resources: Move resource interfaces into its own package

41 files changed, 461 insertions, 377 deletions

diff --git a/deps/deps.go b/deps/deps.go
index 7fba0e153..628019961 100644
--- a/deps/deps.go
+++ b/deps/deps.go
@@ -16,7 +16,7 @@ import (
 	"github.com/gohugoio/hugo/media"
 	"github.com/gohugoio/hugo/metrics"
 	"github.com/gohugoio/hugo/output"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
 	"github.com/gohugoio/hugo/source"
 	"github.com/gohugoio/hugo/tpl"
 	jww "github.com/spf13/jwalterweatherman"
@@ -52,7 +52,7 @@ type Deps struct {
 	SourceSpec *source.SourceSpec `json:"-"`
 
 	// The Resource Spec to use
-	ResourceSpec *resource.Spec
+	ResourceSpec *resources.Spec
 
 	// The configuration to use
 	Cfg config.Provider `json:"-"`
@@ -214,7 +214,7 @@ func New(cfg DepsCfg) (*Deps, error) {
 		return nil, errors.WithMessage(err, "failed to create file caches from configuration")
 	}
 
-	resourceSpec, err := resource.NewSpec(ps, fileCaches, logger, cfg.OutputFormats, cfg.MediaTypes)
+	resourceSpec, err := resources.NewSpec(ps, fileCaches, logger, cfg.OutputFormats, cfg.MediaTypes)
 	if err != nil {
 		return nil, err
 	}
@@ -281,7 +281,7 @@ func (d Deps) ForLanguage(cfg DepsCfg, onCreated func(d *Deps) error) (*Deps, er
 	// The resource cache is global so reuse.
 	// TODO(bep) clean up these inits.
 	resourceCache := d.ResourceSpec.ResourceCache
-	d.ResourceSpec, err = resource.NewSpec(d.PathSpec, d.ResourceSpec.FileCaches, d.Log, cfg.OutputFormats, cfg.MediaTypes)
+	d.ResourceSpec, err = resources.NewSpec(d.PathSpec, d.ResourceSpec.FileCaches, d.Log, cfg.OutputFormats, cfg.MediaTypes)
 	if err != nil {
 		return nil, err
 	}
diff --git a/hugolib/collections.go b/hugolib/collections.go
index b9992c425..cf75d3732 100644
--- a/hugolib/collections.go
+++ b/hugolib/collections.go
@@ -16,7 +16,7 @@ package hugolib
 import (
 	"fmt"
 
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources/resource"
 
 	"github.com/gohugoio/hugo/common/collections"
 )
diff --git a/hugolib/page.go b/hugolib/page.go
index 9f09dc9bd..71070d1e8 100644
--- a/hugolib/page.go
+++ b/hugolib/page.go
@@ -35,7 +35,7 @@ import (
 
 	"github.com/gohugoio/hugo/helpers"
 	"github.com/gohugoio/hugo/hugolib/pagemeta"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources/resource"
 
 	"github.com/gohugoio/hugo/output"
 	"github.com/mitchellh/mapstructure"
diff --git a/hugolib/page_output.go b/hugolib/page_output.go
index 9a6531207..0a3eef9a6 100644
--- a/hugolib/page_output.go
+++ b/hugolib/page_output.go
@@ -24,7 +24,7 @@ import (
 
 	"github.com/gohugoio/hugo/tpl"
 
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources/resource"
 
 	"github.com/gohugoio/hugo/media"
 
diff --git a/hugolib/page_resource.go b/hugolib/page_resource.go
index 808a692da..201076e8b 100644
--- a/hugolib/page_resource.go
+++ b/hugolib/page_resource.go
@@ -14,7 +14,7 @@
 package hugolib
 
 import (
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources/resource"
 )
 
 var (
diff --git a/hugolib/pagebundler_handlers.go b/hugolib/pagebundler_handlers.go
index fdff76e24..2df1f8765 100644
--- a/hugolib/pagebundler_handlers.go
+++ b/hugolib/pagebundler_handlers.go
@@ -22,7 +22,8 @@ import (
 	"strings"
 
 	"github.com/gohugoio/hugo/helpers"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
+	"github.com/gohugoio/hugo/resources/resource"
 )
 
 var (
@@ -255,7 +256,7 @@ func (c *contentHandlers) parsePage(h contentHandler) contentHandler {
 
 			// Assign metadata from front matter if set
 			if len(p.resourcesMetadata) > 0 {
-				resource.AssignMetadata(p.resourcesMetadata, p.Resources...)
+				resources.AssignMetadata(p.resourcesMetadata, p.Resources...)
 			}
 
 		}
@@ -309,7 +310,7 @@ func (c *contentHandlers) createResource() contentHandler {
 		}
 
 		resource, err := c.s.ResourceSpec.New(
-			resource.ResourceSourceDescriptor{
+			resources.ResourceSourceDescriptor{
 				TargetPathBuilder: ctx.parentPage.subResourceTargetPathFactory,
 				SourceFile:        ctx.source,
 				RelTargetFilename: ctx.target,
diff --git a/hugolib/pages_language_merge_test.go b/hugolib/pages_language_merge_test.go
index 6706af3bc..efcfbf04b 100644
--- a/hugolib/pages_language_merge_test.go
+++ b/hugolib/pages_language_merge_test.go
@@ -17,7 +17,7 @@ import (
 	"fmt"
 	"testing"
 
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources/resource"
 	"github.com/stretchr/testify/require"
 )
 
diff --git a/hugolib/resource_chain_test.go b/hugolib/resource_chain_test.go
index 0fe9c70c1..f53ab4966 100644
--- a/hugolib/resource_chain_test.go
+++ b/hugolib/resource_chain_test.go
@@ -25,7 +25,7 @@ import (
 	"github.com/gohugoio/hugo/hugofs"
 
 	"github.com/gohugoio/hugo/common/loggers"
-	"github.com/gohugoio/hugo/resource/resource_transformers/tocss/scss"
+	"github.com/gohugoio/hugo/resources/resource_transformers/tocss/scss"
 )
 
 func TestSCSSWithIncludePaths(t *testing.T) {
diff --git a/hugolib/site.go b/hugolib/site.go
index 9c225b332..43b398b70 100644
--- a/hugolib/site.go
+++ b/hugolib/site.go
@@ -39,7 +39,6 @@ import (
 	"github.com/gohugoio/hugo/common/hugo"
 	"github.com/gohugoio/hugo/common/maps"
 	"github.com/gohugoio/hugo/publisher"
-	"github.com/gohugoio/hugo/resource"
 	_errors "github.com/pkg/errors"
 
 	"github.com/gohugoio/hugo/langs"
@@ -62,6 +61,7 @@ import (
 	"github.com/gohugoio/hugo/hugolib/pagemeta"
 	"github.com/gohugoio/hugo/output"
 	"github.com/gohugoio/hugo/related"
+	"github.com/gohugoio/hugo/resources"
 	"github.com/gohugoio/hugo/source"
 	"github.com/gohugoio/hugo/tpl"
 	"github.com/spf13/afero"
@@ -760,7 +760,7 @@ func (s *Site) processPartial(events []fsnotify.Event) (whatChanged, error) {
 	cachePartitions := make([]string, len(events))
 
 	for i, ev := range events {
-		cachePartitions[i] = resource.ResourceKeyPartition(ev.Name)
+		cachePartitions[i] = resources.ResourceKeyPartition(ev.Name)
 
 		if s.isContentDirEvent(ev) {
 			logger.Println("Source changed", ev)
diff --git a/resource/image.go b/resources/image.go
index 6dea4cbb8..d46facac5 100644
--- a/resource/image.go
+++ b/resources/image.go
@@ -1,4 +1,4 @@
-// Copyright 2017-present The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"errors"
@@ -27,6 +27,8 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/gohugoio/hugo/resources/resource"
+
 	_errors "github.com/pkg/errors"
 
 	"github.com/disintegration/imaging"
@@ -43,9 +45,9 @@ import (
 )
 
 var (
-	_ Resource = (*Image)(nil)
-	_ Source   = (*Image)(nil)
-	_ Cloner   = (*Image)(nil)
+	_ resource.Resource = (*Image)(nil)
+	_ resource.Source   = (*Image)(nil)
+	_ resource.Cloner   = (*Image)(nil)
 )
 
