hugo/resources/page/permalinks.go
Bjørn Erik Pedersen 9f5a92078a
Add Hugo Modules
This commit implements Hugo Modules.

This is a broad subject, but some keywords include:

* A new `module` configuration section where you can import almost anything. You can configure both your own file mounts nd the file mounts of the modules you import. This is the new recommended way of configuring what you earlier put in `configDir`, `staticDir` etc. And it also allows you to mount folders in non-Hugo-projects, e.g. the `SCSS` folder in the Bootstrap GitHub project.
* A module consists of a set of mounts to the standard 7 component types in Hugo: `static`, `content`, `layouts`, `data`, `assets`, `i18n`, and `archetypes`. Yes, Theme Components can now include content, which should be very useful, especially in bigger multilingual projects.
* Modules not in your local file cache will be downloaded automatically and even "hot replaced" while the server is running.
* Hugo Modules supports and encourages semver versioned modules, and uses the minimal version selection algorithm to resolve versions.
* A new set of CLI commands are provided to manage all of this: `hugo mod init`,  `hugo mod get`,  `hugo mod graph`,  `hugo mod tidy`, and  `hugo mod vendor`.

All of the above is backed by Go Modules.

Fixes #5973
Fixes #5996
Fixes #6010
Fixes #5911
Fixes #5940
Fixes #6074
Fixes #6082
Fixes #6092
2019-07-24 09:35:53 +02:00

