ref: dd45e6d7e5406991d8df3a2f9ba4c7e5ae039c34
dir: /tpl/template.go/
// Copyright 2016 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 tpl
import (
"fmt"
"html/template"
"io"
"os"
"path/filepath"
"strings"
"github.com/eknkc/amber"
"github.com/spf13/afero"
bp "github.com/spf13/hugo/bufferpool"
"github.com/spf13/hugo/helpers"
"github.com/spf13/hugo/hugofs"
jww "github.com/spf13/jwalterweatherman"
"github.com/yosssi/ace"
)
var localTemplates *template.Template
var tmpl Template
// TODO(bep) an interface with hundreds of methods ... remove it.
// And unexport most of these methods.
type Template interface {
ExecuteTemplate(wr io.Writer, name string, data interface{}) error
Lookup(name string) *template.Template
Templates() []*template.Template
New(name string) *template.Template
GetClone() *template.Template
LoadTemplates(absPath string)
LoadTemplatesWithPrefix(absPath, prefix string)
MarkReady()
AddTemplate(name, tpl string) error
AddTemplateFileWithMaster(name, overlayFilename, masterFilename string) error
AddAceTemplate(name, basePath, innerPath string, baseContent, innerContent []byte) error
AddInternalTemplate(prefix, name, tpl string) error
AddInternalShortcode(name, tpl string) error
PrintErrors()
}
type templateErr struct {
name string
err error
}
type GoHTMLTemplate struct {
template.Template
clone *template.Template
// a separate storage for the overlays created from cloned master templates.
// note: No mutex protection, so we add these in one Go routine, then just read.
overlays map[string]*template.Template
errors []*templateErr
}
// The "Global" Template System
func T() Template {
if tmpl == nil {
tmpl = New()
}
return tmpl
}
// InitializeT resets the internal template state to its initial state
func InitializeT() Template {
tmpl = New()
return tmpl
}
// New returns a new Hugo Template System
// with all the additional features, templates & functions
func New() Template {
var templates = &GoHTMLTemplate{
Template: *template.New(""),
overlays: make(map[string]*template.Template),
errors: make([]*templateErr, 0),
}
localTemplates = &templates.Template
for k, v := range funcMap {
amber.FuncMap[k] = v
}
templates.Funcs(funcMap)
templates.LoadEmbedded()
return templates
}
func partial(name string, contextList ...interface{}) template.HTML {
if strings.HasPrefix("partials/", name) {
name = name[8:]
}
var context interface{}
if len(contextList) == 0 {
context = nil
} else {
context = contextList[0]
}
return ExecuteTemplateToHTML(context, "partials/"+name, "theme/partials/"+name)
}
func executeTemplate(context interface{}, w io.Writer, layouts ...string) {
worked := false
for _, layout := range layouts {
name := layout
if Lookup(name) == nil {
name = layout + ".html"
}
if templ := Lookup(name); templ != nil {
err := templ.Execute(w, context)
if err != nil {
jww.ERROR.Println(err, "in", name)
}
worked = true
break
}
}
if !worked {
jww.ERROR.Println("Unable to render", layouts)
jww.ERROR.Println("Expecting to find a template in either the theme/layouts or /layouts in one of the following relative locations", layouts)
}
}
func ExecuteTemplateToHTML(context interface{}, layouts ...string) template.HTML {
b := bp.GetBuffer()
defer bp.PutBuffer(b)
executeTemplate(context, b, layouts...)
return template.HTML(b.String())
}
func Lookup(name string) *template.Template {
return (tmpl.(*GoHTMLTemplate)).Lookup(name)
}
func (t *GoHTMLTemplate) Lookup(name string) *template.Template {
if templ := localTemplates.Lookup(name); templ != nil {
return templ
}
if t.overlays != nil {
if templ, ok := t.overlays[name]; ok {
return templ
}
}
if t.clone != nil {
if templ := t.clone.Lookup(name); templ != nil {
return templ
}
}
return nil
}
func (t *GoHTMLTemplate) GetClone() *template.Template {
return t.clone
}
func (t *GoHTMLTemplate) LoadEmbedded() {
t.EmbedShortcodes()
t.EmbedTemplates()
}
// MarkReady marks the template as "ready for execution". No changes allowed
// after this is set.
