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The Hessling Editor (THE) editor is one of the oldest open source editor projects and for the last decade it was written and maintained by Mark Hessling, who along with being the original author of THE is also a maintainer of Regina, an open source Rexx interpreter that has been ported to most Unix platforms.

THE is a text editor modeled on the VM/CMS editor XEDIT, plus adding the best features of Mansfield Software's Kedit. It represents a special class of editors called "orthodox editors" with a unique blend of programmability and folding capabilities.

The most interesting feature of the orthodox editors family is the "all" command to display and work on only those lines in a file that contain a given string. For example, the command: all /string/ will display only the lines that include "string"; any global changes you make on this slice (for example replace string command) will be reflected in the file. (In most cases this is a more convenient way to make global changes in the file.) In order to restore visibility of all lines you need to enter: all (without a target string).

THE is available for many operating systems: most or all POSIX Unix platforms (as a program for text-mode or native X Windows 11); QNX, OS/2, DOS, BeOS, Amiga, Windows 95/98/Me/NT/2000/XP.

Like other members of orthodox text editor family, THE uses IBMs REXX as its macro language, which makes THE highly configurable and versatile. This provides the ability to create powerful extensions to the editor and/or customize it to specialized needs. For example, you could create edit commands that would allow you to manipulate columns of text (e.g. copy/move or insert/delete a column of text within a file). With REXX, you can also integrate OS commands or external functions into an edit session. Since version 3.0, THE also has user-configurable syntax highlighting.

THE is freeware, open source, distributed under the GNU General Public License.

• THE: The Hessling Editor
• Orthodox Editors as a Special Class of Advanced Editors Discusses Xedit and THE as Xedit derivative as a special class of programmable editors with an emphasis of folding capabilities and programmability.
• Supporting stuff for The Hessling Editor

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