From 85920b8c7a2696115d1f77c046f48f6f00d639f1 Mon Sep 17 00:00:00 2001
From: ivar <i@oiee.no>
Date: Tue, 7 Apr 2026 00:23:24 +0200
Subject: Init

---
 internal/builder/editorjs.go | 255 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 255 insertions(+)
 create mode 100644 internal/builder/editorjs.go

(limited to 'internal/builder')

diff --git a/internal/builder/editorjs.go b/internal/builder/editorjs.go
new file mode 100644
index 0000000..68237d0
--- /dev/null
+++ b/internal/builder/editorjs.go
@@ -0,0 +1,255 @@
+package builder
+
+import (
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"strings"
+)
+
+// PageData is passed to HTML templates when rendering posts.
+type PageData struct {
+	Title            string
+	Content          template.HTML
+	ComponentScripts []string
+	Date             string
+	Tags             []string
+	Path             string
+}
+
+type EditorDocument struct {
+	Version string        `json:"version"`
+	Time    int64         `json:"time"`
+	Blocks  []EditorBlock `json:"blocks"`
+}
+
+type EditorBlock struct {
+	Type string          `json:"type"`
+	Data json.RawMessage `json:"data"`
+}
+
+// RenderEditorJS converts EditorJS block JSON to HTML and extracts script URLs.
+// Returns the rendered HTML body, script URLs, and any error.
+func RenderEditorJS(blocksJSON string) (html string, scripts []string, err error) {
+	if blocksJSON == "" || blocksJSON == "[]" {
+		return "", nil, nil
+	}
+
+	var doc EditorDocument
+	if err := json.Unmarshal([]byte(blocksJSON), &doc); err != nil {
+		return "", nil, err
+	}
+
+	var buf strings.Builder
+	var scriptURLs []string
+
+	for _, block := range doc.Blocks {
+		blockHTML, blockScripts, err := renderBlock(block)
+		if err != nil {
+			return "", nil, err
+		}
+		if blockHTML != "" {
+			buf.WriteString(blockHTML)
+		}
+		scriptURLs = append(scriptURLs, blockScripts...)
+	}
+
+	return buf.String(), scriptURLs, nil
+}
+
+func renderBlock(block EditorBlock) (html string, scripts []string, err error) {
+	switch block.Type {
+	case "paragraph":
+		return renderParagraph(block.Data)
+	case "header":
+		return renderHeader(block.Data)
+	case "image":
+		return renderImage(block.Data)
+	case "list":
+		return renderList(block.Data)
+	case "code":
+		return renderCode(block.Data)
+	case "quote":
+		return renderQuote(block.Data)
+	case "script":
+		return renderScript(block.Data)
+	case "component":
+		return renderComponent(block.Data)
+	default:
+		return "", nil, nil
+	}
+}
+
+func renderParagraph(data json.RawMessage) (string, []string, error) {
+	var d struct {
+		Text string `json:"text"`
+	}
+	if err := json.Unmarshal(data, &d); err != nil {
+		return "", nil, err
+	}
+	if strings.TrimSpace(d.Text) == "" {
+		return "", nil, nil
+	}
+	return fmt.Sprintf("<p>%s</p>\n", template.HTML(d.Text)), nil, nil
+}
+
+func renderHeader(data json.RawMessage) (string, []string, error) {
+	var d struct {
+		Text  string `json:"text"`
+		Level int    `json:"level"`
+	}
+	if err := json.Unmarshal(data, &d); err != nil {
+		return "", nil, err
+	}
+	if d.Level < 1 || d.Level > 6 {
+		d.Level = 2
+	}
+	if strings.TrimSpace(d.Text) == "" {
+		return "", nil, nil
+	}
+	return fmt.Sprintf("<h%d>%s</h%d>\n", d.Level, template.HTML(d.Text), d.Level), nil, nil
+}
+
+// renderImage renders an EditorJS image block.
+// The thumbhash (if present) is placed in data-thumbhash on the <figure> so
+// the client can decode it and use it as a blurry placeholder via JS.
+func renderImage(data json.RawMessage) (string, []string, error) {
+	var d struct {
+		File struct {
+			URL       string `json:"url"`
+			Thumbhash string `json:"thumbhash"`