func (t *GoHTMLTemplate) MarkReady() {
if t.clone == nil {
t.clone = template.Must(t.Template.Clone())
}
}
func (t *GoHTMLTemplate) checkState() {
if t.clone != nil {
panic("template is cloned and cannot be modfified")
}
}
func (t *GoHTMLTemplate) AddInternalTemplate(prefix, name, tpl string) error {
if prefix != "" {
return t.AddTemplate("_internal/"+prefix+"/"+name, tpl)
}
return t.AddTemplate("_internal/"+name, tpl)
}
func (t *GoHTMLTemplate) AddInternalShortcode(name, content string) error {
return t.AddInternalTemplate("shortcodes", name, content)
}
func (t *GoHTMLTemplate) AddTemplate(name, tpl string) error {
t.checkState()
_, err := t.New(name).Parse(tpl)
if err != nil {
t.errors = append(t.errors, &templateErr{name: name, err: err})
}
return err
}
func (t *GoHTMLTemplate) AddTemplateFileWithMaster(name, overlayFilename, masterFilename string) error {
// There is currently no known way to associate a cloned template with an existing one.
// This funky master/overlay design will hopefully improve in a future version of Go.
//
// Simplicity is hard.
//
// Until then we'll have to live with this hackery.
//
// See https://github.com/golang/go/issues/14285
//
// So, to do minimum amount of changes to get this to work:
//
// 1. Lookup or Parse the master
// 2. Parse and store the overlay in a separate map
masterTpl := t.Lookup(masterFilename)
if masterTpl == nil {
b, err := afero.ReadFile(hugofs.Source(), masterFilename)
if err != nil {
return err
}
masterTpl, err = t.New(masterFilename).Parse(string(b))
if err != nil {
// TODO(bep) Add a method that does this
t.errors = append(t.errors, &templateErr{name: name, err: err})
return err
}
}
b, err := afero.ReadFile(hugofs.Source(), overlayFilename)
if err != nil {
return err
}
overlayTpl, err := template.Must(masterTpl.Clone()).Parse(string(b))
if err != nil {
t.errors = append(t.errors, &templateErr{name: name, err: err})
} else {
t.overlays[name] = overlayTpl
}
return err
}
func (t *GoHTMLTemplate) AddAceTemplate(name, basePath, innerPath string, baseContent, innerContent []byte) error {
t.checkState()
var base, inner *ace.File
name = name[:len(name)-len(filepath.Ext(innerPath))] + ".html"
// Fixes issue #1178
basePath = strings.Replace(basePath, "\\", "/", -1)
innerPath = strings.Replace(innerPath, "\\", "/", -1)
if basePath != "" {
base = ace.NewFile(basePath, baseContent)
inner = ace.NewFile(innerPath, innerContent)
} else {
base = ace.NewFile(innerPath, innerContent)
inner = ace.NewFile("", []byte{})
}
parsed, err := ace.ParseSource(ace.NewSource(base, inner, []*ace.File{}), nil)
if err != nil {
t.errors = append(t.errors, &templateErr{name: name, err: err})
return err
}
_, err = ace.CompileResultWithTemplate(t.New(name), parsed, nil)
if err != nil {
t.errors = append(t.errors, &templateErr{name: name, err: err})
}
return err
}
func (t *GoHTMLTemplate) AddTemplateFile(name, baseTemplatePath, path string) error {
t.checkState()
// get the suffix and switch on that
ext := filepath.Ext(path)
switch ext {
case ".amber":
templateName := strings.TrimSuffix(name, filepath.Ext(name)) + ".html"
compiler := amber.New()
// Parse the input file
if err := compiler.ParseFile(path); err != nil {
return err
}
if _, err := compiler.CompileWithTemplate(t.New(templateName)); err != nil {
return err
}
case ".ace":
var innerContent, baseContent []byte
innerContent, err := afero.ReadFile(hugofs.Source(), path)
if err != nil {
return err
}
if baseTemplatePath != "" {
baseContent, err = afero.ReadFile(hugofs.Source(), baseTemplatePath)
if err != nil {
return err
}
}
return t.AddAceTemplate(name, baseTemplatePath, path, baseContent, innerContent)
default:
if baseTemplatePath != "" {
return t.AddTemplateFileWithMaster(name, path, baseTemplatePath)
}
b, err := afero.ReadFile(hugofs.Source(), path)
if err != nil {
return err
}
jww.DEBUG.Printf("Add template file from path %s", path)
return t.AddTemplate(name, string(b))
}
return nil
}
func (t *GoHTMLTemplate) GenerateTemplateNameFrom(base, path string) string {
name, _ := filepath.Rel(base, path)
return filepath.ToSlash(name)
}
func isDotFile(path string) bool {
return filepath.Base(path)[0] == '.'