 // Imaging contains default image processing configuration. This will be fetched
@@ -146,7 +148,7 @@ func (i *Image) Height() int {
 }
 
 // WithNewBase implements the Cloner interface.
-func (i *Image) WithNewBase(base string) Resource {
+func (i *Image) WithNewBase(base string) resource.Resource {
 	return &Image{
 		imaging:         i.imaging,
 		format:          i.format,
diff --git a/resource/image_cache.go b/resources/image_cache.go
index 8cc626caf..58be839b3 100644
--- a/resource/image_cache.go
+++ b/resources/image_cache.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"fmt"
diff --git a/resource/image_test.go b/resources/image_test.go
index 07eab5d56..ffa482296 100644
--- a/resource/image_test.go
+++ b/resources/image_test.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"fmt"
diff --git a/resources/internal/glob.go b/resources/internal/glob.go
new file mode 100644
index 000000000..a87a23f13
--- /dev/null
+++ b/resources/internal/glob.go
@@ -0,0 +1,48 @@
+// Copyright 2019 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 internal
+
+import (
+	"strings"
+	"sync"
+
+	"github.com/gobwas/glob"
+)
+
+var (
+	globCache = make(map[string]glob.Glob)
+	globMu    sync.RWMutex
+)
+
+func GetGlob(pattern string) (glob.Glob, error) {
+	var g glob.Glob
+
+	globMu.RLock()
+	g, found := globCache[pattern]
+	globMu.RUnlock()
+	if !found {
+		var err error
+		g, err = glob.Compile(strings.ToLower(pattern), '/')
+		if err != nil {
+			return nil, err
+		}
+
+		globMu.Lock()
+		globCache[pattern] = g
+		globMu.Unlock()
+	}
+
+	return g, nil
+
+}
diff --git a/resource/resource.go b/resources/resource.go
index 0f5a43648..742903e80 100644
--- a/resource/resource.go
+++ b/resources/resource.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"fmt"
@@ -24,6 +24,8 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/gohugoio/hugo/media"
+
 	"github.com/gohugoio/hugo/output"
 	"github.com/gohugoio/hugo/tpl"
 	"github.com/pkg/errors"
@@ -32,35 +34,28 @@ import (
 	"github.com/gohugoio/hugo/common/collections"
 	"github.com/gohugoio/hugo/common/hugio"
 	"github.com/gohugoio/hugo/common/loggers"
+	"github.com/gohugoio/hugo/resources/resource"
 
 	"github.com/spf13/afero"
 
-	"github.com/gobwas/glob"
 	"github.com/gohugoio/hugo/helpers"
-	"github.com/gohugoio/hugo/media"
 	"github.com/gohugoio/hugo/source"
 )
 
 var (
-	_ ContentResource         = (*genericResource)(nil)
-	_ ReadSeekCloserResource  = (*genericResource)(nil)
-	_ Resource                = (*genericResource)(nil)
-	_ Source                  = (*genericResource)(nil)
-	_ Cloner                  = (*genericResource)(nil)
-	_ ResourcesLanguageMerger = (*Resources)(nil)
-	_ permalinker             = (*genericResource)(nil)
-	_ collections.Slicer      = (*genericResource)(nil)
-	_ Identifier              = (*genericResource)(nil)
+	_ resource.ContentResource         = (*genericResource)(nil)
+	_ resource.ReadSeekCloserResource  = (*genericResource)(nil)
+	_ resource.Resource                = (*genericResource)(nil)
+	_ resource.Source                  = (*genericResource)(nil)
+	_ resource.Cloner                  = (*genericResource)(nil)
+	_ resource.ResourcesLanguageMerger = (*resource.Resources)(nil)
+	_ permalinker                      = (*genericResource)(nil)
+	_ collections.Slicer               = (*genericResource)(nil)
+	_ resource.Identifier              = (*genericResource)(nil)
 )
 
 var noData = make(map[string]interface{})
 
-// Source is an internal template and not meant for use in the templates. It
-// may change without notice.
-type Source interface {
-	Publish() error
-}
-
 type permalinker interface {
 	relPermalinkFor(target string) string
 	permalinkFor(target string) string
@@ -69,215 +64,6 @@ type permalinker interface {
 	targetPath() string
 }
 
-// Cloner is an internal template and not meant for use in the templates. It
-// may change without notice.
-type Cloner interface {
-	WithNewBase(base string) Resource
-}
-
-// Resource represents a linkable resource, i.e. a content page, image etc.
-type Resource interface {
-	resourceBase
-
-	// Permalink represents the absolute link to this resource.
-	Permalink() string
-
-	// RelPermalink represents the host relative link to this resource.
-	RelPermalink() string
-
-	// ResourceType is the resource type. For most file types, this is the main
-	// part of the MIME type, e.g. "image", "application", "text" etc.
-	// For content pages, this value is "page".
-	ResourceType() string
-
-	// Name is the logical name of this resource. This can be set in the front matter
-	// metadata for this resource. If not set, Hugo will assign a value.
-	// This will in most cases be the base filename.
-	// So, for the image "/some/path/sunset.jpg" this will be "sunset.jpg".
-	// The value returned by this method will be used in the GetByPrefix and ByPrefix methods
-	// on Resources.
-	Name() string
-
-	// Title returns the title if set in front matter. For content pages, this will be the expected value.
-	Title() string
-
-	// Resource specific data set by Hugo.
-	// One example would be.Data.Digest for fingerprinted resources.
-	Data() interface{}
-
-	// Params set in front matter for this resource.
-	Params() map[string]interface{}
-}
-
-// resourceBase pulls out the minimal set of operations to define a Resource,
-// to simplify testing etc.
-type resourceBase interface {
-	// MediaType is this resource's MIME type.
-	MediaType() media.Type
-}
-
-// ResourcesLanguageMerger describes an interface for merging resources from a
-// different language.
-type ResourcesLanguageMerger interface {
-	MergeByLanguage(other Resources) Resources
-	// Needed for integration with the tpl package.
-	MergeByLanguageInterface(other interface{}) (interface{}, error)
-}
-
-type translatedResource interface {
-	TranslationKey() string
-}
-
-// Identifier identifies a resource.
-type Identifier interface {
-	Key() string
-}
-
-// ContentResource represents a Resource that provides a way to get to its content.
-// Most Resource types in Hugo implements this interface, including Page.
-// This should be used with care, as it will read the file content into memory, but it
-// should be cached as effectively as possible by the implementation.
-type ContentResource interface {
-	resourceBase
-
-	// Content returns this resource's content. It will be equivalent to reading the content
-	// that RelPermalink points to in the published folder.
-	// The return type will be contextual, and should be what you would expect:
-	// * Page: template.HTML
-	// * JSON: String
-	// * Etc.
-	Content() (interface{}, error)
-}
-
-// OpenReadSeekCloser allows setting some other way (than reading from a filesystem)
-// to open or create a ReadSeekCloser.
-type OpenReadSeekCloser func() (hugio.ReadSeekCloser, error)
-
-// ReadSeekCloserResource is a Resource that supports loading its content.
-type ReadSeekCloserResource interface {
-	resourceBase
-	ReadSeekCloser() (hugio.ReadSeekCloser, error)
-}
-
-// Resources represents a slice of resources, which can be a mix of different types.
-// I.e. both pages and images etc.
-type Resources []Resource
-
-// ResourcesConverter converts a given slice of Resource objects to Resources.
-type ResourcesConverter interface {
-	ToResources() Resources
-}
-
-// ByType returns resources of a given resource type (ie. "image").
-func (r Resources) ByType(tp string) Resources {
-	var filtered Resources
-
-	for _, resource := range r {
-		if resource.ResourceType() == tp {
-			filtered = append(filtered, resource)
-		}
-	}
-	return filtered
-}
-
-// GetMatch finds the first Resource matching the given pattern, or nil if none found.
-// See Match for a more complete explanation about the rules used.
-func (r Resources) GetMatch(pattern string) Resource {
-	g, err := getGlob(pattern)
-	if err != nil {
-		return nil
-	}
-
-	for _, resource := range r {
-		if g.Match(strings.ToLower(resource.Name())) {
-			return resource
-		}
-	}
-
-	return nil
-}
-
-// Match gets all resources matching the given base filename prefix, e.g
-// "*.png" will match all png files. The "*" does not match path delimiters (/),
-// so if you organize your resources in sub-folders, you need to be explicit about it, e.g.:
-// "images/*.png". To match any PNG image anywhere in the bundle you can do "**.png", and
-// to match all PNG images below the images folder, use "images/**.jpg".
-// The matching is case insensitive.
-// Match matches by using the value of Resource.Name, which, by default, is a filename with
-// path relative to the bundle root with Unix style slashes (/) and no leading slash, e.g. "images/logo.png".
-// See https://github.com/gobwas/glob for the full rules set.
-func (r Resources) Match(pattern string) Resources {
-	g, err := getGlob(pattern)
-	if err != nil {
-		return nil
-	}
-
-	var matches Resources
-	for _, resource := range r {
-		if g.Match(strings.ToLower(resource.Name())) {
-			matches = append(matches, resource)
-		}
-	}
-	return matches
-}
-
-var (
-	globCache = make(map[string]glob.Glob)
-	globMu    sync.RWMutex
-)
-
-func getGlob(pattern string) (glob.Glob, error) {
-	var g glob.Glob
-
-	globMu.RLock()
-	g, found := globCache[pattern]
-	globMu.RUnlock()
-	if !found {
-		var err error
-		g, err = glob.Compile(strings.ToLower(pattern), '/')
-		if err != nil {
-			return nil, err
-		}
-
-		globMu.Lock()
-		globCache[pattern] = g
-		globMu.Unlock()
-	}
-
-	return g, nil
-
-}
-
-// MergeByLanguage adds missing translations in r1 from r2.
-func (r Resources) MergeByLanguage(r2 Resources) Resources {
-	result := append(Resources(nil), r...)
-	m := make(map[string]bool)
-	for _, rr := range r {
-		if translated, ok := rr.(translatedResource); ok {
-			m[translated.TranslationKey()] = true
-		}
-	}
-
-	for _, rr := range r2 {
-		if translated, ok := rr.(translatedResource); ok {
-			if _, found := m[translated.TranslationKey()]; !found {
-				result = append(result, rr)
-			}
-		}
-	}
-	return result
-}
-
-// MergeByLanguageInterface is the generic version of MergeByLanguage. It
-// is here just so it can be called from the tpl package.
-func (r Resources) MergeByLanguageInterface(in interface{}) (interface{}, error) {
-	r2, ok := in.(Resources)
-	if !ok {
-		return nil, fmt.Errorf("%T cannot be merged by language", in)
-	}
-	return r.MergeByLanguage(r2), nil
-}
-
 type Spec struct {
 	*helpers.PathSpec
 
