mirror of https://github.com/gohugoio/hugo.git
129 lines
3.3 KiB
Go
129 lines
3.3 KiB
Go
// Copyright 2017 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package partials
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import (
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"fmt"
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"html/template"
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"strings"
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"sync"
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texttemplate "text/template"
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bp "github.com/gohugoio/hugo/bufferpool"
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"github.com/gohugoio/hugo/deps"
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)
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// TestTemplateProvider is global deps.ResourceProvider.
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// NOTE: It's currently unused.
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var TestTemplateProvider deps.ResourceProvider
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// partialCache represents a cache of partials protected by a mutex.
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type partialCache struct {
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sync.RWMutex
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p map[string]interface{}
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}
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// New returns a new instance of the templates-namespaced template functions.
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func New(deps *deps.Deps) *Namespace {
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return &Namespace{
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deps: deps,
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cachedPartials: partialCache{p: make(map[string]interface{})},
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}
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}
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// Namespace provides template functions for the "templates" namespace.
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type Namespace struct {
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deps *deps.Deps
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cachedPartials partialCache
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}
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// Include executes the named partial and returns either a string,
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// when the partial is a text/template, or template.HTML when html/template.
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func (ns *Namespace) Include(name string, contextList ...interface{}) (interface{}, error) {
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if strings.HasPrefix("partials/", name) {
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name = name[8:]
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}
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var context interface{}
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if len(contextList) == 0 {
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context = nil
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} else {
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context = contextList[0]
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}
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for _, n := range []string{"partials/" + name, "theme/partials/" + name} {
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templ := ns.deps.Tmpl.Lookup(n)
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if templ == nil {
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// For legacy reasons.
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templ = ns.deps.Tmpl.Lookup(n + ".html")
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}
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if templ != nil {
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b := bp.GetBuffer()
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defer bp.PutBuffer(b)
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if err := templ.Execute(b, context); err != nil {
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return "", err
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}
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if _, ok := templ.Template.(*texttemplate.Template); ok {
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return b.String(), nil
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}
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return template.HTML(b.String()), nil
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}
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}
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return "", fmt.Errorf("Partial %q not found", name)
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}
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// getCached executes and caches partial templates. An optional variant
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// string parameter (a string slice actually, but be only use a variadic
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// argument to make it optional) can be passed so that a given partial can have
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// multiple uses. The cache is created with name+variant as the key.
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func (ns *Namespace) getCached(name string, context interface{}, variant ...string) (interface{}, error) {
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key := name
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if len(variant) > 0 {
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for i := 0; i < len(variant); i++ {
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key += variant[i]
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}
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}
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return ns.getOrCreate(key, name, context)
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}
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func (ns *Namespace) getOrCreate(key, name string, context interface{}) (p interface{}, err error) {
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var ok bool
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ns.cachedPartials.RLock()
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p, ok = ns.cachedPartials.p[key]
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ns.cachedPartials.RUnlock()
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if ok {
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return
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}
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ns.cachedPartials.Lock()
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if p, ok = ns.cachedPartials.p[key]; !ok {
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ns.cachedPartials.Unlock()
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p, err = ns.Include(name, context)
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ns.cachedPartials.Lock()
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ns.cachedPartials.p[key] = p
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}
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ns.cachedPartials.Unlock()
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return
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}
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