mirror of
https://github.com/danog/gojekyll.git
synced 2024-11-30 08:28:58 +01:00
95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
package plugins
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import (
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"bytes"
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"text/template"
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)
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type jekyllRedirectFromPlugin struct{ plugin }
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var redirectTemplate *template.Template
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func init() {
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register("jekyll-redirect-from", jekyllRedirectFromPlugin{})
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tmpl, err := template.New("redirect_from").Parse(redirectFromTemplateSource)
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if err != nil {
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panic(err)
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}
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redirectTemplate = tmpl
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}
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func (p jekyllRedirectFromPlugin) PostReadSite(s Site) error {
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ps := s.Pages()
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addRedirects, err := p.processRedirectFrom(s, ps)
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if err != nil {
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return err
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}
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if err := p.processRedirectTo(s, ps); err != nil {
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return err
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}
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addRedirects()
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return nil
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}
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func (p jekyllRedirectFromPlugin) processRedirectFrom(s Site, ps []Page) (func(), error) {
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var (
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cfg = s.Config()
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siteurl = cfg.AbsoluteURL
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baseurl = cfg.BaseURL
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prefix = siteurl + baseurl
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redirects = []func(){}
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)
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addRedirectFrom := func(from string, to Page) {
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f := func() {
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s.AddHTMLPage(from, createRedirectionHTML(prefix+to.URL()), nil)
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}
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redirects = append(redirects, f)
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}
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for _, p := range ps {
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for _, from := range p.FrontMatter().StringArray("redirect_from") {
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addRedirectFrom(from, p)
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}
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}
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return func() {
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for _, f := range redirects {
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f()
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}
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}, nil
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}
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func (p jekyllRedirectFromPlugin) processRedirectTo(_ Site, ps []Page) error {
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for _, p := range ps {
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sources := p.FrontMatter().StringArray("redirect_to")
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if len(sources) > 0 {
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p.SetContent(createRedirectionHTML(sources[0]))
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}
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}
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return nil
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}
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func createRedirectionHTML(to string) string {
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r := redirection{to}
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buf := new(bytes.Buffer)
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if err := redirectTemplate.Execute(buf, r); err != nil {
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panic(err)
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}
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return buf.String()
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}
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type redirection struct {
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To string
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}
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// Adapted from https://github.com/jekyll/jekyll-redirect-from
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const redirectFromTemplateSource = `<!DOCTYPE html>
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<html lang="en-US">
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<meta charset="utf-8">
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<title>Redirecting…</title>
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<link rel="canonical" href="{{.To}}">
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<meta http-equiv="refresh" content="0; url={{.To}}">
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<meta name="robots" content="noindex">
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<h1>Redirecting…</h1>
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<a href="{{.To}}">Click here if you are not redirected.</a>
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<script>location="{{.To}}"</script>
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</html>`
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