Add Hugo Piper with SCSS support and much more

Before this commit, you would have to use page bundles to do image processing etc. in Hugo.

This commit adds

* A new `/assets` top-level project or theme dir (configurable via `assetDir`)
* A new template func, `resources.Get` which can be used to "get a resource" that can be further processed.

This means that you can now do this in your templates (or shortcodes):

```bash
{{ $sunset := (resources.Get "images/sunset.jpg").Fill "300x200" }}
```

This also adds a new `extended` build tag that enables powerful SCSS/SASS support with source maps. To compile this from source, you will also need a C compiler installed:

```
HUGO_BUILD_TAGS=extended mage install
```

Note that you can use output of the SCSS processing later in a non-SCSSS-enabled Hugo.

The `SCSS` processor is a _Resource transformation step_ and it can be chained with the many others in a pipeline:

```bash
{{ $css := resources.Get "styles.scss" | resources.ToCSS | resources.PostCSS | resources.Minify | resources.Fingerprint }}
<link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Digest }}" media="screen">
```

The transformation funcs above have aliases, so it can be shortened to:

```bash
{{ $css := resources.Get "styles.scss" | toCSS | postCSS | minify | fingerprint }}
<link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Digest }}" media="screen">
```

A quick tip would be to avoid the fingerprinting part, and possibly also the not-superfast `postCSS` when you're doing development, as it allows Hugo to be smarter about the rebuilding.

Documentation will follow, but have a look at the demo repo in https://github.com/bep/hugo-sass-test

New functions to create `Resource` objects:

* `resources.Get` (see above)
* `resources.FromString`: Create a Resource from a string.

New `Resource` transformation funcs:

* `resources.ToCSS`: Compile `SCSS` or `SASS` into `CSS`.
* `resources.PostCSS`: Process your CSS with PostCSS. Config file support (project or theme or passed as an option).
* `resources.Minify`: Currently supports `css`, `js`, `json`, `html`, `svg`, `xml`.
* `resources.Fingerprint`: Creates a fingerprinted version of the given Resource with Subresource Integrity..
* `resources.Concat`: Concatenates a list of Resource objects. Think of this as a poor man's bundler.
* `resources.ExecuteAsTemplate`: Parses and executes the given Resource and data context (e.g. .Site) as a Go template.

Fixes #4381
Fixes #4903
Fixes #4858

13 files changed, 452 insertions, 48 deletions

diff --git a/tpl/collections/apply_test.go b/tpl/collections/apply_test.go
index de24b06c8..0878844b2 100644
--- a/tpl/collections/apply_test.go
+++ b/tpl/collections/apply_test.go
@@ -25,8 +25,8 @@ import (
 
 type templateFinder int
 
-func (templateFinder) Lookup(name string) *tpl.TemplateAdapter {
-	return nil
+func (templateFinder) Lookup(name string) (tpl.Template, bool) {
+	return nil, false
 }
 
 func (templateFinder) GetFuncs() map[string]interface{} {
diff --git a/tpl/os/init.go b/tpl/os/init.go
index 012f43b1f..3ef8702d6 100644
--- a/tpl/os/init.go
+++ b/tpl/os/init.go
@@ -37,14 +37,14 @@ func init() {
 		ns.AddMethodMapping(ctx.ReadDir,
 			[]string{"readDir"},
 			[][2]string{
-				{`{{ range (readDir ".") }}{{ .Name }}{{ end }}`, "README.txt"},
+				{`{{ range (readDir "files") }}{{ .Name }}{{ end }}`, "README.txt"},
 			},
 		)
 
 		ns.AddMethodMapping(ctx.ReadFile,
 			[]string{"readFile"},
 			[][2]string{
-				{`{{ readFile "README.txt" }}`, `Hugo Rocks!`},
+				{`{{ readFile "files/README.txt" }}`, `Hugo Rocks!`},
 			},
 		)
 
