Set up Hugo release flow on CircleCI

This rewrites the release logic to use CircleCI 2.0 and its approve workflow in combination with the state of the release notes to determine what to do next.

Fixes #3779

7 files changed, 139 insertions, 78 deletions

diff --git a/releaser/git.go b/releaser/git.go
index cfef434dd..8d8bbd68d 100644
--- a/releaser/git.go
+++ b/releaser/git.go
@@ -156,8 +156,8 @@ func git(args ...string) (string, error) {
 	return string(out), nil
 }
 
-func getGitInfos(tag, repoPath string, remote bool) (gitInfos, error) {
-	return getGitInfosBefore("HEAD", tag, repoPath, remote)
+func getGitInfos(tag, repo, repoPath string, remote bool) (gitInfos, error) {
+	return getGitInfosBefore("HEAD", tag, repo, repoPath, remote)
 }
 
 type countribCount struct {
@@ -213,8 +213,8 @@ func (g gitInfos) ContribCountPerAuthor() contribCounts {
 	return c
 }
 
-func getGitInfosBefore(ref, tag, repoPath string, remote bool) (gitInfos, error) {
-
+func getGitInfosBefore(ref, tag, repo, repoPath string, remote bool) (gitInfos, error) {
+	client := newGitHubAPI(repo)
 	var g gitInfos
 
 	log, err := gitLogBefore(ref, tag, repoPath)
@@ -234,7 +234,7 @@ func getGitInfosBefore(ref, tag, repoPath string, remote bool) (gitInfos, error)
 			Body:    items[3],
 		}
 		if remote {
-			gc, err := fetchCommit(gi.Hash)
+			gc, err := client.fetchCommit(gi.Hash)
 			if err == nil {
 				gi.GitHubCommit = &gc
 			}
diff --git a/releaser/git_test.go b/releaser/git_test.go
index 8053f7702..f0d6fd24b 100644
--- a/releaser/git_test.go
+++ b/releaser/git_test.go
@@ -14,7 +14,6 @@
 package releaser
 
 import (
-	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -22,7 +21,7 @@ import (
 
 func TestGitInfos(t *testing.T) {
 	skipIfCI(t)
-	infos, err := getGitInfos("v0.20", "", false)
+	infos, err := getGitInfos("v0.20", "hugo", "", false)
 
 	require.NoError(t, err)
 	require.True(t, len(infos) > 0)
@@ -68,7 +67,7 @@ func TestTagExists(t *testing.T) {
 }
 
 func skipIfCI(t *testing.T) {
-	if os.Getenv("CI") != "" {
+	if isCI() {
 		// Travis has an ancient git with no --invert-grep: https://github.com/travis-ci/travis-ci/issues/6328
 		// Also Travis clones very shallowly, making some of the tests above shaky.
 		t.Skip("Skip git test on Linux to make Travis happy.")
diff --git a/releaser/github.go b/releaser/github.go
index c1e7691b8..11f617007 100644
--- a/releaser/github.go
+++ b/releaser/github.go
@@ -6,14 +6,29 @@ import (
 	"io/ioutil"
 	"net/http"
 	"os"
+	"strings"
 )
 
 var (
-	gitHubCommitsApi      = "https://api.github.com/repos/gohugoio/hugo/commits/%s"
-	gitHubRepoApi         = "https://api.github.com/repos/gohugoio/hugo"
-	gitHubContributorsApi = "https://api.github.com/repos/gohugoio/hugo/contributors"
+	gitHubCommitsAPI      = "https://api.github.com/repos/gohugoio/REPO/commits/%s"
+	gitHubRepoAPI         = "https://api.github.com/repos/gohugoio/REPO"
+	gitHubContributorsAPI = "https://api.github.com/repos/gohugoio/REPO/contributors"
 )
 
