$ show symfony/console
Symfony Console is a mature, feature-rich PHP library for building command-line interfaces. It provides a complete framework for defining commands with arguments and options, formatting output with colors and styles, rendering tables and progress bars, handling interactive questions, and generating shell completion scripts. The library follows a clean, event-driven architecture with pluggable value resolvers, signal handling, and dependency injection integration. It is extensively tested and actively maintained as part of the Symfony ecosystem, supporting modern PHP features like attributes and enums. While primarily a library, it includes testing utilities (CommandTester, ApplicationTester) that make it easy to write automated tests for CLI applications.
The LLM identified 7 files worth highlighting for reuse:
A standalone, highly configurable table renderer for terminal output. Supports multiple built-in styles (default, markdown, borderless, box, box-double), custom styles via TableStyle, column spanning, row spanning, cell formatting with colors, and multi-byte string handling. The rendering logic is self-contained and could be extracted into any PHP CLI project with minimal adaptation.
A feature-rich progress bar implementation supporting multiple simultaneous bars, sections, custom placeholders, throttling, pause/resume, and OSC 9;4 taskbar progress escape codes. It integrates with ConsoleSectionOutput for advanced terminal layouts. The core logic is reusable and demonstrates careful handling of terminal redraws and performance.
A tag-based output formatter that parses style tags (e.g., <info>, <error>, <fg=red>) and applies ANSI escape codes. Supports nested tags, escaping, and word wrapping with width awareness. The tag parsing and style application logic is isolated and could be reused in any PHP project needing terminal formatting.
Implements a chain-of-responsibility pattern for resolving command arguments from input to typed PHP values. Pluggable value resolvers (e.g., BackedEnumValueResolver, DateTimeValueResolver, ServiceValueResolver) are prioritized and can be targeted via attributes. This pattern is cleanly abstracted and reusable for any CLI framework needing automatic argument conversion.
A testing harness for console commands that simulates input streams, captures output, and provides assertions on exit codes and display. Supports both legacy execute() and new run() with ExecutionResult. The pattern of wrapping a command with a test driver is reusable for any CLI testing framework.
A signal registry that manages POSIX signal handlers with a push/pop stack pattern, allowing multiple handlers per signal and clean restoration. Integrates with the console event system for signal events. The signal management logic is self-contained and demonstrates careful handling of signal safety and handler isolation.
Generates bash shell completion scripts from a CompletionOutput interface. Produces valid bash code with proper escaping and handling of command names, options, and arguments. The pattern of generating shell-specific completion scripts from a common interface is reusable for any CLI tool needing shell completion.