diff --git a/tpl/os/os.go b/tpl/os/os.go
index f7f9537ff..79d035d7e 100644
--- a/tpl/os/os.go
+++ b/tpl/os/os.go
@@ -34,7 +34,7 @@ func New(deps *deps.Deps) *Namespace {
 	if deps.Fs != nil {
 		rfs = deps.Fs.WorkingDir
 		if deps.PathSpec != nil && deps.PathSpec.BaseFs != nil {
-			rfs = afero.NewReadOnlyFs(afero.NewCopyOnWriteFs(deps.PathSpec.BaseFs.ContentFs, deps.Fs.WorkingDir))
+			rfs = afero.NewReadOnlyFs(afero.NewCopyOnWriteFs(deps.PathSpec.BaseFs.Content.Fs, deps.Fs.WorkingDir))
 		}
 	}
 
diff --git a/tpl/partials/partials.go b/tpl/partials/partials.go
index beb09f426..18b8d7ed6 100644
--- a/tpl/partials/partials.go
+++ b/tpl/partials/partials.go
@@ -63,12 +63,13 @@ func (ns *Namespace) Include(name string, contextList ...interface{}) (interface
 	}
 
 	for _, n := range []string{"partials/" + name, "theme/partials/" + name} {
-		templ := ns.deps.Tmpl.Lookup(n)
-		if templ == nil {
+		templ, found := ns.deps.Tmpl.Lookup(n)
+
+		if !found {
 			// For legacy reasons.
-			templ = ns.deps.Tmpl.Lookup(n + ".html")
+			templ, found = ns.deps.Tmpl.Lookup(n + ".html")
 		}
-		if templ != nil {
+		if found {
 			b := bp.GetBuffer()
 			defer bp.PutBuffer(b)
 
@@ -76,7 +77,7 @@ func (ns *Namespace) Include(name string, contextList ...interface{}) (interface
 				return "", err
 			}
 
