From d40346b4810e20ad2af849dff938f9904822bdd9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Mun=CC=83oz?= <dmunoz@agnitio-corp.com>
Date: Fri, 26 Dec 2014 12:13:27 +0100
Subject: [PATCH] lexical replacements

---
 bot/bot.lua     | 32 +++++++++++++++++++++++++++++---
 plugins/get.lua | 29 ++++++++++++++++++++++++++++-
 2 files changed, 57 insertions(+), 4 deletions(-)

diff --git a/bot/bot.lua b/bot/bot.lua
index 70f5d8b..0e1e19d 100644
--- a/bot/bot.lua
+++ b/bot/bot.lua
@@ -42,6 +42,25 @@ 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)
@@ -52,18 +71,25 @@ 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
       -- print("Trying", text, "against", pattern)
       matches = { string.match(text, pattern) }
       if matches[1] then
-        print("  matches",pattern)
+        -- print("  matches",pattern)
         if desc.run ~= nil then
           result = desc.run(msg, matches)
-          print("  sending", result)
+          -- print("  sending", result)
           if (result) then
-            _send_msg(receiver, result)
+            local result2 = do_lex(msg, result)
+            if (result2 == nil) then 
+              result2 = result
+            end
+            _send_msg(receiver, result2)
             return
           end
         end
diff --git a/plugins/get.lua b/plugins/get.lua
index d9bad27..7f4631a 100644
--- a/plugins/get.lua
+++ b/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
 }
+