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tpl: Allow the partial template func to return any type 

This commit adds support for return values in partials.

This means that you can now do this and similar:

    {{ $v := add . 42 }}
    {{ return $v }}

Partials without a `return` statement will be rendered as before.

This works for both `partial` and `partialCached`.

Fixes #5783
This commit is contained in:
Bjørn Erik Pedersen 2019-04-02 10:30:24 +02:00 committed by GitHub
parent 9225db636e
commit a55640de8e
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 371 additions and 79 deletions
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6
compare/compare.go
View File

@ -20,6 +20,12 @@ type Eqer interface {
Eq(other interface{}) bool
}
// ProbablyEq is an equal check that may return false positives, but never
// a false negative.
type ProbablyEqer interface {
ProbablyEq(other interface{}) bool
}
// Comparer can be used to compare two values.
// This will be used when using the le, ge etc. operators in the templates.
// Compare returns -1 if the given version is less than, 0 if equal and 1 if greater than

41
hugolib/template_test.go
View File

@ -264,3 +264,44 @@ Hugo: {{ hugo.Generator }}
)
}
func TestPartialWithReturn(t *testing.T) {
b := newTestSitesBuilder(t).WithSimpleConfigFile()
b.WithTemplatesAdded(
"index.html", `
Test Partials With Return Values:
add42: 50: {{ partial "add42.tpl" 8 }}
dollarContext: 60: {{ partial "dollarContext.tpl" 18 }}
adder: 70: {{ partial "dict.tpl" (dict "adder" 28) }}
complex: 80: {{ partial "complex.tpl" 38 }}
`,
"partials/add42.tpl", `
{{ $v := add . 42 }}
{{ return $v }}
`,
"partials/dollarContext.tpl", `
{{ $v := add $ 42 }}
{{ return $v }}
`,
"partials/dict.tpl", `
{{ $v := add $.adder 42 }}
{{ return $v }}
`,
"partials/complex.tpl", `
{{ return add . 42 }}
`,
)
b.CreateSites().Build(BuildCfg{})
b.AssertFileContent("public/index.html",
"add42: 50: 50",
"dollarContext: 60: 60",
"adder: 70: 70",
"complex: 80: 80",
)
}

52
metrics/metrics.go
View File

@ -23,6 +23,12 @@ import (
"strings"
"sync"
"time"
"github.com/gohugoio/hugo/compare"
"github.com/gohugoio/hugo/common/hreflect"
"github.com/spf13/cast"
)
// The Provider interface defines an interface for measuring metrics.
@ -35,20 +41,20 @@ type Provider interface {
WriteMetrics(w io.Writer)
// TrackValue tracks the value for diff calculations etc.
TrackValue(key, value string)
TrackValue(key string, value interface{})
// Reset clears the metric store.
Reset()
}
type diff struct {
baseline string
baseline interface{}
count int
simSum int
}
func (d *diff) add(v string) *diff {
if d.baseline == "" {
func (d *diff) add(v interface{}) *diff {
if !hreflect.IsTruthful(v) {
d.baseline = v
d.count = 1
d.simSum = 100 // If we get only one it is very cache friendly.
@ -90,7 +96,7 @@ func (s *Store) Reset() {
}
// TrackValue tracks the value for diff calculations etc.
func (s *Store) TrackValue(key, value string) {
func (s *Store) TrackValue(key string, value interface{}) {
if !s.calculateHints {
return
}
@ -191,13 +197,43 @@ func (b bySum) Less(i, j int) bool { return b[i].sum > b[j].sum }
// howSimilar is a naive diff implementation that returns
// a number between 0-100 indicating how similar a and b are.
// 100 is when all words in a also exists in b.
func howSimilar(a, b string) int {
func howSimilar(a, b interface{}) int {
if a == b {
return 100
}
as, err1 := cast.ToStringE(a)
bs, err2 := cast.ToStringE(b)
if err1 == nil && err2 == nil {
return howSimilarStrings(as, bs)
}
if err1 != err2 {
return 0
}
e1, ok1 := a.(compare.Eqer)
e2, ok2 := b.(compare.Eqer)
if ok1 && ok2 && e1.Eq(e2) {
return 100
}
// TODO(bep) implement ProbablyEq for Pages etc.
pe1, pok1 := a.(compare.ProbablyEqer)
pe2, pok2 := b.(compare.ProbablyEqer)
if pok1 && pok2 && pe1.ProbablyEq(pe2) {
return 90
}
return 0
}
// howSimilar is a naive diff implementation that returns
// a number between 0-100 indicating how similar a and b are.
// 100 is when all words in a also exists in b.
func howSimilarStrings(a, b string) int {
// Give some weight to the word positions.
const partitionSize = 4

