golang-cli

To structure a Go CLI with Cobra, you build consistent command trees and initialize Viper in `PersistentPreRunE` to handle configuration layering. This ensures proper flag binding, stdout/stderr separation, and predictable behavior under automation.

Viper configuration precedence in a Go CLI is managed by layering flags, environment variables, and config files. Applying this layering ensures correct overrides while safely handling missing config files without breaking command execution.

Graceful cancellation in a Go command-line tool is handled using `signal.NotifyContext`. This mechanism intercepts interruption signals, allowing your Cobra commands to clean up resources and exit gracefully during operational automation.

Stdout and stderr separation in Unix CLI tools ensures logs go to stderr while results go to stdout, preventing pipeline corruption. It is tested by executing commands programmatically and capturing output using Cobra's output writers for deterministic assertions.

You can inject version information into a Go CLI during the build process using `ldflags`. This approach passes version variables at compilation time, ensuring your command-line tool reports accurate versioning natively.

Yes, this approach supports adding shell completion to an existing Cobra-based CLI. It provides guidance for implementing robust flag binding, argument validators, and shell completion setup to extend your current command structure.