lua move strip_extension and create_numbered_filename out of main binary

rb.strip_extension and rb.create_numbered_filename
have been moved to include_lua/files.lua
to use simply add require('files') to your script

Change-Id: I95af7b312c8614cb10da4b71b22714b3e282e08a

apps/plugins/lua/include_lua/files.lua

@@ -0,0 +1,42 @@
+rb = rb or {}
+rb.create_numbered_filename = function (sPath, sPrefix, sSuffix, iNumLen, iNum)
+    iNum = iNum or -1
+    local dir_iter, dir_data = luadir.dir(sPath)
+    local status = true
+    local name, isdir, num
+    local name_pat = sPrefix .. '(%d+)' .. sSuffix
+    local file_pat
+    local max_num = iNum < 0 and -1 or iNum -- Number specified
+
+    if max_num < 0 then
+        max_num = 0 -- automatic numbering
+        repeat
+            status, name, isdir = pcall(dir_iter, dir_data)
+            if status then
+                if name and not isdir then
+                    num = string.match(name, name_pat)
+                    if (not iNumLen) and num then -- try to match existing zero padding
+                        local s, e = string.find(num, "^0+")
+                        if s and e then iNumLen = (e - s) end
+                    end
+                    num = tonumber(num)
+                    if num and (num > max_num) then 
+                        max_num = num
+                    end
+                end
+            end
+        until not status
+    end
+    max_num = max_num + 1
+    iNumLen = iNumLen or 0
+    file_pat = "%s/%s%0" .. iNumLen .. "d%s"
+    return string.format(file_pat, sPath, sPrefix, max_num, sSuffix), max_num
+end
+
+rb.strip_extension = function (sFileName)
+    sFileName = sFileName or ""
+    local ext = rb.strrchr(sFileName, string.byte("."));
+    local len = string.len(ext or "")
+    if len > 0 then sFileName = string.sub(sFileName, 1, -(len + 1)) end
+    return sFileName
+end