hugo/hugolib/page.go

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// Copyright © 2013 Steve Francia <spf@spf13.com>.
//
// 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 (
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"bytes"
"errors"
"fmt"
"html/template"
"io"
"net/url"
"path"
"strings"
"time"
"github.com/spf13/cast"
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"github.com/spf13/hugo/helpers"
"github.com/spf13/hugo/parser"
jww "github.com/spf13/jwalterweatherman"
"github.com/spf13/viper"
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"github.com/theplant/blackfriday"
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)
type Page struct {
Status string
Images []string
rawContent []byte
Content template.HTML
Summary template.HTML
TableOfContents template.HTML
Truncated bool
plain string // TODO should be []byte
Params map[string]interface{}
contentType string
Draft bool
Aliases []string
Tmpl Template
Markup string
renderable bool
layout string
linkTitle string
frontmatter []byte
sourceFrontmatter []byte
sourceContent []byte
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PageMeta
File
Position
Node
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}
type File struct {
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FileName, Extension, Dir string
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}
type PageMeta struct {
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WordCount int
FuzzyWordCount int
ReadingTime int
Weight int
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}
type Position struct {
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Prev *Page
Next *Page
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}
type Pages []*Page
func (p *Page) Plain() string {
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if len(p.plain) == 0 {
p.plain = helpers.StripHTML(StripShortcodes(string(p.renderBytes(p.rawContent))))
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}
return p.plain
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}
func (p *Page) setSummary() {
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if bytes.Contains(p.rawContent, summaryDivider) {
// If user defines split:
// Split then render
p.Truncated = true // by definition
header := bytes.Split(p.rawContent, summaryDivider)[0]
p.Summary = bytesToHTML(p.renderBytes(header))
} else {
// If hugo defines split:
// render, strip html, then split
plain := strings.TrimSpace(p.Plain())
p.Summary = bytesToHTML([]byte(TruncateWordsToWholeSentence(plain, summaryLength)))
p.Truncated = len(p.Summary) != len(plain)
}
}
func stripEmptyNav(in []byte) []byte {
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return bytes.Replace(in, []byte("<nav>\n</nav>\n\n"), []byte(``), -1)
}
func bytesToHTML(b []byte) template.HTML {
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return template.HTML(string(b))
}
func (p *Page) renderBytes(content []byte) []byte {
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return renderBytes(content, p.guessMarkupType())
}
func (p *Page) renderContent(content []byte) []byte {
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return renderBytesWithTOC(content, p.guessMarkupType())
}
func renderBytesWithTOC(content []byte, pagefmt string) []byte {
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switch pagefmt {
default:
return markdownRenderWithTOC(content)
case "markdown":
return markdownRenderWithTOC(content)
case "rst":
return []byte(getRstContent(content))
}
}
func renderBytes(content []byte, pagefmt string) []byte {
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switch pagefmt {
default:
return markdownRender(content)
case "markdown":
return markdownRender(content)
case "rst":
return []byte(getRstContent(content))
}
}
func newPage(filename string) *Page {
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page := Page{contentType: "",
File: File{FileName: filename, Extension: "html"},
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Node: Node{Keywords: []string{}, Sitemap: Sitemap{Priority: -1}},
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Params: make(map[string]interface{})}
jww.DEBUG.Println("Reading from", page.File.FileName)
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page.Date, _ = time.Parse("20060102", "20080101")
page.guessSection()
return &page
}
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func (p *Page) IsRenderable() bool {
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return p.renderable
}
func (p *Page) guessSection() {
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if p.Section == "" {
