main.go

package main

import (
	"bytes"
	"context"
	_ "embed"
	"fmt"
	"io/ioutil"
	"net/url"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"time"

	"github.com/felixdorn/release-that/globals"
	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing"
	"github.com/google/go-github/v40/github"
	"github.com/mitchellh/go-homedir"
	"github.com/spf13/cobra"
)

//go:embed _config.json
var defaultConfig []byte
var start time.Time

type options struct {
	initialize bool
	login      bool

	overwriteConfig bool

	noAnsi bool

	patch         bool
	minor         bool
	major         bool
	customVersion string
	dryRun        bool
	skipHooks     string
	quiet         bool
	selfUpdate    bool
	version       bool
}

var opts = &options{}

var Repository *git.Repository

func main() {
	cli := cobra.Command{
		Use:   "rt",
		Short: "Automated release system for GitHub",
		RunE: func(cmd *cobra.Command, args []string) error {
			if opts.version {
				fmt.Println("Rt", globals.Version)
				return nil
			}

			if opts.initialize {
				_, err := os.Stat("rt.json")

				if err == nil && !opts.overwriteConfig {
					return fmt.Errorf("a config file already exists! You can overwrite it with `--force`")
				}

				err = os.WriteFile("rt.json", defaultConfig, 0777)
				check(err)

				fmt.Printf("%sSuccessfully created a new %s`rt.json`%s config file. %s\n", Green.Fg(), White.Fg(), Stop+Green.Fg(), Stop)

				return nil
			}

			if opts.login {
				fmt.Printf("%sThe token you're about to enter will be stored in %s~/.rtauth%s.%s\n", Gray.Fg(), White.Fg(), Gray.Fg(), Stop)
				fmt.Printf("%sYour can paste your token safely as it will be hidden immediately.%s\n\n", Gray.Fg(), Stop)
				token := password("Personal access token")

				home, err := homedir.Dir()
				check(err)

				err = os.WriteFile(home+"/.rtauth", token, 0600)
				check(err)

				fmt.Printf("\n\n%sYour token has been saved.%s\n", Green.Fg(), Stop)

				return nil
			}

			if opts.selfUpdate {
				// get the latest release from GitHub
				release, _, err := GithubClient.Repositories.GetLatestRelease(context.Background(), "felixdorn", "release-that")
				check(err)

				if len(release.Assets) == 0 {
					return fmt.Errorf("no assets found for this release, can't update")
				}

				asset, _, err := GithubClient.Repositories.DownloadReleaseAsset(context.Background(), "felixdorn", "release-that", *release.Assets[0].ID, GithubClient.Client())
				check(err)

				body, err := ioutil.ReadAll(asset)
				check(err)

				executable, err := os.Executable()
				check(err)

				err = os.WriteFile(executable+".tmp", body, 0777)
				check(err)

				// rename the rt.tmp to rt
				err = os.Rename(executable+".tmp", executable)
				check(err)

				// chmod rt to 0777
				err = os.Chmod(executable, 0777)
				check(err)

				fmt.Printf("%sSuccessfully updated to version %s%s.%s\n", Green.Fg(), White.Fg(), *release.TagName, Stop)
				return nil
			}

			if !opts.patch && !opts.minor && !opts.major && opts.customVersion == "" {
				return fmt.Errorf("one of the following flags is required --patch, --minor, --major, --custom")
			}

			return execute()
		},
	}

	cli.Flags().BoolVarP(&opts.initialize, "init", "i", false, "Create a new configuration file")
	cli.Flags().BoolVarP(&opts.overwriteConfig, "force", "f", false, "Overwrite an existing config file")
	cli.Flags().BoolVarP(&opts.patch, "patch", "p", false, "Increment by a patch version")
	cli.Flags().BoolVarP(&opts.minor, "minor", "m", false, "Increment by a minor version")
	cli.Flags().BoolVarP(&opts.major, "major", "M", false, "Increment by a major version")
	cli.Flags().StringVar(&opts.customVersion, "custom", "", "Set a new custom version")
	cli.Flags().BoolVar(&opts.login, "login", false, "Login to GitHub")
	cli.Flags().BoolVarP(&opts.noAnsi, "no-ansi", "Q", false, "Disable ANSI colors")
	cli.Flags().BoolVarP(&opts.dryRun, "dry-run", "D", false, "Run without making any changes")
	cli.Flags().StringVar(&opts.skipHooks, "skip-hooks", "no", "Skip one or many hooks separated by a comma")
	cli.Flags().BoolVarP(&opts.quiet, "quiet", "q", false, "Reduced output")
	cli.Flags().BoolVarP(&opts.selfUpdate, "self-update", "u", false, "Update rt to the latest version")
	cli.Flags().BoolVarP(&opts.version, "version", "v", false, "Print the version")
	cli.SilenceErrors = true
	cli.SilenceUsage = true
	err := cli.Execute()
	check(err)
}

func init() {
	start = time.Now()

	_, err := os.Stat(".git")

	if os.IsNotExist(err) {
		check(
			fmt.Errorf("the current directory is not a git repository"),
		)
	}

	wd, _ := os.Getwd()

	repository, err := git.PlainOpen(wd)
	check(err)

