Hi @lazy boy!
The Code Macro for Confluence uses the open source syntaxhighlighter library. There are many language files for this library out there on the Internet - here's a blog post that summarizes some of them: http://www.undermyhat.org/blog/2009/09/list-of-brushes-syntaxhighligher/ I did a quick google search and I found a TCL language file that somebody's written: https://gist.github.com/henix/2851521
If you trust this language file and its license conditions are acceptable for you to use, you can go into Confluence admin and go to the "Configure Code Macro" section, and then there's an option to upload a new language file.
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