all: Refactor to nonglobal Viper, i18n etc.

This is a final rewrite that removes all the global state in Hugo, which also enables
the use if `t.Parallel` in tests.

Updates #2701
Fixes #3016

6 files changed, 67 insertions, 59 deletions

diff --git a/source/content_directory_test.go b/source/content_directory_test.go
index 107ca9837..48c3ae903 100644
--- a/source/content_directory_test.go
+++ b/source/content_directory_test.go
@@ -14,13 +14,13 @@
 package source
 
 import (
-	"github.com/spf13/viper"
 	"testing"
+
+	"github.com/spf13/hugo/hugofs"
+	"github.com/spf13/viper"
 )
 
 func TestIgnoreDotFilesAndDirectories(t *testing.T) {
-	viper.Reset()
-	defer viper.Reset()
 
 	tests := []struct {
 		path                string
@@ -49,9 +49,12 @@ func TestIgnoreDotFilesAndDirectories(t *testing.T) {
 
 	for _, test := range tests {
 
-		viper.Set("ignoreFiles", test.ignoreFilesRegexpes)
+		v := viper.New()
+		v.Set("ignoreFiles", test.ignoreFilesRegexpes)
+
+		s := NewSourceSpec(v, hugofs.NewMem(v))
 
-		if ignored := isNonProcessablePath(test.path); test.ignore != ignored {
+		if ignored := s.isNonProcessablePath(test.path); test.ignore != ignored {
 			t.Errorf("File not ignored.  Expected: %t, got: %t", test.ignore, ignored)
 		}
 	}
diff --git a/source/file.go b/source/file.go
index 18ed9d6f9..1dff9ac0b 100644
--- a/source/file.go
+++ b/source/file.go
@@ -18,10 +18,21 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/spf13/hugo/hugofs"
+
+	"github.com/spf13/hugo/config"
 	"github.com/spf13/hugo/helpers"
-	"github.com/spf13/viper"
 )
 
+type SourceSpec struct {
+	Cfg config.Provider
+	Fs  *hugofs.Fs
+}
+
+func NewSourceSpec(cfg config.Provider, fs *hugofs.Fs) SourceSpec {
+	return SourceSpec{Cfg: cfg, Fs: fs}
+}
+
 // File represents a source content file.
 // All paths are relative from the source directory base
 type File struct {
@@ -110,15 +121,15 @@ func (f *File) Path() string {
 
 // NewFileWithContents creates a new File pointer with the given relative path and
 // content. The language defaults to "en".
-func NewFileWithContents(relpath string, content io.Reader) *File {
-	file := NewFile(relpath)
+func (sp SourceSpec) NewFileWithContents(relpath string, content io.Reader) *File {
+	file := sp.NewFile(relpath)
 	file.Contents = content
 	file.lang = "en"
 	return file
 }
 
 // NewFile creates a new File pointer with the given relative path.
-func NewFile(relpath string) *File {
+func (sp SourceSpec) NewFile(relpath string) *File {
 	f := &File{
 		relpath: relpath,
 	}
@@ -128,8 +139,8 @@ func NewFile(relpath string) *File {
 	f.baseName = helpers.Filename(f.LogicalName())
 
 	lang := strings.TrimPrefix(filepath.Ext(f.baseName), ".")
-	if _, ok := viper.GetStringMap("languages")[lang]; lang == "" || !ok {
-		f.lang = viper.GetString("defaultContentLanguage")
+	if _, ok := sp.Cfg.GetStringMap("languages")[lang]; lang == "" || !ok {
+		f.lang = sp.Cfg.GetString("defaultContentLanguage")
 		f.translationBaseName = f.baseName
 	} else {
 		f.lang = lang
@@ -144,11 +155,11 @@ func NewFile(relpath string) *File {
 
 // NewFileFromAbs creates a new File pointer with the given full file path path and
 // content.
-func NewFileFromAbs(base, fullpath string, content io.Reader) (f *File, err error) {
+func (sp SourceSpec) NewFileFromAbs(base, fullpath string, content io.Reader) (f *File, err error) {
 	var name string
 	if name, err = helpers.GetRelativePath(fullpath, base); err != nil {
 		return nil, err
 	}
 
