emoji-talk/docker-ex/main.go

package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"io"
	"os"
	"os/exec"
	"strings"

	"github.com/emojisum/emojisum/emoji"
)

var (
	flJson       = flag.Bool("json", false, "output json (no emoji)")
	formatOutput = `
{
	"repo": "{{.Repository}}",
	"id": "{{.ID}}",
	"digest": "{{.Digest}}",
	"tag": "{{.Tag}}",
	"createdSince": "{{.CreatedSince}}",
	"createdAt": "{{.CreatedAt}}",
	"size": "{{.Size}}"
}
`
)

func main() {
	flag.Parse()
	args := []string{"images", "--digests", fmt.Sprintf("--format=%s", formatOutput)}
	args = append(args, flag.Args()...)
	cmd := exec.Command("docker", args...)

	if !*flJson {
		pR, pW := io.Pipe()
		cmd.Stdout = pW
		jR := json.NewDecoder(pR)
		go func() {
			for {
				it := ImageThing{}
				err := jR.Decode(&it)
				if err != nil {
					fmt.Fprintln(os.Stderr, err)
					os.Exit(1)
				}
				var digest, d, h string
				var name string

				if it.Tag == "" {
					name = it.Repo
				} else {
					name = fmt.Sprintf("%s:%s", it.Repo, it.Tag)
				}

				if strings.Contains(it.Digest, ":") {
					chunks := strings.SplitN(it.Digest, ":", 2)
					h = chunks[0]
					d, err = emoji.FromHexString(chunks[1])
					if err != nil {
						fmt.Fprintln(os.Stderr, err)
						os.Exit(1)
					}
					digest = fmt.Sprintf("%s:%s", h, d)
				} else {
					digest = "<none>"
				}

				fmt.Printf("%s (id %s) %s\n", name, it.ID, digest)
			}
		}()
	} else {
		cmd.Stdout = os.Stdout
	}

	cmd.Stdin = os.Stdin
	cmd.Stderr = os.Stderr
	cmd.Run()
}

type ImageThing struct {
	Repo        string
	ID          string
	Digest      string
	Tag         string
	CreateSince string
	CreateAt    string
	Size        string
}