-			if _, ok := templ.Template.(*texttemplate.Template); ok {
+			if _, ok := templ.(*texttemplate.Template); ok {
 				s := b.String()
 				if ns.deps.Metrics != nil {
 					ns.deps.Metrics.TrackValue(n, s)
diff --git a/tpl/resources/init.go b/tpl/resources/init.go
new file mode 100644
index 000000000..3e750f325
--- /dev/null
+++ b/tpl/resources/init.go
@@ -0,0 +1,68 @@
+// Copyright 2018 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 resources
+
+import (
+	"github.com/gohugoio/hugo/deps"
+	"github.com/gohugoio/hugo/tpl/internal"
+)
+
+const name = "resources"
+
+func init() {
+	f := func(d *deps.Deps) *internal.TemplateFuncsNamespace {
+		ctx, err := New(d)
+		if err != nil {
+			// TODO(bep) no panic.
+			panic(err)
+		}
+
+		ns := &internal.TemplateFuncsNamespace{
+			Name:    name,
+			Context: func(args ...interface{}) interface{} { return ctx },
+		}
+
+		ns.AddMethodMapping(ctx.Get,
+			nil,
+			[][2]string{},
+		)
+
+		// Add aliases for the most common transformations.
+
+		ns.AddMethodMapping(ctx.Fingerprint,
+			[]string{"fingerprint"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.Minify,
+			[]string{"minify"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.ToCSS,
+			[]string{"toCSS"},
+			[][2]string{},
+		)
+
+		ns.AddMethodMapping(ctx.PostCSS,
+			[]string{"postCSS"},
+			[][2]string{},
+		)
+
+		return ns
+
+	}
+
+	internal.AddTemplateFuncsNamespace(f)
+}
diff --git a/tpl/resources/resources.go b/tpl/resources/resources.go
new file mode 100644
index 000000000..5d4f6e315
--- /dev/null
+++ b/tpl/resources/resources.go
@@ -0,0 +1,255 @@
+// Copyright 2018 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 resources
+
+import (
+	"errors"
+	"fmt"
+	"path/filepath"
+
+	"github.com/gohugoio/hugo/deps"
+	"github.com/gohugoio/hugo/resource"
+	"github.com/gohugoio/hugo/resource/bundler"
+	"github.com/gohugoio/hugo/resource/create"
+	"github.com/gohugoio/hugo/resource/integrity"
+	"github.com/gohugoio/hugo/resource/minifiers"
+	"github.com/gohugoio/hugo/resource/postcss"
+	"github.com/gohugoio/hugo/resource/templates"
+	"github.com/gohugoio/hugo/resource/tocss/scss"
+	"github.com/spf13/cast"
+)
+
+// New returns a new instance of the resources-namespaced template functions.
+func New(deps *deps.Deps) (*Namespace, error) {
+	scssClient, err := scss.New(deps.BaseFs.Assets, deps.ResourceSpec)
+	if err != nil {
+		return nil, err
+	}
+	return &Namespace{
+		deps:            deps,
+		scssClient:      scssClient,
+		createClient:    create.New(deps.ResourceSpec),
+		bundlerClient:   bundler.New(deps.ResourceSpec),
+		integrityClient: integrity.New(deps.ResourceSpec),
+		minifyClient:    minifiers.New(deps.ResourceSpec),
+		postcssClient:   postcss.New(deps.ResourceSpec),
+		templatesClient: templates.New(deps.ResourceSpec, deps.TextTmpl),
+	}, nil
+}
+
+// Namespace provides template functions for the "resources" namespace.
+type Namespace struct {
+	deps *deps.Deps
+
+	createClient    *create.Client
+	bundlerClient   *bundler.Client
+	scssClient      *scss.Client
+	integrityClient *integrity.Client
+	minifyClient    *minifiers.Client
+	postcssClient   *postcss.Client
+	templatesClient *templates.Client
+}
+
+// Get locates the filename given in Hugo's filesystems: static, assets and content (in that order)
+// and creates a Resource object that can be used for further transformations.
+func (ns *Namespace) Get(filename interface{}) (resource.Resource, error) {
+	filenamestr, err := cast.ToStringE(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	filenamestr = filepath.Clean(filenamestr)
+
+	// Resource Get'ing is currently limited to /assets to make it simpler
+	// to control the behaviour of publishing and partial rebuilding.
+	return ns.createClient.Get(ns.deps.BaseFs.Assets.Fs, filenamestr)
+
+}
+
+// Concat concatenates a slice of Resource objects. These resources must
+// (currently) be of the same Media Type.
+func (ns *Namespace) Concat(targetPathIn interface{}, r []interface{}) (resource.Resource, error) {
+	targetPath, err := cast.ToStringE(targetPathIn)
+	if err != nil {
+		return nil, err
+	}
+	rr := make([]resource.Resource, len(r))
+	for i := 0; i < len(r); i++ {
+		rv, ok := r[i].(resource.Resource)
+		if !ok {
+			return nil, fmt.Errorf("cannot concat type %T", rv)
+		}
+		rr[i] = rv
+	}
+	return ns.bundlerClient.Concat(targetPath, rr)
+}
+
+// FromString creates a Resource from a string published to the relative target path.
