internal/builder/template.go (view raw)
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import (
"bytes"
"encoding/xml"
"io"
"strings"
"text/template"
"go.alanpearce.eu/homestead/internal/atom"
"go.alanpearce.eu/homestead/internal/config"
"go.alanpearce.eu/homestead/internal/content"
"go.alanpearce.eu/homestead/templates"
"github.com/PuerkitoBio/goquery"
"github.com/antchfx/xmlquery"
"github.com/antchfx/xpath"
"gitlab.com/tozd/go/errors"
)
var (
nsMap = map[string]string{
"xsl": "http://www.w3.org/1999/XSL/Transform",
"atom": "http://www.w3.org/2005/Atom",
"xhtml": "http://www.w3.org/1999/xhtml",
}
)
type QuerySelection struct {
*goquery.Selection
}
type QueryDocument struct {
*goquery.Document
}
func NewDocumentFromReader(r io.Reader) (*QueryDocument, error) {
doc, err := goquery.NewDocumentFromReader(r)
return &QueryDocument{doc}, errors.WithMessage(err, "could not create query document")
}
func (q *QueryDocument) Find(selector string) *QuerySelection {
return &QuerySelection{q.Document.Find(selector)}
}
func renderRobotsTXT(config *config.Config) (io.Reader, error) {
r, w := io.Pipe()
tpl, err := template.ParseFS(templates.Files, "robots.tmpl")
if err != nil {
return nil, err
}
go func() {
err = tpl.Execute(w, map[string]interface{}{
"BaseURL": config.BaseURL,
})
if err != nil {
w.CloseWithError(err)
}
w.Close()
}()
return r, nil
}
func renderFeed(
title string,
config *config.Config,
posts []content.Post,
specific string,
) (io.WriterTo, error) {
buf := &bytes.Buffer{}
datetime := posts[0].Date.UTC()
buf.WriteString(xml.Header)
err := atom.LinkXSL(buf, "/feed-styles.xsl")
if err != nil {
return nil, err
}
feed := &atom.Feed{
Title: title,
Link: atom.MakeLink(config.BaseURL.URL),
ID: atom.MakeTagURI(config, specific),
Updated: datetime,
Entries: make([]*atom.FeedEntry, len(posts)),
}
for i, post := range posts {
html, err := post.RenderString()
if err != nil {
return nil, errors.WithMessage(err, "could not render post")
}
feed.Entries[i] = &atom.FeedEntry{
Title: post.Title,
Link: atom.MakeLink(config.BaseURL.JoinPath(post.URL)),
ID: atom.MakeTagURI(config, post.Basename),
Updated: post.Date.UTC(),
Summary: post.Description,
Author: config.Title,
Content: atom.FeedContent{
Content: html,
Type: "html",
},
}
}
enc := xml.NewEncoder(buf)
err = enc.Encode(feed)
if err != nil {
return nil, err
}
return buf, nil
}
func renderFeedStyles() (*strings.Reader, error) {
tpl, err := template.ParseFS(templates.Files, "feed-styles.xsl")
if err != nil {
return nil, err
}
esc := &strings.Builder{}
err = xml.EscapeText(esc, []byte(templates.CSS))
if err != nil {
return nil, err
}
w := &strings.Builder{}
err = tpl.Execute(w, map[string]interface{}{
"css": esc.String(),
})
if err != nil {
return nil, err
}
return strings.NewReader(w.String()), nil
}
func getFeedStylesHash(r io.Reader) (string, error) {
doc, err := xmlquery.Parse(r)
if err != nil {
return "", err
}
expr, err := xpath.CompileWithNS("//xhtml:style", nsMap)
if err != nil {
return "", errors.WithMessage(err, "could not parse XPath")
}
style := xmlquery.QuerySelector(doc, expr)
return hash(style.InnerText()), nil
}
func getHTMLStyleHash(r io.Reader) (string, error) {
doc, err := NewDocumentFromReader(r)
if err != nil {
return "", err
}
html := doc.Find("head > style").Text()
return hash(html), nil
}
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