@@ -336,7 +122,7 @@ type ResourceSourceDescriptor struct {
 
 	// Need one of these to load the resource content.
 	SourceFile         source.File
-	OpenReadSeekCloser OpenReadSeekCloser
+	OpenReadSeekCloser resource.OpenReadSeekCloser
 
 	// If OpenReadSeekerCloser is not set, we use this to open the file.
 	SourceFilename string
@@ -370,15 +156,15 @@ func (r *Spec) sourceFs() afero.Fs {
 	return r.PathSpec.BaseFs.Content.Fs
 }
 
-func (r *Spec) New(fd ResourceSourceDescriptor) (Resource, error) {
+func (r *Spec) New(fd ResourceSourceDescriptor) (resource.Resource, error) {
 	return r.newResourceForFs(r.sourceFs(), fd)
 }
 
-func (r *Spec) NewForFs(sourceFs afero.Fs, fd ResourceSourceDescriptor) (Resource, error) {
+func (r *Spec) NewForFs(sourceFs afero.Fs, fd ResourceSourceDescriptor) (resource.Resource, error) {
 	return r.newResourceForFs(sourceFs, fd)
 }
 
-func (r *Spec) newResourceForFs(sourceFs afero.Fs, fd ResourceSourceDescriptor) (Resource, error) {
+func (r *Spec) newResourceForFs(sourceFs afero.Fs, fd ResourceSourceDescriptor) (resource.Resource, error) {
 	if fd.OpenReadSeekCloser == nil {
 		if fd.SourceFile != nil && fd.SourceFilename != "" {
 			return nil, errors.New("both SourceFile and AbsSourceFilename provided")
@@ -399,7 +185,7 @@ func (r *Spec) newResourceForFs(sourceFs afero.Fs, fd ResourceSourceDescriptor)
 	return r.newResource(sourceFs, fd)
 }
 
-func (r *Spec) newResource(sourceFs afero.Fs, fd ResourceSourceDescriptor) (Resource, error) {
+func (r *Spec) newResource(sourceFs afero.Fs, fd ResourceSourceDescriptor) (resource.Resource, error) {
 	var fi os.FileInfo
 	var sourceFilename string
 
@@ -551,7 +337,7 @@ type publishOnce struct {
 	logger        *loggers.Logger
 }
 
-func (l *publishOnce) publish(s Source) error {
+func (l *publishOnce) publish(s resource.Source) error {
 	l.publisherInit.Do(func() {
 		l.publisherErr = s.Publish()
 		if l.publisherErr != nil {
@@ -577,7 +363,7 @@ type genericResource struct {
 	sourceFilename string
 
 	// Will be set if this resource is backed by something other than a file.
-	openReadSeekerCloser OpenReadSeekCloser
+	openReadSeekerCloser resource.OpenReadSeekCloser
 
 	// A hash of the source content. Is only calculated in caching situations.
 	*resourceHash
@@ -632,7 +418,7 @@ func (l *genericResource) MediaType() media.Type {
 }
 