+func (ns *Namespace) FromString(targetPathIn, contentIn interface{}) (resource.Resource, error) {
+	targetPath, err := cast.ToStringE(targetPathIn)
+	if err != nil {
+		return nil, err
+	}
+	content, err := cast.ToStringE(contentIn)
+	if err != nil {
+		return nil, err
+	}
+
+	return ns.createClient.FromString(targetPath, content)
+}
+
+// ExecuteAsTemplate creates a Resource from a Go template, parsed and executed with
+// the given data, and published to the relative target path.
+func (ns *Namespace) ExecuteAsTemplate(args ...interface{}) (resource.Resource, error) {
+	if len(args) != 3 {
+		return nil, fmt.Errorf("must provide targetPath, the template data context and a Resource object")
+	}
+	targetPath, err := cast.ToStringE(args[0])
+	if err != nil {
+		return nil, err
+	}
+	data := args[1]
+
+	r, ok := args[2].(resource.Resource)
+	if !ok {
+		return nil, fmt.Errorf("type %T not supported in Resource transformations", args[2])
+	}
+
+	return ns.templatesClient.ExecuteAsTemplate(r, targetPath, data)
+}
+
+// Fingerprint transforms the given Resource with a MD5 hash of the content in
+// the RelPermalink and Permalink.
+func (ns *Namespace) Fingerprint(args ...interface{}) (resource.Resource, error) {
+	if len(args) < 1 || len(args) > 2 {
+		return nil, errors.New("must provide a Resource and (optional) crypto algo")
+	}
+
+	var algo string
+	resIdx := 0
+
+	if len(args) == 2 {
+		resIdx = 1
+		var err error
+		algo, err = cast.ToStringE(args[0])
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	r, ok := args[resIdx].(resource.Resource)
+	if !ok {
+		return nil, fmt.Errorf("%T is not a Resource", args[resIdx])
+	}
+
+	return ns.integrityClient.Fingerprint(r, algo)
+}
+
+// Minify minifies the given Resource using the MediaType to pick the correct
+// minifier.
+func (ns *Namespace) Minify(r resource.Resource) (resource.Resource, error) {
+	return ns.minifyClient.Minify(r)
+}
+
+// ToCSS converts the given Resource to CSS. You can optional provide an Options
+// object or a target path (string) as first argument.
+func (ns *Namespace) ToCSS(args ...interface{}) (resource.Resource, error) {
+	var (
+		r          resource.Resource
+		m          map[string]interface{}
+		targetPath string
+		err        error
+		ok         bool
+	)
+
+	r, targetPath, ok = ns.resolveIfFirstArgIsString(args)
+
+	if !ok {
+		r, m, err = ns.resolveArgs(args)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	var options scss.Options
+	if targetPath != "" {
+		options.TargetPath = targetPath
+	} else if m != nil {
+		options, err = scss.DecodeOptions(m)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return ns.scssClient.ToCSS(r, options)
+}
+
+// PostCSS processes the given Resource with PostCSS
+func (ns *Namespace) PostCSS(args ...interface{}) (resource.Resource, error) {
+	r, m, err := ns.resolveArgs(args)
+	if err != nil {
+		return nil, err
+	}
+	var options postcss.Options
+	if m != nil {
+		options, err = postcss.DecodeOptions(m)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return ns.postcssClient.Process(r, options)
+}
+
+// We allow string or a map as the first argument in some cases.
+func (ns *Namespace) resolveIfFirstArgIsString(args []interface{}) (resource.Resource, string, bool) {
+	if len(args) != 2 {
+		return nil, "", false
+	}
+
+	v1, ok1 := args[0].(string)
+	if !ok1 {
+		return nil, "", false
+	}
+	v2, ok2 := args[1].(resource.Resource)
+
+	return v2, v1, ok2
+}
+
+// This roundabout way of doing it is needed to get both pipeline behaviour and options as arguments.
+func (ns *Namespace) resolveArgs(args []interface{}) (resource.Resource, map[string]interface{}, error) {
+	if len(args) == 0 {
+		return nil, nil, errors.New("no Resource provided in transformation")
+	}
+
+	if len(args) == 1 {
+		r, ok := args[0].(resource.Resource)
+		if !ok {
+			return nil, nil, fmt.Errorf("type %T not supported in Resource transformations", args[0])
+		}
+		return r, nil, nil
+	}
+
+	r, ok := args[1].(resource.Resource)
+	if !ok {
+		return nil, nil, fmt.Errorf("type %T not supported in Resource transformations", args[0])
+	}
+
+	m, err := cast.ToStringMapE(args[0])
+	if err != nil {
+		return nil, nil, fmt.Errorf("invalid options type: %s", err)
+	}
+
+	return r, m, nil
+}
diff --git a/tpl/template.go b/tpl/template.go
index e04d2cc6c..2cef92bb2 100644
--- a/tpl/template.go
+++ b/tpl/template.go
@@ -38,13 +38,15 @@ type TemplateHandler interface {
 	LoadTemplates(prefix string)
 	PrintErrors()
 
