Initial test of plugins handler

bot/bot.lua

@@ -22,11 +22,6 @@ end
 function ok_cb(extra, success, result)
 end
 
--- Callback to remove tmp files
-function rmtmp_cb(file_path, success, result)
-   os.remove(file_path)
-end
-
 function msg_valid(msg)
   -- if msg.from.id == our_id then
   --   return true
@@ -170,15 +165,12 @@ function on_binlog_replay_end ()
   -- See plugins/ping.lua as an example for cron
 end
 
--- load all plugins in the plugins/ directory
+-- Enable plugins in config.json
 function load_plugins()
-  for k, v in pairs(scandir("plugins")) do
-    -- Load only lua files
-    if (v:match(".lua$")) then
-        print("Loading plugin", v)
-        t = loadfile("plugins/" .. v)()
-        table.insert(plugins, t)
-    end 
+  for k, v in pairs(config.enabled_plugins) do
+    print("Loading plugin", v)
+    t = loadfile("plugins/" .. v)()
+    table.insert(plugins, t)
   end
 end
 

bot/config.json

@@ -1,4 +1,5 @@
 {
+   "enabled_plugins": [ "plugins.lua", "echo.lua", "hello.lua" ],
        "rmtmp_delay": 20,
     "google_api_key": "",
           "log_file": "/var/www/html/log.txt",

bot/utils.lua

@@ -67,6 +67,11 @@ function download_to_file( url , noremove )
   return file_path
 end
 
+-- Callback to remove a file
+function rmtmp_cb(file_path, success, result)
+   os.remove(file_path)
+end
+
 function vardump(value, depth, key)
   local linePrefix = ""
   local spaces = ""
@@ -133,6 +138,7 @@ function is_sudo(msg)
    return var
 end
 
+-- Returns the name of the sender
 function get_name(msg)
    local name = msg.from.first_name
    if name == nil then
@@ -140,3 +146,26 @@ function get_name(msg)
    end
    return name
 end
+
+-- Returns at table of lua files inside plugins
+function plugins_names( )
+  local files = {}
+  for k, v in pairs(scandir("plugins")) do
+    -- Ends with .lua
+    if (v:match(".lua$")) then
+      table.insert(files, v)
+    end 
+  end
+  return files
+end
+
+-- Function name explains what it does.
+function file_exists(name)
+  local f = io.open(name,"r")
+  if f ~= nil then 
+    io.close(f) 
+    return true 
+  else 
+    return false 
+  end
+end

plugins/plugins.lua

@@ -0,0 +1,62 @@
+function enable_plugin( filename )
+	-- Checks if file exists
+	if file_exists('plugins/'..filename) then
+		-- Add to the config table
+		table.insert(config.enabled_plugins, filename)
+		-- Reload the plugins
+		reload_plugins( )
+	else
+		return 'Plugin does not exists'
+	end
+end
+
+function reload_plugins( )
+	plugins = {}
+	load_plugins()
+	return list_plugins(true)
+end
+
+function list_plugins(only_enabled)
+	local text = ''
+	for k, v in pairs( plugins_names( )) do
+		--  ✔ enabled, ❌ disabled
+		local status = '❌'
+		-- Check if is enabled
+		for k2, v2 in pairs(config.enabled_plugins) do
+			if v == v2 then 
+				status = '✔' 
+			end
+		end
+		if not only_enabled or status == '✔' then
+			text = text..v..' '..status..'\n'
+		end
+	end
+	return text
+end
+
+function run(msg, matches)
+	-- Show the available plugins 
+	if matches[1] == '!plugins' then
+		return list_plugins()
+	end
+	-- Reload all the plugins!
+	if matches[1] == 'reload' then
+		return reload_plugins(true)
+	end
+	-- Enable a plugin
+	if matches[1] == 'enable' then
+		print("enable: "..matches[2])
+		return enable_plugin(matches[2])
+	end
+end
+
+return {
+	description = "Enable / Disable plugins", 
+	usage = "!plugins",
+	patterns = {
+		"^!plugins$",
+		"^!plugins (enable) ([%w%.]+)$",
+		"^!plugins (reload)$"
+		}, 
+	run = run 
+}

plugins/reload.lua

@@ -1,14 +0,0 @@
-
-function run(msg, matches)
-  plugins = {}
-  load_plugins()
-  return 'Plugins reloaded'
-end
-
-return {
-    description = "Reloads bot plugins", 
-    usage = "!reload",
-    patterns = {"^!reload$"}, 
-    run = run 
-}
-