Hemlock is a free Emacs

text editor A text editor is a type of computer program that edits plain text. Such programs are sometimes known as "notepad" software (e.g. Windows Notepad). Text editors are provided with operating systems and software development packages, and can be ...

for most

POSIX The Portable Operating System Interface (POSIX) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. POSIX defines both the system- and user-level application programming inter ...

-compliant

Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and ot ...

systems. It follows the tradition of the

Lisp Machine Lisp machines are general-purpose computers designed to efficiently run Lisp as their main software and programming language, usually via hardware support. They are an example of a high-level language computer architecture, and in a sense, they ...

editor

ZWEI Zwei (German: "two") may refer to: * Zwei (band), a Japanese duo band * ZWEI, a text editor * '' Zwei: The Arges Adventure'', 2001 video game * '' Zwei: The Ilvard Insurrection'', 2008 video game * Zwei, a team in ''Infinite Ryvius'' anime serie ...

and the ITS/

TOPS-20 The TOPS-20 operating system by Digital Equipment Corporation (DEC) is a proprietary OS used on some of DEC's 36-bit mainframe computers. The Hardware Reference Manual was described as for "DECsystem-10/DECSYSTEM-20 Processor" (meaning the DEC PDP- ...

implementation of Emacs, but differs from

XEmacs XEmacs is a graphical- and console-based text editor which runs on almost any Unix-like operating system as well as Microsoft Windows. XEmacs is a fork, based on a version of GNU Emacs from the late 1980s. Any user can download, use, and modify X ...

GNU Emacs GNU Emacs is a free software text editor. It was created by GNU Project founder Richard Stallman, based on the Emacs editor developed for Unix operating systems. GNU Emacs has been a central component of the GNU project and a flagship project of ...

, the most popular Emacs variants, in that it is written in

Common Lisp Common Lisp (CL) is a dialect of the Lisp programming language, published in ANSI standard document ''ANSI INCITS 226-1994 (S20018)'' (formerly ''X3.226-1994 (R1999)''). The Common Lisp HyperSpec, a hyperlinked HTML version, has been derived fro ...

rather than

Emacs Lisp Emacs Lisp is a dialect of the Lisp programming language used as a scripting language by Emacs (a text editor family most commonly associated with GNU Emacs and XEmacs). It is used for implementing most of the editing functionality built into Em ...

and C—although it borrows features from the later editors. Hemlock was originally written by the CMU Spice project in

Spice Lisp Spice Lisp (Scientific Personal Integrated Computing Environment) is a programming language, a dialect of Lisp. Its implementation, originally written by Carnegie Mellon University's (CMU) Spice Lisp Group, targeted the microcode of the 16-bit w ...

(later renamed to

CMU Common Lisp CMUCL is a free Common Lisp implementation, originally developed at Carnegie Mellon University. CMUCL runs on most Unix-like platforms, including Linux and BSD; there is an experimental Windows port as well. Steel Bank Common Lisp is derive ...

) for the

PERQ The PERQ, also referred to as the Three Rivers PERQ or ICL PERQ, was a pioneering workstation computer produced in the late 1970s through the early 1980s. In June 1979, the company took its very first order from the UK's Rutherford Appleton La ...

computer. Hemlock is integrated with the Common Lisp compiler, interpreter, and development suite

, though it is possible to use it as a standalone editor, or to use

with CMUCL instead—Hemlock integrates better, but has fewer features and addon programs. One distinctive feature is that Hemlock distinguishes Lisp function names from interactive command names, which are given in a more natural-language-like style derived from the original MIT Lisp Machine editor

Zmacs Zmacs is one of the many variants of the Emacs text editor. Zmacs was written for the MIT Lisp machine and runs on its descendants (Symbolics Genera, LMI Lambda, TI Explorer). Zmacs is written in Lisp Machine Lisp (called ZetaLisp on Symbolic ...

and TECO Emacs. It is able to display to a

terminal Terminal may refer to: Computing Hardware * Terminal (electronics), a device for joining electrical circuits together * Terminal (telecommunication), a device communicating over a line * Computer terminal, a set of primary input and output dev ...

, or use the CLX (Common Lisp X Library) for

X11 The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like operating systems. X provides the basic framework for a GUI environment: drawing and moving windows on the display device and interacting wi ...

. Other variants of Hemlock: *

Clozure CL Clozure CL (CCL) is a Common Lisp implementation. It implements the full ANSI Common Lisp standard with several extensions (CLOS MOP, threads, CLOS conditions, CLOS streams, ...). It contains a command line development environment, an experimenta ...

's Macintosh integrated development environment has an editor, which is based on Hemlock code and uses Apple's Cocoa for display. * The editor of

LispWorks LispWorks is computer software, a proprietary implementation and integrated development environment (IDE) for the programming language Common Lisp. LispWorks was developed by the UK software company Harlequin Ltd., and first published in 1989. Ha ...

is based on an early version of Hemlock. This version is portable and runs on Windows, Mac OS X, X11/Motif and Gtk+. The editor not only runs in LispWorks, but also in Liquid Common Lisp. * Lucid Common Lisp provided an editor called Helix, which was based on Hemlock. * Portable Hemlock is a variant of Hemlock running on multiple versions of Common Lisp.Portable Hemlock
/ref>

References

External links

*
"Hemlock User's Manual", Bill Chiles, Robert A. MacLachlan, February 1992
-( ps file)
Entry
on

CLiki CLiki is an open source wiki application written in Common Lisp, that was under development from 2002 to 2005. CLiki was first presented at the International Lisp Conference 2002. CLiki was the first wiki variant to introduce so called "free lin ...

Portable Hemlock project
*
The original "Portable Hemlock" homepageQuickdocs Hemlock API
{{Common Lisp Emacs Free text editors Common Lisp (programming language) software Public-domain software with source code