Add Hugo Modules

This commit implements Hugo Modules.

This is a broad subject, but some keywords include:

* A new `module` configuration section where you can import almost anything. You can configure both your own file mounts nd the file mounts of the modules you import. This is the new recommended way of configuring what you earlier put in `configDir`, `staticDir` etc. And it also allows you to mount folders in non-Hugo-projects, e.g. the `SCSS` folder in the Bootstrap GitHub project.
* A module consists of a set of mounts to the standard 7 component types in Hugo: `static`, `content`, `layouts`, `data`, `assets`, `i18n`, and `archetypes`. Yes, Theme Components can now include content, which should be very useful, especially in bigger multilingual projects.
* Modules not in your local file cache will be downloaded automatically and even "hot replaced" while the server is running.
* Hugo Modules supports and encourages semver versioned modules, and uses the minimal version selection algorithm to resolve versions.
* A new set of CLI commands are provided to manage all of this: `hugo mod init`,  `hugo mod get`,  `hugo mod graph`,  `hugo mod tidy`, and  `hugo mod vendor`.

All of the above is backed by Go Modules.

Fixes #5973
Fixes #5996
Fixes #6010
Fixes #5911
Fixes #5940
Fixes #6074
Fixes #6082
Fixes #6092

1 files changed, 201 insertions, 67 deletions

diff --git a/hugolib/testhelpers_test.go b/hugolib/testhelpers_test.go
index 8c72e10d0..ac511367d 100644
--- a/hugolib/testhelpers_test.go
+++ b/hugolib/testhelpers_test.go
@@ -2,13 +2,17 @@ package hugolib
 
 import (
 	"io"
-	"io/ioutil"
 	"path/filepath"
 	"runtime"
 	"strconv"
 	"testing"
 	"unicode/utf8"
 
+	"github.com/gohugoio/hugo/parser/metadecoders"
+
+	"github.com/gohugoio/hugo/parser"
+	"github.com/pkg/errors"
+
 	"bytes"
 	"fmt"
 	"regexp"
@@ -39,9 +43,12 @@ import (
 )
 
 type sitesBuilder struct {
-	Cfg config.Provider
-	Fs  *hugofs.Fs
-	T   testing.TB
+	Cfg     config.Provider
+	environ []string
+
+	Fs      *hugofs.Fs
+	T       testing.TB
+	depsCfg deps.DepsCfg
 
 	*require.Assertions
 
@@ -60,13 +67,16 @@ type sitesBuilder struct {
 	theme string
 
 	// Default toml
-	configFormat string
+	configFormat  string
+	configFileSet bool
+	viperSet      bool
 
 	// Default is empty.
 	// TODO(bep) revisit this and consider always setting it to something.
 	// Consider this in relation to using the BaseFs.PublishFs to all publishing.
 	workingDir string
 
+	addNothing bool
 	// Base data/content
 	contentFilePairs  []string
 	templateFilePairs []string
@@ -94,18 +104,22 @@ func newTestSitesBuilder(t testing.TB) *sitesBuilder {
 	return &sitesBuilder{T: t, Assertions: require.New(t), Fs: fs, configFormat: "toml", dumper: litterOptions}
 }
 
-func createTempDir(prefix string) (string, func(), error) {
-	workDir, err := ioutil.TempDir("", prefix)
-	if err != nil {
-		return "", nil, err
-	}
+func newTestSitesBuilderFromDepsCfg(t testing.TB, d deps.DepsCfg) *sitesBuilder {
+	assert := require.New(t)
 
-	if runtime.GOOS == "darwin" && !strings.HasPrefix(workDir, "/private") {
-		// To get the entry folder in line with the rest. This its a little bit
-		// mysterious, but so be it.
-		workDir = "/private" + workDir
+	litterOptions := litter.Options{
+		HidePrivateFields: true,
+		StripPackageNames: true,
+		Separator:         " ",
 	}
-	return workDir, func() { os.RemoveAll(workDir) }, nil
+
+	b := &sitesBuilder{T: t, Assertions: assert, depsCfg: d, Fs: d.Fs, dumper: litterOptions}
+	workingDir := d.Cfg.GetString("workingDir")
+
+	b.WithWorkingDir(workingDir)
+
+	return b.WithViper(d.Cfg.(*viper.Viper))
+
 }
 
 func (s *sitesBuilder) Running() *sitesBuilder {
@@ -113,17 +127,31 @@ func (s *sitesBuilder) Running() *sitesBuilder {
 	return s
 }
 
