116 lines
2.6 KiB
Go
116 lines
2.6 KiB
Go
package blog
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import (
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"bytes"
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"html/template"
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"strings"
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"time"
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chromahtml "github.com/alecthomas/chroma/v2/formatters/html"
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highlighting "github.com/yuin/goldmark-highlighting/v2"
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"github.com/yuin/goldmark"
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"github.com/yuin/goldmark/extension"
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"github.com/yuin/goldmark/parser"
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"github.com/yuin/goldmark/renderer/html"
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"gopkg.in/yaml.v3"
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)
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// FrontMatter is the YAML block at the top of a post file.
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type FrontMatter struct {
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Title string `yaml:"title"`
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Date string `yaml:"date"`
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Tags []string `yaml:"tags"`
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Slug string `yaml:"slug"`
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Draft bool `yaml:"draft"`
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Description string `yaml:"description"`
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}
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// Post is a parsed blog post with rendered HTML content.
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type Post struct {
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FrontMatter
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ParsedDate time.Time
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Content template.HTML
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Slug string
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}
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// RenderMarkdown converts a markdown string to HTML.
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func RenderMarkdown(src string) (template.HTML, error) {
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md := goldmark.New(
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goldmark.WithExtensions(
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extension.GFM,
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extension.Footnote,
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extension.DefinitionList,
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extension.Strikethrough,
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extension.Table,
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highlighting.NewHighlighting(
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highlighting.WithFormatOptions(
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chromahtml.WithClasses(true),
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),
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),
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),
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goldmark.WithParserOptions(
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parser.WithAutoHeadingID(),
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),
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goldmark.WithRendererOptions(
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html.WithXHTML(),
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),
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)
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var buf bytes.Buffer
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if err := md.Convert([]byte(src), &buf); err != nil {
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return "", err
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}
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return template.HTML(buf.String()), nil
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}
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// ParsePost parses raw markdown bytes (with optional YAML frontmatter) into a Post.
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// filename is the bare filename (e.g. "my-post.md") used to derive the slug if not set.
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func ParsePost(raw []byte, filename string) (*Post, error) {
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content := string(raw)
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var fm FrontMatter
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var markdownContent string
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if strings.HasPrefix(content, "---") {
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// Find closing ---
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rest := content[3:]
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idx := strings.Index(rest, "\n---")
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if idx >= 0 {
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fmRaw := rest[:idx]
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if err := yaml.Unmarshal([]byte(fmRaw), &fm); err != nil {
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return nil, err
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}
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markdownContent = strings.TrimSpace(rest[idx+4:])
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} else {
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markdownContent = content
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}
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} else {
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markdownContent = content
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}
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htmlContent, err := RenderMarkdown(markdownContent)
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if err != nil {
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return nil, err
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}
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slug := fm.Slug
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if slug == "" {
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slug = strings.TrimSuffix(filename, ".md")
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}
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var parsedDate time.Time
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if fm.Date != "" {
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for _, layout := range []string{"2006-01-02", "2006-01-02T15:04:05Z07:00"} {
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if t, err := time.Parse(layout, fm.Date); err == nil {
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parsedDate = t
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break
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}
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}
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}
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return &Post{
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FrontMatter: fm,
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ParsedDate: parsedDate,
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Content: htmlContent,
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Slug: slug,
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}, nil
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}
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