Cosmo is a "safe templates" engine. It allows you to fill nested templates, providing many of the advantages of Turing-complete template engines, without without the downside of allowing arbitrary code in the templates. The current version of Cosmo is 14.03.04. This release fixes a bug with the latest version of LPEG. The previous version, 13.01.30, added support for Lua 5.2. Version 10.04.06 added expressions to selectors $(\<exp\>), allowed nested \[\[ \]\] in templates, made commas between subtemplates optional, and added a second parameter to cosmo.yield that tells Cosmo the first parameter is a literal to be included in the expansion instead of an environment. Cosmo is installed as a rock. To install the most recent release do `luarocks install cosmo`. The Cosmo rock is in the standard repository. Installation on UNIX-based systems need the gcc toolchain.