Fix: Crash due to function being out of scope

Tracks Properties/Lokasenna_Show only specified tracks.lua

@@ -1,10 +1,10 @@
 --[[
     Description: Show only specified tracks
-    Version: 1.4.1
+    Version: 1.4.2
     Author: Lokasenna
     Donation: https://paypal.me/Lokasenna
     Changelog:
-        Fix: Issues with siblings of top-level tracks
+        Fix: Crash referring to "merge_tables" being nil
     Links:
         Lokasenna's Website http://forum.cockos.com/member.php?u=10417
     About:
@@ -35,19 +35,19 @@ end
 
 -- Returns true if the individual words of str_b all appear in str_a
 local function fuzzy_match(str_a, str_b)
-    
+
     if not (str_a and str_b) then return end
     str_a, str_b = string.lower(tostring(str_a)), string.lower(tostring(str_b))
-    
+
     --Msg("\nfuzzy match, looking for:\n\t" .. str_b .. "\nin:\n\t" .. str_a .. "\n")
-    
+
     for word in string.gmatch(str_b, "[^%s]+") do
         --Msg( tostring(word) .. ": " .. tostring( string.match(str_a, word) ) )
         if not string.match(str_a, word) then return end
     end
 
     return true
-    
+
 end
 
 
@@ -69,6 +69,25 @@ local function is_match(str, tr_name, tr_idx)
 end
 
 
+local function merge_tables(...)
+
+  local tables = {...}
+
+  local ret = {}
+  for i = #tables, 1, -1 do
+      if tables[i] then
+          for k, v in pairs(tables[i]) do
+              if v then ret[k] = v end
+          end
+      end
+  end
+
+  return ret
+
+end
+
+
+
 -- Returns an array of MediaTrack == true for all parents of the given MediaTrack
 local function recursive_parents(track)
     if reaper.GetTrackDepth(track) == 0 then
@@ -149,7 +168,7 @@ local function get_siblings(tracks)
                 -- siblings to false
                 if reaper.GetTrackDepth( reaper.GetTrack(0, child_idx-1) ) == sibling_depth then
                     siblings[child_idx] = true
-                end            
+                end
 
             end
 
@@ -167,35 +186,17 @@ local function get_siblings(tracks)
 end
 
 
-local function merge_tables(...)
-
-    local tables = {...}
-
-    local ret = {}
-    for i = #tables, 1, -1 do
-        if tables[i] then
-            for k, v in pairs(tables[i]) do
-                if v then ret[k] = v end
-            end
-        end
-    end
-
-    return ret
-
-end
-
-
 local function get_tracks_to_show(settings)
     --[[
         settings = {
             search = str,
 
-            matchmultiple = bool, 
+            matchmultiple = bool,
             matchonlytop = bool,
             showchildren = bool,
             showparents = bool,
 
-            mcp = bool, 
+            mcp = bool,
             tcp = bool
         }
     ]]--
@@ -272,16 +273,16 @@ end
 
 
 if script_filename ~= "Lokasenna_Show only specified tracks.lua" then
-    
+
     local tracks = get_tracks_to_show(settings)
     if tracks then
         set_visibility( tracks, settings )
     else
         reaper.MB("Error reading the script's settings. Make sure you haven't edited the script at all.", "Whoops!", 0)
     end
-    
+
     return
-    
+
 end
 
 
@@ -320,11 +321,11 @@ end
 
 
 local function apply_settings()
-    
+
     local settings = get_settings()
     local tracks = get_tracks_to_show(settings)
     set_visibility(tracks, settings)
-    
+
 end
 
 
@@ -349,7 +350,7 @@ local function table_to_code(settings)
     }
 
     for k, v in pairs(settings) do
-        local param = type(v) == "boolean"  and tostring(v) 
+        local param = type(v) == "boolean"  and tostring(v)
                                             or  ('"' .. tostring(v) .. '"')
         strs[#strs+1] = '\t' .. k .. ' = ' .. param .. ','
     end
@@ -364,7 +365,7 @@ end
 local function get_settings_to_export()
 
     return table_to_code( get_settings() )
-    
+
 end
 
 
@@ -386,21 +387,21 @@ local function continue_export(alias)
         return
     end
 
-    local arr, copying = {}    
+    local arr, copying = {}
     --make sure to add a header tag, "generated by" etc.
     arr[1] = "-- This script was generated by " .. script_filename .. "\n"
 
     arr[2] = "\n" .. get_settings_to_export() .. "\n"
 
     for line in file_in:lines() do
-        
+
         if copying then
             if string.match(line, "-- END FILE COPY HERE") then break end
             arr[#arr + 1] = line
-        elseif string.match(line, "-- BEGIN FILE COPY HERE") then 
+        elseif string.match(line, "-- BEGIN FILE COPY HERE") then
             copying = true
-        end 
-        
+        end
+
     end
 
 
@@ -412,7 +413,7 @@ local function continue_export(alias)
     if err then
         reaper.MB("Error opening output file:\n" .. script_path..name_out .. "\n\n".. tostring(err), "Whoops!", 0)
         return
-    end    
+    end
     file_out:write(table.concat(arr, "\n"))
     file_out:close()
 
@@ -431,7 +432,7 @@ end
 local function btn_export()
 
     GUI.GetUserInputs("Saving settings", {"Name for this preset:"}, {""}, continue_export, 0)
-    
+
 end
 
 
@@ -544,7 +545,7 @@ GUI.New("chk_showopts", "Checklist", {
     shadow = true,
     swap = nil,
     opt_size = 20
-}) 
+})
 
 GUI.New("chk_apply", "Checklist", {
     z = 11,