+		} `json:"file"`
+		Caption string `json:"caption"`
+	}
+	if err := json.Unmarshal(data, &d); err != nil {
+		return "", nil, err
+	}
+	if d.File.URL == "" {
+		return "", nil, nil
+	}
+
+	alt := d.Caption
+	if alt == "" {
+		alt = "image"
+	}
+
+	var figAttrs string
+	if d.File.Thumbhash != "" {
+		figAttrs = fmt.Sprintf(` data-thumbhash="%s"`, template.HTMLEscapeString(d.File.Thumbhash))
+	}
+
+	var buf strings.Builder
+	fmt.Fprintf(&buf, "<figure%s>", figAttrs)
+	fmt.Fprintf(&buf, `<img src="%s" alt="%s" loading="lazy" decoding="async">`,
+		template.HTMLEscapeString(d.File.URL),
+		template.HTMLEscapeString(alt),
+	)
+	if d.Caption != "" {
+		fmt.Fprintf(&buf, "<figcaption>%s</figcaption>", template.HTML(d.Caption))
+	}
+	buf.WriteString("</figure>\n")
+	return buf.String(), nil, nil
+}
+
+type listItem struct {
+	Content string     `json:"content"`
+	Items   []listItem `json:"items"`
+}
+
+func renderList(data json.RawMessage) (string, []string, error) {
+	var d struct {
+		Style string     `json:"style"`
+		Items []listItem `json:"items"`
+	}
+	if err := json.Unmarshal(data, &d); err != nil {
+		return "", nil, err
+	}
+	if len(d.Items) == 0 {
+		return "", nil, nil
+	}
+	tag := "ul"
+	if d.Style == "ordered" {
+		tag = "ol"
+	}
+	var buf strings.Builder
+	renderListItems(&buf, d.Items, tag)
+	return buf.String(), nil, nil
+}
+
+func renderListItems(buf *strings.Builder, items []listItem, tag string) {
+	fmt.Fprintf(buf, "<%s>\n", tag)
+	for _, item := range items {
+		fmt.Fprintf(buf, "<li>%s", template.HTML(item.Content))
+		if len(item.Items) > 0 {
+			renderListItems(buf, item.Items, tag)
+		}
+		buf.WriteString("</li>\n")
+	}
+	fmt.Fprintf(buf, "</%s>\n", tag)
+}
+
+func renderCode(data json.RawMessage) (string, []string, error) {
+	var d struct {
+		Code string `json:"code"`
+	}
+	if err := json.Unmarshal(data, &d); err != nil {
+		return "", nil, err
+	}
+	if strings.TrimSpace(d.Code) == "" {
+		return "", nil, nil
+	}
+	return fmt.Sprintf("<pre><code>%s</code></pre>\n", template.HTMLEscapeString(d.Code)), nil, nil
+}
+
+func renderQuote(data json.RawMessage) (string, []string, error) {
+	var d struct {
+		Text    string `json:"text"`
+		Caption string `json:"caption"`
+	}
+	if err := json.Unmarshal(data, &d); err != nil {
+		return "", nil, err
+	}
+	if strings.TrimSpace(d.Text) == "" {
+		return "", nil, nil
+	}
+	var buf strings.Builder
+	fmt.Fprintf(&buf, "<blockquote>\n<p>%s</p>\n", template.HTML(d.Text))
+	if d.Caption != "" {
+		fmt.Fprintf(&buf, "<cite>%s</cite>\n", template.HTML(d.Caption))
+	}
+	buf.WriteString("</blockquote>\n")
+	return buf.String(), nil, nil
+}
+
+func renderScript(data json.RawMessage) (string, []string, error) {
+	var d struct {
+		Src string `json:"src"`
+	}
+	if err := json.Unmarshal(data, &d); err != nil {
+		return "", nil, err
+	}
+	if d.Src == "" {
+		return "", nil, nil
+	}
+	return "", []string{d.Src}, nil
+}
+
+func renderComponent(data json.RawMessage) (string, []string, error) {
+	var d struct {
+		Name  string            `json:"name"`
+		Props map[string]string `json:"props"`
+	}
+	if err := json.Unmarshal(data, &d); err != nil {
+		return "", nil, err
+	}
+	if d.Name == "" {
+		return "", nil, nil
+	}
+	var buf strings.Builder
+	fmt.Fprintf(&buf, "<%s", template.HTMLEscapeString(d.Name))
+	for k, v := range d.Props {
+		fmt.Fprintf(&buf, " %s=\"%s\"", template.HTMLEscapeString(k), template.HTMLEscapeString(v))
+	}
+	fmt.Fprintf(&buf, "></%s>\n", template.HTMLEscapeString(d.Name))
+	return buf.String(), []string{"/assets/components/" + d.Name + ".js"}, nil
+}
-- 
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