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p.Section = helpers.GuessSection(p.FileName)
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}
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}
func (page *Page) Type() string {
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if page.contentType != "" {
return page.contentType
}
page.guessSection()
if x := page.Section; x != "" {
return x
}
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return "page"
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}
func (page *Page) Layout(l ...string) []string {
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if page.layout != "" {
return layouts(page.Type(), page.layout)
}
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layout := ""
if len(l) == 0 {
layout = "single"
} else {
layout = l[0]
}
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return layouts(page.Type(), layout)
}
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func layouts(types string, layout string) (layouts []string) {
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t := strings.Split(types, "/")
for i := range t {
search := t[:len(t)-i]
layouts = append(layouts, fmt.Sprintf("%s/%s.html", strings.ToLower(path.Join(search...)), layout))
}
layouts = append(layouts, fmt.Sprintf("%s.html", layout))
return
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}
func NewPageFrom(buf io.Reader, name string) (page *Page, err error) {
p, err := NewPage(name)
if err != nil {
return p, err
}
err = p.ReadFrom(buf)
return p, err
}
func NewPage(name string) (page *Page, err error) {
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if len(name) == 0 {
return nil, errors.New("Zero length page name")
}
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// Create new page
p := newPage(name)
return p, nil
}
func (p *Page) ReadFrom(buf io.Reader) (err error) {
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// Parse for metadata & body
if err = p.parse(buf); err != nil {
jww.ERROR.Print(err)
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return
}
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//analyze for raw stats
p.analyzePage()
return nil
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}
func (p *Page) analyzePage() {
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p.WordCount = TotalWords(p.Plain())
p.FuzzyWordCount = int((p.WordCount+100)/100) * 100
p.ReadingTime = int((p.WordCount + 212) / 213)
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}
func (p *Page) permalink() (*url.URL, error) {
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baseUrl := string(p.Site.BaseUrl)
dir := strings.TrimSpace(p.Dir)
pSlug := strings.TrimSpace(p.Slug)
pUrl := strings.TrimSpace(p.Url)
var permalink string
var err error
if len(pUrl) > 0 {
return helpers.MakePermalink(baseUrl, pUrl), nil
}
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if override, ok := p.Site.Permalinks[p.Section]; ok {
permalink, err = override.Expand(p)
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if err != nil {
return nil, err
}
// fmt.Printf("have a section override for %q in section %s → %s\n", p.Title, p.Section, permalink)
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} else {
if len(pSlug) > 0 {
permalink = helpers.UrlPrep(viper.GetBool("UglyUrls"), path.Join(dir, p.Slug+"."+p.Extension))
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} else {
_, t := path.Split(p.FileName)
permalink = helpers.UrlPrep(viper.GetBool("UglyUrls"), path.Join(dir, helpers.ReplaceExtension(strings.TrimSpace(t), p.Extension)))
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}
}
return helpers.MakePermalink(baseUrl, permalink), nil
}
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func (p *Page) LinkTitle() string {
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if len(p.linkTitle) > 0 {
return p.linkTitle
} else {
return p.Title
}
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}
func (p *Page) Permalink() (string, error) {
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link, err := p.permalink()
if err != nil {
return "", err
}
return link.String(), nil
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}
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func (p *Page) RelPermalink() (string, error) {
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link, err := p.permalink()
if err != nil {
return "", err
}
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link.Scheme = ""
link.Host = ""
link.User = nil
link.Opaque = ""
return link.String(), nil
