version

Overview ¶

Package version contains routines to parse Debian package version numbers.

Example:

package main

import (
	"fmt"
	"os"

	"maze.io/dpkg.v1/version"
)

func main() {
	if len(os.Args) != 3 {
		fmt.Fprintf(os.Stderr, "%s a b\n", os.Args[0])
		os.Exit(1)
	}
	var a, b version.Version
	var err error
	if a, err = version.New(os.Args[1]); err != nil {
		fmt.Fprintf(os.Stderr, "%s: %v\n", os.Args[1], err)
		os.Exit(1)
	}
	if b, err = version.New(os.Args[2]); err != nil {
		fmt.Fprintf(os.Stderr, "%s: %v\n", os.Args[2], err)
		os.Exit(1)
	}

	r := version.Compare(a, b)
	switch {
	case r < 0:
		fmt.Printf("%s is older than %s", a, b)
	case r > 0:
		fmt.Printf("%s is more recent than %s", a, b)
	default:
		fmt.Println("versions are equal")
	}
}