proposal for name vs. ID lookup priority

idmatch.go

package main

import (
	"fmt"
	"flag"
	"regexp"
)

var (
	fullID = regexp.MustCompile(`^[0-9a-fA-F]{64}$`)
	hexID  = regexp.MustCompile(`^[0-9a-fA-F]{1,64}$`)
)

func main() {
	flag.Parse()
	args := flag.Args()

	if len(args) < 1 {
		fmt.Println("need an ID/name argument")
		return
	}

	id := args[0]

	//easiest case: argument is a full ID
	if (fullID.MatchString(id)) {
		fmt.Println("CHECK BY ID: full 64-digit hex identifier provided")
		//do we even want to check a name if the ID lookup fails? what's the probability?
	} else {
		//not a full ID; check if it is a shortened ID
		if (hexID.MatchString(id)) {
			fmt.Println("ID matches hex pattern < 64 chars long - could be shortened ID")
			// but check names first for exact match ("db" case)
			fmt.Println("CHECK NAME - does it exist?  then return exact name match")
			fmt.Println("NOW CHECK ID - if error return, check not specific enough?")
			//any reason to consider: what if name and ID lookup both return a container/image?
		} else {
			fmt.Println("CHECK NAME ONLY: not 64 len and not even hex")
		}
	}
}