Download e-book for iPad: An introduction to programming in emacs lisp by Robert J. Chassell

By Robert J. Chassell

ISBN-10: 1882114434

ISBN-13: 9781882114436

This educational an user-friendly creation to coach non-programmers tips on how to customise their paintings atmosphere; it could possibly even be used as an creation to programming fundamentals. It contains a number of routines and pattern courses; the writer additionally walks you thru the particular resource code of numerous GNU Emacs instructions. A convenient reference appendix is included.Emacs Lisp is an easy, entire, and strong programming language. it's the development block of GNU Emacs, that's an built-in improvement atmosphere with precise beneficial properties for scanning and parsing textual content in addition to for dealing with a number of documents, buffers, monitors, home windows, and sub-processors.

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Example text

Multiply-by-seven 3) The symbol number, specified in the function definition in the next section, is given or “bound to” the value 3 in the actual use of the function. Note that although number was inside parentheses in the function definition, the argument passed to the multiply-by-seven function is not in parentheses. The parentheses are written in the function definition so the computer can figure out where the argument list ends and the rest of the function definition begins. If you evaluate this example, you are likely to get an error message.

It passes this value and the number 1 to the + which adds them together. The sum is then returned as the value of the inner list and passed to the setq which sets the variable counter to this new value. Thus, the value of the variable, counter, is changed. 10 Summary Learning Lisp is like climbing a hill in which the first part is the steepest. You have now climbed the most difficult part; what remains becomes easier as you progress onwards. In summary, • Lisp programs are made up of expressions, which are lists or single atoms.

Write an expression that prints a message in the echo area when evaluated. 22 Chapter 1: List Processing Buffer Names 23 2 Practicing Evaluation Before learning how to write a function definition in Emacs Lisp, it is useful to spend a little time evaluating various expressions that have already been written. These expressions will be lists with the functions as their first (and often only) element. Since some of the functions associated with buffers are both simple and interesting, we will start with those.

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An introduction to programming in emacs lisp by Robert J. Chassell


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