+
+fn-help-content() {
+  declare desc="return help content"
+  cat <<help_content
+    nginx:access-logs <app> [-t], Show the nginx access logs for an application (-t follows)
+    nginx:build-config <app>, (Re)builds nginx config for given app
+    nginx:error-logs <app> [-t], Show the nginx error logs for an application (-t follows)
+    nginx:report [<app>] [<flag>], Displays an nginx report for one or more apps
+    nginx:set <app> <property> (<value>), Set or clear an nginx property for an app
+    nginx:show-conf <app>, Display app nginx config
+    nginx:validate [<app>] [--clean], Validates and optionally cleans up invalid nginx configurations
+help_content
+}