+func (s *sitesBuilder) WithNothingAdded() *sitesBuilder {
+	s.addNothing = true
+	return s
+}
+
 func (s *sitesBuilder) WithLogger(logger *loggers.Logger) *sitesBuilder {
 	s.logger = logger
 	return s
 }
 
 func (s *sitesBuilder) WithWorkingDir(dir string) *sitesBuilder {
-	s.workingDir = dir
+	s.workingDir = filepath.FromSlash(dir)
+	return s
+}
+
+func (s *sitesBuilder) WithEnviron(env ...string) *sitesBuilder {
+	for i := 0; i < len(env); i += 2 {
+		s.environ = append(s.environ, fmt.Sprintf("%s=%s", env[i], env[i+1]))
+	}
 	return s
 }
 
 func (s *sitesBuilder) WithConfigTemplate(data interface{}, format, configTemplate string) *sitesBuilder {
+	s.T.Helper()
+
 	if format == "" {
 		format = "toml"
 	}
@@ -138,32 +166,59 @@ func (s *sitesBuilder) WithConfigTemplate(data interface{}, format, configTempla
 }
 
 func (s *sitesBuilder) WithViper(v *viper.Viper) *sitesBuilder {
-	loadDefaultSettingsFor(v)
-	s.Cfg = v
+	s.T.Helper()
+	if s.configFileSet {
+		s.T.Fatal("WithViper: use Viper or config.toml, not both")
+	}
+	defer func() {
+		s.viperSet = true
+	}()
 
-	return s
+	// Write to a config file to make sure the tests follow the same code path.
+	var buff bytes.Buffer
+	m := v.AllSettings()
+	s.Assertions.NoError(parser.InterfaceToConfig(m, metadecoders.TOML, &buff))
+	return s.WithConfigFile("toml", buff.String())
 }
 
 func (s *sitesBuilder) WithConfigFile(format, conf string) *sitesBuilder {
-	writeSource(s.T, s.Fs, "config."+format, conf)
+	s.T.Helper()
+	if s.viperSet {
+		s.T.Fatal("WithConfigFile: use Viper or config.toml, not both")
+	}
+	s.configFileSet = true
+	filename := s.absFilename("config." + format)
+	writeSource(s.T, s.Fs, filename, conf)
 	s.configFormat = format
 	return s
 }
 
 func (s *sitesBuilder) WithThemeConfigFile(format, conf string) *sitesBuilder {
+	s.T.Helper()
 	if s.theme == "" {
 		s.theme = "test-theme"
 	}
 	filename := filepath.Join("themes", s.theme, "config."+format)
-	writeSource(s.T, s.Fs, filename, conf)
+	writeSource(s.T, s.Fs, s.absFilename(filename), conf)
 	return s
 }
 
-func (s *sitesBuilder) WithSourceFile(filename, content string) *sitesBuilder {
-	writeSource(s.T, s.Fs, filepath.FromSlash(filename), content)
+func (s *sitesBuilder) WithSourceFile(filenameContent ...string) *sitesBuilder {
+	s.T.Helper()
+	for i := 0; i < len(filenameContent); i += 2 {
+		writeSource(s.T, s.Fs, s.absFilename(filenameContent[i]), filenameContent[i+1])
+	}
 	return s
 }
 
+func (s *sitesBuilder) absFilename(filename string) string {
+	filename = filepath.FromSlash(filename)
+	if s.workingDir != "" && !strings.HasPrefix(filename, s.workingDir) {
+		filename = filepath.Join(s.workingDir, filename)
+	}
+	return filename
+}
+
 const commonConfigSections = `
 