+	NewTextTemplate() TemplateParseFinder
+
 	MarkReady()
 	RebuildClone()
 }
 
 // TemplateFinder finds templates.
 type TemplateFinder interface {
-	Lookup(name string) *TemplateAdapter
+	Lookup(name string) (Template, bool)
 }
 
 // Template is the common interface between text/template and html/template.
@@ -53,6 +55,17 @@ type Template interface {
 	Name() string
 }
 
+// TemplateParser is used to parse ad-hoc templates, e.g. in the Resource chain.
+type TemplateParser interface {
+	Parse(name, tpl string) (Template, error)
+}
+
+// TemplateParseFinder provides both parsing and finding.
+type TemplateParseFinder interface {
+	TemplateParser
+	TemplateFinder
+}
+
 // TemplateExecutor adds some extras to Template.
 type TemplateExecutor interface {
 	Template
diff --git a/tpl/tplimpl/template.go b/tpl/tplimpl/template.go
index e838ebc57..f19c312ec 100644
--- a/tpl/tplimpl/template.go
+++ b/tpl/tplimpl/template.go
@@ -55,7 +55,7 @@ var (
 	_ templateFuncsterTemplater = (*textTemplates)(nil)
 )
 
-// Protecting global map access (Amber)
+// Protecting  global map access (Amber)
 var amberMu sync.Mutex
 
 type templateErr struct {
@@ -70,18 +70,26 @@ type templateLoader interface {
 }
 
 type templateFuncsterTemplater interface {
+	templateFuncsterSetter
 	tpl.TemplateFinder
 	setFuncs(funcMap map[string]interface{})
+}
+
+type templateFuncsterSetter interface {
 	setTemplateFuncster(f *templateFuncster)
 }
 
 // templateHandler holds the templates in play.
 // It implements the templateLoader and tpl.TemplateHandler interfaces.
 type templateHandler struct {
+	mu sync.Mutex
+
 	// text holds all the pure text templates.
 	text *textTemplates
 	html *htmlTemplates
 
+	extTextTemplates []*textTemplate
+
 	amberFuncMap template.FuncMap
 
 	errors []*templateErr
@@ -93,6 +101,19 @@ type templateHandler struct {
 	*deps.Deps
 }
 
+// NewTextTemplate provides a text template parser that has all the Hugo
+// template funcs etc. built-in.
+func (t *templateHandler) NewTextTemplate() tpl.TemplateParseFinder {
+	t.mu.Lock()
+	t.mu.Unlock()
+
+	tt := &textTemplate{t: texttemplate.New("")}
+	t.extTextTemplates = append(t.extTextTemplates, tt)
+
+	return tt
+
+}
+
 func (t *templateHandler) addError(name string, err error) {
 	t.errors = append(t.errors, &templateErr{name, err})
 }
@@ -111,7 +132,7 @@ func (t *templateHandler) PrintErrors() {
 
 // Lookup tries to find a template with the given name in both template
 // collections: First HTML, then the plain text template collection.
-func (t *templateHandler) Lookup(name string) *tpl.TemplateAdapter {
+func (t *templateHandler) Lookup(name string) (tpl.Template, bool) {
 
 	if strings.HasPrefix(name, textTmplNamePrefix) {
 		// The caller has explicitly asked for a text template, so only look
@@ -123,8 +144,8 @@ func (t *templateHandler) Lookup(name string) *tpl.TemplateAdapter {
 	}
 
 	// Look in both
-	if te := t.html.Lookup(name); te != nil {
-		return te
+	if te, found := t.html.Lookup(name); found {
+		return te, true
 	}
 
 	return t.text.Lookup(name)
@@ -136,7 +157,7 @@ func (t *templateHandler) clone(d *deps.Deps) *templateHandler {
 		Deps:      d,
 		layoutsFs: d.BaseFs.Layouts.Fs,
 		html:      &htmlTemplates{t: template.Must(t.html.t.Clone()), overlays: make(map[string]*template.Template)},
-		text:      &textTemplates{t: texttemplate.Must(t.text.t.Clone()), overlays: make(map[string]*texttemplate.Template)},
+		text:      &textTemplates{textTemplate: &textTemplate{t: texttemplate.Must(t.text.t.Clone())}, overlays: make(map[string]*texttemplate.Template)},
 		errors:    make([]*templateErr, 0),
 	}
 
@@ -171,8 +192,8 @@ func newTemplateAdapter(deps *deps.Deps) *templateHandler {
 		overlays: make(map[string]*template.Template),
 	}
 	textT := &textTemplates{
-		t:        texttemplate.New(""),
-		overlays: make(map[string]*texttemplate.Template),
+		textTemplate: &textTemplate{t: texttemplate.New("")},
+		overlays:     make(map[string]*texttemplate.Template),
 	}
 	return &templateHandler{
 		Deps:      deps,
@@ -205,12 +226,12 @@ func (t *htmlTemplates) setTemplateFuncster(f *templateFuncster) {
 	t.funcster = f
 }
 
-func (t *htmlTemplates) Lookup(name string) *tpl.TemplateAdapter {
+func (t *htmlTemplates) Lookup(name string) (tpl.Template, bool) {
 	templ := t.lookup(name)
 	if templ == nil {
-		return nil
+		return nil, false
 	}
-	return &tpl.TemplateAdapter{Template: templ, Metrics: t.funcster.Deps.Metrics}
+	return &tpl.TemplateAdapter{Template: templ, Metrics: t.funcster.Deps.Metrics}, true
 }
 
 func (t *htmlTemplates) lookup(name string) *template.Template {
@@ -233,27 +254,25 @@ func (t *htmlTemplates) lookup(name string) *template.Template {
 	return nil
 }
 
