Emacs Lisp Cheat Sheet
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Special form
special form has its own rule for which arguments are evaluated
| 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 |
Standard Library
Number
Emacs supports two numeric data types: integers and floating point numbers
| Category | Functions Variable |
| Integer Basics | most-positive-fixnum most-negative-fixnum |
| Floating Point Basics | logb float-e float-pi |
| Type Predicate Test | floatp integerp numberp wholenump zerop |
| Comparison | = eql /= < <= > >= max min abs |
| Conversions | float truncate floor ceiling round |
| Arithmetic Operations | 1+ 1- + - * / % mod |
| Rounding Operations | ffloor fceiling ftruncate fround |
| Bitwise Operations | lsh ash logand logior logxor lognot |
| Mathematical Functions | sin cos tan asin acos atan exp log log10 expt sqrt |
| Random Numbers | random |
Character
See String section
String
A string in Emacs Lisp is an array that contains an ordered sequence of characters
| Category | Functions Variable |
| Predicates for Strings | stringp string-or-null-p char-or-string-p |
| Creating Strings | make-string string substring substring-no-properties concat split-string split-string-default-separators |
| Modifying Strings | store-substring clear-string |
| Comparison | char-equal string= string-equal string< string-lessp compare-strings assoc-string |
| Conversion | number-to-string string-to-number char-to-string string-to-char |
| Formatting Strings | format |
| Case Conversion | downcase upcase capitalize upcase-initials |
| The Case Table | case-table-p set-standard-case-table standard-case-table current-case-table set-case-table with-case-table ascii-case-table set-case-syntax-pair set-case-syntax-delims set-case-syntax describe-buffer-case-table |
List
Lists are built up from cons cells
| Category | Functions Variable |
| List-related Predicates | consp atom listp nlistp null |
| List Elements | car cdr car-safe cdr-safe pop nth nthcdr last safe-length caar cadr cadr cadr butlast nbutlast |
| Building Lists | cons list make-list append reverse copy-tree number-sequence |
| List Variables | push add-to-list add-to-ordered-list |
| Modifying Lists | setcar setcdr nconc nreverse sort |
| Sets And Lists | memq delq remq memql member delete remove member-ignore-case delete-dups |
| Association Lists | assoc rassoc sassq rassq assoc-default copy-alist assq-delete-all rassq-delete-all |
| Rings | make-ring ring-p ring-size ring-length ring-elements ring-copy ring-empty-p ring-ref ring-insert ring-remove ring-insert-at-beginning |
Vector
Sequence
Hash Tables
Symbols
Minibuffer
Keymaps
File
Buffer
buffer is a lisp object containing text to be edited
| 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 |
Windows
Frames
Positons
Marker
Text (unfinished)
Text is manipulated through Buffer object with point and marker.
| 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 |