$$<file.txt>

Added in

v0.2

Includes the content of the file directly into the current macro.

One macro can only contain up to ten includes, everyone after that gets ignored. In case you need a higher limit you have the ability to increase it from the config file. The config file is in .minecraft/liteconfig/common/macros/.macros.txt. There you have to change the compiler.maxinclude property.