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}
func (page *Page) update(f interface{}) error {
if f == nil {
return fmt.Errorf("no metadata found")
}
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m := f.(map[string]interface{})
for k, v := range m {
loki := strings.ToLower(k)
switch loki {
case "title":
page.Title = cast.ToString(v)
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case "linktitle":
page.linkTitle = cast.ToString(v)
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case "description":
page.Description = cast.ToString(v)
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case "slug":
page.Slug = helpers.Urlize(cast.ToString(v))
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case "url":
if url := cast.ToString(v); strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://") {
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return fmt.Errorf("Only relative urls are supported, %v provided", url)
}
page.Url = helpers.Urlize(cast.ToString(v))
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case "type":
page.contentType = cast.ToString(v)
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case "keywords":
page.Keywords = cast.ToStringSlice(v)
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case "date", "pubdate":
page.Date = cast.ToTime(v)
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case "draft":
page.Draft = cast.ToBool(v)
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case "layout":
page.layout = cast.ToString(v)
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case "markup":
page.Markup = cast.ToString(v)
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case "weight":
page.Weight = cast.ToInt(v)
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case "aliases":
page.Aliases = cast.ToStringSlice(v)
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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 = cast.ToString(v)
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case "sitemap":
page.Sitemap = parseSitemap(cast.ToStringMap(v))
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default:
// If not one of the explicit values, store in Params
switch vv := v.(type) {
case bool:
page.Params[loki] = vv
case string:
page.Params[loki] = vv
case int64, int32, int16, int8, int:
page.Params[loki] = vv
case float64, float32:
page.Params[loki] = vv
case time.Time:
page.Params[loki] = 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] = cast.ToString(u)
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}
page.Params[loki] = a
default:
page.Params[loki] = vv
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}
}
}
}
return nil
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}
func (page *Page) GetParam(key string) interface{} {
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v := page.Params[strings.ToLower(key)]
if v == nil {
return nil
}
switch v.(type) {
case bool:
return cast.ToBool(v)
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case string:
return cast.ToString(v)
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case int64, int32, int16, int8, int:
return cast.ToInt(v)
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case float64, float32:
return cast.ToFloat64(v)
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case time.Time:
return cast.ToTime(v)
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case []string:
return v
}
return nil
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}
func (page *Page) HasMenuCurrent(menu string, me *MenuEntry) bool {
menus := page.Menus()
if m, ok := menus[menu]; ok {
if me.HasChildren() {
for _, child := range me.Children {
if child.Name == m.Name {
return true
}
}
}
}
return false
}
func (page *Page) IsMenuCurrent(menu string, name string) bool {
menus := page.Menus()
if me, ok := menus[menu]; ok {
return me.Name == name
}
return false
}
func (page *Page) Menus() PageMenus {
ret := PageMenus{}
if ms, ok := page.Params["menu"]; ok {
link, _ := page.Permalink()
me := MenuEntry{Name: page.LinkTitle(), Weight: page.Weight, Url: link}
// Could be the name of the menu to attach it to
mname, err := cast.ToStringE(ms)
if err == nil {
me.Menu = mname
ret[mname] = &me
return ret
}
// Could be an slice of strings
mnames, err := cast.ToStringSliceE(ms)
if err == nil {
for _, mname := range mnames {
me.Menu = mname
ret[mname] = &me
return ret
}
}
// Could be a structured menu entry
menus, err := cast.ToStringMapE(ms)
if err != nil {
jww.ERROR.Printf("unable to process menus for %q\n", page.Title)
}
for name, menu := range menus {
menuEntry := MenuEntry{Name: page.LinkTitle(), Url: link, Weight: page.Weight, Menu: name}
