// Package cli is the simplexcalc command tree: the run and version
// commands, and the exit status the program ends with.
package cli

import (
	"fmt"

	"github.com/spf13/cobra"
)

// appname is the name the program reports in its logs and its version.
const appname = "simplexcalc"

// Main runs the command named on the command line and returns the exit
// status for main to pass to os.Exit.
//
// It leaves cobra's output streams at their defaults. cobra writes the
// usage and an unknown help topic to stderr, but SetOut moves them onto
// the stream it is given.
func Main(version string) int {
	return execute(rootCmd(version))
}

// execute runs root and returns the exit status. It takes the command
// so that a test can set its arguments and output streams first.
func execute(root *cobra.Command) int {
	err := root.Execute()
	if err != nil {
		// cobra has already printed the error; this only sets the exit
		// status, which is what a supervisor and a shell script read.
		_, _ = fmt.Fprintln(root.ErrOrStderr(), "exiting: "+err.Error())

		return 1
	}

	return 0
}