tabline.wez is a WezTerm plugin that provides a customizable tab bar interface written in Lua. It displays information about tabs, windows, and system status (mode, workspace, battery, CPU, RAM, datetime, domain, etc.) in a configurable layout inspired by lualine.nvim. The architecture is modular with separate components for configuration management, status line rendering, tab formatting, utility functions, and individual information components. Key entry points are in plugin/init.lua which sets up WezTerm event handlers for 'update-status' and 'format-tab-title'. The plugin pulls data from the WezTerm API and system sources to dynamically update the display based on user activity and system status.
Xonsh is a cross-platform, Python-powered interactive shell that combines Python syntax with shell subprocess commands. The codebase implements a full shell environment with a custom parser (PLY-based with version-specific extensions), an execution engine that compiles xonsh code to Python AST, a rich tab-completion system with multiple backends (bash, git, pip, python, custom completers), a pluggable history backend (JSON, SQLite), a prompt system with git status and virtualenv information, and a subprocess management layer with job control. It also includes CLI tools for formatting, linting, and interactive configuration (xonfig wizard and web UI). The architecture is monolithic with a clear module structure: parsers, executers, completers, prompts, history, procs, and shells. External dependencies include prompt_toolkit, pygments, and PLY (vendored). The repository is actively maintained with frequent releases, supports Python 3.10+, and has an extensive test suite. Some technical drift exists due to deprecated API shims, multiple parser versions, and LLM-generated tests, but the core is well-engineered.