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// 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(
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