+type gitHubAPI struct {
+	commitsAPITemplate      string
+	repoAPI                 string
+	contributorsAPITemplate string
+}
+
+func newGitHubAPI(repo string) *gitHubAPI {
+	return &gitHubAPI{
+		commitsAPITemplate:      strings.Replace(gitHubCommitsAPI, "REPO", repo, -1),
+		repoAPI:                 strings.Replace(gitHubRepoAPI, "REPO", repo, -1),
+		contributorsAPITemplate: strings.Replace(gitHubContributorsAPI, "REPO", repo, -1),
+	}
+}
+
 type gitHubCommit struct {
 	Author  gitHubAuthor `json:"author"`
 	HtmlURL string       `json:"html_url"`
@@ -42,10 +57,10 @@ type gitHubContributor struct {
 	Contributions int    `json:"contributions"`
 }
 
-func fetchCommit(ref string) (gitHubCommit, error) {
+func (g *gitHubAPI) fetchCommit(ref string) (gitHubCommit, error) {
 	var commit gitHubCommit
 
-	u := fmt.Sprintf(gitHubCommitsApi, ref)
+	u := fmt.Sprintf(g.commitsAPITemplate, ref)
 
 	req, err := http.NewRequest("GET", u, nil)
 	if err != nil {
@@ -57,10 +72,10 @@ func fetchCommit(ref string) (gitHubCommit, error) {
 	return commit, err
 }
 
-func fetchRepo() (gitHubRepo, error) {
+func (g *gitHubAPI) fetchRepo() (gitHubRepo, error) {
 	var repo gitHubRepo
 
-	req, err := http.NewRequest("GET", gitHubRepoApi, nil)
+	req, err := http.NewRequest("GET", g.repoAPI, nil)
 	if err != nil {
 		return repo, err
 	}
@@ -75,7 +90,7 @@ func fetchRepo() (gitHubRepo, error) {
 	for {
 		page++
 		var currPage []gitHubContributor
-		url := fmt.Sprintf(gitHubContributorsApi+"?page=%d", page)
+		url := fmt.Sprintf(g.contributorsAPITemplate+"?page=%d", page)
 
 		req, err = http.NewRequest("GET", url, nil)
 		if err != nil {
diff --git a/releaser/github_test.go b/releaser/github_test.go
index 7feae75f5..1187cbb2c 100644
--- a/releaser/github_test.go
+++ b/releaser/github_test.go
@@ -23,14 +23,16 @@ import (
 
 func TestGitHubLookupCommit(t *testing.T) {
 	skipIfNoToken(t)
-	commit, err := fetchCommit("793554108763c0984f1a1b1a6ee5744b560d78d0")
+	client := newGitHubAPI("hugo")
+	commit, err := client.fetchCommit("793554108763c0984f1a1b1a6ee5744b560d78d0")
 	require.NoError(t, err)
 	fmt.Println(commit)
 }
 
 func TestFetchRepo(t *testing.T) {
 	skipIfNoToken(t)
-	repo, err := fetchRepo()
+	client := newGitHubAPI("hugo")
+	repo, err := client.fetchRepo()
 	require.NoError(t, err)
 	fmt.Println(">>", len(repo.Contributors))
 }
diff --git a/releaser/releasenotes_writer.go b/releaser/releasenotes_writer.go
index 0c6f297a4..e94ed25e1 100644
--- a/releaser/releasenotes_writer.go
+++ b/releaser/releasenotes_writer.go
@@ -139,9 +139,10 @@ var templateFuncs = template.FuncMap{
 }
 
 func writeReleaseNotes(version string, infosMain, infosDocs gitInfos, to io.Writer) error {
+	client := newGitHubAPI("hugo")
 	changes := gitInfosToChangeLog(infosMain, infosDocs)
 	changes.Version = version
-	repo, err := fetchRepo()
+	repo, err := client.fetchRepo()
 	if err == nil {
 		changes.Repo = &repo
 	}
@@ -190,17 +191,43 @@ func writeReleaseNotesToTmpFile(version string, infosMain, infosDocs gitInfos) (
 	return f.Name(), nil
 }
 
