An Introduction to Programming in Emacs Lisp phần 2 pptx

... form in Lisp that you will need to use in most function definitions. 22 Chapter 1: List Processing Buffer Names 23 2 Practicing Evaluation Before learning how to write a function definition in Emacs ... this: (buffer-name)"*scratch*" You cannot do this in Info since Info is read-only and it will not allow you to change the contents of the buffer. But you can do thi...

Ngày tải lên: 09/08/2014, 12:22

... evaluate the (beginning-of-line) expression and move point to the beginning of the line. Then there is an inner while loop. This while loop is designed to move the cursor out of the blank space between paragraphs, ... compiled and installed when Emacs is built. (etags is not an Emacs Lisp function or a part of Emacs; it is a C program.) To create a ‘TAGS’ file, first switch to...

Ngày tải lên: 09/08/2014, 12:22

... You can learn from it and mine it for ideas. Having GNU Emacs is like having a dragon’s cave of treasures. In addition to learning about Emacs as an editor and Emacs Lisp as a programming language, ... as an approachable hill, rather than as a daunting mountain. This introduction to Programming in Emacs Lisp has a companion doc- ument, The GNU Emacs Lisp Refe...

Ngày tải lên: 09/08/2014, 12:22

... looks like. Finally, the last line of the beginning-of-buffer command says to move point to the beginning of the next line if the command is invoked with an argument: (if arg (forward-line 1))) This ... command is a good function to start with since you are likely to be familiar with it and it is easy to understand. Used as an interactive command, beginning-of-buffer moves the c...

Ngày tải lên: 09/08/2014, 12:22

... text to the kill ring as the latest item, and sets the kill-ring-yank-pointer variable to p oint to it. 8.3 delete-and-extract-region: Digressing into C The zap -to- char command uses the delete-and-extract-region ... ring using the kill-new function. zap -to- char 89 8 Cutting and Storing Text Whenever you cut or clip text out of a buffer with a ‘kill’ command in GNU Emacs, it is sto...

Ngày tải lên: 09/08/2014, 12:22

... yank and yank- pop functions is: (insert (car kill-ring-yank-pointer)) To begin to understand how yank and yank-pop work, it is first necessary to look at the kill-ring-yank-pointer variable and ... the rotate-yank- pointer function. 10 .2 The kill-ring-yank-pointer Variable kill-ring-yank-pointer is a variable, just as kill-ring is a variable. It points to something by being bound t...

Ngày tải lên: 09/08/2014, 12:22

... automatically, but it is simpler to write a list manually. Here it is: (defvar top-of-ranges ’(10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 20 0 21 0 22 0 23 0 24 0 25 0 26 0 27 0 ... defuns-per-range-list)) (setq number-within-range 0) ; Reset count to zero. ;; Move to next range. (setq top-of-ranges (cdr top-of-ranges)) ;; Specify next top of range value...

Ngày tải lên: 09/08/2014, 12:22

... contains a good many suggestions as to what to put into your own ‘ .emacs file, or into a site-wide initialization file. 16 .2 Specifying Variables using defcustom You can specify variables using ... GNU Emacs, such as versions 20 and 21 , and use one ‘ .emacs file, you can select which code to evaluate with the following conditional: (cond ((string-equal (number -to- string 20 ) (sub...

Ngày tải lên: 09/08/2014, 12:22

... rotate-yank-pointer function changes the element in the kill ring to which kill-ring-yank-pointer points. For example, it can change kill-ring-yank-pointer from pointing to the second element to point ... expression and typing C-x C-e. Indeed, 1 is printed in the echo area.) Using % in rotate-yank-pointer When the kill-ring-yank-pointer points to the beginning of the kill ring,...

Ngày tải lên: 09/08/2014, 12:22