cc-switch-cli/internal/cli/cli.go

// Package cli wires cobra subcommands onto the config/provider/runner/templates
// layers. Each subcommand file (add.go, list.go, use.go, ...) exposes a
// factory function that receives a shared *appState carrying the effective
// config path, loaded config, output streams, and a verbose flag.
//
// Tests drive this package by calling Execute with an argv slice and inspecting
// the (exitCode, err) result plus the stdout/stderr io.Writers they pass via
// ExecuteWithStreams.
package cli

import (
	"io"
	"os"
)

// Execute runs the CLI against os.Stdin/Stdout/Stderr using argv.
func Execute(argv []string) (int, error) {
	return ExecuteWithStreams(argv, os.Stdin, os.Stdout, os.Stderr)
}

// ExecuteWithStreams is the testable form of Execute; callers supply the
// standard streams explicitly. The function returns the exit code cc-switch
// should terminate with. A non-nil error is already printed to stderr by cobra
// (or by the subcommand) before return, so main() need not print it again.
func ExecuteWithStreams(argv []string, stdin io.Reader, stdout, stderr io.Writer) (int, error) {
	app := &appState{
		stdin:  stdin,
		stdout: stdout,
		stderr: stderr,
	}
	root := newRootCmd(app)
	root.SetArgs(argv)
	root.SetIn(stdin)
	root.SetOut(stdout)
	root.SetErr(stderr)

	err := root.Execute()
	return app.exitCode(err), err
}