-	return NewFileWithContents(name, content), nil
+	return sp.NewFileWithContents(name, content), nil
 }
diff --git a/source/file_test.go b/source/file_test.go
index 517474012..d87a154f5 100644
--- a/source/file_test.go
+++ b/source/file_test.go
@@ -18,28 +18,40 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/spf13/hugo/hugofs"
+	"github.com/spf13/viper"
+
 	"github.com/stretchr/testify/assert"
 )
 
 func TestFileUniqueID(t *testing.T) {
+	ss := newTestSourceSpec()
+
 	f1 := File{uniqueID: "123"}
-	f2 := NewFile("a")
+	f2 := ss.NewFile("a")
 
 	assert.Equal(t, "123", f1.UniqueID())
 	assert.Equal(t, "0cc175b9c0f1b6a831c399e269772661", f2.UniqueID())
 
-	f3 := NewFile(filepath.FromSlash("test1/index.md"))
-	f4 := NewFile(filepath.FromSlash("test2/index.md"))
+	f3 := ss.NewFile(filepath.FromSlash("test1/index.md"))
+	f4 := ss.NewFile(filepath.FromSlash("test2/index.md"))
 
 	assert.NotEqual(t, f3.UniqueID(), f4.UniqueID())
 }
 
 func TestFileString(t *testing.T) {
-	assert.Equal(t, "abc", NewFileWithContents("a", strings.NewReader("abc")).String())
-	assert.Equal(t, "", NewFile("a").String())
+	ss := newTestSourceSpec()
+	assert.Equal(t, "abc", ss.NewFileWithContents("a", strings.NewReader("abc")).String())
+	assert.Equal(t, "", ss.NewFile("a").String())
 }
 
 func TestFileBytes(t *testing.T) {
-	assert.Equal(t, []byte("abc"), NewFileWithContents("a", strings.NewReader("abc")).Bytes())
-	assert.Equal(t, []byte(""), NewFile("a").Bytes())
+	ss := newTestSourceSpec()
+	assert.Equal(t, []byte("abc"), ss.NewFileWithContents("a", strings.NewReader("abc")).Bytes())
+	assert.Equal(t, []byte(""), ss.NewFile("a").Bytes())
+}
+
+func newTestSourceSpec() SourceSpec {
+	v := viper.New()
+	return SourceSpec{Fs: hugofs.NewMem(v), Cfg: v}
 }
diff --git a/source/filesystem.go b/source/filesystem.go
index 6089824a0..a13128144 100644
--- a/source/filesystem.go
+++ b/source/filesystem.go
@@ -21,13 +21,10 @@ import (
 	"runtime"
 	"strings"
 
-	"github.com/spf13/hugo/hugofs"
-	"golang.org/x/text/unicode/norm"
-
-	"github.com/spf13/viper"
-
+	"github.com/spf13/cast"
 	"github.com/spf13/hugo/helpers"
 	jww "github.com/spf13/jwalterweatherman"
+	"golang.org/x/text/unicode/norm"
 )
 
 type Input interface {
@@ -39,11 +36,11 @@ type Filesystem struct {
 	Base       string
 	AvoidPaths []string
 
-	fs *hugofs.Fs
+	SourceSpec
 }
 
-func NewFilesystem(fs *hugofs.Fs, base string, avoidPaths ...string) *Filesystem {
-	return &Filesystem{fs: fs, Base: base, AvoidPaths: avoidPaths}
+func (sp SourceSpec) NewFilesystem(base string, avoidPaths ...string) *Filesystem {
+	return &Filesystem{SourceSpec: sp, Base: base, AvoidPaths: avoidPaths}
 }
 
 func (f *Filesystem) FilesByExts(exts ...string) []*File {
@@ -79,7 +76,7 @@ func (f *Filesystem) add(name string, reader io.Reader) (err error) {
 		name = norm.NFC.String(name)
 	}
 
-	file, err = NewFileFromAbs(f.Base, name, reader)
+	file, err = f.SourceSpec.NewFileFromAbs(f.Base, name, reader)
 
 	if err == nil {
 		f.files = append(f.files, file)
@@ -98,7 +95,7 @@ func (f *Filesystem) captureFiles() {
 			return err
 		}
 		if b {
-			rd, err := NewLazyFileReader(f.fs.Source, filePath)
+			rd, err := NewLazyFileReader(f.Fs.Source, filePath)
 			if err != nil {
 				return err
 			}
@@ -107,10 +104,10 @@ func (f *Filesystem) captureFiles() {
 		return err
 	}
 