jww.DEBUG.Printf("found menu: %q, in %q\n", name, page.Title)
ime, err := cast.ToStringMapE(menu)
if err != nil {
jww.ERROR.Printf("unable to process menus for %q\n", page.Title)
}
menuEntry.MarshallMap(ime)
ret[name] = &menuEntry
}
return ret
}
return nil
}
func (p *Page) Render(layout ...string) template.HTML {
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curLayout := ""
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if len(layout) > 0 {
curLayout = layout[0]
}
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return bytesToHTML(p.ExecuteTemplate(curLayout).Bytes())
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}
func (p *Page) ExecuteTemplate(layout string) *bytes.Buffer {
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l := p.Layout(layout)
buffer := new(bytes.Buffer)
for _, layout := range l {
if p.Tmpl.Lookup(layout) != nil {
p.Tmpl.ExecuteTemplate(buffer, layout, p)
break
}
}
return buffer
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}
func (page *Page) guessMarkupType() string {
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// First try the explicitly set markup from the frontmatter
if page.Markup != "" {
format := guessType(page.Markup)
if format != "unknown" {
return format
}
}
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// Then try to guess from the extension
ext := strings.ToLower(path.Ext(page.FileName))
if strings.HasPrefix(ext, ".") {
return guessType(ext[1:])
}
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return "unknown"
}
func guessType(in string) string {
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switch strings.ToLower(in) {
case "md", "markdown", "mdown":
return "markdown"
case "rst":
return "rst"
case "html", "htm":
return "html"
}
return "unknown"
}
func (page *Page) detectFrontMatter() (f *parser.FrontmatterType) {
return parser.DetectFrontMatter(rune(page.frontmatter[0]))
}
func (page *Page) parse(reader io.Reader) error {
psr, err := parser.ReadFrom(reader)
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if err != nil {
return err
}
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page.renderable = psr.IsRenderable()
page.frontmatter = psr.FrontMatter()
meta, err := psr.Metadata()
if meta != nil {
if err != nil {
jww.ERROR.Printf("Error parsing page meta data for %s", page.FileName)
jww.ERROR.Println(err)
return err
}
if err = page.update(meta); err != nil {
return err
}
}
page.rawContent = psr.Content()
page.setSummary()
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return nil
}
func (page *Page) SetSourceContent(content []byte) {
page.sourceContent = content
}
func (page *Page) SetSourceMetaData(in interface{}, mark rune) (err error) {
by, err := parser.InterfaceToFrontMatter(in, mark)
if err != nil {
return err
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}
page.sourceFrontmatter = by
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return nil
}
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func (page *Page) SafeSaveSourceAs(path string) error {
return page.saveSourceAs(path, true)
}
func (page *Page) SaveSourceAs(path string) error {
return page.saveSourceAs(path, false)
}
func (page *Page) saveSourceAs(path string, safe bool) error {
b := new(bytes.Buffer)
b.Write(page.sourceFrontmatter)
b.Write(page.sourceContent)
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err := page.saveSource(b.Bytes(), path, safe)
if err != nil {
return err
}
return nil
}
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func (page *Page) saveSource(by []byte, inpath string, safe bool) (err error) {
if !path.IsAbs(inpath) {
inpath = helpers.AbsPathify(inpath)
}
jww.INFO.Println("creating", inpath)
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if safe {
err = helpers.SafeWriteToDisk(inpath, bytes.NewReader(by))
} else {
err = helpers.WriteToDisk(inpath, bytes.NewReader(by))
}
if err != nil {
return
}
return nil
}
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func (page *Page) SaveSource() error {
return page.SaveSourceAs(page.FullFilePath())
}
func (p *Page) ProcessShortcodes(t Template) {
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p.rawContent = []byte(ShortcodesHandle(string(p.rawContent), p, t))
p.Summary = template.HTML(ShortcodesHandle(string(p.Summary), p, t))
}
func (page *Page) Convert() error {
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markupType := page.guessMarkupType()
switch markupType {
case "markdown", "rst":
tmpContent, tmpTableOfContents := extractTOC(page.renderContent(RemoveSummaryDivider(page.rawContent)))
