mobile-shell/mosh

Cursor Color and Style changes

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#352 opened on Nov 22, 2012

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Terminal emulationfeaturegood first issue

Description

MinTTY allows to change cursor styles and colors but mosh ignores them. This would be useful for vim (different insert and normal mode cursors)

Mode-dependent cursor in vim: CSI Ps SP q

Example: echo -ne '\e]12;#00FF00\a' # green cursor http://code.google.com/p/mintty/wiki/Tips#Mode-dependent_cursor_in_vim

Changing colors: OSC Ps ; Pt ST OSC Ps ; Pt BEL

Example: echo -ne "\e[2 q" # non blinking block cursor http://code.google.com/p/mintty/wiki/Tips#Changing_colours

Xterm Control Sequences taken from http://invisible-island.net/xterm/ctlseqs/ctlseqs.txt

Contributor guide

Tech stack
cpp
Domain
cli
Issue type
feature
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
Basic understanding of C++Knowledge of terminal escape sequencesFamiliarity with Mosh's codebase structure
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Examine Mosh's terminal emulator implementation in the src/terminal directory. Focus on how escape sequences are currently parsed (likely in a file like terminal/terminalemulator.cc). Add parsing for CSI Ps SP q to change cursor style and OSC sequences (Ps;Pt ST/BEL) to change cursor color. Ensure the cursor state is stored and communicated to the frontend. Look at existing handling of other OSC sequences for guidance. Test by running vim with appropriate terminal settings.