-type textTemplates struct {
-	funcster *templateFuncster
-
-	t *texttemplate.Template
+func (t *textTemplates) setTemplateFuncster(f *templateFuncster) {
+	t.funcster = f
+}
 
+type textTemplates struct {
+	*textTemplate
+	funcster   *templateFuncster
 	clone      *texttemplate.Template
 	cloneClone *texttemplate.Template
 
 	overlays map[string]*texttemplate.Template
 }
 
-func (t *textTemplates) setTemplateFuncster(f *templateFuncster) {
-	t.funcster = f
-}
-
-func (t *textTemplates) Lookup(name string) *tpl.TemplateAdapter {
+func (t *textTemplates) Lookup(name string) (tpl.Template, bool) {
 	templ := t.lookup(name)
 	if templ == nil {
-		return nil
+		return nil, false
 	}
-	return &tpl.TemplateAdapter{Template: templ, Metrics: t.funcster.Deps.Metrics}
+	return &tpl.TemplateAdapter{Template: templ, Metrics: t.funcster.Deps.Metrics}, true
 }
 
 func (t *textTemplates) lookup(name string) *texttemplate.Template {
@@ -336,9 +355,34 @@ func (t *htmlTemplates) addLateTemplate(name, tpl string) error {
 	return t.addTemplateIn(t.clone, name, tpl)
 }
 
+type textTemplate struct {
+	t *texttemplate.Template
+}
+
+func (t *textTemplate) Parse(name, tpl string) (tpl.Template, error) {
+	return t.parSeIn(t.t, name, tpl)
+}
+
+func (t *textTemplate) Lookup(name string) (tpl.Template, bool) {
+	tpl := t.t.Lookup(name)
+	return tpl, tpl != nil
+}
+
+func (t *textTemplate) parSeIn(tt *texttemplate.Template, name, tpl string) (*texttemplate.Template, error) {
+	templ, err := tt.New(name).Parse(tpl)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := applyTemplateTransformersToTextTemplate(templ); err != nil {
+		return nil, err
+	}
+	return templ, nil
+}
+
 func (t *textTemplates) addTemplateIn(tt *texttemplate.Template, name, tpl string) error {
 	name = strings.TrimPrefix(name, textTmplNamePrefix)
-	templ, err := tt.New(name).Parse(tpl)
+	templ, err := t.parSeIn(tt, name, tpl)
 	if err != nil {
 		return err
 	}
@@ -467,17 +511,22 @@ func (t *templateHandler) initFuncs() {
 
 	// Both template types will get their own funcster instance, which
 	// in the current case contains the same set of funcs.
-	for _, funcsterHolder := range []templateFuncsterTemplater{t.html, t.text} {
+	funcMap := createFuncMap(t.Deps)
+	for _, funcsterHolder := range []templateFuncsterSetter{t.html, t.text} {
 		funcster := newTemplateFuncster(t.Deps)
 
 		// The URL funcs in the funcMap is somewhat language dependent,
 		// so we need to wait until the language and site config is loaded.
-		funcster.initFuncMap()
+		funcster.initFuncMap(funcMap)
 
 		funcsterHolder.setTemplateFuncster(funcster)
 
 	}
 
+	for _, extText := range t.extTextTemplates {
+		extText.t.Funcs(funcMap)
+	}
+
 	// Amber is HTML only.
 	t.amberFuncMap = template.FuncMap{}
 
diff --git a/tpl/tplimpl/templateFuncster.go b/tpl/tplimpl/templateFuncster.go
index e6bbde8ec..9490123ab 100644
--- a/tpl/tplimpl/templateFuncster.go
+++ b/tpl/tplimpl/templateFuncster.go
@@ -51,12 +51,12 @@ func (t *templateFuncster) partial(name string, contextList ...interface{}) (int
 	}
 
 	for _, n := range []string{"partials/" + name, "theme/partials/" + name} {
-		templ := t.Tmpl.Lookup(n)
-		if templ == nil {
+		templ, found := t.Tmpl.Lookup(n)
+		if !found {
 			// For legacy reasons.
-			templ = t.Tmpl.Lookup(n + ".html")
+			templ, found = t.Tmpl.Lookup(n + ".html")
 		}
-		if templ != nil {
+		if found {
 			b := bp.GetBuffer()
 			defer bp.PutBuffer(b)
 