 [services]
@@ -191,10 +246,12 @@ privacyEnhanced = true
 `
 
 func (s *sitesBuilder) WithSimpleConfigFile() *sitesBuilder {
+	s.T.Helper()
 	return s.WithSimpleConfigFileAndBaseURL("http://example.com/")
 }
 
 func (s *sitesBuilder) WithSimpleConfigFileAndBaseURL(baseURL string) *sitesBuilder {
+	s.T.Helper()
 	config := fmt.Sprintf("baseURL = %q", baseURL)
 
 	config = config + commonConfigSections
@@ -323,7 +380,7 @@ func (s *sitesBuilder) EditFiles(filenameContent ...string) *sitesBuilder {
 	for i := 0; i < len(filenameContent); i += 2 {
 		filename, content := filepath.FromSlash(filenameContent[i]), filenameContent[i+1]
 		changedFiles = append(changedFiles, filename)
-		writeSource(s.T, s.Fs, filename, content)
+		writeSource(s.T, s.Fs, s.absFilename(filename), content)
 
 	}
 	s.changedFiles = changedFiles
@@ -354,6 +411,7 @@ func (s *sitesBuilder) writeFilePairs(folder string, filenameContent []string) *
 
 func (s *sitesBuilder) CreateSites() *sitesBuilder {
 	if err := s.CreateSitesE(); err != nil {
+		herrors.PrintStackTrace(err)
 		s.Fatalf("Failed to create sites: %s", err)
 	}
 
@@ -361,34 +419,72 @@ func (s *sitesBuilder) CreateSites() *sitesBuilder {
 }
 
 func (s *sitesBuilder) LoadConfig() error {
-	cfg, _, err := LoadConfig(ConfigSourceDescriptor{Fs: s.Fs.Source, Filename: "config." + s.configFormat})
+	if !s.configFileSet {
+		s.WithSimpleConfigFile()
+	}
+
+	cfg, _, err := LoadConfig(ConfigSourceDescriptor{
+		WorkingDir: s.workingDir,
+		Fs:         s.Fs.Source,
+		Logger:     s.logger,
+		Environ:    s.environ,
+		Filename:   "config." + s.configFormat}, func(cfg config.Provider) error {
+
+		return nil
+	})
+
 	if err != nil {
 		return err
 	}
+
 	s.Cfg = cfg
+
 	return nil
 }
 
 func (s *sitesBuilder) CreateSitesE() error {
-	s.addDefaults()
-	s.writeFilePairs("content", s.contentFilePairs)
-	s.writeFilePairs("content", s.contentFilePairsAdded)
-	s.writeFilePairs("layouts", s.templateFilePairs)
-	s.writeFilePairs("layouts", s.templateFilePairsAdded)
-	s.writeFilePairs("data", s.dataFilePairs)
-	s.writeFilePairs("data", s.dataFilePairsAdded)
-	s.writeFilePairs("i18n", s.i18nFilePairs)
-	s.writeFilePairs("i18n", s.i18nFilePairsAdded)
-
-	if s.Cfg == nil {
-		if err := s.LoadConfig(); err != nil {
-			return err
+	if !s.addNothing {
+		if _, ok := s.Fs.Source.(*afero.OsFs); ok {
+			for _, dir := range []string{
+				"content/sect",
+				"layouts/_default",
+				"layouts/partials",
+				"layouts/shortcodes",
+				"data",
+				"i18n",
+			} {
+				if err := os.MkdirAll(filepath.Join(s.workingDir, dir), 0777); err != nil {
+					return errors.Wrapf(err, "failed to create %q", dir)
+				}
+			}
 		}
+
+		s.addDefaults()
+		s.writeFilePairs("content", s.contentFilePairsAdded)
+		s.writeFilePairs("layouts", s.templateFilePairsAdded)
+		s.writeFilePairs("data", s.dataFilePairsAdded)
+		s.writeFilePairs("i18n", s.i18nFilePairsAdded)
+
+		s.writeFilePairs("i18n", s.i18nFilePairs)
+		s.writeFilePairs("data", s.dataFilePairs)
+		s.writeFilePairs("content", s.contentFilePairs)
+		s.writeFilePairs("layouts", s.templateFilePairs)
+
 	}
 
-	sites, err := NewHugoSites(deps.DepsCfg{Fs: s.Fs, Cfg: s.Cfg, Logger: s.logger, Running: s.running})
+	if err := s.LoadConfig(); err != nil {
+		return errors.Wrap(err, "failed to load config")
+	}
+
+	depsCfg := s.depsCfg
+	depsCfg.Fs = s.Fs
+	depsCfg.Cfg = s.Cfg
+	depsCfg.Logger = s.logger
+	depsCfg.Running = s.running
+
+	sites, err := NewHugoSites(depsCfg)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "failed to create sites")
 	}
 	s.H = sites
 