 // Implement the Cloner interface.
-func (l genericResource) WithNewBase(base string) Resource {
+func (l genericResource) WithNewBase(base string) resource.Resource {
 	l.baseOffset = base
 	l.resourceContent = &resourceContent{}
 	return &l
@@ -642,12 +428,12 @@ func (l genericResource) WithNewBase(base string) Resource {
 // for the template functions. See collections.Slice.
 func (commonResource) Slice(in interface{}) (interface{}, error) {
 	switch items := in.(type) {
-	case Resources:
+	case resource.Resources:
 		return items, nil
 	case []interface{}:
-		groups := make(Resources, len(items))
+		groups := make(resource.Resources, len(items))
 		for i, v := range items {
-			g, ok := v.(Resource)
+			g, ok := v.(resource.Resource)
 			if !ok {
 				return nil, fmt.Errorf("type %T is not a Resource", v)
 			}
@@ -903,7 +689,7 @@ func (r *Spec) newGenericResource(sourceFs afero.Fs,
 func (r *Spec) newGenericResourceWithBase(
 	sourceFs afero.Fs,
 	lazyPublish bool,
-	openReadSeekerCloser OpenReadSeekCloser,
+	openReadSeekerCloser resource.OpenReadSeekCloser,
 	urlBaseDir string,
 	targetPathBaseDirs []string,
 	targetPathBuilder func(base string) string,
diff --git a/resources/resource/resources.go b/resources/resource/resources.go
new file mode 100644
index 000000000..5c661c24e
--- /dev/null
+++ b/resources/resource/resources.go
@@ -0,0 +1,123 @@
+// Copyright 2019 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 resource
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/gohugoio/hugo/resources/internal"
+)
+
+// Resources represents a slice of resources, which can be a mix of different types.
+// I.e. both pages and images etc.
+type Resources []Resource
+
+// ResourcesConverter converts a given slice of Resource objects to Resources.
+type ResourcesConverter interface {
+	ToResources() Resources
+}
+
+// ByType returns resources of a given resource type (ie. "image").
+func (r Resources) ByType(tp string) Resources {
+	var filtered Resources
+
+	for _, resource := range r {
+		if resource.ResourceType() == tp {
+			filtered = append(filtered, resource)
+		}
+	}
+	return filtered
+}
+
+// GetMatch finds the first Resource matching the given pattern, or nil if none found.
+// See Match for a more complete explanation about the rules used.
+func (r Resources) GetMatch(pattern string) Resource {
+	g, err := internal.GetGlob(pattern)
+	if err != nil {
+		return nil
+	}
+
+	for _, resource := range r {
+		if g.Match(strings.ToLower(resource.Name())) {
+			return resource
+		}
+	}
+
+	return nil
+}
+
+// Match gets all resources matching the given base filename prefix, e.g
+// "*.png" will match all png files. The "*" does not match path delimiters (/),
+// so if you organize your resources in sub-folders, you need to be explicit about it, e.g.:
+// "images/*.png". To match any PNG image anywhere in the bundle you can do "**.png", and
+// to match all PNG images below the images folder, use "images/**.jpg".
+// The matching is case insensitive.
+// Match matches by using the value of Resource.Name, which, by default, is a filename with
+// path relative to the bundle root with Unix style slashes (/) and no leading slash, e.g. "images/logo.png".
+// See https://github.com/gobwas/glob for the full rules set.
+func (r Resources) Match(pattern string) Resources {
+	g, err := internal.GetGlob(pattern)
+	if err != nil {
+		return nil
+	}
+
+	var matches Resources
+	for _, resource := range r {
+		if g.Match(strings.ToLower(resource.Name())) {
+			matches = append(matches, resource)
+		}
+	}
+	return matches
+}
+
+type translatedResource interface {
+	TranslationKey() string
+}
+
+// MergeByLanguage adds missing translations in r1 from r2.
+func (r Resources) MergeByLanguage(r2 Resources) Resources {
+	result := append(Resources(nil), r...)
+	m := make(map[string]bool)
+	for _, rr := range r {
+		if translated, ok := rr.(translatedResource); ok {
+			m[translated.TranslationKey()] = true
+		}
+	}
+
+	for _, rr := range r2 {
+		if translated, ok := rr.(translatedResource); ok {
+			if _, found := m[translated.TranslationKey()]; !found {
+				result = append(result, rr)
+			}
+		}
+	}
+	return result
+}
+
+// MergeByLanguageInterface is the generic version of MergeByLanguage. It
+// is here just so it can be called from the tpl package.
+func (r Resources) MergeByLanguageInterface(in interface{}) (interface{}, error) {
+	r2, ok := in.(Resources)
+	if !ok {
+		return nil, fmt.Errorf("%T cannot be merged by language", in)
+	}
+	return r.MergeByLanguage(r2), nil
+}
+
+// Source is an internal template and not meant for use in the templates. It
+// may change without notice.
+type Source interface {
+	Publish() error
+}
diff --git a/resources/resource/resourcetypes.go b/resources/resource/resourcetypes.go
new file mode 100644
index 000000000..120d753e4
--- /dev/null
+++ b/resources/resource/resourcetypes.go
@@ -0,0 +1,106 @@
+// Copyright 2019 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 resource
+
+import (
+	"github.com/gohugoio/hugo/media"
+
+	"github.com/gohugoio/hugo/common/hugio"
+)
+
+// Cloner is an internal template and not meant for use in the templates. It
+// may change without notice.
+type Cloner interface {
+	WithNewBase(base string) Resource
+}
+
+// Resource represents a linkable resource, i.e. a content page, image etc.
+type Resource interface {
+	resourceBase
+
+	// Permalink represents the absolute link to this resource.
+	Permalink() string
+
+	// RelPermalink represents the host relative link to this resource.
+	RelPermalink() string
+
+	// ResourceType is the resource type. For most file types, this is the main
+	// part of the MIME type, e.g. "image", "application", "text" etc.
+	// For content pages, this value is "page".
+	ResourceType() string
+
+	// Name is the logical name of this resource. This can be set in the front matter
+	// metadata for this resource. If not set, Hugo will assign a value.
+	// This will in most cases be the base filename.
+	// So, for the image "/some/path/sunset.jpg" this will be "sunset.jpg".
+	// The value returned by this method will be used in the GetByPrefix and ByPrefix methods
+	// on Resources.
+	Name() string
+
+	// Title returns the title if set in front matter. For content pages, this will be the expected value.
+	Title() string
+
+	// Resource specific data set by Hugo.
+	// One example would be.Data.Digest for fingerprinted resources.
+	Data() interface{}
+
+	// Params set in front matter for this resource.
+	Params() map[string]interface{}
+}
+
+// resourceBase pulls out the minimal set of operations to define a Resource,
+// to simplify testing etc.
+type resourceBase interface {
+	// MediaType is this resource's MIME type.
+	MediaType() media.Type
+}
+
+// ResourcesLanguageMerger describes an interface for merging resources from a
+// different language.
+type ResourcesLanguageMerger interface {
+	MergeByLanguage(other Resources) Resources
+	// Needed for integration with the tpl package.
+	MergeByLanguageInterface(other interface{}) (interface{}, error)
+}
+
+// Identifier identifies a resource.
+type Identifier interface {
+	Key() string
+}
+
+// ContentResource represents a Resource that provides a way to get to its content.
+// Most Resource types in Hugo implements this interface, including Page.
+// This should be used with care, as it will read the file content into memory, but it
+// should be cached as effectively as possible by the implementation.
+type ContentResource interface {
+	resourceBase
+
+	// Content returns this resource's content. It will be equivalent to reading the content
+	// that RelPermalink points to in the published folder.
+	// The return type will be contextual, and should be what you would expect:
+	// * Page: template.HTML
+	// * JSON: String
+	// * Etc.
+	Content() (interface{}, error)
+}
+
+// OpenReadSeekCloser allows setting some other way (than reading from a filesystem)
+// to open or create a ReadSeekCloser.
+type OpenReadSeekCloser func() (hugio.ReadSeekCloser, error)
+
+// ReadSeekCloserResource is a Resource that supports loading its content.
+type ReadSeekCloserResource interface {
+	resourceBase
+	ReadSeekCloser() (hugio.ReadSeekCloser, error)
+}
diff --git a/resource/resource_cache.go b/resources/resource_cache.go
index e7c6ab6d0..8ff63beb0 100644
--- a/resource/resource_cache.go
+++ b/resources/resource_cache.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"encoding/json"
@@ -21,6 +21,8 @@ import (
 	"strings"
 	"sync"
 
+	"github.com/gohugoio/hugo/resources/resource"
+
 	"github.com/gohugoio/hugo/cache/filecache"
 
 	"github.com/BurntSushi/locker"
@@ -35,7 +37,7 @@ type ResourceCache struct {
 	rs *Spec
 
 	sync.RWMutex
-	cache map[string]Resource
+	cache map[string]resource.Resource
 
 	fileCache *filecache.Cache
 
@@ -59,7 +61,7 @@ func newResourceCache(rs *Spec) *ResourceCache {
 	return &ResourceCache{
 		rs:        rs,
 		fileCache: rs.FileCaches.AssetsCache(),
-		cache:     make(map[string]Resource),
+		cache:     make(map[string]resource.Resource),
 		nlocker:   locker.NewLocker(),
 	}
 }
@@ -68,7 +70,7 @@ func (c *ResourceCache) clear() {
 	c.Lock()
 	defer c.Unlock()
 
-	c.cache = make(map[string]Resource)
+	c.cache = make(map[string]resource.Resource)
 	c.nlocker = locker.NewLocker()
 }
 
@@ -82,14 +84,14 @@ func (c *ResourceCache) cleanKey(key string) string {
 	return strings.TrimPrefix(path.Clean(key), "/")
 }
 
-func (c *ResourceCache) get(key string) (Resource, bool) {
+func (c *ResourceCache) get(key string) (resource.Resource, bool) {
 	c.RLock()
 	defer c.RUnlock()
 	r, found := c.cache[key]
 	return r, found
 }
 
-func (c *ResourceCache) GetOrCreate(partition, key string, f func() (Resource, error)) (Resource, error) {
+func (c *ResourceCache) GetOrCreate(partition, key string, f func() (resource.Resource, error)) (resource.Resource, error) {
 	key = c.cleanKey(path.Join(partition, key))
 	// First check in-memory cache.
 	r, found := c.get(key)
@@ -172,7 +174,7 @@ func (c *ResourceCache) writeMeta(key string, meta transformedResourceMetadata)
 
