Introductory Beginning

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

By Robert J. Chassell

This educational an straight forward creation to coach non-programmers how you can customise their paintings surroundings; it could actually even be used as an advent to programming fundamentals. It contains various workouts 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 construction block of GNU Emacs, that's an built-in improvement setting with precise good points for scanning and parsing textual content in addition to for dealing with a number of documents, buffers, screens, home windows, and sub-processors.

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Note that when you call the function multiply-by-seven, the message is printed without quotes, but when you call message, the text is printed in double quotes. 4 Different Options for interactive In the example, multiply-by-seven used "p" as the argument to interactive. This argument told Emacs to interpret your typing either C-u followed by a number or META followed by a number as a command to pass that number to the function as its argument. Emacs has more than twenty characters predefined for use with interactive.

7 number)) This definition begins with a parenthesis and the symbol defun, followed by the name of the function. The name of the function is followed by a list that contains the arguments that will be passed to the function. This list is called the argument list. In this example, the list has only one element, the symbol, number. When the function is used, the symbol will be bound to the value that is used as the argument to the function. Instead of choosing the word number for the name of the argument, I could have picked any other name.

1 Using set To set the value of the symbol flowers to the list ’(rose violet daisy buttercup), evaluate the following expression by positioning the cursor after the expression and typing C-x C-e. (set ’flowers ’(rose violet daisy buttercup)) 18 Chapter 1: List Processing The list (rose violet daisy buttercup) will appear in the echo area. This is what is returned by the set function. As a side effect, the symbol flowers is bound to the list ; that is, the symbol flowers, which can be viewed as a variable, is given the list as its value.

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