An Introduction to Programming in Emacs Lisp phần 6 pptx

... specifying the language; it recognizes the language in an inputfile according to its file name and contents.‘etags’ is very helpful when you are writing code yourself and want to refer back to functions ... 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...

An Introduction to Programming in Emacs Lisp phần 2 pptx

... 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 ... 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 ... how Emacs works.When you type keys, you cause the Lisp interpreter to evaluate an expres-sion and that is how you get your results. Even typing plain text involvesevaluating an Emacs Lisp...

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 ... 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 portion 46 Chapter ... 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...

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 ... been printed in the echo area, the save-excursion restores point and mark to their originalpositions; and save-restriction restores the original narrowing, if any. 6. 3 Exercise with NarrowingWrite ... 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...

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 ... 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, ... 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...

An Introduction to Programming in Emacs Lisp phần 7 pot

... 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 ... for an openingdelimiter such as a ‘(’ at the beginning of a line, and moves point to thatposition, or else to the limit of the search. In practice, this means thatbeginning-of-defun moves point ... Counting Words in a defunWe will want our new function, files -in- below-directory, to list the‘.el’ files in the directory it is told to check, and in any directories belowthat directory.This gives...

An Introduction to Programming in Emacs Lisp phần 8 ppsx

... “Autoload” in The GNU Emacs Lisp Reference Manual, formore information. 16. 11 A Simple Extension: line -to- top-of-windowHere is a simple extension to Emacs that moves the line point is on to the ... 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 ... “The Init File” in The GNU Emacs Manual, and section “The Init File” in The GNU Emacs Lisp Reference Manual. 16. 1 Site-wide Initialization Files In addition to your personal initialization file, Emacs...

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 ... 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 ... Reference Manual has to say byvisiting the manual in Info, and typing i (Info-index) and the name of thefunction, or by looking up skip-chars-forward in the index to a printedcopy of the manual.Similarly,...

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