7
tpl/partials/init.go
View File

@ -36,6 +36,13 @@ func init() {
},
)
// TODO(bep) we need the return to be a valid identifier, but
// should consider another way of adding it.
ns.AddMethodMapping(func() string { return "" },
[]string{"return"},
[][2]string{},
)
ns.AddMethodMapping(ctx.IncludeCached,
[]string{"partialCached"},
[][2]string{},

89
tpl/partials/partials.go
View File

@ -18,10 +18,14 @@ package partials
import (
"fmt"
"html/template"
"io"
"io/ioutil"
"strings"
"sync"
texttemplate "text/template"
"github.com/gohugoio/hugo/tpl"
bp "github.com/gohugoio/hugo/bufferpool"
"github.com/gohugoio/hugo/deps"
)
@ -62,8 +66,22 @@ type Namespace struct {
cachedPartials *partialCache
}
// Include executes the named partial and returns either a string,
// when the partial is a text/template, or template.HTML when html/template.
// contextWrapper makes room for a return value in a partial invocation.
type contextWrapper struct {
Arg interface{}
Result interface{}
}
// Set sets the return value and returns an empty string.
func (c *contextWrapper) Set(in interface{}) string {
c.Result = in
return ""
}
// Include executes the named partial.
// If the partial contains a return statement, that value will be returned.
// Else, the rendered output will be returned:
// A string if the partial is a text/template, or template.HTML when html/template.
func (ns *Namespace) Include(name string, contextList ...interface{}) (interface{}, error) {
if strings.HasPrefix(name, "partials/") {
name = name[8:]
@ -83,31 +101,54 @@ func (ns *Namespace) Include(name string, contextList ...interface{}) (interface
// For legacy reasons.
templ, found = ns.deps.Tmpl.Lookup(n + ".html")
}
if found {
b := bp.GetBuffer()
defer bp.PutBuffer(b)
if err := templ.Execute(b, context); err != nil {
return "", err
}
if _, ok := templ.(*texttemplate.Template); ok {
s := b.String()
if ns.deps.Metrics != nil {
ns.deps.Metrics.TrackValue(n, s)
}
return s, nil
}
s := b.String()
if ns.deps.Metrics != nil {
ns.deps.Metrics.TrackValue(n, s)
}
return template.HTML(s), nil
if !found {
return "", fmt.Errorf("partial %q not found", name)
}
return "", fmt.Errorf("partial %q not found", name)
var info tpl.Info
if ip, ok := templ.(tpl.TemplateInfoProvider); ok {
info = ip.TemplateInfo()
}
var w io.Writer
if info.HasReturn {
// Wrap the context sent to the template to capture the return value.
// Note that the template is rewritten to make sure that the dot (".")
// and the $ variable points to Arg.
context = &contextWrapper{
Arg: context,
}
// We don't care about any template output.
w = ioutil.Discard
} else {
b := bp.GetBuffer()
defer bp.PutBuffer(b)
w = b
}
if err := templ.Execute(w, context); err != nil {
return "", err
}
var result interface{}
if ctx, ok := context.(*contextWrapper); ok {
result = ctx.Result
} else if _, ok := templ.(*texttemplate.Template); ok {
result = w.(fmt.Stringer).String()
} else {
result = template.HTML(w.(fmt.Stringer).String())
}
if ns.deps.Metrics != nil {
ns.deps.Metrics.TrackValue(n, result)
}
return result, nil
}
// IncludeCached executes and caches partial templates. An optional variant

