ref: 2f10da15707e1db0fab90524a247bc8a2d3ded90
dir: /hugolib/page.go/
// Copyright © 2013 Steve Francia <[email protected]>.
//
// Licensed under the Simple Public 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://opensource.org/licenses/Simple-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 hugolib
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/BurntSushi/toml"
helper "github.com/spf13/hugo/template"
"github.com/spf13/hugo/template/bundle"
"github.com/theplant/blackfriday"
"html/template"
"io"
"launchpad.net/goyaml"
"path"
"sort"
"strings"
"time"
"unicode"
)
type Page struct {
Status string
Images []string
Content template.HTML
Summary template.HTML
RawMarkdown string // TODO should be []byte
Params map[string]interface{}
RenderedContent *bytes.Buffer
contentType string
Draft bool
Aliases []string
Tmpl bundle.Template
Markup string
PageMeta
File
Position
Node
}
type File struct {
FileName, OutFile, Extension string
}
type PageMeta struct {
WordCount int
FuzzyWordCount int
}
type Position struct {
Prev *Page
Next *Page
}
type Pages []*Page
func (p Pages) Len() int { return len(p) }
func (p Pages) Less(i, j int) bool { return p[i].Date.Unix() > p[j].Date.Unix() }
func (p Pages) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
// TODO eliminate unnecessary things
func (p Pages) Sort() { sort.Sort(p) }
func (p Pages) Limit(n int) Pages { return p[0:n] }
func getSummaryString(content []byte) ([]byte, bool) {
if bytes.Contains(content, summaryDivider) {
return bytes.Split(content, summaryDivider)[0], false
} else {
plainContent := StripHTML(StripShortcodes(string(content)))
return []byte(TruncateWordsToWholeSentence(plainContent, summaryLength)), true
}
}
// TODO abstract further to support loading from more
// than just files on disk. Should load reader (file, []byte)
func newPage(filename string) *Page {
page := Page{contentType: "",
File: File{FileName: filename, Extension: "html"},
Node: Node{Keywords: make([]string, 10, 30)},
Params: make(map[string]interface{}),
Markup: "md"}
page.Date, _ = time.Parse("20060102", "20080101")
page.guessSection()
return &page
}
func StripHTML(s string) string {
output := ""
// Shortcut strings with no tags in them
if !strings.ContainsAny(s, "<>") {
output = s
} else {
s = strings.Replace(s, "\n", " ", -1)
s = strings.Replace(s, "</p>", " \n", -1)
s = strings.Replace(s, "<br>", " \n", -1)
s = strings.Replace(s, "</br>", " \n", -1)
// Walk through the string removing all tags
b := new(bytes.Buffer)
inTag := false
for _, r := range s {
switch r {
case '<':
inTag = true
case '>':
inTag = false
default:
if !inTag {
b.WriteRune(r)
}
}
}
output = b.String()
}
return output
}
func (p *Page) guessSection() {
if p.Section == "" {
x := strings.Split(p.FileName, "/")
if len(x) > 1 {
if section := x[len(x)-2]; section != "content" {
p.Section = section
}
}
}
}
func (page *Page) Type() string {
if page.contentType != "" {
return page.contentType
}
page.guessSection()
if x := page.Section; x != "" {
return x
}
return "page"
}
func (page *Page) Layout(l ...string) string {
layout := ""
if len(l) == 0 {
layout = "single"
} else {
layout = l[0]
}
if x := page.layout; x != "" {
return x
}
return strings.ToLower(page.Type()) + "/" + layout + ".html"
}
func ReadFrom(buf io.Reader, name string) (page *Page, err error) {
if len(name) == 0 {
return nil, errors.New("Zero length page name")
}
p := newPage(name)
if err = p.parse(buf); err != nil {
return
}
p.analyzePage()
return p, nil
}
func (p *Page) analyzePage() {
p.WordCount = TotalWords(p.RawMarkdown)
p.FuzzyWordCount = int((p.WordCount+100)/100) * 100
}
func splitPageContent(data []byte, start string, end string) ([]string, []string) {
lines := strings.Split(string(data), "\n")
datum := lines[0:]
var found = 0
if start != end {
for i, line := range lines {
if strings.HasPrefix(line, start) {
found += 1
}
if strings.HasPrefix(line, end) {
found -= 1
}
if found == 0 {
datum = lines[0 : i+1]
lines = lines[i+1:]
break
}
}
}
return datum, lines
}
func (p *Page) Permalink() template.HTML {
baseUrl := string(p.Site.BaseUrl)
section := strings.TrimSpace(p.Section)
pSlug := strings.TrimSpace(p.Slug)
pUrl := strings.TrimSpace(p.Url)
var permalink string
if len(pSlug) > 0 {
if p.Site.Config.UglyUrls {
permalink = section + "/" + p.Slug + "." + p.Extension
} else {
permalink = section + "/" + p.Slug + "/"