-func getReleaseNotesDocsTempDirAndName(version string) (string, string) {
+func getReleaseNotesDocsTempDirAndName(version string, final bool) (string, string) {
+	if final {
+		return hugoFilepath("temp"), fmt.Sprintf("%s-relnotes-ready.md", version)
+	}
 	return hugoFilepath("temp"), fmt.Sprintf("%s-relnotes.md", version)
 }
 
-func getReleaseNotesDocsTempFilename(version string) string {
-	return filepath.Join(getReleaseNotesDocsTempDirAndName(version))
+func getReleaseNotesDocsTempFilename(version string, final bool) string {
+	return filepath.Join(getReleaseNotesDocsTempDirAndName(version, final))
+}
+
+func (r *ReleaseHandler) releaseNotesState(version string) (releaseNotesState, error) {
+	docsTempPath, name := getReleaseNotesDocsTempDirAndName(version, false)
+	_, err := os.Stat(filepath.Join(docsTempPath, name))
+
+	if err == nil {
+		return releaseNotesCreated, nil
+	}
+
+	docsTempPath, name = getReleaseNotesDocsTempDirAndName(version, true)
+	_, err = os.Stat(filepath.Join(docsTempPath, name))
+
+	if err == nil {
+		return releaseNotesReady, nil
+	}
+
+	if !os.IsNotExist(err) {
+		return releaseNotesNone, err
+	}
+
+	return releaseNotesNone, nil
+
 }
 
 func (r *ReleaseHandler) writeReleaseNotesToTemp(version string, infosMain, infosDocs gitInfos) (string, error) {
 
-	docsTempPath, name := getReleaseNotesDocsTempDirAndName(version)
+	docsTempPath, name := getReleaseNotesDocsTempDirAndName(version, false)
 
 	var (
 		w io.WriteCloser
diff --git a/releaser/releasenotes_writer_test.go b/releaser/releasenotes_writer_test.go
index f3e984d55..f5b7a87d3 100644
--- a/releaser/releasenotes_writer_test.go
+++ b/releaser/releasenotes_writer_test.go
@@ -34,7 +34,7 @@ func _TestReleaseNotesWriter(t *testing.T) {
 	var b bytes.Buffer
 
 	// TODO(bep) consider to query GitHub directly for the gitlog with author info, probably faster.
-	infos, err := getGitInfosBefore("HEAD", "v0.20", "", false)
+	infos, err := getGitInfosBefore("HEAD", "v0.20", "hugo", "", false)
 	require.NoError(t, err)
 
 	require.NoError(t, writeReleaseNotes("0.21", infos, infos, &b))
diff --git a/releaser/releaser.go b/releaser/releaser.go
index d05683033..1271cf179 100644
--- a/releaser/releaser.go
+++ b/releaser/releaser.go
@@ -31,15 +31,18 @@ import (
 
 const commitPrefix = "releaser:"
 
+type releaseNotesState int
+
+const (
+	releaseNotesNone = iota
+	releaseNotesCreated
+	releaseNotesReady
+)
+
 // ReleaseHandler provides functionality to release a new version of Hugo.
 type ReleaseHandler struct {
 	cliVersion string
 
-	// If set, we do the releases in 3 steps:
-	// 1: Create and write a draft release note
-	// 2: Prepare files for new version
-	// 3: Release
-	step        int
 	skipPublish bool
 
 	// Just simulate, no actual changes.
@@ -48,29 +51,14 @@ type ReleaseHandler struct {
 	git func(args ...string) (string, error)
 }
 
-func (r ReleaseHandler) shouldRelease() bool {
-	return r.step < 1 || r.shouldContinue()
-}
-
-func (r ReleaseHandler) shouldContinue() bool {
-	return r.step >= 3
-}
-
-func (r ReleaseHandler) shouldPrepareReleasenotes() bool {
-	return r.step < 1 || r.step == 1
-}
-
-func (r ReleaseHandler) shouldPrepareVersions() bool {
-	return r.step < 1 || r.step == 2 || r.step > 3
-}
-
 func (r ReleaseHandler) calculateVersions() (helpers.HugoVersion, helpers.HugoVersion) {
-
 	newVersion := helpers.MustParseHugoVersion(r.cliVersion)
 	finalVersion := newVersion
 	finalVersion.PatchLevel = 0
 
