hugo/resources/page/pages.go
Bjørn Erik Pedersen 597e418cb0
Make Page an interface
The main motivation of this commit is to add a `page.Page` interface to replace the very file-oriented `hugolib.Page` struct.
This is all a preparation step for issue  #5074, "pages from other data sources".

But this also fixes a set of annoying limitations, especially related to custom output formats, and shortcodes.

Most notable changes:

* The inner content of shortcodes using the `{{%` as the outer-most delimiter will now be sent to the content renderer, e.g. Blackfriday.
  This means that any markdown will partake in the global ToC and footnote context etc.
* The Custom Output formats are now "fully virtualized". This removes many of the current limitations.
* The taxonomy list type now has a reference to the `Page` object.
  This improves the taxonomy template `.Title` situation and make common template constructs much simpler.

See #5074
Fixes #5763
Fixes #5758
Fixes #5090
Fixes #5204
Fixes #4695
Fixes #5607
Fixes #5707
Fixes #5719
Fixes #3113
Fixes #5706
Fixes #5767
Fixes #5723
Fixes #5769
Fixes #5770
Fixes #5771
Fixes #5759
Fixes #5776
Fixes #5777
Fixes #5778
2019-03-23 18:51:22 +01:00

115 lines
2.4 KiB
Go

// Copyright 2019 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 page
import (
"fmt"
"math/rand"
"github.com/gohugoio/hugo/resources/resource"
)
var (
_ resource.ResourcesConverter = Pages{}
)
// Pages is a slice of pages. This is the most common list type in Hugo.
type Pages []Page
func (ps Pages) String() string {
return fmt.Sprintf("Pages(%d)", len(ps))
}
// Used in tests.
func (ps Pages) shuffle() {
for i := range ps {
j := rand.Intn(i + 1)
ps[i], ps[j] = ps[j], ps[i]
}
}
// ToResources wraps resource.ResourcesConverter
func (pages Pages) ToResources() resource.Resources {
r := make(resource.Resources, len(pages))
for i, p := range pages {
r[i] = p
}
return r
}
// ToPages tries to convert seq into Pages.
func ToPages(seq interface{}) (Pages, error) {
if seq == nil {
return Pages{}, nil
}
switch v := seq.(type) {
case Pages:
return v, nil
case *Pages:
return *(v), nil
case WeightedPages:
return v.Pages(), nil
case PageGroup:
return v.Pages, nil
case []interface{}:
pages := make(Pages, len(v))
success := true
for i, vv := range v {
p, ok := vv.(Page)
if !ok {
success = false
break
}
pages[i] = p
}
if success {
return pages, nil
}
}
return nil, fmt.Errorf("cannot convert type %T to Pages", seq)
}
func (p Pages) Group(key interface{}, in interface{}) (interface{}, error) {
pages, err := ToPages(in)
if err != nil {
return nil, err
}
return PageGroup{Key: key, Pages: pages}, nil
}
// Len returns the number of pages in the list.
func (p Pages) Len() int {
return len(p)
}
func (ps Pages) removeFirstIfFound(p Page) Pages {
ii := -1
for i, pp := range ps {
if p.Eq(pp) {
ii = i
break
}
}
if ii != -1 {
ps = append(ps[:ii], ps[ii+1:]...)
}
return ps
}
// PagesFactory somehow creates some Pages.
// We do a lot of lazy Pages initialization in Hugo, so we need a type.
type PagesFactory func() Pages