Can you recommend a book for programming functionality for LaTeX? [closed]

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As a LaTeX newbie I want to start using it and extending it with my own stuff. I have some ideas for solutions for technical writing, which aren't solved until now. So I need a good book on LaTeX which looks at it from a programmers point of view. Like how does LaTeX actually work internally, how does all the stuff fit together, and where do I have to start touching code or adding code to get things working. Well you know what I mean right? :)

So is there any good book I should look at?

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There is no subsitute for reading the TeXbook, which is Don Knuth's original documentation of TeX. It is a tutorial not a reference, and if you are like most people you will have to read it twice (skipping 'dangerous bends' on the first pass) and do some of the exercises. Answers to all of the exercises are in the back of the book.

You can then move on to the LaTeX Companion (I prefer the first edition; subsequent editions are bloated), which has many examples and which has a short "Guide for Class and Package Writers." The appendices to Lamport's LaTeX manual are also (just barely) useful.

I need a good book on LaTeX which looks at it from a programmers point of view

LaTeX is only a bunch of hacks piled on top of TeX. To understand the programming model you must read the TeXbook—it's the only place that explains how things actually work, the full truth, in detail. After you master the TeXbook you will be able to read things like the latex.ltx source and do whatever you want.

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I would recommend Guide to LaTeX by Kopka, Daly instead of the Knuth book because it is more up-to-date, and is very thorough for all features in LaTeX.

Of course, it is not for a complete beginner. Always start from the excellent (and free) guide, The Not So Short Introduction to LATEX2ε

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Internals: read Knuth's The TeX book. And then Knuth's TeX: The Program.

Latex's internals are not very exciting, but the code is free software: you can read it. But the key is understanding Tex.