tpl/images: Make it a package that stands on its own

See #3042

tpl/images/init.go

@@ -0,0 +1,43 @@
+// Copyright 2017 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 images
+
+import (
+	"github.com/spf13/hugo/deps"
+	"github.com/spf13/hugo/tpl/internal"
+)
+
+const name = "images"
+
+func init() {
+	f := func(d *deps.Deps) *internal.TemplateFuncsNamespace {
+		ctx := New(d)
+
+		examples := [][2]string{
+			{},
+		}
+
+		return &internal.TemplateFuncsNamespace{
+			Name:    name,
+			Context: func() interface{} { return ctx },
+			Aliases: map[string]interface{}{
+				"imageConfig": ctx.Config,
+			},
+			Examples: examples,
+		}
+
+	}
+
+	internal.AddTemplateFuncsNamespace(f)
+}

tpl/tplimpl/templateFuncster.go

@@ -21,7 +21,6 @@ import (
 
 	bp "github.com/spf13/hugo/bufferpool"
 	"github.com/spf13/hugo/deps"
-	"github.com/spf13/hugo/tpl/images"
 	"github.com/spf13/hugo/tpl/inflect"
 	"github.com/spf13/hugo/tpl/os"
 	"github.com/spf13/hugo/tpl/safe"
@@ -36,7 +35,6 @@ type templateFuncster struct {
 	cachedPartials partialCache
 
 	// Namespaces
-	images    *images.Namespace
 	inflect   *inflect.Namespace
 	os        *os.Namespace
 	safe      *safe.Namespace
@@ -53,7 +51,6 @@ func newTemplateFuncster(deps *deps.Deps) *templateFuncster {
 		cachedPartials: partialCache{p: make(map[string]interface{})},
 
 		// Namespaces
-		images:    images.New(deps),
 		inflect:   inflect.New(),
 		os:        os.New(deps),
 		safe:      safe.New(),

tpl/tplimpl/template_funcs.go

@@ -29,6 +29,7 @@ import (
 	_ "github.com/spf13/hugo/tpl/crypto"
 	_ "github.com/spf13/hugo/tpl/data"
 	_ "github.com/spf13/hugo/tpl/encoding"
+	_ "github.com/spf13/hugo/tpl/images"
 	_ "github.com/spf13/hugo/tpl/lang"
 	_ "github.com/spf13/hugo/tpl/math"
 	_ "github.com/spf13/hugo/tpl/strings"
@@ -85,7 +86,6 @@ func (t *templateFuncster) partialCached(name string, context interface{}, varia
 func (t *templateFuncster) initFuncMap() {
 	funcMap := template.FuncMap{
 		// Namespaces
-		"images":  t.images.Namespace,
 		"inflect": t.inflect.Namespace,
 		"os":      t.os.Namespace,
 		"safe":    t.safe.Namespace,
@@ -102,7 +102,6 @@ func (t *templateFuncster) initFuncMap() {
 		"htmlEscape":    t.transform.HTMLEscape,
 		"htmlUnescape":  t.transform.HTMLUnescape,
 		"humanize":      t.inflect.Humanize,
-		"imageConfig":   t.images.Config,
 		"int":           func(v interface{}) (int, error) { return cast.ToIntE(v) },
 		"markdownify":   t.transform.Markdownify,
 		"now":           t.time.Now,