1 files changed, 121 insertions, 0 deletions
diff --git a/source/filesystem.go b/source/filesystem.go
new file mode 100644
index 000000000..283863dbf
--- /dev/null
+++ b/source/filesystem.go
@@ -0,0 +1,121 @@
+// Copyright 2016 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package source
+
+import (
+	"fmt"
+	"path/filepath"
+	"sync"
+
+	"github.com/gohugoio/hugo/hugofs"
+)
+
+// Filesystem represents a source filesystem.
+type Filesystem struct {
+	files        []File
+	filesInit    sync.Once
+	filesInitErr error
+
+	Base string
+
+	fi hugofs.FileMetaInfo
+
+	SourceSpec
+}
+
+// NewFilesystem returns a new filesystem for a given source spec.
+func (sp SourceSpec) NewFilesystem(base string) *Filesystem {
+	return &Filesystem{SourceSpec: sp, Base: base}
+}
+
+func (sp SourceSpec) NewFilesystemFromFileMetaInfo(fi hugofs.FileMetaInfo) *Filesystem {
+	return &Filesystem{SourceSpec: sp, fi: fi}
+}
+
+// Files returns a slice of readable files.
+func (f *Filesystem) Files() ([]File, error) {
+	f.filesInit.Do(func() {
+		err := f.captureFiles()
+		if err != nil {
+			f.filesInitErr = fmt.Errorf("capture files: %w", err)
+		}
+	})
+	return f.files, f.filesInitErr
+}
+
+// add populates a file in the Filesystem.files
+func (f *Filesystem) add(name string, fi hugofs.FileMetaInfo) (err error) {
+	var file File
+
+	file, err = f.SourceSpec.NewFileInfo(fi)
+	if err != nil {
+		return err
+	}
+
+	f.files = append(f.files, file)
+
+	return err
+}
+
+func (f *Filesystem) captureFiles() error {
+	walker := func(path string, fi hugofs.FileMetaInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if fi.IsDir() {
+			return nil
+		}
+
+		meta := fi.Meta()
+		filename := meta.Filename
+
+		b, err := f.shouldRead(filename, fi)
+		if err != nil {
+			return err
+		}
+
+		if b {
+			err = f.add(filename, fi)
+		}
+
+		return err
+	}
+
+	w := hugofs.NewWalkway(hugofs.WalkwayConfig{
+		Fs:     f.SourceFs,
+		Info:   f.fi,
+		Root:   f.Base,
+		WalkFn: walker,
+	})
+
+	return w.Walk()
+}
+
+func (f *Filesystem) shouldRead(filename string, fi hugofs.FileMetaInfo) (bool, error) {
+	ignore := f.SourceSpec.IgnoreFile(fi.Meta().Filename)
+
+	if fi.IsDir() {
+		if ignore {
+			return false, filepath.SkipDir
+		}
+		return false, nil
+	}
+
+	if ignore {
+		return false, nil
+	}
+
+	return true, nil
+}