-	newVersion.Suffix = ""
+	if newVersion.Suffix != "-test" {
+		newVersion.Suffix = ""
+	}
 
 	if newVersion.PatchLevel == 0 {
 		finalVersion = finalVersion.Next()
@@ -82,8 +70,11 @@ func (r ReleaseHandler) calculateVersions() (helpers.HugoVersion, helpers.HugoVe
 }
 
 // New initialises a ReleaseHandler.
-func New(version string, step int, skipPublish, try bool) *ReleaseHandler {
-	rh := &ReleaseHandler{cliVersion: version, step: step, skipPublish: skipPublish, try: try}
+func New(version string, skipPublish, try bool) *ReleaseHandler {
+	// When triggered from CI release branch
+	version = strings.TrimPrefix(version, "release-")
+	version = strings.TrimPrefix(version, "v")
+	rh := &ReleaseHandler{cliVersion: version, skipPublish: skipPublish, try: try}
 
 	if try {
 		rh.git = func(args ...string) (string, error) {
@@ -133,20 +124,38 @@ func (r *ReleaseHandler) Run() error {
 	var (
 		gitCommits     gitInfos
 		gitCommitsDocs gitInfos
+		relNotesState  releaseNotesState
 	)
 
-	if r.shouldPrepareReleasenotes() || r.shouldRelease() {
-		gitCommits, err = getGitInfos(changeLogFromTag, "", !r.try)
+	relNotesState, err = r.releaseNotesState(version)
+	if err != nil {
+		return err
+	}
+
+	prepareRelaseNotes := relNotesState == releaseNotesNone
+	shouldRelease := relNotesState == releaseNotesReady
+
+	defer r.gitPush() // TODO(bep)
+
+	if prepareRelaseNotes || shouldRelease {
+		gitCommits, err = getGitInfos(changeLogFromTag, "hugo", "", !r.try)
 		if err != nil {
 			return err
 		}
-		gitCommitsDocs, err = getGitInfos(changeLogFromTag, "../hugoDocs", !r.try)
+
+		// TODO(bep) explicit tag?
+		gitCommitsDocs, err = getGitInfos("", "hugoDocs", "../hugoDocs", !r.try)
 		if err != nil {
 			return err
 		}
 	}
 
-	if r.shouldPrepareReleasenotes() {
+	if relNotesState == releaseNotesCreated {
+		fmt.Println("Release notes created, but not ready. Reneame to *-ready.md to continue ...")
+		return nil
+	}
+
+	if prepareRelaseNotes {
 		releaseNotesFile, err := r.writeReleaseNotesToTemp(version, gitCommits, gitCommitsDocs)
 		if err != nil {
 			return err
@@ -155,33 +164,30 @@ func (r *ReleaseHandler) Run() error {
 		if _, err := r.git("add", releaseNotesFile); err != nil {
 			return err
 		}
-		if _, err := r.git("commit", "-m", fmt.Sprintf("%s Add release notes draft for %s\n\n[ci skip]", commitPrefix, newVersion)); err != nil {
+		if _, err := r.git("commit", "-m", fmt.Sprintf("%s Add release notes draft for %s\n\nRename to *-ready.md to continue. [ci skip]", commitPrefix, newVersion)); err != nil {
 			return err
 		}
 	}
 
-	if r.shouldPrepareVersions() {
-
-		// For docs, for now we assume that:
-		// The /docs subtree is up to date and ready to go.
-		// The hugoDocs/dev and hugoDocs/master must be merged manually after release.
-		// TODO(bep) improve this when we see how it works.
+	if !shouldRelease {
+		fmt.Printf("Skip release ... ")
+		return nil
+	}
 
-		if err := r.bumpVersions(newVersion); err != nil {
-			return err
-		}
+	// For docs, for now we assume that:
+	// The /docs subtree is up to date and ready to go.
+	// The hugoDocs/dev and hugoDocs/master must be merged manually after release.
+	// TODO(bep) improve this when we see how it works.
 
