Sam (text editor)

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Sam
Original author(s)Rob Pike
Developer(s)Bell Labs
Initial releaseearly 1980s
Written inC
Operating systemUnix, Plan 9, Win32
Available inEnglish
TypeText editor
License2021: MIT
2014: GPL-2.0-only
2002: LPL-1.02
Websitesam.cat-v.org

Sam is a multi-file

modular Unix aesthetic. It is internally simple, its power leveraged by the composability of a small command language and extensibility
through shell integration.

Design and features

Sam is designed as two synchronous programs: a command interpreter and a mouse-oriented bitmap windowing interface. The interpreter's command set is modeled after the UNIX editor

ed and may be used to operate the editor from a standard text terminal. By default, however, Sam presents its own graphical user interface
(GUI) window, samterm, which additionally allows point-and-click operations through pop-up context menus. This two-process structure allowed sam to access files on networked host systems through remote execution of the file-access process while running the windowing interface locally, thereby bypassing latency over slow connections.

Samterm presents windows to files being edited and to a persistent command window which accepts input as sam commands. Most common editing operations are quickly and naturally accomplished with the point-and-click interface, which also functions inside the command window. This latter fact allows commands to be edited (and resubmitted) just as any other text, a function inherited from the DMD 5620 terminal interface.

Command syntax

Sam's command syntax is formally similar to ed's or

ed, vi, AWK, Perl
, etc. This is implemented through a model called structural regular expressions, which can recursively apply regular-expression matching to obtain other (sub)selections within a given selection. In this way, sam's command set can be applied to substrings that are identified by arbitrarily complex context.

Sam extends its basic text-editing command set to handling of multiple files, providing similar pattern-based conditional and loop commands for filename specification. Any sequence of text-editing commands may be applied as a unit to each such specification.

Infinite undos

Sam was one of the first text editors to support "infinite" undo to revert any number of editing errors. This feature, combined with Sam's facility to easily edit its own commands and, fundamentally, its small, orthogonal command set (containing only 33 commands), represent the program's bias toward a low learning threshold over other more expressive "power editors."

Endorsers

Sam is the preferred text editor of several eminent programmers. It was the first full screen editor

Ken Thompson liked.[1] Sam is the text editor used by Bjarne Stroustrup,[2] Brian Kernighan,[3][4] Douglas McIlroy and Tom Duff.[citation needed] Others, like Dennis Ritchie, Rob Pike and Russ Cox, have transitioned to acme, an editor with the same command language as sam, but with an assortment of additional features, including mouse chording
and automatic tiling of opened files.

The latest version of sam was written as part of the Plan 9 operating system, but there are Microsoft Windows, macOS and X Window System[5] ports available.

See also

Notes

  1. ^ Interview:Rob Pike Responds, Posted by Roblimo on Monday October 18, 2004, Slashdot
  2. ^ Rzeszótko, Jarosław (2006-10-16). "Stiff asks, great programmers answer". Stifflog (Interview). Archived from the original on October 5, 2011. Retrieved 2008-11-01.
  3. ^ Kernighan, Brian (July 2000). "An Interview with Brian Kernighan" (Interview). Interviewed by Budiu, Mihai. Retrieved 2008-11-01.
  4. ^ Fridman, Lex (19 July 2020). Brian Kernighan's Programming Setup | Lex Fridman. YouTube. Event occurs at 44 seconds. Archived from the original on 2021-12-12. Retrieved 2020-10-03.
  5. ^ "Deadpixi/Sam". GitHub. 17 May 2022.

References

External links

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