Emacs

Zmacs, an Emacs for Lisp machines, an evolution of EINE and ZWEI

James Gosling wrote an Emacs-like editor to run on Unix (Gosling Emacs) in 1981

In the following years, programmers wrote a variety of Emacs-like editors for other computer systems. These included EINE (EINE Is Not EMACS) and ZWEI[25] (ZWEI Was EINE Initially), which were written for the Lisp machine by Mike McMahon and Daniel Weinreb, and Sine (Sine Is Not Eine),[26] which was written by Owen Theodore Anderson. Weinreb's EINE was the first Emacs written in Lisp. In 1978, Bernard Greenberg wrote Multics Emacs almost entirely in Multics Lisp at Honeywell's Cambridge Information Systems Lab. Multics Emacs was later maintained by Richard Soley, who went on to develop the NILE Emacs-like editor for the NIL Project, and by Barry Margolin. Many versions of Emacs, including GNU Emacs, would later adopt Lisp as an extension language.

James Gosling, who would later invent NeWS and the Java programming language, wrote Gosling Emacs in 1981. The first Emacs-like editor to run on Unix, Gosling Emacs was written in C and used Mocklisp, a language with Lisp-like syntax, as an extension language.

Early Ads for Computer Corporation of America's CCA EMACS (Steve Zimmerman)[27] appeared in 1984.[28] 1985 comparisons to GNU Emacs, when it came out, mentioned free vs. $2,400.[29]

GNU Emacs running in a text console

GNU Emacs running on Microsoft Windows

Richard Stallman began work on GNU Emacs in 1984 to produce a free software alternative to the proprietary Gosling Emacs. GNU Emacs was initially based on Gosling Emacs, but Stallman's replacement of its Mocklisp interpreter with a true Lisp interpreter required that nearly all of its code be rewritten. This became the first program released by the nascent GNU Project. GNU Emacs is written in C and provides Emacs Lisp, also implemented in C, as an extension language. Version 13, the first public release, was made on March 20, 1985. The first widely distributed version of GNU Emacs was version 15.34, released later in 1985. Early versions of GNU Emacs were numbered as 1.x.x, with the initial digit denoting the version of the C core. The 1 was dropped after version 1.12, as it was thought that the major number would never change, and thus the numbering skipped from 1 to 13.[30] In September 2014, it was announced on the GNU emacs-devel mailing list that GNU Emacs would adopt a rapid release strategy and version numbers would increment more quickly in the future.[31]

GNU Emacs offered more features than Gosling Emacs, in particular a full-featured Lisp as its extension language, and soon replaced Gosling Emacs as the de facto Unix Emacs editor. Markus Hess exploited a security flaw in GNU Emacs' email subsystem in his 1986 cracking spree in which he gained superuser access to Unix computers.[32]

Most of GNU Emacs functionality is implemented through a scripting language called Emacs Lisp. Because about 70% of GNU Emacs is written in the Emacs Lisp extension language,[33] one only needs to port the C core which implements the Emacs Lisp interpreter. This makes porting Emacs to a new platform considerably less difficult than porting an equivalent project consisting of native code only.

GNU Emacs development was relatively closed until 1999 and was used as an example of the Cathedral development style in The Cathedral and the Bazaar. The project has since adopted a public development mailing list and anonymous CVS access. Development took place in a single CVS trunk until 2008 and was then switched to the Bazaar DVCS. On November 11, 2014, development was moved to Git.[34]

Richard Stallman has remained the principal maintainer of GNU Emacs, but he has stepped back from the role at times. Stefan Monnier and Chong Yidong were maintainers from 2008 to 2015.[35][36] John Wiegley was named maintainer in 2015 after a meeting with Stallman at MIT.[37] As of early 2014, GNU Emacs has had 579 individual committers throughout its history.[38]

XEmacs 21.5 on Linux

Lucid Emacs, based on an early alpha version of GNU Emacs 19, was developed beginning in 1991 by Jamie Zawinski and others at Lucid Inc. One of the best-known early forks in free software development occurred when the codebases of the two Emacs versions diverged and the separate development teams ceased efforts to merge them back into a single program.[39] Lucid Emacs has since been renamed XEmacs. Its development is currently inactive, with the most recent stable version 21.4.22 released in January 2009 (while a beta was released in 2013), while GNU Emacs has implemented many formerly XEmacs-only features.[40]

Other notable forks include:

• Aquamacs – based on GNU Emacs (Aquamacs 3.2 is based on GNU Emacs version 24 and Aquamacs 3.3 is based on GNU Emacs version 25) which focuses on integrating with the Apple Macintosh user interface
• Meadow – a Japanese version for Microsoft Windows[41]

uEmacs/Pk 4.0.15 on Linux

The mg tiny Emacs-like editor in OpenBSD 5.3. Editing Ruby source code

JOVE running in a Debian box

In the past, projects aimed at producing small versions of Emacs proliferated. GNU Emacs was initially targeted at computers with a 32-bit flat address space and at least 1 MiB of RAM.[42] Such computers were high end workstations and minicomputers in the 1980s, and this left a need for smaller reimplementations that would run on common personal computer hardware. Today's computers have more than enough power and capacity to eliminate these restrictions, but small clones have more recently been designed to fit on software installation disks or for use on less capable hardware.[43]

Other projects aim to implement Emacs in a different dialect of Lisp or a different programming language altogether. Although not all are still actively maintained, these clones include:

• MicroEMACS, which was originally written by Dave Conroy and further developed by Daniel Lawrence and which exists in many variations.
• mg, originally called MicroGNUEmacs and, later, mg2a, a public-domain offshoot of MicroEMACS intended to more closely resemble GNU Emacs. Now installed by default on OpenBSD.
• JOVE (Jonathan's Own Version of Emacs), Jonathan Payne's non-programmable Emacs implementation for UNIX-like systems.
• MINCE (MINCE Is Not Complete Emacs), a version for CP/M and later DOS, from Mark of the Unicorn. MINCE evolved into Final Word, which eventually became the Borland Sprint word processor.
• Perfect Writer, a CP/M implementation derived from MINCE that was included circa 1982 as the default word processor with the very earliest releases of the Kaypro II and Kaypro IV. It was later provided with the Kaypro 10 as an alternative to WordStar.
• Freemacs, a DOS version that uses an extension language based on text macro expansion and fits within the original 64 KiB flat memory limit.
• Zmacs, for the MIT Lisp Machine and its descendants, implemented in ZetaLisp.
• Epsilon,[44] an Emacs clone by Lugaru Software. Versions for DOS, Windows, Linux, FreeBSD, Mac OS X and OS/2 are bundled in the release. It uses a non-Lisp extension language with C syntax and used a very early concurrent command shell buffer implementation under the single-tasking MS-DOS.
• PceEmacs is the Emacs-based editor for SWI-Prolog.
• Hemlock, originally written in Spice Lisp, then Common Lisp. A part of CMU Common Lisp. Influenced by Zmacs. Later forked by Lucid Common Lisp (as Helix), LispWorks and Clozure CL projects. There is also a Portable Hemlock project, which aims to provide a Hemlock, which runs on several Common Lisp implementations.
• edwin, an Emacs-like text editor included with MIT/GNU Scheme.

• The Cocoa text system uses some of the same terminology and understands many Emacs navigation bindings. This is possible because the native UI uses the Command key (equivalent to Super) instead of the Control key.[45]
• Eclipse (IDE) provides a set of Emacs keybindings.
• Epsilon (text editor) Defaults to Emacs emulation and supports a vi mode.
• GNOME Builder has an emulation mode for Emacs.
• GNU Readline is a line editor that understands the standard Emacs navigation keybindings. It also has a vi emulation mode.
• IntelliJ IDEA provides a set of Emacs keybindings.
• JED has an emulation mode for Emacs.
• Joe's Own Editor emulates Emacs keybindings when invoked as jmacs.
• MATLAB provides Emacs keybindings for its editor.[46]
• KornShell has an Emacs line editing mode that predates Gnu Readline.[47]
• Visual Studio Code provides an extension to emulate Emacs keybindings.
• Oracle SQL Developer can save and load alternative keyboard-shortcut layouts. One of the built-in layouts provides Emacs-like keybindings, including using different commands to achieve closer behavior.

Almost all of the functionality in Emacs, including basic editing operations such as the insertion of characters into a file, is achieved through functions written in a dialect of the Lisp programming language. The dialect used in GNU Emacs is known as Emacs Lisp (Elisp), and was developed expressly to port Emacs to GNU and Unix. The Emacs Lisp layer sits atop a stable core of basic services and platform abstraction written in the C programming language, which enables GNU Emacs to be ported to a wide variety of operating systems and architectures without modifying the implementation semantics of the Lisp system where most of the editor lives. In this Lisp environment, variables and functions can be modified with no need to rebuild or restart Emacs, with even newly redefined versions of core editor features being asynchronously compiled and loaded into the live environment to replace existing definitions. Modern GNU Emacs features both bytecode and native code compilation for Emacs Lisp.