-		if _, err := r.git("commit", "-a", "-m", fmt.Sprintf("%s Bump versions for release of %s\n\n[ci skip]", commitPrefix, newVersion)); err != nil {
-			return err
-		}
+	if err := r.bumpVersions(newVersion); err != nil {
+		return err
 	}
 
-	if !r.shouldRelease() {
-		fmt.Printf("Skip release ... Use --state=%d for next or --state=4 to finish\n", r.step+1)
-		return nil
+	if _, err := r.git("commit", "-a", "-m", fmt.Sprintf("%s Bump versions for release of %s\n\n[ci skip]", commitPrefix, newVersion)); err != nil {
+		return err
 	}
 
-	releaseNotesFile := getReleaseNotesDocsTempFilename(version)
+	releaseNotesFile := getReleaseNotesDocsTempFilename(version, true)
 
 	// Write the release notes to the docs site as well.
 	docFile, err := r.writeReleaseNotesToDocs(version, releaseNotesFile)
@@ -196,12 +202,14 @@ func (r *ReleaseHandler) Run() error {
 		return err
 	}
 
-	if _, err := r.git("tag", "-a", tag, "-m", fmt.Sprintf("%s %s [ci deploy]", commitPrefix, newVersion)); err != nil {
+	if _, err := r.git("tag", "-a", tag, "-m", fmt.Sprintf("%s %s [ci skip]", commitPrefix, newVersion)); err != nil {
 		return err
 	}
 
-	if _, err := r.git("push", "origin", tag); err != nil {
-		return err
+	if !r.skipPublish {
+		if _, err := r.git("push", "origin", tag); err != nil {
+			return err
+		}
 	}
 
 	if err := r.release(releaseNotesFile); err != nil {
@@ -226,6 +234,15 @@ func (r *ReleaseHandler) Run() error {
 	return nil
 }
 
+func (r *ReleaseHandler) gitPush() {
+	if r.skipPublish {
+		return
+	}
+	if _, err := r.git("push", "origin", "HEAD"); err != nil {
+		log.Fatal("push failed:", err)
+	}
+}
+
 func (r *ReleaseHandler) release(releaseNotesFile string) error {
 	if r.try {
 		fmt.Println("Skip goreleaser...")
@@ -243,19 +260,16 @@ func (r *ReleaseHandler) release(releaseNotesFile string) error {
 }
 
 func (r *ReleaseHandler) bumpVersions(ver helpers.HugoVersion) error {
-	fromDev := ""
 	toDev := ""
 
 	if ver.Suffix != "" {
-		toDev = "-DEV"
-	} else {
-		fromDev = "-DEV"
+		toDev = ver.Suffix
 	}
 
 	if err := r.replaceInFile("helpers/hugo.go",
 		`Number:(\s{4,})(.*),`, fmt.Sprintf(`Number:${1}%.2f,`, ver.Number),
 		`PatchLevel:(\s*)(.*),`, fmt.Sprintf(`PatchLevel:${1}%d,`, ver.PatchLevel),
-		fmt.Sprintf(`Suffix:(\s{4,})"%s",`, fromDev), fmt.Sprintf(`Suffix:${1}"%s",`, toDev)); err != nil {
+		`Suffix:(\s{4,})".*",`, fmt.Sprintf(`Suffix:${1}"%s",`, toDev)); err != nil {
 		return err
 	}
 
@@ -325,3 +339,7 @@ func hugoFilepath(filename string) string {
 	}
 	return filepath.Join(pwd, filename)
 }
+
+func isCI() bool {
+	return os.Getenv("CI") != ""
+}