}
} else if len(pUrl) > 2 {
permalink = pUrl
} else {
_, t := path.Split(p.FileName)
if p.Site.Config.UglyUrls {
x := replaceExtension(strings.TrimSpace(t), p.Extension)
permalink = section + "/" + x
} else {
file, _ := fileExt(strings.TrimSpace(t))
permalink = section + "/" + file
}
}
return template.HTML(MakePermalink(baseUrl, permalink))
}
func (page *Page) handleTomlMetaData(datum []byte) (interface{}, error) {
m := map[string]interface{}{}
if _, err := toml.Decode(string(datum), &m); err != nil {
return m, fmt.Errorf("Invalid TOML in %s \nError parsing page meta data: %s", page.FileName, err)
}
return m, nil
}
func (page *Page) handleYamlMetaData(datum []byte) (interface{}, error) {
m := map[string]interface{}{}
if err := goyaml.Unmarshal(datum, &m); err != nil {
return m, fmt.Errorf("Invalid YAML in %s \nError parsing page meta data: %s", page.FileName, err)
}
return m, nil
}
func (page *Page) handleJsonMetaData(datum []byte) (interface{}, error) {
var f interface{}
if err := json.Unmarshal(datum, &f); err != nil {
return f, fmt.Errorf("Invalid JSON in %v \nError parsing page meta data: %s", page.FileName, err)
}
return f, nil
}
func (page *Page) update(f interface{}) error {
m := f.(map[string]interface{})
for k, v := range m {
switch strings.ToLower(k) {
case "title":
page.Title = interfaceToString(v)
case "description":
page.Description = interfaceToString(v)
case "slug":
page.Slug = helper.Urlize(interfaceToString(v))
case "url":
if url := interfaceToString(v); strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://") {
return fmt.Errorf("Only relative urls are supported, %v provided", url)
}
page.Url = helper.Urlize(interfaceToString(v))
case "type":
page.contentType = interfaceToString(v)
case "keywords":
page.Keywords = interfaceArrayToStringArray(v)
case "date", "pubdate":
page.Date = interfaceToStringToDate(v)
case "draft":
page.Draft = interfaceToBool(v)
case "layout":
page.layout = interfaceToString(v)
case "markup":
page.Markup = interfaceToString(v)
case "aliases":
page.Aliases = interfaceArrayToStringArray(v)
for _, alias := range page.Aliases {
if strings.HasPrefix(alias, "http://") || strings.HasPrefix(alias, "https://") {
return fmt.Errorf("Only relative aliases are supported, %v provided", alias)
}
}
case "status":
page.Status = interfaceToString(v)
default:
// If not one of the explicit values, store in Params
switch vv := v.(type) {
case string: // handle string values
page.Params[strings.ToLower(k)] = vv
default: // handle array of strings as well
switch vvv := vv.(type) {
case []interface{}:
var a = make([]string, len(vvv))
for i, u := range vvv {
a[i] = interfaceToString(u)
}
page.Params[strings.ToLower(k)] = a
}
}
}
}
return nil
}
func (page *Page) GetParam(key string) interface{} {
v := page.Params[strings.ToLower(key)]
if v == nil {
return nil
}
switch v.(type) {
case string:
return interfaceToString(v)
case []string:
return v
}
return nil
}
var ErrDetectingFrontMatter = errors.New("unable to detect front matter")
var ErrMatchingStartingFrontMatterDelimiter = errors.New("unable to match beginning front matter delimiter")
var ErrMatchingEndingFrontMatterDelimiter = errors.New("unable to match ending front matter delimiter")
func (page *Page) parseFrontMatter(data *bufio.Reader) (err error) {
if err = checkEmpty(data); err != nil {
return fmt.Errorf("%s: %s", page.FileName, err)
}
var mark rune
if mark, err = chompWhitespace(data); err != nil {
return
}
f := page.detectFrontMatter(mark)
if f == nil {
return ErrDetectingFrontMatter
}
if found, err := beginFrontMatter(data, f); err != nil || !found {
return ErrMatchingStartingFrontMatterDelimiter
}
var frontmatter = new(bytes.Buffer)
for {
line, _, err := data.ReadLine()
if err != nil {
if err == io.EOF {
return ErrMatchingEndingFrontMatterDelimiter
}
return err
}
if bytes.Equal(line, f.markend) {
if f.includeMark {
frontmatter.Write(line)
}
break
}
frontmatter.Write(line)
frontmatter.Write([]byte{'\n'})
}
metadata, err := f.parse(frontmatter.Bytes())
if err != nil {
return
}
if err = page.update(metadata); err != nil {
return
}
return
}
func checkEmpty(data *bufio.Reader) (err error) {
if _, _, err = data.ReadRune(); err != nil {
return errors.New("unable to locate front matter")
}
if err = data.UnreadRune(); err != nil {
return errors.New("unable to unread first charactor in page buffer.")