All configuration is stored in variables, classes, and data structures, and changed by simply updating these live. The use of a Lisp dialect in this case is a key advantage, as Lisp syntax consists of so-called symbolic expressions (or sexprs), which can act as both evaluatable code expressions and as a data serialisation format akin to, but simpler and more general than, well known ones such as XML, JSON, and YAML. In this way there is little difference in practice between customising existing features and writing new ones, both of which are accomplished in the same basic way. This is operatively different from most modern extensible editors, for instance such as VS Code, in which separate languages are used to implement the interface and features of the editor and to encode its user-defined configuration and options. The goal of Emacs' open design is to transparently expose Emacs' internals to the Emacs user during normal use in the same way that they would be exposed to the Emacs developer working on the git tree, and to collapse as much as possible of the distinction between using Emacs and programming Emacs, while still providing a stable, practical, and responsive editing environment for novice users.

The main text editing data structure is the buffer, a memory region containing data (usually text) with associated attributes. The most important of these are:

• The point: the editing cursor;
• The mark: a settable location which, along with the point, enables selection of
• The region: a conceptually contiguous collection of text to which editing commands will be applied;
• The name and inode of the file the buffer is visiting (if any);
• The default directory, where any OS-level commands will be executed from by default;
• The buffer's modes, including a major mode possibly several minor modes
• The buffer encoding, the method by which Emacs represents buffer data to the user;
• and a variety of buffer local variables and Emacs Lisp state.

Modes, in particular, are an important concept in Emacs, providing a mechanism to disaggregate Emacs' functionality into sets of behaviours and keybinds relevant to specific buffers' data. Major modes provide a general package of functions and commands relevant to a buffer's data and the way users might be interacting with it (e.g. editing source code in a specific language, editing hex, viewing the filesystem, interacting with git, etc.), and minor modes define subsidiary collections of functionality applicable across many major modes (such as auto-save-mode). Minor modes can be toggled on or off both locally to each buffer as well as globally across all buffers, while major modes can only be toggled per-buffer. Any other data relevant to a buffer but not bundled into a mode can be handled by simply focussing that buffer and live modifying the relevant data directly.

Any interaction with the editor (like key presses or clicking a mouse button) is realized by evaluating Emacs Lisp code, typically a command, which is a function explicitly designed for interactive use. Keys can be arbitrarily redefined and commands can also be accessed by name; some commands evaluate arbitrary Emacs Lisp code provided by the user in various ways (e.g. a family of eval- functions, operating on the buffer, region, or individual expression). Even the simplest user inputs (such a printable characters) are effectuated as Emacs Lisp functions, such as the self-insert-command , bound by default to most keyboard keys in a typical text editing buffer, which parameterises itself with the locale-defined character associated with the key used to call it.

For example, pressing the f key in a buffer that accepts text input evaluates the code (self-insert-command 1 ?f), which inserts one copy of the character constant ?f at point. The 1, in this case, is determined by what Emacs terms the universal argument: all Emacs command code accepts a numeric value which, in its simplest usage, indicates repetition of an action, but in more complex cases (where repetition doesn't make sense) can yield other behaviours. These arguments may be supplied via command prefices, such as Control+u 7 f, or more compactly Meta+7 f, which expands to (self-insert-command 7 ?f). When no prefix is supplied, the universal argument is 1: every command implicitly runs once, but may be called multiply, or in a different way, when supplied with such a prefix. Such arguments may also be non-positive where it makes sense for them to be so - it is up to the function accepting the argument to determine, according to its own semantics, what a given number means to it. One common usage is for functions to perform actions in reverse simply by checking the sign of the univeral argument, such as a sort command which sorts in obverse by default and in reverse when called with a negative argument, using the absolute value of its argument as the sorting key (e.g. -7 sorting in reverse by column index (or delimiter) 7), or undo/redo, which are simply negatives of each other (traversing forward and backward through a recursive history of diffs by some number of steps at a time).

Because of its relatively large vocabulary of commands, Emacs features a long-established command language, to concisely express the keystrokes necessary to perform an action. This command language recognises the following shift and modifier keys: Ctrl, Alt, ⇧ Shift, Meta, Super, and Hyper. Not all of these may be present on an IBM-style keyboard, though they can usually be configured as desired. These are represented in command language as the respective prefices: C-, A-, S-, M-, s-, and H-. Keys whose names are only printable with more than one character are enclosed in angle brackets. Thus, a keyboard shortcut such as Ctrl+Alt+⇧ Shift+F9 (check dependent formulas and calculate all cells in all open workbooks in Excel) would be rendered in Emacs command language as C-A-S-<f9>, while an Emacs command like Meta+s f Ctrl+Meta+s (incremental file search by filename-matching regexp), would be expressed as M-s f C-M-s. Command language is also used to express the actions needed to invoke commands with no assigned shortcut: for example, the command scratch-buffer (which initialises a buffer in memory for temporary text storage and manipulation), when invoked by the user, will be reported back as M-x scra <return>, with Emacs scanning the namespace of contextually available commands to return the shortest sequence of keystrokes which uniquely lexicate it.