}
func isBackupFile(path string) bool {
return path[len(path)-1] == '~'
}
const baseFileBase = "baseof"
var aceTemplateInnerMarkers = [][]byte{[]byte("= content")}
var goTemplateInnerMarkers = [][]byte{[]byte("{{define"), []byte("{{ define")}
func isBaseTemplate(path string) bool {
return strings.Contains(path, baseFileBase)
}
func (t *GoHTMLTemplate) loadTemplates(absPath string, prefix string) {
jww.DEBUG.Printf("Load templates from path %q prefix %q", absPath, prefix)
walker := func(path string, fi os.FileInfo, err error) error {
if err != nil {
return nil
}
jww.DEBUG.Println("Template path", path)
if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
link, err := filepath.EvalSymlinks(absPath)
if err != nil {
jww.ERROR.Printf("Cannot read symbolic link '%s', error was: %s", absPath, err)
return nil
}
linkfi, err := hugofs.Source().Stat(link)
if err != nil {
jww.ERROR.Printf("Cannot stat '%s', error was: %s", link, err)
return nil
}
if !linkfi.Mode().IsRegular() {
jww.ERROR.Printf("Symbolic links for directories not supported, skipping '%s'", absPath)
}
return nil
}
if !fi.IsDir() {
if isDotFile(path) || isBackupFile(path) || isBaseTemplate(path) {
return nil
}
tplName := t.GenerateTemplateNameFrom(absPath, path)
if prefix != "" {
tplName = strings.Trim(prefix, "/") + "/" + tplName
}
var baseTemplatePath string
// Ace and Go templates may have both a base and inner template.
pathDir := filepath.Dir(path)
if filepath.Ext(path) != ".amber" && !strings.HasSuffix(pathDir, "partials") && !strings.HasSuffix(pathDir, "shortcodes") {
innerMarkers := goTemplateInnerMarkers
baseFileName := fmt.Sprintf("%s.html", baseFileBase)
if filepath.Ext(path) == ".ace" {
innerMarkers = aceTemplateInnerMarkers
baseFileName = fmt.Sprintf("%s.ace", baseFileBase)
}
// This may be a view that shouldn't have base template
// Have to look inside it to make sure
needsBase, err := helpers.FileContainsAny(path, innerMarkers, hugofs.Source())
if err != nil {
return err
}
if needsBase {
// Look for base template in the follwing order:
// 1. <current-path>/<template-name>-baseof.<suffix>, e.g. list-baseof.<suffix>.
// 2. <current-path>/baseof.<suffix>
// 3. _default/<template-name>-baseof.<suffix>, e.g. list-baseof.<suffix>.
// 4. _default/baseof.<suffix>
// 5. <themedir>/layouts/_default/<template-name>-baseof.<suffix>
// 6. <themedir>/layouts/_default/baseof.<suffix>
currBaseFilename := fmt.Sprintf("%s-%s", helpers.Filename(path), baseFileName)
templateDir := filepath.Dir(path)
themeDir := helpers.GetThemeDir()
pathsToCheck := []string{
filepath.Join(templateDir, currBaseFilename),
filepath.Join(templateDir, baseFileName),
filepath.Join(absPath, "_default", currBaseFilename),
filepath.Join(absPath, "_default", baseFileName),
filepath.Join(themeDir, "layouts", "_default", currBaseFilename),
filepath.Join(themeDir, "layouts", "_default", baseFileName),
}
for _, pathToCheck := range pathsToCheck {
if ok, err := helpers.Exists(pathToCheck, hugofs.Source()); err == nil && ok {
baseTemplatePath = pathToCheck
break
}
}
}
}
t.AddTemplateFile(tplName, baseTemplatePath, path)
}
return nil
}
if err := helpers.SymbolicWalk(hugofs.Source(), absPath, walker); err != nil {
jww.ERROR.Printf("Failed to load templates: %s", err)
}
}
func (t *GoHTMLTemplate) LoadTemplatesWithPrefix(absPath string, prefix string) {
t.loadTemplates(absPath, prefix)
}
func (t *GoHTMLTemplate) LoadTemplates(absPath string) {
t.loadTemplates(absPath, "")
}
func (t *GoHTMLTemplate) PrintErrors() {
for _, e := range t.errors {
jww.ERROR.Println(e.err)
}
}