Reworks plugin loading and structure

Implements #4358

scripts/plugins/examples/example/status_definitions/status_example.lua

@@ -0,0 +1,47 @@
+--
+-- (C) 2019-20 - ntop.org
+--
+
+local status_keys = require "flow_keys"
+
+local alert_consts = require("alert_consts")
+
+-- This file defines a new flow status, with key "status_example" (the file name).
+-- A flows status can set/unset by the user scripts located into the "user_scripts"
+-- directory of the plugin.
+
+-- #################################################################
+
+-- @brief This function is called each time this status should be formatted
+-- @param flowstatus_info: the data passed in flow.triggerStatus by
+-- the triggering user_script (user_scripts/flow/example.lua in this plugin).
+-- @return a descriptive string of the flow status
+local function formatExampleStatus(flowstatus_info)
+  local bad_port = flowstatus_info.bad_port
+
+  return i18n("example.status_invalid_port", {port_number = bad_port})
+end
+
+-- #################################################################
+
+return {
+  status_key = status_keys.ntopng.status_example,
+  -- alert_type: the alert type associated to this status
+  -- alert_severity: the alert severity associated to this status
+  -- i18n_title: a localization string for the status
+  -- i18n_description (optional): a localization string / function for the description
+
+  -- A label to associate to this status
+  i18n_title = "example.status_title",
+
+  -- A descriptive message of the status. Can be either a simple localized string
+  -- e.g. "example.simple_status" or, as in this case, a formatter function.
+  i18n_description = formatExampleStatus,
+
+  -- The severity of the alert triggered based on this status
+  alert_severity = alert_consts.alert_severities.error,
+
+  -- The alert associated to this status. "alert_example" here corresponds
+  -- to the alert key of example/alert_definitions/alert_example.lua
+  alert_type = alert_consts.alert_types.alert_example,
+}