@@ -404,10 +500,12 @@ func (s *sitesBuilder) BuildE(cfg BuildCfg) error {
 }
 
 func (s *sitesBuilder) Build(cfg BuildCfg) *sitesBuilder {
+	s.T.Helper()
 	return s.build(cfg, false)
 }
 
 func (s *sitesBuilder) BuildFail(cfg BuildCfg) *sitesBuilder {
+	s.T.Helper()
 	return s.build(cfg, true)
 }
 
@@ -528,14 +626,8 @@ hello:
 }
 
 func (s *sitesBuilder) Fatalf(format string, args ...interface{}) {
-	Fatalf(s.T, format, args...)
-}
-
-func Fatalf(t testing.TB, format string, args ...interface{}) {
-	trace := stackTrace()
-	format = format + "\n%s"
-	args = append(args, trace)
-	t.Fatalf(format, args...)
+	s.T.Helper()
+	s.T.Fatalf(format, args...)
 }
 
 func stackTrace() string {
@@ -543,9 +635,10 @@ func stackTrace() string {
 }
 
 func (s *sitesBuilder) AssertFileContentFn(filename string, f func(s string) bool) {
+	s.T.Helper()
 	content := s.FileContent(filename)
 	if !f(content) {
-		s.Fatalf("Assert failed for %q", filename)
+		s.Fatalf("Assert failed for %q in content\n%s", filename, content)
 	}
 }
 
@@ -554,6 +647,7 @@ func (s *sitesBuilder) AssertHome(matches ...string) {
 }
 
 func (s *sitesBuilder) AssertFileContent(filename string, matches ...string) {
+	s.T.Helper()
 	content := s.FileContent(filename)
 	for _, match := range matches {
 		if !strings.Contains(content, match) {
@@ -563,10 +657,16 @@ func (s *sitesBuilder) AssertFileContent(filename string, matches ...string) {
 }
 
 func (s *sitesBuilder) FileContent(filename string) string {
+	s.T.Helper()
+	filename = filepath.FromSlash(filename)
+	if !strings.HasPrefix(filename, s.workingDir) {
+		filename = filepath.Join(s.workingDir, filename)
+	}
 	return readDestination(s.T, s.Fs, filename)
 }
 
 func (s *sitesBuilder) AssertObject(expected string, object interface{}) {
+	s.T.Helper()
 	got := s.dumper.Sdump(object)
 	expected = strings.TrimSpace(expected)
 
@@ -633,17 +733,41 @@ func (th testHelper) replaceDefaultContentLanguageValue(value string) string {
 	return value
 }
 
-func newTestCfg() (*viper.Viper, *hugofs.Fs) {
+func loadTestConfig(fs afero.Fs, withConfig ...func(cfg config.Provider) error) (*viper.Viper, error) {
+	v, _, err := LoadConfig(ConfigSourceDescriptor{Fs: fs}, withConfig...)
+	return v, err
+}
 
+func newTestCfgBasic() (*viper.Viper, *hugofs.Fs) {
+	mm := afero.NewMemMapFs()
 	v := viper.New()
-	fs := hugofs.NewMem(v)
+	v.Set("defaultContentLanguageInSubdir", true)
 
-	v.SetFs(fs.Source)
+	fs := hugofs.NewFrom(hugofs.NewBaseFileDecorator(mm), v)
 
-	loadDefaultSettingsFor(v)
+	return v, fs
 
-	// Default is false, but true is easier to use as default in tests
-	v.Set("defaultContentLanguageInSubdir", true)
+}
+
+func newTestCfg(withConfig ...func(cfg config.Provider) error) (*viper.Viper, *hugofs.Fs) {
+	mm := afero.NewMemMapFs()
+
+	v, err := loadTestConfig(mm, func(cfg config.Provider) error {
+		// Default is false, but true is easier to use as default in tests
+		cfg.Set("defaultContentLanguageInSubdir", true)
+
+		for _, w := range withConfig {
+			w(cfg)
+		}
+
+		return nil
+	})
+
+	if err != nil && err != ErrNoConfigFile {
+		panic(err)
+	}
+
+	fs := hugofs.NewFrom(hugofs.NewBaseFileDecorator(mm), v)
 