-	if f.fs == nil {
+	if f.Fs == nil {
 		panic("Must have a fs")
 	}
-	err := helpers.SymbolicWalk(f.fs.Source, f.Base, walker)
+	err := helpers.SymbolicWalk(f.Fs.Source, f.Base, walker)
 
 	if err != nil {
 		jww.ERROR.Println(err)
@@ -128,7 +125,7 @@ func (f *Filesystem) shouldRead(filePath string, fi os.FileInfo) (bool, error) {
 			jww.ERROR.Printf("Cannot read symbolic link '%s', error was: %s", filePath, err)
 			return false, nil
 		}
-		linkfi, err := f.fs.Source.Stat(link)
+		linkfi, err := f.Fs.Source.Stat(link)
 		if err != nil {
 			jww.ERROR.Printf("Cannot stat '%s', error was: %s", link, err)
 			return false, nil
@@ -140,13 +137,13 @@ func (f *Filesystem) shouldRead(filePath string, fi os.FileInfo) (bool, error) {
 	}
 
 	if fi.IsDir() {
-		if f.avoid(filePath) || isNonProcessablePath(filePath) {
+		if f.avoid(filePath) || f.isNonProcessablePath(filePath) {
 			return false, filepath.SkipDir
 		}
 		return false, nil
 	}
 
-	if isNonProcessablePath(filePath) {
+	if f.isNonProcessablePath(filePath) {
 		return false, nil
 	}
 	return true, nil
@@ -161,14 +158,14 @@ func (f *Filesystem) avoid(filePath string) bool {
 	return false
 }
 
-func isNonProcessablePath(filePath string) bool {
+func (s SourceSpec) isNonProcessablePath(filePath string) bool {
 	base := filepath.Base(filePath)
 	if strings.HasPrefix(base, ".") ||
 		strings.HasPrefix(base, "#") ||
 		strings.HasSuffix(base, "~") {
 		return true
 	}
-	ignoreFiles := viper.GetStringSlice("ignoreFiles")
+	ignoreFiles := cast.ToStringSlice(s.Cfg.Get("ignoreFiles"))
 	if len(ignoreFiles) > 0 {
 		for _, ignorePattern := range ignoreFiles {
 			match, err := regexp.MatchString(ignorePattern, filePath)
diff --git a/source/filesystem_test.go b/source/filesystem_test.go
index 598a1b81d..90512ce3f 100644
--- a/source/filesystem_test.go
+++ b/source/filesystem_test.go
@@ -19,12 +19,11 @@ import (
 	"runtime"
 	"strings"
 	"testing"
-
-	"github.com/spf13/hugo/hugofs"
 )
 
 func TestEmptySourceFilesystem(t *testing.T) {
-	src := NewFilesystem(hugofs.NewMem(), "Empty")
+	ss := newTestSourceSpec()
+	src := ss.NewFilesystem("Empty")
 	if len(src.Files()) != 0 {
 		t.Errorf("new filesystem should contain 0 files.")
 	}
@@ -39,12 +38,12 @@ type TestPath struct {
 }
 
 func TestAddFile(t *testing.T) {
-	fs := hugofs.NewMem()
+	ss := newTestSourceSpec()
 	tests := platformPaths
 	for _, test := range tests {
 		base := platformBase
-		srcDefault := NewFilesystem(fs, "")
-		srcWithBase := NewFilesystem(fs, base)
+		srcDefault := ss.NewFilesystem("")
+		srcWithBase := ss.NewFilesystem(base)
 
 		for _, src := range []*Filesystem{srcDefault, srcWithBase} {
 
@@ -100,10 +99,10 @@ func TestUnicodeNorm(t *testing.T) {
 		{NFC: "é", NFD: "\x65\xcc\x81"},
 	}
 
-	fs := hugofs.NewMem()
+	ss := newTestSourceSpec()
 
 	for _, path := range paths {
-		src := NewFilesystem(fs, "")
+		src := ss.NewFilesystem("")
 		_ = src.add(path.NFD, strings.NewReader(""))
 		f := src.Files()[0]
 		if f.BaseFileName() != path.NFC {
diff --git a/source/inmemory.go b/source/inmemory.go
index 9d3af5194..431236a56 100644
--- a/source/inmemory.go
+++ b/source/inmemory.go
@@ -13,8 +13,6 @@
 
 package source
 
-import "bytes"
-
 type ByteSource struct {
 	Name    string
 	Content []byte
@@ -23,15 +21,3 @@ type ByteSource struct {
 func (b *ByteSource) String() string {
 	return b.Name + " " + string(b.Content)
 }
-
-type InMemorySource struct {
-	ByteSource []ByteSource
-}
-
-func (i *InMemorySource) Files() (files []*File) {
-	files = make([]*File, len(i.ByteSource))
-	for i, fake := range i.ByteSource {
-		files[i] = NewFileWithContents(fake.Name, bytes.NewReader(fake.Content))
-	}
-	return
-}