253 lines
6.8 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"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"github.com/pkg/errors"
"github.com/gohugoio/hugo/helpers"
)
// PermalinkExpander holds permalin mappings per section.
type PermalinkExpander struct {
// knownPermalinkAttributes maps :tags in a permalink specification to a
// function which, given a page and the tag, returns the resulting string
// to be used to replace that tag.
knownPermalinkAttributes map[string]pageToPermaAttribute
expanders map[string]func(Page) (string, error)
ps *helpers.PathSpec
}
// NewPermalinkExpander creates a new PermalinkExpander configured by the given
// PathSpec.
func NewPermalinkExpander(ps *helpers.PathSpec) (PermalinkExpander, error) {
p := PermalinkExpander{ps: ps}
p.knownPermalinkAttributes = map[string]pageToPermaAttribute{
"year": p.pageToPermalinkDate,
"month": p.pageToPermalinkDate,
"monthname": p.pageToPermalinkDate,
"day": p.pageToPermalinkDate,
"weekday": p.pageToPermalinkDate,
"weekdayname": p.pageToPermalinkDate,
"yearday": p.pageToPermalinkDate,
"section": p.pageToPermalinkSection,
"sections": p.pageToPermalinkSections,
"title": p.pageToPermalinkTitle,
"slug": p.pageToPermalinkSlugElseTitle,
"filename": p.pageToPermalinkFilename,
}
patterns := ps.Cfg.GetStringMapString("permalinks")
if patterns == nil {
return p, nil
}
e, err := p.parse(patterns)
if err != nil {
return p, err
}
p.expanders = e
return p, nil
}
// Expand expands the path in p according to the rules defined for the given key.
// If no rules are found for the given key, an empty string is returned.
func (l PermalinkExpander) Expand(key string, p Page) (string, error) {
expand, found := l.expanders[key]
if !found {
return "", nil
}
return expand(p)
}
func (l PermalinkExpander) parse(patterns map[string]string) (map[string]func(Page) (string, error), error) {
expanders := make(map[string]func(Page) (string, error))
// Allow " " and / to represent the root section.
const sectionCutSet = " /" + string(os.PathSeparator)
for k, pattern := range patterns {
k = strings.Trim(k, sectionCutSet)
if !l.validate(pattern) {
return nil, &permalinkExpandError{pattern: pattern, err: errPermalinkIllFormed}
}
pattern := pattern
matches := attributeRegexp.FindAllStringSubmatch(pattern, -1)
callbacks := make([]pageToPermaAttribute, len(matches))
replacements := make([]string, len(matches))
for i, m := range matches {
replacement := m[0]
attr := replacement[1:]
replacements[i] = replacement
callback, ok := l.knownPermalinkAttributes[attr]
if !ok {
return nil, &permalinkExpandError{pattern: pattern, err: errPermalinkAttributeUnknown}
}
callbacks[i] = callback
}
expanders[k] = func(p Page) (string, error) {
if matches == nil {
return pattern, nil
}
newField := pattern
for i, replacement := range replacements {
attr := replacement[1:]
callback := callbacks[i]
newAttr, err := callback(p, attr)
if err != nil {
return "", &permalinkExpandError{pattern: pattern, err: err}
}
newField = strings.Replace(newField, replacement, newAttr, 1)
}
return newField, nil
}
}
return expanders, nil
}
// pageToPermaAttribute is the type of a function which, given a page and a tag
// can return a string to go in that position in the page (or an error)
type pageToPermaAttribute func(Page, string) (string, error)
var attributeRegexp = regexp.MustCompile(`:\w+`)
// validate determines if a PathPattern is well-formed
func (l PermalinkExpander) validate(pp string) bool {
fragments := strings.Split(pp[1:], "/")
var bail = false
for i := range fragments {
if bail {
return false
}
if len(fragments[i]) == 0 {
bail = true
continue
}
matches := attributeRegexp.FindAllStringSubmatch(fragments[i], -1)
if matches == nil {
continue
}
for _, match := range matches {
k := strings.ToLower(match[0][1:])
if _, ok := l.knownPermalinkAttributes[k]; !ok {
return false
}
}
}
return true
}
type permalinkExpandError struct {
pattern string
err error
}
func (pee *permalinkExpandError) Error() string {
return fmt.Sprintf("error expanding %q: %s", string(pee.pattern), pee.err)
}
var (
errPermalinkIllFormed = errors.New("permalink ill-formed")
errPermalinkAttributeUnknown = errors.New("permalink attribute not recognised")
)
func (l PermalinkExpander) pageToPermalinkDate(p Page, dateField string) (string, error) {
// a Page contains a Node which provides a field Date, time.Time
switch dateField {
case "year":
return strconv.Itoa(p.Date().Year()), nil
case "month":
return fmt.Sprintf("%02d", int(p.Date().Month())), nil
case "monthname":
return p.Date().Month().String(), nil
case "day":
return fmt.Sprintf("%02d", p.Date().Day()), nil
case "weekday":
return strconv.Itoa(int(p.Date().Weekday())), nil
case "weekdayname":
return p.Date().Weekday().String(), nil
case "yearday":
return strconv.Itoa(p.Date().YearDay()), nil
}
//TODO: support classic strftime escapes too
// (and pass those through despite not being in the map)
panic("coding error: should not be here")
}
// pageToPermalinkTitle returns the URL-safe form of the title
func (l PermalinkExpander) pageToPermalinkTitle(p Page, _ string) (string, error) {
return l.ps.URLize(p.Title()), nil
}
// pageToPermalinkFilename returns the URL-safe form of the filename
func (l PermalinkExpander) pageToPermalinkFilename(p Page, _ string) (string, error) {
name := p.File().TranslationBaseName()
if name == "index" {
// Page bundles; the directory name will hopefully have a better name.
dir := strings.TrimSuffix(p.File().Dir(), helpers.FilePathSeparator)
_, name = filepath.Split(dir)
}
return l.ps.URLize(name), nil
}
// if the page has a slug, return the slug, else return the title
func (l PermalinkExpander) pageToPermalinkSlugElseTitle(p Page, a string) (string, error) {
if p.Slug() != "" {
return l.ps.URLize(p.Slug()), nil
}
return l.pageToPermalinkTitle(p, a)
}
func (l PermalinkExpander) pageToPermalinkSection(p Page, _ string) (string, error) {
return p.Section(), nil
}
func (l PermalinkExpander) pageToPermalinkSections(p Page, _ string) (string, error) {
return p.CurrentSection().SectionsPath(), nil
}