NiCHE (Network in Canadian History & Environment) has a useful wiki called The Programming Historian by William Turkel and Alan MacEachern. The wiki is a “tutorial-style introduction to programming for practicing historians” but it is could also be used by textual scholars who want to be able to program their own tools. It takes you through learning and using Python for text processing for things like word frequencies and KWICs. It reminds me of Susan Hockey’s book, Snobol Programming for the Humanities. (Oxford: Oxford University Press, 1985) which I loved at the time, even if I couldn’t find a Snobol interpreter for the Mac.
We need more of such books/wikis.