Because Emacs predates modern standard terminology for graphical user interfaces, it uses somewhat divergent names for familiar interface elements. Buffers, the data that Emacs users interact with, are displayed to the user inside windows, which are tiled portions of the terminal screen or the GUI window, which Emacs refers to as frames; in modern terminology, an Emacs frame would be a window and an Emacs window would be a split. Depending on configuration, windows can include their own scroll bars, line numbers, sometimes a 'header line' typically to ease navigation, and a mode line at the bottom (usually displaying buffer name, the active modes and point position of the buffer among others). The bottom of every frame is used for output messages (then called 'echo area') and text input for commands (then called 'minibuffer').

In general, Emacs display elements (windows, frames, etc.) do not belong to any specific data or process. Buffers are not associated with windows, and multiple windows can be opened onto the same buffer, for example to track different parts of a long text side-by-side without scrolling back and forth, and multiple buffers can share the same text, for example to take advantage of different major modes in a mixed-language file. Similarly, Emacs instances are not associated with particular frames, and multiple frames can be opened displaying a single running Emacs process, e.g. a frame per screen in a multi-monitor setup, or a terminal frame connected via ssh from a remote system and a graphical frame displaying the same Emacs process via the local system's monitor.

Just as buffers don't require windows, running Emacs processes do not require any frames, and one common usage pattern is to deploy Emacs as an editing server: running it as a headless daemon and connecting to it via a frame-spawning client. This server can then be made available in any situation where an editor is required, simply by declaring the client program to be the user's EDITOR or VISUAL variable. Such a server continues to run in the background, managing any child processes, accumulating stdin from open pipes, ports, or fifos, performing periodic or pre-programmed actions, remembering buffer undo history, saved text snippets, command history, and other user state between editing sessions. In this mode of operation, Emacs overlaps the functionality of programs like screen and tmux.

Because of its separation of display concerns from editing functionality, Emacs can display roughly similarly on any device more complex than a dumb terminal, including providing typical graphical WIMP elements on sufficiently featureful text terminals - though graphical frames are the preferred mode of display, providing a strict superset of the features of text terminal frames.

• User actions can be recorded into macros and replayed to automate complex, repetitive tasks. This is often done on an ad-hoc basis, with each macro discarded after use, although macros can be saved and invoked later.
  • Because of the uniformity of Emacs' features' definition in terms of Emacs Lisp, what counts as a "user action" for the purposes of macro-automation is flexible: macros may include, e.g., keypresses, commands, mouse clicks, other macros, and anything that can be effectuated via these. Macros can thus be recursive, and can be defined and invoked inside of macros.
• At startup, Emacs executes an Emacs Lisp script named ~/.emacs (recent versions also look for ~/emacs.el, ~/.emacs.d/init.el, and ~/.config/emacs/init.el;[48], as well as similar variations on ~/.config/emacs/early-init.el.[49] Emacs reads early-init.el first if it exists, and it can be used to configure or short-circuit core Emacs features before they load, such as the graphical display system or package manager. It will then execute the first version .emacs or init.el that it finds, ignoring the rest. This personal customization file can be arbitrarily long and complex, but typical content includes:
  • Setting global variables or invoking functions to customize Emacs behaviour, for example (set-default-coding-systems 'utf-8)
  • Key bindings to override standard ones and to add shortcuts for commands that the user finds convenient but don't have a key binding by default. Example: (global-set-key (kbd "C-x C-b") 'ibuffer)
  • Loading, enabling and initializing extensions (Emacs comes with many extensions, but only a few are loaded by default.)
  • Configuring event hooks to run arbitrary code at specific times, for example to automatically recompile source code after saving a buffer (after-save-hook)
  • Executing arbitrary files, usually to split an overly long configuration file into manageable and homogeneous parts (~/.emacs.d/ and ~/elisp/ are traditional locations for these personal scripts)
• The customize extension allows the user to set configuration properties such as the color scheme interactively, from within Emacs, in a more user-friendly way than by setting variables in .emacs: it offers search, descriptions and help text, multiple choice inputs, reverting to defaults, modification of the running Emacs instance without reloading, and other conveniences similar to the preferences functionality of other programs. The customized values are saved in .emacs (or another designated file) automatically.
• Themes, affecting the choice of fonts and colours, are defined as Emacs Lisp files and chosen through the customize extension.
• Modes, which support editing a range of programming languages (e.g., emacs-lisp-mode, c-mode, java-mode, ESS for R) by changing fonts to highlight the code and keybindings modified (forword-function vs. forward-page). Other modes include ones that support editing spreadsheets (dismal) and structured text.