 }
 
-func (c *ResourceCache) set(key string, r Resource) {
+func (c *ResourceCache) set(key string, r resource.Resource) {
 	c.Lock()
 	defer c.Unlock()
 	c.cache[key] = r
diff --git a/resource/resource_factories/bundler/bundler.go b/resources/resource_factories/bundler/bundler.go
index 70b8ee536..ca0ccf86e 100644
--- a/resource/resource_factories/bundler/bundler.go
+++ b/resources/resource_factories/bundler/bundler.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -21,17 +21,18 @@ import (
 
 	"github.com/gohugoio/hugo/common/hugio"
 	"github.com/gohugoio/hugo/media"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
+	"github.com/gohugoio/hugo/resources/resource"
 )
 
 // Client contains methods perform concatenation and other bundling related
 // tasks to Resource objects.
 type Client struct {
-	rs *resource.Spec
+	rs *resources.Spec
 }
 
 // New creates a new Client with the given specification.
-func New(rs *resource.Spec) *Client {
+func New(rs *resources.Spec) *Client {
 	return &Client{rs: rs}
 }
 
@@ -62,14 +63,14 @@ func (r *multiReadSeekCloser) Close() error {
 }
 
 // Concat concatenates the list of Resource objects.
-func (c *Client) Concat(targetPath string, resources resource.Resources) (resource.Resource, error) {
+func (c *Client) Concat(targetPath string, r resource.Resources) (resource.Resource, error) {
 	// The CACHE_OTHER will make sure this will be re-created and published on rebuilds.
-	return c.rs.ResourceCache.GetOrCreate(resource.CACHE_OTHER, targetPath, func() (resource.Resource, error) {
+	return c.rs.ResourceCache.GetOrCreate(resources.CACHE_OTHER, targetPath, func() (resource.Resource, error) {
 		var resolvedm media.Type
 
 		// The given set of resources must be of the same Media Type.
 		// We may improve on that in the future, but then we need to know more.
-		for i, r := range resources {
+		for i, r := range r {
 			if i > 0 && r.MediaType().Type() != resolvedm.Type() {
 				return nil, fmt.Errorf("resources in Concat must be of the same Media Type, got %q and %q", r.MediaType().Type(), resolvedm.Type())
 			}
@@ -78,7 +79,7 @@ func (c *Client) Concat(targetPath string, resources resource.Resources) (resour
 
 		concatr := func() (hugio.ReadSeekCloser, error) {
 			var rcsources []hugio.ReadSeekCloser
-			for _, s := range resources {
+			for _, s := range r {
 				rcr, ok := s.(resource.ReadSeekCloserResource)
 				if !ok {
 					return nil, fmt.Errorf("resource %T does not implement resource.ReadSeekerCloserResource", s)
@@ -106,7 +107,7 @@ func (c *Client) Concat(targetPath string, resources resource.Resources) (resour
 
 		composite, err := c.rs.NewForFs(
 			c.rs.FileCaches.AssetsCache().Fs,
-			resource.ResourceSourceDescriptor{
+			resources.ResourceSourceDescriptor{
 				LazyPublish:        true,
 				OpenReadSeekCloser: concatr,
 				RelTargetFilename:  filepath.Clean(targetPath)})
diff --git a/resource/resource_factories/create/create.go b/resources/resource_factories/create/create.go
index db23930e4..dc565056d 100644
--- a/resource/resource_factories/create/create.go
+++ b/resources/resource_factories/create/create.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -21,26 +21,27 @@ import (
 	"github.com/spf13/afero"
 
 	"github.com/gohugoio/hugo/common/hugio"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
+	"github.com/gohugoio/hugo/resources/resource"
 )
 
 // Client contains methods to create Resource objects.
 // tasks to Resource objects.
 type Client struct {
-	rs *resource.Spec
+	rs *resources.Spec
 }
 
 // New creates a new Client with the given specification.
-func New(rs *resource.Spec) *Client {
+func New(rs *resources.Spec) *Client {
 	return &Client{rs: rs}
 }
 
 // Get creates a new Resource by opening the given filename in the given filesystem.
 func (c *Client) Get(fs afero.Fs, filename string) (resource.Resource, error) {
 	filename = filepath.Clean(filename)
-	return c.rs.ResourceCache.GetOrCreate(resource.ResourceKeyPartition(filename), filename, func() (resource.Resource, error) {
+	return c.rs.ResourceCache.GetOrCreate(resources.ResourceKeyPartition(filename), filename, func() (resource.Resource, error) {
 		return c.rs.NewForFs(fs,
-			resource.ResourceSourceDescriptor{
+			resources.ResourceSourceDescriptor{
 				LazyPublish:    true,
 				SourceFilename: filename})
 	})
@@ -49,10 +50,10 @@ func (c *Client) Get(fs afero.Fs, filename string) (resource.Resource, error) {
 
 // FromString creates a new Resource from a string with the given relative target path.
 func (c *Client) FromString(targetPath, content string) (resource.Resource, error) {
-	return c.rs.ResourceCache.GetOrCreate(resource.CACHE_OTHER, targetPath, func() (resource.Resource, error) {
+	return c.rs.ResourceCache.GetOrCreate(resources.CACHE_OTHER, targetPath, func() (resource.Resource, error) {
 		return c.rs.NewForFs(
 			c.rs.FileCaches.AssetsCache().Fs,
-			resource.ResourceSourceDescriptor{
+			resources.ResourceSourceDescriptor{
 				LazyPublish: true,
 				OpenReadSeekCloser: func() (hugio.ReadSeekCloser, error) {
 					return hugio.NewReadSeekerNoOpCloserFromString(content), nil
diff --git a/resource/resource_metadata.go b/resources/resource_metadata.go
index 20c4f130b..0830dfc59 100644
--- a/resource/resource_metadata.go
+++ b/resources/resource_metadata.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,12 +11,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"fmt"
 	"strconv"
 
+	"github.com/gohugoio/hugo/resources/internal"
+	"github.com/gohugoio/hugo/resources/resource"
+
 	"github.com/pkg/errors"
 	"github.com/spf13/cast"
 
@@ -43,7 +46,7 @@ const counterPlaceHolder = ":counter"
 // This assignment is additive, but the most specific match needs to be first.
 // The `name` and `title` metadata field support shell-matched collection it got a match in.
 // See https://golang.org/pkg/path/#Match
-func AssignMetadata(metadata []map[string]interface{}, resources ...Resource) error {
+func AssignMetadata(metadata []map[string]interface{}, resources ...resource.Resource) error {
 
 	counters := make(map[string]int)
 
@@ -68,7 +71,7 @@ func AssignMetadata(metadata []map[string]interface{}, resources ...Resource) er
 
 			srcKey := strings.ToLower(cast.ToString(src))
 
-			glob, err := getGlob(srcKey)
+			glob, err := internal.GetGlob(srcKey)
 			if err != nil {
 				return errors.Wrap(err, "failed to match resource with metadata")
 			}
diff --git a/resource/resource_metadata_test.go b/resources/resource_metadata_test.go
index 85fb25b57..a1a2a738c 100644
--- a/resource/resource_metadata_test.go
+++ b/resources/resource_metadata_test.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,12 +11,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"testing"
 
 	"github.com/gohugoio/hugo/media"
+	"github.com/gohugoio/hugo/resources/resource"
 
 	"github.com/stretchr/testify/require"
 )
@@ -25,8 +26,8 @@ func TestAssignMetadata(t *testing.T) {
 	assert := require.New(t)
 	spec := newTestResourceSpec(assert)
 
-	var foo1, foo2, foo3, logo1, logo2, logo3 Resource
-	var resources Resources
+	var foo1, foo2, foo3, logo1, logo2, logo3 resource.Resource
+	var resources resource.Resources
 
 	for _, this := range []struct {
 		metaData   []map[string]interface{}
@@ -215,7 +216,7 @@ func TestAssignMetadata(t *testing.T) {
 		foo3 = spec.newGenericResource(nil, nil, nil, "/b/foo3.css", "foo3.css", media.CSSType)
 		logo3 = spec.newGenericResource(nil, nil, nil, "/b/logo3.png", "logo3.png", pngType)
 