}
return
}
type frontmatterType struct {
markstart, markend []byte
parse func([]byte) (interface{}, error)
includeMark bool
}
func (page *Page) detectFrontMatter(mark rune) (f *frontmatterType) {
switch mark {
case '-':
return &frontmatterType{[]byte{'-', '-', '-'}, []byte{'-', '-', '-'}, page.handleYamlMetaData, false}
case '+':
return &frontmatterType{[]byte{'+', '+', '+'}, []byte{'+', '+', '+'}, page.handleTomlMetaData, false}
case '{':
return &frontmatterType{[]byte{'{'}, []byte{'}'}, page.handleJsonMetaData, true}
default:
return nil
}
}
func beginFrontMatter(data *bufio.Reader, f *frontmatterType) (bool, error) {
var err error
var peek []byte
if f.includeMark {
peek, err = data.Peek(len(f.markstart))
} else {
peek = make([]byte, len(f.markstart))
_, err = data.Read(peek)
}
if err != nil {
return false, err
}
return bytes.Equal(peek, f.markstart), nil
}
func chompWhitespace(data *bufio.Reader) (r rune, err error) {
for {
r, _, err = data.ReadRune()
if err != nil {
return
}
if unicode.IsSpace(r) {
continue
}
if err := data.UnreadRune(); err != nil {
return r, errors.New("unable to unread first charactor in front matter.")
}
return r, nil
}
}
func (p *Page) Render(layout ...string) template.HTML {
curLayout := ""
if len(layout) > 0 {
curLayout = layout[0]
}
return template.HTML(string(p.ExecuteTemplate(curLayout).Bytes()))
}
func (p *Page) ExecuteTemplate(layout string) *bytes.Buffer {
l := p.Layout(layout)
buffer := new(bytes.Buffer)
p.Tmpl.ExecuteTemplate(buffer, l, p)
return buffer
}
func (page *Page) parse(reader io.Reader) error {
data := bufio.NewReader(reader)
err := page.parseFrontMatter(data)
if err != nil {
return err
}
switch page.Markup {
case "md":
page.convertMarkdown(data)
case "rst":
page.convertRestructuredText(data)
}
return nil
}
func (page *Page) convertMarkdown(lines io.Reader) {
b := new(bytes.Buffer)
b.ReadFrom(lines)
content := b.Bytes()
page.Content = template.HTML(string(blackfriday.MarkdownCommon(RemoveSummaryDivider(content))))
summary, plain := getSummaryString(content)
if plain {
page.Summary = template.HTML(string(summary))
} else {
page.Summary = template.HTML(string(blackfriday.MarkdownCommon(summary)))
}
}
func (page *Page) convertRestructuredText(lines io.Reader) {
b := new(bytes.Buffer)
b.ReadFrom(lines)
content := b.Bytes()
page.Content = template.HTML(getRstContent(content))
summary, plain := getSummaryString(content)
if plain {
page.Summary = template.HTML(string(summary))
} else {
page.Summary = template.HTML(getRstContent(summary))
}
}