7
tpl/template_info.go
View File

@ -22,10 +22,17 @@ type Info struct {
// Set for shortcode templates with any {{ .Inner }}
IsInner bool
// Set for partials with a return statement.
HasReturn bool
// Config extracted from template.
Config Config
}
func (info Info) IsZero() bool {
return info.Config.Version == 0
}
type Config struct {
Version int
}

8
tpl/tplimpl/ace.go
View File

@ -51,15 +51,17 @@ func (t *templateHandler) addAceTemplate(name, basePath, innerPath string, baseC
return err
}
isShort := isShortcode(name)
typ := resolveTemplateType(name)
info, err := applyTemplateTransformersToHMLTTemplate(isShort, templ)
info, err := applyTemplateTransformersToHMLTTemplate(typ, templ)
if err != nil {
return err
}
if isShort {
if typ == templateShortcode {
t.addShortcodeVariant(name, info, templ)
} else {
t.templateInfo[name] = info
}
return nil

12
tpl/tplimpl/shortcodes.go
View File

@ -139,6 +139,18 @@ func templateNameAndVariants(name string) (string, []string) {
return name, variants
}
func resolveTemplateType(name string) templateType {
if isShortcode(name) {
return templateShortcode
}
if strings.Contains(name, "partials/") {
return templatePartial
}
return templateUndefined
}
func isShortcode(name string) bool {
return strings.Contains(name, "shortcodes/")
}