-		resources = Resources{
+		resources = resource.Resources{
 			foo2,
 			logo2,
 			foo1,
diff --git a/resource/resource_test.go b/resources/resource_test.go
index b3f6035b6..be2706e45 100644
--- a/resource/resource_test.go
+++ b/resources/resource_test.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"fmt"
@@ -22,6 +22,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/gohugoio/hugo/resources/resource"
+
 	"github.com/gohugoio/hugo/media"
 
 	"github.com/stretchr/testify/require"
@@ -75,7 +77,7 @@ func TestNewResourceFromFilename(t *testing.T) {
 	assert.NotNil(r)
 	assert.Equal("json", r.ResourceType())
 
-	cloned := r.(Cloner).WithNewBase("aceof")
+	cloned := r.(resource.Cloner).WithNewBase("aceof")
 	assert.Equal(r.ResourceType(), cloned.ResourceType())
 	assert.Equal("/aceof/a/b/data.json", cloned.RelPermalink())
 }
@@ -103,7 +105,7 @@ var pngType, _ = media.FromStringAndExt("image/png", "png")
 func TestResourcesByType(t *testing.T) {
 	assert := require.New(t)
 	spec := newTestResourceSpec(assert)
-	resources := Resources{
+	resources := resource.Resources{
 		spec.newGenericResource(nil, nil, nil, "/a/foo1.css", "foo1.css", media.CSSType),
 		spec.newGenericResource(nil, nil, nil, "/a/logo.png", "logo.css", pngType),
 		spec.newGenericResource(nil, nil, nil, "/a/foo2.css", "foo2.css", media.CSSType),
@@ -117,7 +119,7 @@ func TestResourcesByType(t *testing.T) {
 func TestResourcesGetByPrefix(t *testing.T) {
 	assert := require.New(t)
 	spec := newTestResourceSpec(assert)
-	resources := Resources{
+	resources := resource.Resources{
 		spec.newGenericResource(nil, nil, nil, "/a/foo1.css", "foo1.css", media.CSSType),
 		spec.newGenericResource(nil, nil, nil, "/a/logo1.png", "logo1.png", pngType),
 		spec.newGenericResource(nil, nil, nil, "/b/Logo2.png", "Logo2.png", pngType),
@@ -146,7 +148,7 @@ func TestResourcesGetByPrefix(t *testing.T) {
 func TestResourcesGetMatch(t *testing.T) {
 	assert := require.New(t)
 	spec := newTestResourceSpec(assert)
-	resources := Resources{
+	resources := resource.Resources{
 		spec.newGenericResource(nil, nil, nil, "/a/foo1.css", "foo1.css", media.CSSType),
 		spec.newGenericResource(nil, nil, nil, "/a/logo1.png", "logo1.png", pngType),
 		spec.newGenericResource(nil, nil, nil, "/b/Logo2.png", "Logo2.png", pngType),
@@ -211,7 +213,7 @@ func BenchmarkResourcesMatchA100(b *testing.B) {
 	a100 := strings.Repeat("a", 100)
 	pattern := "a*a*a*a*a*a*a*a*b"
 
-	resources := Resources{spec.newGenericResource(nil, nil, nil, "/a/"+a100, a100, media.CSSType)}
+	resources := resource.Resources{spec.newGenericResource(nil, nil, nil, "/a/"+a100, a100, media.CSSType)}
 
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
@@ -220,10 +222,10 @@ func BenchmarkResourcesMatchA100(b *testing.B) {
 
 }
 
-func benchResources(b *testing.B) Resources {
+func benchResources(b *testing.B) resource.Resources {
 	assert := require.New(b)
 	spec := newTestResourceSpec(assert)
-	var resources Resources
+	var resources resource.Resources
 
 	for i := 0; i < 30; i++ {
 		name := fmt.Sprintf("abcde%d_%d.css", i%5, i)
@@ -250,7 +252,7 @@ func BenchmarkAssignMetadata(b *testing.B) {
 
 	for i := 0; i < b.N; i++ {
 		b.StopTimer()
-		var resources Resources
+		var resources resource.Resources
 		var meta = []map[string]interface{}{
 			{
 				"title": "Foo #:counter",
diff --git a/resource/resource_transformers/integrity/integrity.go b/resources/resource_transformers/integrity/integrity.go
index 535c06a32..90afafb88 100644
--- a/resource/resource_transformers/integrity/integrity.go
+++ b/resources/resource_transformers/integrity/integrity.go
@@ -24,7 +24,8 @@ import (
 	"html/template"
 	"io"
 
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
+	"github.com/gohugoio/hugo/resources/resource"
 )
 
 const defaultHashAlgo = "sha256"
@@ -32,11 +33,11 @@ const defaultHashAlgo = "sha256"
 // Client contains methods to fingerprint (cachebusting) and other integrity-related
 // methods.
 type Client struct {
-	rs *resource.Spec
+	rs *resources.Spec
 }
 
 // New creates a new Client with the given specification.
-func New(rs *resource.Spec) *Client {
+func New(rs *resources.Spec) *Client {
 	return &Client{rs: rs}
 }
 
@@ -44,13 +45,13 @@ type fingerprintTransformation struct {
 	algo string
 }
 
-func (t *fingerprintTransformation) Key() resource.ResourceTransformationKey {
-	return resource.NewResourceTransformationKey("fingerprint", t.algo)
+func (t *fingerprintTransformation) Key() resources.ResourceTransformationKey {
+	return resources.NewResourceTransformationKey("fingerprint", t.algo)
 }
 
 // Transform creates a MD5 hash of the Resource content and inserts that hash before
 // the extension in the filename.
-func (t *fingerprintTransformation) Transform(ctx *resource.ResourceTransformationCtx) error {
+func (t *fingerprintTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
 	algo := t.algo
 
 	var h hash.Hash
diff --git a/resource/resource_transformers/minifier/minify.go b/resources/resource_transformers/minifier/minify.go
index cef22efc0..952c6a99c 100644
--- a/resource/resource_transformers/minifier/minify.go
+++ b/resources/resource_transformers/minifier/minify.go
@@ -15,32 +15,33 @@ package minifier
 
 import (
 	"github.com/gohugoio/hugo/minifiers"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
+	"github.com/gohugoio/hugo/resources/resource"
 )
 
 // Client for minification of Resource objects. Supported minfiers are:
 // css, html, js, json, svg and xml.
 type Client struct {
-	rs *resource.Spec
+	rs *resources.Spec
 	m  minifiers.Client
 }
 
 // New creates a new Client given a specification. Note that it is the media types
 // configured for the site that is used to match files to the correct minifier.
-func New(rs *resource.Spec) *Client {
+func New(rs *resources.Spec) *Client {
 	return &Client{rs: rs, m: minifiers.New(rs.MediaTypes, rs.OutputFormats)}
 }
 
 type minifyTransformation struct {
-	rs *resource.Spec
+	rs *resources.Spec
 	m  minifiers.Client
 }
 
-func (t *minifyTransformation) Key() resource.ResourceTransformationKey {
-	return resource.NewResourceTransformationKey("minify")
+func (t *minifyTransformation) Key() resources.ResourceTransformationKey {
+	return resources.NewResourceTransformationKey("minify")
 }
 
-func (t *minifyTransformation) Transform(ctx *resource.ResourceTransformationCtx) error {
+func (t *minifyTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
 	if err := t.m.Minify(ctx.InMediaType, ctx.To, ctx.From); err != nil {
 		return err
 	}
diff --git a/resource/resource_transformers/postcss/postcss.go b/resources/resource_transformers/postcss/postcss.go
index ec73543dd..5350eebc5 100644
--- a/resource/resource_transformers/postcss/postcss.go
+++ b/resources/resource_transformers/postcss/postcss.go
@@ -26,7 +26,8 @@ import (
 	"github.com/mitchellh/mapstructure"
 
 	"github.com/gohugoio/hugo/common/herrors"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
+	"github.com/gohugoio/hugo/resources/resource"
 )
 
