Quick and dirty hack CLI for goimagehash library. https://github.com/corona10/goimagehash

goimagehash_cli.go

package main

import (
	"github.com/corona10/goimagehash"

	"fmt"
	"image"
	_ "image/jpeg"
	_ "image/png"
	"os"
	"strconv"
)

func showUsage() {
	fmt.Println("goimagehash [ahash|phash|dhash] image1 (image2)")
}

func cp(e error) {
	if e != nil {
		panic(e)
	}
}

func main() {
	if len(os.Args) >= 3 {

		var f2 *os.File = nil
		var i2 image.Image = nil

		var ih1 *goimagehash.ImageHash = nil
		var ih2 *goimagehash.ImageHash = nil

		f1, err := os.Open(os.Args[2])
		cp(err)

		if len(os.Args) >= 4 {
			f2, err = os.Open(os.Args[3])
			cp(err)
		}

		i1, _, err := image.Decode(f1)
		cp(err)

		if f2 != nil {
			i2, _, err = image.Decode(f2)
			cp(err)
		}

		if os.Args[1] == "ahash" {
			ih1, _ = goimagehash.AverageHash(i1)

			if i2 != nil {
				ih2, _ = goimagehash.AverageHash(i2)
			}
		} else if os.Args[1] == "phash" {
			ih1, _ = goimagehash.DifferenceHash(i1)

			if i2 != nil {
				ih2, _ = goimagehash.DifferenceHash(i2)
			}
		} else if os.Args[1] == "dhash" {
			ih1, _ = goimagehash.PerceptionHash(i1)

			if i2 != nil {
				ih2, _ = goimagehash.PerceptionHash(i2)
			}
		} else {
			showUsage()
            return
		}

		fmt.Println("Image hash for " + os.Args[2] + " is " + strconv.FormatUint(ih1.GetHash(), 10))

		if ih2 != nil {
			fmt.Println("Image hash for " + os.Args[3] + " is " + strconv.FormatUint(ih2.GetHash(), 10))
			d, _ := ih1.Distance(ih2)

			fmt.Println("Distance is " + strconv.FormatInt(int64(d), 10))
		}

	} else {
		showUsage()
	}
}