Stern is a Go CLI tool that tails multiple pods and containers on Kubernetes, with color-coded output, regex-based filtering, and customizable Go templates. It relies on the Kubernetes client-go library to watch pod events and stream logs from matching containers. The architecture is a single binary with a Cobra command tree, where the core logic in the `stern/` package handles target filtering (by pod name, container name, container state, condition), log line parsing (timestamp extraction, include/exclude/highlight regex), and template rendering. The code is well-structured, thoroughly tested, and follows modern Go patterns. It supports advanced features like interactive prompts, shell completion (bash/zsh/fish), config files, and various output formats. While most components are tightly integrated for this specific use case, several sub-packages (color management, condition matching, container state matching, log filtering utilities) are cleanly isolated and could be reused in other Kubernetes or CLI projects.
ov is a feature-rich terminal pager written in Go, designed as a modern replacement for less/more. It supports large files via chunked reading with memory limits, ANSI escape sequence rendering, column alignment, word wrapping, search (case-insensitive, regex), follow/watch modes, multiple documents, sidebar panels (help, marks, doc list, sections, styles), mouse support, and extensive keybinding customization. The architecture is a single binary with a core `oviewer` package handling document management, screen drawing, event processing, and input modes. It uses `tcell` for terminal UI, `cobra` for CLI, `viper` for configuration, and supports compressed files (gzip, bzip2, zstd, lz4, xz). The codebase is well-tested with over 100 test files and demonstrates solid engineering practices including reusable patterns for bidirectional maps, ordered maps, converters, and input handling.