page.Content = bytesToHTML(tmpContent)
page.TableOfContents = bytesToHTML(tmpTableOfContents)
case "html":
page.Content = bytesToHTML(page.rawContent)
default:
return fmt.Errorf("Error converting unsupported file type '%s' for page '%s'", markupType, page.FileName)
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}
return nil
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}
func markdownRender(content []byte) []byte {
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htmlFlags := 0
htmlFlags |= blackfriday.HTML_SKIP_SCRIPT
htmlFlags |= blackfriday.HTML_USE_XHTML
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htmlFlags |= blackfriday.HTML_USE_SMARTYPANTS
htmlFlags |= blackfriday.HTML_SMARTYPANTS_FRACTIONS
htmlFlags |= blackfriday.HTML_SMARTYPANTS_LATEX_DASHES
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renderer := blackfriday.HtmlRenderer(htmlFlags, "", "")
extensions := 0
extensions |= blackfriday.EXTENSION_NO_INTRA_EMPHASIS
extensions |= blackfriday.EXTENSION_TABLES
extensions |= blackfriday.EXTENSION_FENCED_CODE
extensions |= blackfriday.EXTENSION_AUTOLINK
extensions |= blackfriday.EXTENSION_STRIKETHROUGH
extensions |= blackfriday.EXTENSION_SPACE_HEADERS
return blackfriday.Markdown(content, renderer, extensions)
}
func markdownRenderWithTOC(content []byte) []byte {
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htmlFlags := 0
htmlFlags |= blackfriday.HTML_SKIP_SCRIPT
htmlFlags |= blackfriday.HTML_TOC
htmlFlags |= blackfriday.HTML_USE_XHTML
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htmlFlags |= blackfriday.HTML_USE_SMARTYPANTS
htmlFlags |= blackfriday.HTML_SMARTYPANTS_FRACTIONS
htmlFlags |= blackfriday.HTML_SMARTYPANTS_LATEX_DASHES
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renderer := blackfriday.HtmlRenderer(htmlFlags, "", "")
extensions := 0
extensions |= blackfriday.EXTENSION_NO_INTRA_EMPHASIS
extensions |= blackfriday.EXTENSION_TABLES
extensions |= blackfriday.EXTENSION_FENCED_CODE
extensions |= blackfriday.EXTENSION_AUTOLINK
extensions |= blackfriday.EXTENSION_STRIKETHROUGH
extensions |= blackfriday.EXTENSION_SPACE_HEADERS
return blackfriday.Markdown(content, renderer, extensions)
}
func extractTOC(content []byte) (newcontent []byte, toc []byte) {
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origContent := make([]byte, len(content))
copy(origContent, content)
first := []byte(`<nav>
<ul>`)
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last := []byte(`</ul>
</nav>`)
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replacement := []byte(`<nav id="TableOfContents">
<ul>`)
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startOfTOC := bytes.Index(content, first)
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peekEnd := len(content)
if peekEnd > 70+startOfTOC {
peekEnd = 70 + startOfTOC
}
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if startOfTOC < 0 {
return stripEmptyNav(content), toc
}
// Need to peek ahead to see if this nav element is actually the right one.
correctNav := bytes.Index(content[startOfTOC:peekEnd], []byte(`#toc_0`))
if correctNav < 0 { // no match found
return content, toc
}
lengthOfTOC := bytes.Index(content[startOfTOC:], last) + len(last)
endOfTOC := startOfTOC + lengthOfTOC
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newcontent = append(content[:startOfTOC], content[endOfTOC:]...)
toc = append(replacement, origContent[startOfTOC+len(first):endOfTOC]...)
return
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}
func ReaderToBytes(lines io.Reader) []byte {
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b := new(bytes.Buffer)
b.ReadFrom(lines)
return b.Bytes()
}
func (p *Page) FullFilePath() string {
return path.Join(p.Dir, p.FileName)
}
func (p *Page) TargetPath() (outfile string) {
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// Always use Url if it's specified
if len(strings.TrimSpace(p.Url)) > 2 {
outfile = strings.TrimSpace(p.Url)
if strings.HasSuffix(outfile, "/") {
outfile = outfile + "index.html"
}
return
}
// If there's a Permalink specification, we use that
if override, ok := p.Site.Permalinks[p.Section]; ok {
var err error
outfile, err = override.Expand(p)
if err == nil {
if strings.HasSuffix(outfile, "/") {
outfile += "index.html"
}
return
}
}
if len(strings.TrimSpace(p.Slug)) > 0 {
outfile = strings.TrimSpace(p.Slug) + "." + p.Extension
} else {
// Fall back to filename
_, t := path.Split(p.FileName)
outfile = helpers.ReplaceExtension(strings.TrimSpace(t), p.Extension)
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}
return path.Join(p.Dir, strings.TrimSpace(outfile))
}