cmd/httptap/cmd/version.go

package cmd

import (
	"fmt"
	"runtime"
	"runtime/debug"

	"github.com/spf13/cobra"
)

// These are overridden at link time by goreleaser.
var (
	version = "dev"
	commit  = "none"
	date    = "unknown"
)

func newVersionCmd() *cobra.Command {
	short := &cobra.Command{
		Use:   "version",
		Short: "Print the version and exit",
		Run: func(c *cobra.Command, args []string) {
			fmt.Println(versionString())
		},
	}
	short.Flags().Bool("verbose", false, "show Go runtime and build info")
	short.RunE = func(c *cobra.Command, args []string) error {
		if v, _ := c.Flags().GetBool("verbose"); v {
			fmt.Println(verboseVersion())
			return nil
		}
		fmt.Println(versionString())
		return nil
	}
	return short
}

func versionString() string {
	return fmt.Sprintf("httptap %s (%s) built %s", version, commit, date)
}

func verboseVersion() string {
	bi, _ := debug.ReadBuildInfo()
	out := versionString() + "\n"
	out += fmt.Sprintf("  go:      %s\n  os/arch: %s/%s\n",
		runtime.Version(), runtime.GOOS, runtime.GOARCH)
	if bi != nil {
		out += fmt.Sprintf("  module:  %s\n", bi.Path)
	}
	return out
}