Nvi

Nvi

nvi (new vi) is a re-implementation of the classic Berkeley text editor, ex/vi, traditionally distributed with BSD, and later, Unix systems. It was originally distributed as part of the Fourth Berkeley Software Distribution (4BSD).

Due to licensing disputes between AT&T and the Computer Systems Research Group (CSRG) at the University of California, Berkeley (see USL v. BSDi), the CSRG was required to the replace Unix-derived portions of BSD source with new and unencumbered code. "nvi" was one of many components to be re-written despite the fact that the original vi was from UC Berkeley. AT&T had a legal claim over the license. "nvi" turned out to be a major improvement over the classical vi as discussed below.

Features

Usually referred to as a "vi-clone", "nvi" contains a number of features not present in the original program. These include:
*8-bit clean data, lines and files limited by available memory
*Multiple edit buffers
*Colon command-line editing and path name completion
*Tag stacks
*Cscope support
*Extended Regular Expressions
*Infinite undo
*Horizontal scrolling
*Message catalogs (Dutch, English, French, German, Russian, Spanish, Swedish)
*Preliminary support for Perl and Tcl/Tk scripting languages

Features that are not present in version 1.79 (which are in the original program) include:
* lisp mode
* modelines
* open mode

Credits and distribution

"nvi" was written by Keith Bostic, and currently seems to be frozen at version "1.79". It is the default vi on all BSD systems (NetBSD, OpenBSD, and FreeBSD).

"Sven Verdoolaege" added support for Unicode in 2000. He also has been developing a GTK+ front-end for nvi, but this effort seems to have stalled. The aspects of "nvi" that are still marked preliminary or unimplemented are, for the time being, likely to remain that way.

BSD projects continue to use version "1.79" due to licensing differences between Berkeley Database "1.85" and the later versions by Sleepycat Software. "nvi" is unusual because it uses a database to store the text as it is being edited. "Sven Verdoolaege"'s changes after version "1.79" use locking features not available in the "1.85" database.

There are also reportedly changes to nvi after "1.79" which make nvi less vi-compatibleFact|date=August 2007.

Due to the liberal policy of the BSD license, "nvi" can vary subtly across the BSDs. It was originally derived from the first incarnation of elvis, written by Steve Kirkendall.

As with the original vi, "nvi" is only executable on POSIX/Unix platforms due to its reliance on the curses/ncurses library.

A multilingual version is available as nvi-m17n by Jun-ichiro itojun Hagino. [cite web|url=http://www.suse.de/~mfabian/suse-cjk/nvi-m17n.html|title=(CJK) Support in SuSE Linux|author=Mike Fabian] [cite web|url=http://www.usenix.org/events/usenix99/full_papers/hagino/hagino.ps|title=Multilingual vi clones: past, now and the future|author=Jun-ichiro itojun Hagino and Yoshitaka Tokugawa]

References

See also

*vim
*elvis

External links

* [http://www.bostic.com/vi/ The Berkeley Vi Editor Home Page]
* [http://www.openbsd.org/cgi-bin/man.cgi?query=vi the (n)vi man page] via OpenBSD
* [http://www.kotnet.org/~skimo/nvi/ The latest development releases of nvi]


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