refactor: standardize help generation

plugins/proxy/help-functions

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
+
+cmd-proxy-help() {
+  declare desc="help command"
+  declare CMD="$1"
+  local plugin_name="proxy"
+  local plugin_description="Manage the proxy integration for an app"
+
+  if [[ "$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
+    proxy <app>, [DEPRECATED] Show proxy settings for app
+    proxy:disable <app>, Disable proxy for app
+    proxy:enable <app>, Enable proxy for app
+    proxy:ports <app>, List proxy port mappings for app
+    proxy:ports-add <app> [<scheme>:<host-port>:<container-port>...], Add proxy port mappings to an app
+    proxy:ports-clear <app>, Clear all proxy port mappings for an app
+    proxy:ports-remove <app> [<host-port>|<scheme>:<host-port>:<container-port>...], Remove specific proxy port mappings from an app
+    proxy:ports-set <app> [<scheme>:<host-port>:<container-port>...], Set proxy port mappings for an app
+    proxy:report [<app>] [<flag>], Displays a proxy report for one or more apps
+    proxy:set <app> <proxy-type>, Set proxy type for app
+help_content
+}