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The '''DEC Text Processing Utility''' (or '''DECTPU''')<ref>[https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c04623115 Guide to the DEC Text Processing Utility]</ref><ref>{{Cite web |url=https://h41379.www4.hpe.com/doc/73final/6020/6020pro.html |title=DEC Text Processing Utility Reference Manual |access-date=2018-05-09 |archive-url=https://web.archive.org/web/20180510115210/https://h41379.www4.hpe.com/doc/73final/6020/6020pro.html |archive-date=2018-05-10 |url-status=dead }}</ref> is a dedicated programming language developed by [[Digital Equipment Corporation]] (DEC) to easily create multi-functional [[text editor]]s.

TPU is part of [[OpenVMS]]. It can be used on a terminal, a console, or on a graphical system like [[DECwindows]].

== Functionality ==
TPU provides text buffer management APIs in concert with window management APIs which are targeted for the [[VT100]] line of terminals.{{citation needed|date=January 2020}} This allowed split-screen windows with scrolling and hence multiple views of the same buffer content.{{citation needed|date=January 2020}} There are also key mapping APIs provided, allowing a wide range of functionality for editing text. The keyboard mapping could be easily adapted by the admin or the user.{{citation needed|date=January 2020}}

Users could write their own specific editor, to e.g. translate text or short (error) messages to multiple natural languages in a synchronised small text window. The text editor is callable, so you could have small text editors built into specific applications, e.g. a simple mail client. You might redirect output from applications into a text window, using [[inter-process communication]]. Therefore one could call web services to return their results into a text buffer.

== Implementations ==

* [[EVE (text editor)|EVE]] (Extensible Versatile Editor), the first TPU-based editor, delivered with VAX/VMS by mid-1985.<ref>{{cite book |title=User's Guide to EVE AA-Z302A-TE |date=July 1985 |publisher=[[Digital Equipment Corporation]] |page=ix}}</ref>
* In 1986, DEC developed a new version of [[EDT (Digital)|EDT]] written in TPU
* [[Language-Sensitive Editor]], part of VAXset (software development platform)
* A version of the [[Vi (text editor)|vi]] editor was created by Gregg Wonderly at [[Oklahoma State University]] called TPUVI or VITPU.<ref>{{cite newsgroup |url=https://www.tuhs.org/Usenet/comp.sources.misc/1988-September/001841.html |title=v04i092: TPUVI for VMS part 1 of 17 |newsgroup=comp.sources.misc |date=September 26, 1988 |author=Gregg Wonderly }}</ref> VITPU is still available via the [[DECUS]] archives online.<ref>{{cite web |url=https://www.digiater.nl/openvms/freeware/v50/vitpu/doc/vi_1.rno |title=VI.RNO - Installation and help for VI emulation in TPU |author=Gregg Wonderly |date=July 22, 1987 |publisher=OpenVMS Freeware CD V5.0 |accessdate=July 1, 2022}}</ref>

==References==
{{Reflist}}

[[Category:Text-oriented programming languages]]
[[Category:OpenVMS software]]

{{Compu-lang-stub}}

DEC Text Processing Utility - Revision history

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