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 ProcessingBuffer Names 23 2 Practicing EvaluationBefore 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 this in any buffer youcan edit; and when you write ... nil, nil, and some value." In this example, Emacs binds the symbol birch to the number 3, binds thesymbols pine and fir to nil, and binds the symbol oak to the value some.Note that in the...

An Introduction to Programming in Emacs Lisp phần 6 pptx

... evaluate the (beginning-of-line) expression and movepoint to the beginning of the line. Then there is an inner while loop. Thiswhile loop is designed to move the cursor out of the blank space betweenparagraphs, ... compiled and installedwhen 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 the directory in which you want to create ... triangle-initialization an argument of 2, to find outhow many pebbles there are in a triangle with two rows.That function calls (triangle-recursive-helper 0 0 2) . In stages, the instances called...

An Introduction to Programming in Emacs Lisp phần 1 ppt

... You canlearn from it and mine it for ideas. Having GNU Emacs is like having adragon’s cave of treasures. In addition to learning about Emacs as an editor and Emacs Lisp asa programming language, ... as an approachable hill, rather than as a dauntingmountain.This introduction to Programming in Emacs Lisp has a companion doc-ument, The GNU Emacs Lisp Reference Manual. The reference manual ... Emacs Lisp as you would any other programming language.Perhaps you want to understand programming; perhaps you want to ex-tend Emacs; or perhaps you want to become a programmer. This introduc-tion...

An Introduction to Programming in Emacs Lisp phần 3 ppt

... looks like.Finally, the last line of the beginning-of-buffer command says to movepoint 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 withsince you are likely to be familiar with it and it is easy to understand. Usedas an interactive command, beginning-of-buffer moves the cursor to thebeginning ... same way as it is written in beginning-of-buffer.The expression moves the cursor to the minimum point in the buﬀer, that is, to the beginning of the buﬀer (or to the beginning of the accessible...

An Introduction to Programming in Emacs Lisp phần 4 pot

... text to the kill ring as thelatest item, and sets the kill-ring-yank-pointer variable to p oint to it.8.3 delete-and-extract-region: Digressing into CThe zap -to- char command uses the delete-and-extract-region ... ring using thekill-new function.zap -to- char 898 Cutting and Storing TextWhenever you cut or clip text out of a buﬀer with a ‘kill’ command in GNU Emacs, it is stored in a list and you can ... ’menu-bar-update-yank-menu)(menu-bar-update-yank-menu string (and replace (car kill-ring))))(if (and replace kill-ring)(setcar kill-ring string)(setq kill-ring (cons string kill-ring))(if (> (length kill-ring) kill-ring-max)(setcdr...

An Introduction to Programming in Emacs Lisp phần 5 pps

... 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 Variablekill-ring-yank-pointer is a variable, just as kill-ring is a variable.It points to something by being bound to the value ... rotate-yank-pointer function changes the element in the kill ring to which the kill-ring-yank-pointer points; when the pointer is set to point to the next element beyond the end of the kill ring,...

An Introduction to Programming in Emacs Lisp phần 7 pot

... automatically, but it is simpler to write a list manually. Here it is:(defvar top-of-ranges’(10 20 30 40 5060 70 80 90 100110 120 130 140 150160 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.(setq top-of-range (car top-of-ranges)));; ... moves point to the beginning of an enclosing or pre-ceding function deﬁnition, or else to the beginning of the buﬀer. We can usebeginning-of-defun to place point where we wish to start.The...

An Introduction to Programming in Emacs Lisp phần 8 ppsx

... 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 defcustomYou can specify variables using ... GNU Emacs, such as versions 20 and 21 , anduse one ‘ .emacs file, you can select which code to evaluate with the followingconditional:(cond((string-equal (number -to- string 20 ) (substring (emacs- version) ... written in Emacs Lisp, tell Emacs what to do.1A ‘~/ .emacs file contains Emacs Lisp code. You can write this codeyourself; or you can use Emacs customize feature to write the code foryou. You can...

An Introduction to Programming in Emacs Lisp phần 9 pps

... rotate-yank-pointer function changes the element in the kill ring to which kill-ring-yank-pointer points. For example, it can changekill-ring-yank-pointer from pointing to the second element to point ... expression and typingC-x C-e. Indeed, 1 is printed in the echo area.)Using % in rotate-yank-pointerWhen the kill-ring-yank-pointer points to the beginning of the killring, and the argument passed to ... rotate-yank-pointer Function 24 3Appendix B Handling the Kill RingThe kill ring is a list that is transformed into a ring by the workings of therotate-yank-pointer function. The yank and yank-pop...

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