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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 tpl
import (
"fmt"
"io"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/gohugoio/hugo/common/herrors"
"github.com/gohugoio/hugo/hugofs"
"github.com/spf13/afero"
"html/template"
texttemplate "text/template"
"text/template/parse"
bp "github.com/gohugoio/hugo/bufferpool"
"github.com/gohugoio/hugo/metrics"
"github.com/pkg/errors"
)
var (
_ TemplateExecutor = (*TemplateAdapter)(nil)
)
// TemplateHandler manages the collection of templates.
type TemplateHandler interface {
TemplateFinder
AddTemplate(name, tpl string) error
AddLateTemplate(name, tpl string) error
LoadTemplates(prefix string) error
NewTextTemplate() TemplateParseFinder
MarkReady()
RebuildClone()
}
// TemplateFinder finds templates.
type TemplateFinder interface {
Lookup(name string) (Template, bool)
}
// Template is the common interface between text/template and html/template.
type Template interface {
Execute(wr io.Writer, data interface{}) error
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
ExecuteToString(data interface{}) (string, error)
Tree() string
}
// TemplateDebugger prints some debug info to stdoud.
type TemplateDebugger interface {
Debug()
}
// TemplateAdapter implements the TemplateExecutor interface.
type TemplateAdapter struct {
Template
Metrics metrics.Provider
// The filesystem where the templates are stored.
Fs afero.Fs
// Maps to base template if relevant.
NameBaseTemplateName map[string]string
}
var baseOfRe = regexp.MustCompile("template: (.*?):")
func extractBaseOf(err string) string {
m := baseOfRe.FindStringSubmatch(err)
if len(m) == 2 {
return m[1]
}
return ""
}
// Execute executes the current template. The actual execution is performed
// by the embedded text or html template, but we add an implementation here so
// we can add a timer for some metrics.
func (t *TemplateAdapter) Execute(w io.Writer, data interface{}) (execErr error) {
defer func() {
// Panics in templates are a little bit too common (nil pointers etc.)
if r := recover(); r != nil {
execErr = t.addFileContext(t.Name(), fmt.Errorf("panic in Execute: %s", r))
}
}()
if t.Metrics != nil {
defer t.Metrics.MeasureSince(t.Name(), time.Now())
}
execErr = t.Template.Execute(w, data)
if execErr != nil {
execErr = t.addFileContext(t.Name(), execErr)
}
return
}
var identifiersRe = regexp.MustCompile("at \\<(.*?)\\>:")
func (t *TemplateAdapter) extractIdentifiers(line string) []string {
m := identifiersRe.FindAllStringSubmatch(line, -1)
identifiers := make([]string, len(m))
for i := 0; i < len(m); i++ {
identifiers[i] = m[i][1]
}
return identifiers
}
func (t *TemplateAdapter) addFileContext(name string, inerr error) error {
f, realFilename, err := t.fileAndFilename(t.Name())
if err != nil {
return err
}
defer f.Close()
master, hasMaster := t.NameBaseTemplateName[name]
ferr := errors.Wrapf(inerr, "execute of template %q failed", realFilename)
// Since this can be a composite of multiple template files (single.html + baseof.html etc.)
// we potentially need to look in both -- and cannot rely on line number alone.
lineMatcher := func(le herrors.FileError, lineNumber int, line string) bool {
if le.LineNumber() != lineNumber {
return false
}
if !hasMaster {
return true
}
identifiers := t.extractIdentifiers(le.Error())
for _, id := range identifiers {
if strings.Contains(line, id) {
return true
}
}
return false
}
// TODO(bep) 2errors text vs HTML
fe, ok := herrors.WithFileContext(ferr, f, "go-html-template", lineMatcher)
if ok || !hasMaster {
return fe
}
// Try the base template if relevant
f, realFilename, err = t.fileAndFilename(master)
if err != nil {
return err
}
defer f.Close()
ferr = errors.Wrapf(inerr, "execute of template %q failed", realFilename)
fe, _ = herrors.WithFileContext(ferr, f, "go-html-template", lineMatcher)
return fe
}
func (t *TemplateAdapter) fileAndFilename(name string) (afero.File, string, error) {
fs := t.Fs
filename := filepath.FromSlash(name)
fi, err := fs.Stat(filename)
if err != nil {
return nil, "", errors.Wrapf(err, "failed to Stat %q", filename)
}
f, err := fs.Open(filename)
if err != nil {
return nil, "", errors.Wrapf(err, "failed to open template file %q:", filename)
}
return f, fi.(hugofs.RealFilenameInfo).RealFilename(), nil
}
// ExecuteToString executes the current template and returns the result as a
// string.
func (t *TemplateAdapter) ExecuteToString(data interface{}) (string, error) {
b := bp.GetBuffer()
defer bp.PutBuffer(b)
if err := t.Execute(b, data); err != nil {
return "", err
}
return b.String(), nil
}
// Tree returns the template Parse tree as a string.
// Note: this isn't safe for parallel execution on the same template
// vs Lookup and Execute.
func (t *TemplateAdapter) Tree() string {
var tree *parse.Tree
switch tt := t.Template.(type) {
case *template.Template:
tree = tt.Tree
case *texttemplate.Template:
tree = tt.Tree
default:
panic("Unknown template")
}
if tree == nil || tree.Root == nil {
return ""
}
s := tree.Root.String()
return s
}
// TemplateFuncsGetter allows to get a map of functions.
type TemplateFuncsGetter interface {
GetFuncs() map[string]interface{}
}
// TemplateTestMocker adds a way to override some template funcs during tests.
// The interface is named so it's not used in reg
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