xtermjs/xterm.js

Support DECBKM to remap backspace <-> delete

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#3,041 opened on Aug 14, 2020

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 (6 comments) (0 reactions) (0 assignees)TypeScript (1,574 forks)batch import
good first issuehelp wantedtype/enhancement

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Description

DECBKM to remap Backspace, Escape and Delete to their respective codes is not working at all. Quickly looking through code DECBKM is set to reset by default according to...

https://vt100.net/docs/vt510-rm/DECBKM.html

DEL issues an ESC keycode 27... which I now realise is not issuing the keycode but an ANSI sequence ESC issues keycode 27 Backspace issues keycode 127

This is troubling when you are trying to isolate what key is actually being pressed. And other odd behaviour when trying to parse things.

Code Sample

https://repl.it/@KelvinVerhey/decbkm-issue

Details

  • Chrome/Firefox/IE
  • Windows 10 Pro
  • xterm.js version: dunno... whatever repl.it is using

Question

https://stackoverflow.com/questions/63405913/xterm-js-decbkm-support-for-del-and-backspace

Contributor guide

Research direction
Investigate how DECBKM (Backarrow Key Mode) is currently implemented in xterm.js. Look at the escape sequence handler for DECBKM and trace how it affects key mapping for Backspace, Delete, and Escape. Check the relevant source files (likely src/input/Keyboard.ts or similar) and test the behavior with an xterm.js demo.
Tech stack
typescriptjavascript
Domain
frontend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaScriptTypeScriptTerminal emulation concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70