	Repository = repository

	_, err = Repository.Head()
	if err != nil {
		fmt.Printf("%sCan not get the repository HEAD. Do you have any commits?%s\n", Yellow.Fg(), Stop)
		check(err)
	}
}

func execute() error {
	remote, err := Repository.Remote(Config.Remote)
	check(err)

	current, nextVersion := getNextVersion()
	releaseNotes := buildReleaseNotes(current)
	owner, project := findOwnerAndProjectName(remote.Config().URLs[0])

	// get current commit
	commit, err := Repository.Head()
	check(err)

	if !shouldSkipHook("before_release") {
		for _, hook := range Config.BeforeRelease {
			err = exec.Command("sh", "-c", hook.Resolve(map[string]string{
				"version":    nextVersion,
				"tag":        nextVersion,
				"commit":     commit.Hash().String()[:7],
				"fullCommit": commit.Hash().String(),
			})).Run()

			check(err)
		}
	}

	name := Config.ReleaseNotes.Title.Resolve(map[string]string{
		"version": nextVersion,
		"tag":     nextVersion,
	})

	if !opts.dryRun {
		release, _, err := GithubClient.Repositories.CreateRelease(context.Background(), owner, project, &github.RepositoryRelease{
			Name:    &name,
			TagName: &nextVersion,
			Body:    &releaseNotes,
		})
		check(err)

		for _, asset := range Config.Assets {
			file, err := os.Open(asset)
			check(err)

			_, _, err = GithubClient.Repositories.UploadReleaseAsset(context.Background(), owner, project, *release.ID, &github.UploadOptions{
				Name: filepath.Base(asset),
			}, file)
			check(err)
		}
	}

	if !shouldSkipHook("after_release") {
		for _, hook := range Config.AfterRelease {
			err = exec.Command("sh", "-c", hook.Resolve(map[string]string{
				"version":    nextVersion,
				"tag":        nextVersion,
				"commit":     commit.Hash().String()[:7],
				"fullCommit": commit.Hash().String(),
			})).Run()
			check(err)
		}
	}

	if !opts.quiet {
		fmt.Printf("Release %s\n\n", nextVersion)
		fmt.Print(releaseNotes)
		if len(releaseNotes) > 0 {
			fmt.Println()
		}

		fmt.Print("* Run `git fetch` to retrieve the new tag created only on the remote.\n")
		fmt.Printf("\nReleased in %.2fs\n", (float64(time.Now().UnixNano())-float64(start.UnixNano()))/1000_000_000.0)
	} else {
		fmt.Print(nextVersion)
	}

	return nil
}

func getNextVersion() (*plumbing.Reference, string) {
	tag := getLatestTag()

	var current *Version

	if tag == nil {
		current = MustParse("0.0.0")
	} else {
		nv, err := NewVersion(tag.Name().Short())
		check(err)
		current = nv
	}

	if opts.patch {
		return tag, current.IncPatch().String()
	} else if opts.minor {
		return tag, current.IncMinor().String()
	} else if opts.major {
		return tag, current.IncMajor().String()
	}

	next, err := NewVersion(opts.customVersion)
	check(err)
	return tag, next.String()
}

func getLatestTag() *plumbing.Reference {
	tags, err := Repository.Tags()
	check(err)

	var tag *plumbing.Reference

	for {
		nextTag, _ := tags.Next()

		if nextTag == nil {
			break
		}

		tag = nextTag
	}

	return tag
}

func findOwnerAndProjectName(remoteUrl string) (string, string) {
	if strings.HasPrefix(remoteUrl, "git") {
		op := strings.Split(
			remoteUrl[15:],
			"/",
		)

		return op[0], strings.TrimSuffix(op[1], ".git")
	}

	u, err := url.Parse(remoteUrl)
	check(err)

	path := strings.Split(u.Path, "/")

	return path[0], strings.TrimSuffix(path[1], path[1])
}

func buildReleaseNotes(latestTag *plumbing.Reference) string {
	if latestTag == nil {
		return "Initial release.\n"
	}

	var buffer bytes.Buffer

	out, err := exec.Command("git", "log", "--pretty=%H", latestTag.Name().Short()+"..HEAD").CombinedOutput()
	check(err)
	for _, c := range strings.Split(string(out), "\n") {
		if c == "" {
			continue
		}

		commit, err := Repository.CommitObject(plumbing.NewHash(c))
		check(err)

		messageLines := strings.Split(commit.Message, "\n")

		var message string

		if len(messageLines) == 0 {
			continue
		}

		message = messageLines[0]

		if len(messageLines) > 2 {
			message += "..."
		}

		_, _ = fmt.Fprintf(&buffer, strings.TrimSpace(Config.ReleaseNotes.CommitFormat.Resolve(map[string]string{
			"hash":         c[:7],
			"longHash":     c,
			"message":      message,
			"author.name":  commit.Author.Name,
			"author.email": commit.Author.Email,
		}))+"\n")
	}

	return buffer.String()
}

func shouldSkipHook(hook string) bool {
	if opts.skipHooks == "no" {
		return false
	}

	if opts.skipHooks == "" {
		return true
	}

	return strings.Contains(opts.skipHooks, hook)
}