 // Some of the options from https://github.com/postcss/postcss-cli
@@ -74,28 +75,28 @@ func (opts Options) toArgs() []string {
 
 // Client is the client used to do PostCSS transformations.
 type Client struct {
-	rs *resource.Spec
+	rs *resources.Spec
 }
 
 // New creates a new Client with the given specification.
-func New(rs *resource.Spec) *Client {
+func New(rs *resources.Spec) *Client {
 	return &Client{rs: rs}
 }
 
 type postcssTransformation struct {
 	options Options
-	rs      *resource.Spec
+	rs      *resources.Spec
 }
 
-func (t *postcssTransformation) Key() resource.ResourceTransformationKey {
-	return resource.NewResourceTransformationKey("postcss", t.options)
+func (t *postcssTransformation) Key() resources.ResourceTransformationKey {
+	return resources.NewResourceTransformationKey("postcss", t.options)
 }
 
 // Transform shells out to postcss-cli to do the heavy lifting.
 // For this to work, you need some additional tools. To install them globally:
 // npm install -g postcss-cli
 // npm install -g autoprefixer
-func (t *postcssTransformation) Transform(ctx *resource.ResourceTransformationCtx) error {
+func (t *postcssTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
 
 	const localPostCSSPath = "node_modules/postcss-cli/bin/"
 	const binaryName = "postcss"
diff --git a/resource/resource_transformers/templates/execute_as_template.go b/resources/resource_transformers/templates/execute_as_template.go
index a126b26c9..b3ec3cf43 100644
--- a/resource/resource_transformers/templates/execute_as_template.go
+++ b/resources/resource_transformers/templates/execute_as_template.go
@@ -16,20 +16,21 @@ package templates
 
 import (
 	"github.com/gohugoio/hugo/helpers"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
+	"github.com/gohugoio/hugo/resources/resource"
 	"github.com/gohugoio/hugo/tpl"
 	"github.com/pkg/errors"
 )
 
 // Client contains methods to perform template processing of Resource objects.
 type Client struct {
-	rs *resource.Spec
+	rs *resources.Spec
 
 	textTemplate tpl.TemplateParseFinder
 }
 
 // New creates a new Client with the given specification.
-func New(rs *resource.Spec, textTemplate tpl.TemplateParseFinder) *Client {
+func New(rs *resources.Spec, textTemplate tpl.TemplateParseFinder) *Client {
 	if rs == nil {
 		panic("must provice a resource Spec")
 	}
@@ -40,17 +41,17 @@ func New(rs *resource.Spec, textTemplate tpl.TemplateParseFinder) *Client {
 }
 
 type executeAsTemplateTransform struct {
-	rs           *resource.Spec
+	rs           *resources.Spec
 	textTemplate tpl.TemplateParseFinder
 	targetPath   string
 	data         interface{}
 }
 
-func (t *executeAsTemplateTransform) Key() resource.ResourceTransformationKey {
-	return resource.NewResourceTransformationKey("execute-as-template", t.targetPath)
+func (t *executeAsTemplateTransform) Key() resources.ResourceTransformationKey {
+	return resources.NewResourceTransformationKey("execute-as-template", t.targetPath)
 }
 
-func (t *executeAsTemplateTransform) Transform(ctx *resource.ResourceTransformationCtx) error {
+func (t *executeAsTemplateTransform) Transform(ctx *resources.ResourceTransformationCtx) error {
 	tplStr := helpers.ReaderToString(ctx.From)
 	templ, err := t.textTemplate.Parse(ctx.InPath, tplStr)
 	if err != nil {
diff --git a/resource/resource_transformers/tocss/scss/client.go b/resources/resource_transformers/tocss/scss/client.go
index 126727e06..41ff67433 100644
--- a/resource/resource_transformers/tocss/scss/client.go
+++ b/resources/resource_transformers/tocss/scss/client.go
@@ -17,17 +17,19 @@ import (
 	"github.com/bep/go-tocss/scss"
 	"github.com/gohugoio/hugo/helpers"
 	"github.com/gohugoio/hugo/hugolib/filesystems"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
+	"github.com/gohugoio/hugo/resources/resource"
+
 	"github.com/mitchellh/mapstructure"
 )
 
 type Client struct {
-	rs     *resource.Spec
+	rs     *resources.Spec
 	sfs    *filesystems.SourceFilesystem
 	workFs *filesystems.SourceFilesystem
 }
 
-func New(fs *filesystems.SourceFilesystem, rs *resource.Spec) (*Client, error) {
+func New(fs *filesystems.SourceFilesystem, rs *resources.Spec) (*Client, error) {
 	return &Client{sfs: fs, workFs: rs.BaseFs.Work, rs: rs}, nil
 }
 
@@ -91,8 +93,8 @@ type toCSSTransformation struct {
 	options options
 }
 
-func (t *toCSSTransformation) Key() resource.ResourceTransformationKey {
-	return resource.NewResourceTransformationKey("tocss", t.options.from)
+func (t *toCSSTransformation) Key() resources.ResourceTransformationKey {
+	return resources.NewResourceTransformationKey("tocss", t.options.from)
 }
 
 func DecodeOptions(m map[string]interface{}) (opts Options, err error) {
diff --git a/resource/resource_transformers/tocss/scss/tocss.go b/resources/resource_transformers/tocss/scss/tocss.go
index 984e14fc2..17c32ea8e 100644
--- a/resource/resource_transformers/tocss/scss/tocss.go
+++ b/resources/resource_transformers/tocss/scss/tocss.go
@@ -28,7 +28,7 @@ import (
 	"github.com/gohugoio/hugo/helpers"
 	"github.com/gohugoio/hugo/hugofs"
 	"github.com/gohugoio/hugo/media"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
 	"github.com/pkg/errors"
 )
 
@@ -37,7 +37,7 @@ func Supports() bool {
 	return true
 }
 
-func (t *toCSSTransformation) Transform(ctx *resource.ResourceTransformationCtx) error {
+func (t *toCSSTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
 	ctx.OutMediaType = media.CSSType
 
 	var outName string
diff --git a/resource/resource_transformers/tocss/scss/tocss_notavailable.go b/resources/resource_transformers/tocss/scss/tocss_notavailable.go
index df918b368..ad6b42b98 100644
--- a/resource/resource_transformers/tocss/scss/tocss_notavailable.go
+++ b/resources/resource_transformers/tocss/scss/tocss_notavailable.go
@@ -17,7 +17,7 @@ package scss
 
 import (
 	"github.com/gohugoio/hugo/common/herrors"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources"
 )
 
 // Used in tests.
@@ -25,6 +25,6 @@ func Supports() bool {
 	return false
 }
 
-func (t *toCSSTransformation) Transform(ctx *resource.ResourceTransformationCtx) error {
+func (t *toCSSTransformation) Transform(ctx *resources.ResourceTransformationCtx) error {
 	return herrors.ErrFeatureNotAvailable
 }
diff --git a/resource/smartcrop.go b/resources/smartcrop.go
index 201262436..05bc55cd7 100644
--- a/resource/smartcrop.go
+++ b/resources/smartcrop.go
@@ -1,4 +1,4 @@
-// Copyright 2017-present The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"image"
diff --git a/resource/testdata/1234567890qwertyuiopasdfghjklzxcvbnm5to6eeeeee7via8eleph.jpg b/resources/testdata/1234567890qwertyuiopasdfghjklzxcvbnm5to6eeeeee7via8eleph.jpg
index 7d7307bed..7d7307bed 100644
--- a/resource/testdata/1234567890qwertyuiopasdfghjklzxcvbnm5to6eeeeee7via8eleph.jpg
+++ b/resources/testdata/1234567890qwertyuiopasdfghjklzxcvbnm5to6eeeeee7via8eleph.jpg
diff --git a/resource/testdata/circle.svg b/resources/testdata/circle.svg
index 2759ae703..2759ae703 100644
--- a/resource/testdata/circle.svg
+++ b/resources/testdata/circle.svg
diff --git a/resource/testdata/gohugoio.png b/resources/testdata/gohugoio.png
index 0591db959..0591db959 100644
--- a/resource/testdata/gohugoio.png
+++ b/resources/testdata/gohugoio.png
diff --git a/resource/testdata/sub/gohugoio2.png b/resources/testdata/sub/gohugoio2.png
index 0591db959..0591db959 100644
--- a/resource/testdata/sub/gohugoio2.png
+++ b/resources/testdata/sub/gohugoio2.png
diff --git a/resource/testdata/sunset.jpg b/resources/testdata/sunset.jpg
index 7d7307bed..7d7307bed 100644
--- a/resource/testdata/sunset.jpg
+++ b/resources/testdata/sunset.jpg
diff --git a/resource/testhelpers_test.go b/resources/testhelpers_test.go
index 55833bafa..d0fcb59e7 100644
--- a/resource/testhelpers_test.go
+++ b/resources/testhelpers_test.go
@@ -1,4 +1,4 @@
-package resource
+package resources
 
