lexical replacements #38

bot/bot.lua

@@ -48,6 +48,25 @@ function msg_valid(msg)
   end
 end
 
+function do_lex(msg, text)
+  local mutated = true
+  while mutated do
+    mutated = false
+    for name, desc in pairs(plugins) do
+      if (desc.lex ~= nil) then
+        result = desc.lex(msg, text)
+        if (result ~= nil) then
+          -- print ("Mutating to " .. result)
+          text = result
+          mutated = true
+        end
+      end
+    end
+  end
+  -- print("Text mutated to " .. text)
+  return text
+end
+
 -- Where magic happens
 function do_action(msg)
   local receiver = get_receiver(msg)
@@ -58,6 +77,9 @@ function do_action(msg)
      text = '['..msg.media.type..']'
   end
   -- print("Received msg", text)
+
+  text = do_lex(msg, text)
+
   for name, desc in pairs(plugins) do
     -- print("Trying module", name)
     for k, pattern in pairs(desc.patterns) do
@@ -67,9 +89,13 @@ function do_action(msg)
         print("  matches",pattern)
         if desc.run ~= nil then
           result = desc.run(msg, matches)
+          -- print("  sending", result)
           if (result) then
-            print("  sending", result)
+            local result2 = do_lex(msg, result)
-            _send_msg(receiver, result)
+            if (result2 == nil) then 
+              result2 = result
+            end
+            _send_msg(receiver, result2)
           end
         end
       end

plugins/get.lua

@@ -10,6 +10,17 @@ else
   _values = json:decode(c)
 end
 
+function fetch_value(chat, value_name)
+  if (_values[chat] == nil) then
+    return nil
+  end
+  if (value_name == nil ) then
+    return nil
+  end 
+  local value = _values[chat][value_name]
+  return value
+end
+
 function get_value(chat, value_name)
 
   -- If chat values is empty
@@ -40,11 +51,27 @@ function run(msg, matches)
    return get_value(chat_id, matches[1])
 end
 
+function lex(msg, text)
+  local chat_id = tostring(msg.to.id)
+  local s, e = text:find("%$%a+")
+  if (s == nil) then 
+    return nil
+  end
+  local var = text:sub(s + 1, e)
+  local value = fetch_value(chat_id, var)
+  if (value == nil) then
+    value = "(unknown value " .. var .. ")"
+  end
+  return text:sub(0, s - 1) .. value .. text:sub(e + 1)
+end
+
 return {
     description = "retrieves variables saved with !set", 
     usage = "!get (value_name)",
     patterns = {
       "^!get (%a+)$",
       "^!get$"}, 
-    run = run 
+    run = run,
+    lex = lex
 }
+