 	return v, fs
 
@@ -651,9 +775,10 @@ func newTestCfg() (*viper.Viper, *hugofs.Fs) {
 
 func newTestSitesFromConfig(t testing.TB, afs afero.Fs, tomlConfig string, layoutPathContentPairs ...string) (testHelper, *HugoSites) {
 	if len(layoutPathContentPairs)%2 != 0 {
-		Fatalf(t, "Layouts must be provided in pairs")
+		t.Fatalf("Layouts must be provided in pairs")
 	}
 
+	writeToFs(t, afs, filepath.Join("content", ".gitkeep"), "")
 	writeToFs(t, afs, "config.toml", tomlConfig)
 
 	cfg, err := LoadConfigDefault(afs)
@@ -673,14 +798,6 @@ func newTestSitesFromConfig(t testing.TB, afs afero.Fs, tomlConfig string, layou
 	return th, h
 }
 
-func newTestSitesFromConfigWithDefaultTemplates(t testing.TB, tomlConfig string) (testHelper, *HugoSites) {
-	return newTestSitesFromConfig(t, afero.NewMemMapFs(), tomlConfig,
-		"layouts/_default/single.html", "Single|{{ .Title }}|{{ .Content }}",
-		"layouts/_default/list.html", "List|{{ .Title }}|{{ .Content }}",
-		"layouts/_default/terms.html", "Terms List|{{ .Title }}|{{ .Content }}",
-	)
-}
-
 func createWithTemplateFromNameValues(additionalTemplates ...string) func(templ tpl.TemplateHandler) error {
 
 	return func(templ tpl.TemplateHandler) error {
@@ -694,12 +811,16 @@ func createWithTemplateFromNameValues(additionalTemplates ...string) func(templ
 	}
 }
 
+// TODO(bep) replace these with the builder
 func buildSingleSite(t testing.TB, depsCfg deps.DepsCfg, buildCfg BuildCfg) *Site {
 	return buildSingleSiteExpected(t, false, false, depsCfg, buildCfg)
 }
 
 func buildSingleSiteExpected(t testing.TB, expectSiteInitEror, expectBuildError bool, depsCfg deps.DepsCfg, buildCfg BuildCfg) *Site {
-	h, err := NewHugoSites(depsCfg)
+	t.Helper()
+	b := newTestSitesBuilderFromDepsCfg(t, depsCfg).WithNothingAdded()
+
+	err := b.CreateSitesE()
 
 	if expectSiteInitEror {
 		require.Error(t, err)
@@ -708,6 +829,8 @@ func buildSingleSiteExpected(t testing.TB, expectSiteInitEror, expectBuildError
 		require.NoError(t, err)
 	}
 
+	h := b.H
+
 	require.Len(t, h.Sites, 1)
 
 	if expectBuildError {
@@ -751,9 +874,13 @@ func content(c resource.ContentProvider) string {
 func dumpPages(pages ...page.Page) {
 	fmt.Println("---------")
 	for i, p := range pages {
-		fmt.Printf("%d: Kind: %s Title: %-10s RelPermalink: %-10s Path: %-10s sections: %s\n",
+		var meta interface{}
+		if p.File() != nil && p.File().FileInfo() != nil {
+			meta = p.File().FileInfo().Meta()
+		}
+		fmt.Printf("%d: Kind: %s Title: %-10s RelPermalink: %-10s Path: %-10s sections: %s Lang: %s Meta: %v\n",
 			i+1,
-			p.Kind(), p.Title(), p.RelPermalink(), p.Path(), p.SectionsPath())
+			p.Kind(), p.Title(), p.RelPermalink(), p.Path(), p.SectionsPath(), p.Lang(), meta)
 	}
 }
 
@@ -802,3 +929,10 @@ func parallel(t *testing.T) {
 		t.Parallel()
 	}
 }
+
+func skipSymlink(t *testing.T) {
+	if runtime.GOOS == "windows" && os.Getenv("CI") == "" {
+		t.Skip("skip symlink test on local Windows (needs admin)")
+	}
+
+}