nix-amer/args.go

package main

import (
	"flag"
	"fmt"
	"git.xdrm.io/go/nix-amer/internal/instruction"
)

// GetArgs manages cli arguments to build executionContext,
// extract the buildfile path and return whether to dry-run/execute
// + adds error information
func GetArgs() (*instruction.ExecutionContext, string, bool, error) {
	setupFlags(flag.CommandLine)

	longPack := flag.String("package", "", "")
	dryRun := flag.Bool("dry-run", false, "")
	longServ := flag.String("service", "", "")
	pack := flag.String("p", "", "")
	serv := flag.String("s", "", "")
	flag.Parse()

	// 1. fail on missing build file
	if len(flag.Args()) < 1 {
		return nil, "", false, fmt.Errorf("missing buildfile")
	}
	buildfile := flag.Arg(0)

	// 2. override short version with long
	if len(*longPack) > 0 {
		pack = longPack
	}
	if len(*longServ) > 0 {
		serv = longServ
	}

	// 3. fail on missing mandatory fields
	if len(*pack) < 1 {
		return nil, "", false, fmt.Errorf("missing -package")
	}
	// if serv == nil || len(*serv) < 1 { // default service
	// 	return nil, "", fmt.Errorf("missing -service")
	// }

	// 3. Load context
	ctx, err := instruction.CreateContext(*pack, *serv)
	if err != nil {
		return nil, "", false, err
	}
	/*DEBUG*/ //fmt.Printf("package: '%s' | '%s'\n", fpackage, lpackage)
	/*DEBUG*/ //fmt.Printf("service: '%s' | '%s'\n", fservice, lservice)

	return ctx, buildfile, *dryRun, nil
}

func setupFlags(f *flag.FlagSet) {
	f.Usage = func() {
		help()
	}
}