 import (
 	"path/filepath"
@@ -18,6 +18,7 @@ import (
 	"github.com/gohugoio/hugo/hugofs"
 	"github.com/gohugoio/hugo/media"
 	"github.com/gohugoio/hugo/output"
+	"github.com/gohugoio/hugo/resources/resource"
 	"github.com/spf13/afero"
 	"github.com/spf13/viper"
 	"github.com/stretchr/testify/require"
@@ -112,7 +113,7 @@ func fetchImageForSpec(spec *Spec, assert *require.Assertions, name string) *Ima
 	return r.(*Image)
 }
 
-func fetchResourceForSpec(spec *Spec, assert *require.Assertions, name string) ContentResource {
+func fetchResourceForSpec(spec *Spec, assert *require.Assertions, name string) resource.ContentResource {
 	src, err := os.Open(filepath.FromSlash("testdata/" + name))
 	assert.NoError(err)
 
@@ -130,7 +131,7 @@ func fetchResourceForSpec(spec *Spec, assert *require.Assertions, name string) C
 	r, err := spec.New(ResourceSourceDescriptor{TargetPathBuilder: factory, SourceFilename: name})
 	assert.NoError(err)
 
-	return r.(ContentResource)
+	return r.(resource.ContentResource)
 }
 
 func assertImageFile(assert *require.Assertions, fs afero.Fs, filename string, width, height int) {
diff --git a/resource/transform.go b/resources/transform.go
index bd59d0658..fd3ae1ae6 100644
--- a/resource/transform.go
+++ b/resources/transform.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"bytes"
@@ -23,6 +23,7 @@ import (
 	"github.com/gohugoio/hugo/common/herrors"
 	"github.com/gohugoio/hugo/common/hugio"
 	"github.com/gohugoio/hugo/helpers"
+	"github.com/gohugoio/hugo/resources/resource"
 	"github.com/mitchellh/hashstructure"
 
 	"fmt"
@@ -35,13 +36,13 @@ import (
 )
 
 var (
-	_ ContentResource        = (*transformedResource)(nil)
-	_ ReadSeekCloserResource = (*transformedResource)(nil)
-	_ collections.Slicer     = (*transformedResource)(nil)
-	_ Identifier             = (*transformedResource)(nil)
+	_ resource.ContentResource        = (*transformedResource)(nil)
+	_ resource.ReadSeekCloserResource = (*transformedResource)(nil)
+	_ collections.Slicer              = (*transformedResource)(nil)
+	_ resource.Identifier             = (*transformedResource)(nil)
 )
 
-func (s *Spec) Transform(r Resource, t ResourceTransformation) (Resource, error) {
+func (s *Spec) Transform(r resource.Resource, t ResourceTransformation) (resource.Resource, error) {
 	return &transformedResource{
 		Resource:                    r,
 		transformation:              t,
@@ -195,7 +196,7 @@ type transformedResource struct {
 	transformedResourceMetadata
 
 	// The source
-	Resource
+	resource.Resource
 }
 
 func (r *transformedResource) ReadSeekCloser() (hugio.ReadSeekCloser, error) {
@@ -292,11 +293,11 @@ func (r *transformedResource) transform(setContent, publish bool) (err error) {
 
 	// This can be the last resource in a chain.
 	// Rewind and create a processing chain.
-	var chain []Resource
+	var chain []resource.Resource
 	current := r
 	for {
 		rr := current.Resource
-		chain = append(chain[:0], append([]Resource{rr}, chain[0:]...)...)
+		chain = append(chain[:0], append([]resource.Resource{rr}, chain[0:]...)...)
 		if tr, ok := rr.(*transformedResource); ok {
 			current = tr
 		} else {
@@ -538,9 +539,9 @@ func (r *transformedResource) initTransform(setContent, publish bool) error {
 }
 
 // contentReadSeekerCloser returns a ReadSeekerCloser if possible for a given Resource.
-func contentReadSeekerCloser(r Resource) (hugio.ReadSeekCloser, error) {
+func contentReadSeekerCloser(r resource.Resource) (hugio.ReadSeekCloser, error) {
 	switch rr := r.(type) {
-	case ReadSeekCloserResource:
+	case resource.ReadSeekCloserResource:
 		rc, err := rr.ReadSeekCloser()
 		if err != nil {
 			return nil, err
diff --git a/resource/transform_test.go b/resources/transform_test.go
index df68e780d..ed462cd2a 100644
--- a/resource/transform_test.go
+++ b/resources/transform_test.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -11,7 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package resource
+package resources
 
 import (
 	"testing"
diff --git a/tpl/resources/resources.go b/tpl/resources/resources.go
index 497611b75..d32e12a05 100644
--- a/tpl/resources/resources.go
+++ b/tpl/resources/resources.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -22,14 +22,14 @@ import (
 	_errors "github.com/pkg/errors"
 
 	"github.com/gohugoio/hugo/deps"
-	"github.com/gohugoio/hugo/resource"
-	"github.com/gohugoio/hugo/resource/resource_factories/bundler"
-	"github.com/gohugoio/hugo/resource/resource_factories/create"
-	"github.com/gohugoio/hugo/resource/resource_transformers/integrity"
-	"github.com/gohugoio/hugo/resource/resource_transformers/minifier"
-	"github.com/gohugoio/hugo/resource/resource_transformers/postcss"
-	"github.com/gohugoio/hugo/resource/resource_transformers/templates"
-	"github.com/gohugoio/hugo/resource/resource_transformers/tocss/scss"
+	"github.com/gohugoio/hugo/resources/resource"
+	"github.com/gohugoio/hugo/resources/resource_factories/bundler"
+	"github.com/gohugoio/hugo/resources/resource_factories/create"
+	"github.com/gohugoio/hugo/resources/resource_transformers/integrity"
+	"github.com/gohugoio/hugo/resources/resource_transformers/minifier"
+	"github.com/gohugoio/hugo/resources/resource_transformers/postcss"
+	"github.com/gohugoio/hugo/resources/resource_transformers/templates"
+	"github.com/gohugoio/hugo/resources/resource_transformers/tocss/scss"
 	"github.com/spf13/cast"
 )
 
diff --git a/tpl/transform/unmarshal.go b/tpl/transform/unmarshal.go
index c27a21a9e..da06b6aa1 100644
--- a/tpl/transform/unmarshal.go
+++ b/tpl/transform/unmarshal.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -21,7 +21,7 @@ import (
 
 	"github.com/gohugoio/hugo/helpers"
 	"github.com/gohugoio/hugo/parser/metadecoders"
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources/resource"
 	"github.com/pkg/errors"
 
 	"github.com/spf13/cast"
diff --git a/tpl/transform/unmarshal_test.go b/tpl/transform/unmarshal_test.go
index d9ebd1f89..1defe8c9c 100644
--- a/tpl/transform/unmarshal_test.go
+++ b/tpl/transform/unmarshal_test.go
@@ -1,4 +1,4 @@
-// Copyright 2018 The Hugo Authors. All rights reserved.
+// Copyright 2019 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.
@@ -23,7 +23,7 @@ import (
 
 	"github.com/gohugoio/hugo/media"
 
-	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resources/resource"
 	"github.com/spf13/viper"
 	"github.com/stretchr/testify/require"
 )