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

import (
	"fmt"
	"io"
	"os"
)

// 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.
func Main(version string) int {
	return execute(version, os.Args[1:], os.Stdout, os.Stderr)
}

// execute is Main with the arguments and the output passed in, so that
// a test can supply them.
func execute(version string, args []string, stdout, stderr io.Writer) int {
	root := rootCmd(version)
	root.SetArgs(args)
	root.SetOut(stdout)
	root.SetErr(stderr)

	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(stderr, "exiting: "+err.Error())

		return 1
	}

	return 0
}