domain-cli
Rust CLI design constraints and patterns for argument parsing, configuration layering, and user feedback.
- Type-safe argument parsing with clap derive macros; supports subcommands, help text, and environment variable integration
- Configuration precedence rule: CLI args override environment variables, which override config files and defaults
- Proper error handling with stderr/stdout separation, non-zero exit codes, and Result-based error propagation
- Progress bars, colored output, and interactive prompts via indicatif, colored, and dialoguer for user feedback during long operations
CLI Domain
Layer 3: Domain Constraints
Domain Constraints → Design Implications
| Domain Rule | Design Constraint | Rust Implication |
|---|---|---|
| User ergonomics | Clear help, errors | clap derive macros |
| Config precedence | CLI > env > file | Layered config loading |
| Exit codes | Non-zero on error | Proper Result handling |
| Stdout/stderr | Data vs errors | eprintln! for errors |
| Interruptible | Handle Ctrl+C | Signal handling |
Critical Constraints
User Communication
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