79
tpl/tplimpl/template.go
View File

@ -90,6 +90,11 @@ type templateHandler struct {
// (language, output format etc.) of that shortcode.
shortcodes map[string]*shortcodeTemplates
// templateInfo maps template name to some additional information about that template.
// Note that for shortcodes that same information is embedded in the
// shortcodeTemplates type.
templateInfo map[string]tpl.Info
// text holds all the pure text templates.
text *textTemplates
html *htmlTemplates
@ -172,18 +177,30 @@ func (t *templateHandler) Lookup(name string) (tpl.Template, bool) {
// The templates are stored without the prefix identificator.
name = strings.TrimPrefix(name, textTmplNamePrefix)
return t.text.Lookup(name)
return t.applyTemplateInfo(t.text.Lookup(name))
}
// Look in both
if te, found := t.html.Lookup(name); found {
return te, true
return t.applyTemplateInfo(te, true)
}
return t.text.Lookup(name)
return t.applyTemplateInfo(t.text.Lookup(name))
}
func (t *templateHandler) applyTemplateInfo(templ tpl.Template, found bool) (tpl.Template, bool) {
if adapter, ok := templ.(*tpl.TemplateAdapter); ok {
if adapter.Info.IsZero() {
if info, found := t.templateInfo[templ.Name()]; found {
adapter.Info = info
}
}
}
return templ, found
}
// This currently only applies to shortcodes and what we get here is the
// shortcode name.
func (t *templateHandler) LookupVariant(name string, variants tpl.TemplateVariants) (tpl.Template, bool, bool) {
@ -243,12 +260,13 @@ func (t *templateHandler) setFuncMapInTemplate(in interface{}, funcs map[string]
func (t *templateHandler) clone(d *deps.Deps) *templateHandler {
c := &templateHandler{
Deps: d,
layoutsFs: d.BaseFs.Layouts.Fs,
shortcodes: make(map[string]*shortcodeTemplates),
html: &htmlTemplates{t: template.Must(t.html.t.Clone()), overlays: make(map[string]*template.Template), templatesCommon: t.html.templatesCommon},
text: &textTemplates{textTemplate: &textTemplate{t: texttemplate.Must(t.text.t.Clone())}, overlays: make(map[string]*texttemplate.Template), templatesCommon: t.text.templatesCommon},
errors: make([]*templateErr, 0),
Deps: d,
layoutsFs: d.BaseFs.Layouts.Fs,
shortcodes: make(map[string]*shortcodeTemplates),
templateInfo: t.templateInfo,
html: &htmlTemplates{t: template.Must(t.html.t.Clone()), overlays: make(map[string]*template.Template), templatesCommon: t.html.templatesCommon},
text: &textTemplates{textTemplate: &textTemplate{t: texttemplate.Must(t.text.t.Clone())}, overlays: make(map[string]*texttemplate.Template), templatesCommon: t.text.templatesCommon},
errors: make([]*templateErr, 0),
}
for k, v := range t.shortcodes {
@ -306,12 +324,13 @@ func newTemplateAdapter(deps *deps.Deps) *templateHandler {
templatesCommon: common,
}
h := &templateHandler{
Deps: deps,
layoutsFs: deps.BaseFs.Layouts.Fs,
shortcodes: make(map[string]*shortcodeTemplates),
html: htmlT,
text: textT,
errors: make([]*templateErr, 0),
Deps: deps,
layoutsFs: deps.BaseFs.Layouts.Fs,
shortcodes: make(map[string]*shortcodeTemplates),
templateInfo: make(map[string]tpl.Info),
html: htmlT,
text: textT,
errors: make([]*templateErr, 0),
}
common.handler = h
@ -463,15 +482,17 @@ func (t *htmlTemplates) addTemplateIn(tt *template.Template, name, tpl string) e
return err
}
isShort := isShortcode(name)
typ := resolveTemplateType(name)
info, err := applyTemplateTransformersToHMLTTemplate(isShort, templ)
info, err := applyTemplateTransformersToHMLTTemplate(typ, templ)
if err != nil {
return err
}
if isShort {
if typ == templateShortcode {
t.handler.addShortcodeVariant(name, info, templ)
} else {
t.handler.templateInfo[name] = info
}
return nil
@ -511,7 +532,7 @@ func (t *textTemplate) parseIn(tt *texttemplate.Template, name, tpl string) (*te
return nil, err
}
if _, err := applyTemplateTransformersToTextTemplate(false, templ); err != nil {
if _, err := applyTemplateTransformersToTextTemplate(templateUndefined, templ); err != nil {
return nil, err
}
return templ, nil
@ -524,15 +545,17 @@ func (t *textTemplates) addTemplateIn(tt *texttemplate.Template, name, tpl strin
return err
}
isShort := isShortcode(name)
typ := resolveTemplateType(name)
info, err := applyTemplateTransformersToTextTemplate(isShort, templ)
info, err := applyTemplateTransformersToTextTemplate(typ, templ)
if err != nil {
return err
}
if isShort {
if typ == templateShortcode {
t.handler.addShortcodeVariant(name, info, templ)
} else {
t.handler.templateInfo[name] = info
}
return nil
@ -737,7 +760,7 @@ func (t *htmlTemplates) handleMaster(name, overlayFilename, masterFilename strin
// * https://github.com/golang/go/issues/16101
// * https://github.com/gohugoio/hugo/issues/2549
overlayTpl = overlayTpl.Lookup(overlayTpl.Name())
if _, err := applyTemplateTransformersToHMLTTemplate(false, overlayTpl); err != nil {
if _, err := applyTemplateTransformersToHMLTTemplate(templateUndefined, overlayTpl); err != nil {
return err
}
@ -777,7 +800,7 @@ func (t *textTemplates) handleMaster(name, overlayFilename, masterFilename strin
}
overlayTpl = overlayTpl.Lookup(overlayTpl.Name())
if _, err := applyTemplateTransformersToTextTemplate(false, overlayTpl); err != nil {
if _, err := applyTemplateTransformersToTextTemplate(templateUndefined, overlayTpl); err != nil {
return err
}
t.overlays[name] = overlayTpl
@ -847,15 +870,17 @@ func (t *templateHandler) addTemplateFile(name, baseTemplatePath, path string) e
return err
}
isShort := isShortcode(name)
typ := resolveTemplateType(name)
info, err := applyTemplateTransformersToHMLTTemplate(isShort, templ)
info, err := applyTemplateTransformersToHMLTTemplate(typ, templ)
if err != nil {
return err
}
if isShort {
if typ == templateShortcode {
t.addShortcodeVariant(templateName, info, templ)
} else {
t.templateInfo[name] = info
}
return nil

