Emacs Lisp Cheat Sheet

Special form

special form has its own rule for which arguments are evaluated

Special Form
Purpose	Forms
Definition	defconst defun defvar
Binding constructs	let let* function
Conditional evaluation	and cond if or
Sequential evaluation	prog1 prog2 progn
Iteration	while function
Syntactic extension	defmacro
Quoting	quote
Assignment	setq setq-default
Nonlocal Exits	catch condition-case unwind-protect
Save	save-current-buffer save-excursion save-restriction save-window-excursion
Other	interactive track-mouse with-output-to-temp-buffer

buffer is a lisp object containing text to be edited

Buffer related function and *Variable*
Category	Functions Variable
Basic	bufferp current-buffer set-buffer save-current-buffer with-current-buffer with-temp-buffer
Buffer Names	buffer-name rename-buffer get-buffer generate-new-buffer-name
Buffer File Name	buffer-file-name buffer-file-name buffer-file-truename buffer-file-number get-file-buffer find-buffer-visting set-visted-file-name list-buffers-directory
Buffer Modification	buffer-modified-p set-buffer-modified-p restore-buffer-modified-p not-modified buffer-modified-tick buffer-chars-modified-tick
Buffer Modification Time	verify-visited-file-modtime clear-visited-file-modtime visited-file-modtime set-visited-file-modtime ask-user-about-supersession-threat
Read-Only Buffers	buffer-read-only inhibit-read-only toggle-read-only barf-if-buffer-read-only
Buffer List	buffer-list other-buffer last-buffer bury-buffer unbury-buffer
Creating Buffers	get-buffer-creat generate-new-buffer
Killing Buffers	kill-buffer kill-buffer-query-function kill-buffer-hook buffer-offer-save buffer-save-without-query buffer-live-p
Indirect Buffers	make-indirect-buffer clone-indirect-buffer buffer-base-buffer
Swapping Text Between Two Buffers	buffer-swap-text
Buffer Gap	gap-position gap-size

Text is manipulated through Buffer object with point and marker.

Text related function and *Vairalbe*
Category	Function Variable
Near Point	char-after char-before following-char preceding-char bobp eobp bolp eolp
Examining Buffer Contents	buffer-substring buffer-substring-no-properties buffer-string filter-buffer-substring filter-buffer-substring-function buffer-substring-filters current-word thing-at-point
Comparing Text	compare-buffer-substrings
Inserting Text	insert insert-before-markers insert-char insert-buffer-substring insert-buffer-substring-no-properties
User-Level Insertion Commands	insert-buffer self-insert-command newline overwrite-mode
Deleting Text	erase-buffer delete-region delete-and-extract-region delete-char delete-backward-char backwar-delete-char-untabify backward-delete-char-untabify-method
User-Level Deletion Commands	delete-horizontal-space delete-indentation fixup-whitespace just-one-space delete-blank-lines