@@ -64,7 +64,7 @@ func (t *templateFuncster) partial(name string, contextList ...interface{}) (int
 				return "", err
 			}
 
-			if _, ok := templ.Template.(*texttemplate.Template); ok {
+			if _, ok := templ.(*texttemplate.Template); ok {
 				return b.String(), nil
 			}
 
diff --git a/tpl/tplimpl/templateProvider.go b/tpl/tplimpl/templateProvider.go
index af89fed11..df44e81a6 100644
--- a/tpl/tplimpl/templateProvider.go
+++ b/tpl/tplimpl/templateProvider.go
@@ -30,6 +30,8 @@ func (*TemplateProvider) Update(deps *deps.Deps) error {
 	newTmpl := newTemplateAdapter(deps)
 	deps.Tmpl = newTmpl
 
+	deps.TextTmpl = newTmpl.NewTextTemplate()
+
 	newTmpl.initFuncs()
 	newTmpl.loadEmbedded()
 
diff --git a/tpl/tplimpl/template_funcs.go b/tpl/tplimpl/template_funcs.go
index 6ce387aca..f1ed7f36f 100644
--- a/tpl/tplimpl/template_funcs.go
+++ b/tpl/tplimpl/template_funcs.go
@@ -18,6 +18,8 @@ package tplimpl
 import (
 	"html/template"
 
+	"github.com/gohugoio/hugo/deps"
+
 	"github.com/gohugoio/hugo/tpl/internal"
 
 	// Init the namespaces
@@ -35,6 +37,7 @@ import (
 	_ "github.com/gohugoio/hugo/tpl/os"
 	_ "github.com/gohugoio/hugo/tpl/partials"
 	_ "github.com/gohugoio/hugo/tpl/path"
+	_ "github.com/gohugoio/hugo/tpl/resources"
 	_ "github.com/gohugoio/hugo/tpl/safe"
 	_ "github.com/gohugoio/hugo/tpl/strings"
 	_ "github.com/gohugoio/hugo/tpl/time"
@@ -42,12 +45,12 @@ import (
 	_ "github.com/gohugoio/hugo/tpl/urls"
 )
 
-func (t *templateFuncster) initFuncMap() {
+func createFuncMap(d *deps.Deps) map[string]interface{} {
 	funcMap := template.FuncMap{}
 
 	// Merge the namespace funcs
 	for _, nsf := range internal.TemplateFuncsNamespaceRegistry {
-		ns := nsf(t.Deps)
+		ns := nsf(d)
 		if _, exists := funcMap[ns.Name]; exists {
 			panic(ns.Name + " is a duplicate template func")
 		}
@@ -61,8 +64,13 @@ func (t *templateFuncster) initFuncMap() {
 			}
 
 		}
+
 	}
 
+	return funcMap
+
+}
+func (t *templateFuncster) initFuncMap(funcMap template.FuncMap) {
 	t.funcMap = funcMap
 	t.Tmpl.(*templateHandler).setFuncs(funcMap)
 }
diff --git a/tpl/tplimpl/template_funcs_test.go b/tpl/tplimpl/template_funcs_test.go
index a1745282d..341be805a 100644
--- a/tpl/tplimpl/template_funcs_test.go
+++ b/tpl/tplimpl/template_funcs_test.go
@@ -51,6 +51,9 @@ func newTestConfig() config.Provider {
 	v.Set("i18nDir", "i18n")
 	v.Set("layoutDir", "layouts")
 	v.Set("archetypeDir", "archetypes")
+	v.Set("assetDir", "assets")
+	v.Set("resourceDir", "resources")
+	v.Set("publishDir", "public")
 	return v
 }
 
@@ -76,12 +79,13 @@ func TestTemplateFuncsExamples(t *testing.T) {
 	v.Set("workingDir", workingDir)
 	v.Set("multilingual", true)
 	v.Set("contentDir", "content")
+	v.Set("assetDir", "assets")