102
tpl/tplimpl/template_ast_transformers.go
View File

@ -39,6 +39,14 @@ var reservedContainers = map[string]bool{
"Data": true,
}
type templateType int
const (
templateUndefined templateType = iota
templateShortcode
templatePartial
)
type templateContext struct {
decl decl
visited map[string]bool
@ -47,14 +55,16 @@ type templateContext struct {
// The last error encountered.
err error
// Only needed for shortcodes
isShortcode bool
typ templateType
// Set when we're done checking for config header.
configChecked bool
// Contains some info about the template
tpl.Info
// Store away the return node in partials.
returnNode *parse.CommandNode
}
func (c templateContext) getIfNotVisited(name string) *parse.Tree {
@ -84,12 +94,12 @@ func createParseTreeLookup(templ *template.Template) func(nn string) *parse.Tree
}
}
func applyTemplateTransformersToHMLTTemplate(isShortcode bool, templ *template.Template) (tpl.Info, error) {
return applyTemplateTransformers(isShortcode, templ.Tree, createParseTreeLookup(templ))
func applyTemplateTransformersToHMLTTemplate(typ templateType, templ *template.Template) (tpl.Info, error) {
return applyTemplateTransformers(typ, templ.Tree, createParseTreeLookup(templ))
}
func applyTemplateTransformersToTextTemplate(isShortcode bool, templ *texttemplate.Template) (tpl.Info, error) {
return applyTemplateTransformers(isShortcode, templ.Tree,
func applyTemplateTransformersToTextTemplate(typ templateType, templ *texttemplate.Template) (tpl.Info, error) {
return applyTemplateTransformers(typ, templ.Tree,
func(nn string) *parse.Tree {
tt := templ.Lookup(nn)
if tt != nil {
@ -99,19 +109,54 @@ func applyTemplateTransformersToTextTemplate(isShortcode bool, templ *texttempla
})
}
func applyTemplateTransformers(isShortcode bool, templ *parse.Tree, lookupFn func(name string) *parse.Tree) (tpl.Info, error) {
func applyTemplateTransformers(typ templateType, templ *parse.Tree, lookupFn func(name string) *parse.Tree) (tpl.Info, error) {
if templ == nil {
return tpl.Info{}, errors.New("expected template, but none provided")
}
c := newTemplateContext(lookupFn)
c.isShortcode = isShortcode
c.typ = typ
err := c.applyTransformations(templ.Root)
_, err := c.applyTransformations(templ.Root)
if err == nil && c.returnNode != nil {
// This is a partial with a return statement.
c.Info.HasReturn = true
templ.Root = c.wrapInPartialReturnWrapper(templ.Root)
}
return c.Info, err
}
const (
partialReturnWrapperTempl = `{{ $_hugo_dot := $ }}{{ $ := .Arg }}{{ with .Arg }}{{ $_hugo_dot.Set ("PLACEHOLDER") }}{{ end }}`
)
var partialReturnWrapper *parse.ListNode
func init() {
templ, err := texttemplate.New("").Parse(partialReturnWrapperTempl)
if err != nil {
panic(err)
}
partialReturnWrapper = templ.Tree.Root
}
func (c *templateContext) wrapInPartialReturnWrapper(n *parse.ListNode) *parse.ListNode {
wrapper := partialReturnWrapper.CopyList()
withNode := wrapper.Nodes[2].(*parse.WithNode)
retn := withNode.List.Nodes[0]
setCmd := retn.(*parse.ActionNode).Pipe.Cmds[0]
setPipe := setCmd.Args[1].(*parse.PipeNode)
// Replace PLACEHOLDER with the real return value.
// Note that this is a PipeNode, so it will be wrapped in parens.
setPipe.Cmds = []*parse.CommandNode{c.returnNode}
withNode.List.Nodes = append(n.Nodes, retn)
return wrapper
}
// The truth logic in Go's template package is broken for certain values
// for the if and with keywords. This works around that problem by wrapping
// the node passed to if/with in a getif conditional.
@ -141,7 +186,7 @@ func (c *templateContext) wrapWithGetIf(p *parse.PipeNode) {
// 1) Make all .Params.CamelCase and similar into lowercase.
// 2) Wraps every with and if pipe in getif
// 3) Collects some information about the template content.
func (c *templateContext) applyTransformations(n parse.Node) error {
func (c *templateContext) applyTransformations(n parse.Node) (bool, error) {
switch x := n.(type) {
case *parse.ListNode:
if x != nil {
@ -169,12 +214,16 @@ func (c *templateContext) applyTransformations(n parse.Node) error {
c.decl[x.Decl[0].Ident[0]] = x.Cmds[0].String()
}
for _, cmd := range x.Cmds {
c.applyTransformations(cmd)
for i, cmd := range x.Cmds {
keep, _ := c.applyTransformations(cmd)
if !keep {
x.Cmds = append(x.Cmds[:i], x.Cmds[i+1:]...)
}
}
case *parse.CommandNode:
c.collectInner(x)
keep := c.collectReturnNode(x)
for _, elem := range x.Args {
switch an := elem.(type) {
@ -191,9 +240,10 @@ func (c *templateContext) applyTransformations(n parse.Node) error {
}
}
}
return keep, c.err
}
return c.err
return true, c.err
}
func (c *templateContext) applyTransformationsToNodes(nodes ...parse.Node) {
@ -229,7 +279,7 @@ func (c *templateContext) hasIdent(idents []string, ident string) bool {
// on the form:
// {{ $_hugo_config:= `{ "version": 1 }` }}
func (c *templateContext) collectConfig(n *parse.PipeNode) {
if !c.isShortcode {
if c.typ != templateShortcode {
return
}
if c.configChecked {
@ -271,7 +321,7 @@ func (c *templateContext) collectConfig(n *parse.PipeNode) {
// collectInner determines if the given CommandNode represents a
// shortcode call to its .Inner.
func (c *templateContext) collectInner(n *parse.CommandNode) {
if !c.isShortcode {
if c.typ != templateShortcode {
return
}
if c.Info.IsInner || len(n.Args) == 0 {
@ -295,6 +345,28 @@ func (c *templateContext) collectInner(n *parse.CommandNode) {
}
func (c *templateContext) collectReturnNode(n *parse.CommandNode) bool {
if c.typ != templatePartial || c.returnNode != nil {
return true
}
if len(n.Args) < 2 {
return true
}
ident, ok := n.Args[0].(*parse.IdentifierNode)
if !ok || ident.Ident != "return" {
return true
}
c.returnNode = n
// Remove the "return" identifiers
c.returnNode.Args = c.returnNode.Args[1:]
return false
}
// indexOfReplacementStart will return the index of where to start doing replacement,
// -1 if none needed.
func (d decl) indexOfReplacementStart(idents []string) int {

