termux/termux-app

Weird rendering when using specific shell theme and then recalling command history with long commands

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#1860 opened on Dec 26, 2020

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help wanted

Description

Problem description

When recalling command history, if encountered long commands, the rendering behaves weird.

Shell: fish 3.1.2 Using oh-my-fish with bobthefish theme

Ascinema recording that contains the problematic sequences Screen recording of asciinema replaying the above cast in Termux

Steps to reproduce

  1. pkg install fish
  2. Install oh-my-fish.
  3. Use omf theme bobthefish to switch theme.
  4. Type a long enough command that exceeds the maximum width and wraps.
  5. Press up to recall and observe weird behaviors, for example, characters disappearing, or the whole line moving backwards for one character.

Expected behavior

Termux should render just like how the above asciinema recording renders on the website.

Additional information

  • Termux application version: 0.103
  • Android OS version: 10 (LineageOS 17.1)
  • Device model: Sony Xperia XZ1

Contributor guide

Tech stack
javaandroid
Domain
mobilecli
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JavaAndroid developmentTerminal emulation concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the rendering logic in the Termux terminal emulator, particularly how command history is displayed when commands wrap. Look at files such as TerminalView.java or EmulatorView.java for text rendering. Reproduce the issue with fish shell and bobthefish theme as described in the issue. Check if the issue is related to prompt rendering or line wrapping. Consider testing with different terminal widths and long commands.