The first Emacs contained a help library that included documentation for every command, variable and internal function. Because of this, Emacs proponents described the software as self-documenting in that it presents the user with information on its normal features and its current state. Each function includes a documentation string that is displayed to the user on request, a practice that subsequently spread to programming languages including Lisp, Java, Perl, and Python. This help system can take users to the actual code for each function, whether from a built-in library or an added third-party library.

Emacs also has a built-in tutorial. Emacs displays instructions for performing simple editing commands and invoking the tutorial when it is launched with no file to edit. The tutorial is by Stuart Cracraft and Richard Stallman.

The Church of Emacs, formed by Richard Stallman, is a parody religion created for Emacs users.[50] While it refers to vi as the editor of the beast (vi-vi-vi being 6-6-6 in Roman numerals), it does not oppose the use of vi; rather, it calls it proprietary software anathema. ("Using a free version of vi is not a sin but a penance."[51]) The Church of Emacs has its own newsgroup, alt.religion.emacs,[52] that has posts purporting to support this parody religion. Supporters of vi have created an opposing Cult of vi.

Stallman has jokingly referred to himself as St I GNU cius, a saint in the Church of Emacs.[53] This is in reference to Ignatius of Antioch, an early Church father venerated in Christianity.

There is folklore attributing a repetitive strain injury colloquially called Emacs pinky to Emacs' strong dependence on modifier keys,[54] although there have not been any studies done to show Emacs causes more such problems than other keyboard-heavy computer programs.

Users have addressed this through various approaches. Some users recommend simply using the two Control keys on typical PC keyboards like Shift keys while touch typing to avoid overly straining the left pinky, a proper use of the keyboard will reduce the RSI.[55] Software-side methods include:[56]

• Customizing the key layout so that the Ctrl key is transposed with the ⇪ Caps Lock key.[57] Similar techniques include defining the ⇪ Caps Lock key as an additional Control key or transposing the Control and Meta keys. However, as these keys are still often pressed with the same finger, they may still contribute to Emacs pinky.
• Software, such as xwrits or the built-in type-break-mode in Emacs, that reminds the user to take regularly scheduled breaks.
• Using the ErgoEmacs keybindings (with minor mode ergoemacs-mode).[58]
• Customizing the whole keyboard layout to move statistically frequent Emacs keys to more appropriate places.[59]
• Packages such as ace-jump-mode[60] or Emacs Lisp extensions that provide similar functionality of tiered navigation, first asking for a character then replacing occurrences of the character with access keys for cursor movement.
• evil-mode, an advanced Vim emulation layer.
• god-mode, which provides an approach similar to vim's with a mode for entering Emacs commands without modifier keys.
• Using customized key layout offered by Spacemacs and Doom Emacs, projects where space bar key is used as the main key for initiating control sequences. These projects also heavily incorporate both evil-mode and the latter god-mode.[61]
• StickyKeys, which turns key sequences into key combinations.[62]
• Emacs' built-in viper-mode that allows use of the vi key layout for basic text editing and the Emacs scheme for more advanced features.[63]
• Giving a dual role to a more-comfortably accessed key such as the space bar so that it functions as a Control key when pressed in combination with other keys. Ergonomic keyboards or keyboards with a greater number of keys adjacent to the space bar, such as Japanese keyboards, allow thumb control of other modifier keys too like Meta or Shift.[64]
• Using a limited ergonomic subset of keybindings, and accessing other functionality by typing M-x <command-name>. M-x itself can also be rebound.
• Driving Emacs through voice input.

Hardware solutions include special keyboards such as Kinesis's Contoured Keyboard, which places the modifier keys where they can easily be operated by the thumb, or the Microsoft Natural keyboard, whose large modifier keys are placed symmetrically on both sides of the keyboard and can be pressed with the palm of the hand.[54] Foot pedals can also be used.

The Emacs pinky is a relatively recent development. The Space-cadet keyboard on which Emacs was developed had oversized Control keys that were adjacent to the space bar and were easy to reach with the thumb.[65]

The word emacs is sometimes pluralized as emacsen, by phonetic analogy with boxen and VAXen, referring to different varieties of Emacs.[66]