47
tpl/tplimpl/template_ast_transformers_test.go
View File

@ -180,7 +180,7 @@ PARAMS SITE GLOBAL3: {{ $site.Params.LOWER }}
func TestParamsKeysToLower(t *testing.T) {
t.Parallel()
_, err := applyTemplateTransformers(false, nil, nil)
_, err := applyTemplateTransformers(templateUndefined, nil, nil)
require.Error(t, err)
templ, err := template.New("foo").Funcs(testFuncs).Parse(paramsTempl)
@ -484,7 +484,7 @@ func TestCollectInfo(t *testing.T) {
require.NoError(t, err)
c := newTemplateContext(createParseTreeLookup(templ))
c.isShortcode = true
c.typ = templateShortcode
c.applyTransformations(templ.Tree.Root)
assert.Equal(test.expected, c.Info)
@ -492,3 +492,46 @@ func TestCollectInfo(t *testing.T) {
}
}
func TestPartialReturn(t *testing.T) {
tests := []struct {
name string
tplString string
expected bool
}{
{"Basic", `
{{ $a := "Hugo Rocks!" }}
{{ return $a }}
`, true},
{"Expression", `
{{ return add 32 }}
`, true},
}
echo := func(in interface{}) interface{} {
return in
}
funcs := template.FuncMap{
"return": echo,
"add": echo,
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
assert := require.New(t)
templ, err := template.New("foo").Funcs(funcs).Parse(test.tplString)
require.NoError(t, err)
_, err = applyTemplateTransformers(templatePartial, templ.Tree, createParseTreeLookup(templ))
// Just check that it doesn't fail in this test. We have functional tests
// in hugoblib.
assert.NoError(err)
})
}
}