1package markdown
 2
 3import (
 4	"os"
 5	"path/filepath"
 6	"text/template"
 7	"time"
 8
 9	bfc "github.com/Depado/bfchroma"
10	bf "github.com/russross/blackfriday/v2"
11)
12
13var bfFlags = bf.UseXHTML | bf.Smartypants | bf.SmartypantsFractions |
14	bf.SmartypantsDashes | bf.NofollowLinks
15var bfExts = bf.NoIntraEmphasis | bf.Tables | bf.FencedCode | bf.Autolink |
16	bf.Strikethrough | bf.SpaceHeadings | bf.BackslashLineBreak |
17	bf.HeadingIDs | bf.Footnotes | bf.NoEmptyLineBeforeBlock
18
19type Output struct {
20	HTML []byte
21	Meta Matter
22}
23
24// Renders markdown to html, and fetches metadata.
25func (out *Output) RenderMarkdown(source []byte) {
26	md := MarkdownDoc{}
27	md.Extract(source)
28
29	out.HTML = bf.Run(
30		md.Body,
31		bf.WithRenderer(
32			bfc.NewRenderer(
33				bfc.ChromaStyle(Icy),
34				bfc.Extend(
35					bf.NewHTMLRenderer(bf.HTMLRendererParameters{
36						Flags: bfFlags,
37					}),
38				),
39			),
40		),
41		bf.WithExtensions(bfExts),
42	)
43	out.Meta = md.Frontmatter
44}
45
46// Renders out.HTML into dst html file, using the template specified
47// in the frontmatter. data is the template struct.
48func (out *Output) RenderHTML(dst, tmplDir string, data interface{}) error {
49	metaTemplate := out.Meta["template"]
50	if metaTemplate == "" {
51		metaTemplate = "text.html"
52	}
53
54	t, err := template.New("").Funcs(template.FuncMap{
55		"parsedate": func(s string) time.Time {
56			date, _ := time.Parse("2006-01-02", s)
57			return date
58		},
59	}).ParseGlob(filepath.Join(tmplDir, "*.html"))
60	if err != nil {
61		return err
62	}
63
64	w, err := os.Create(dst)
65	if err != nil {
66		return err
67	}
68
69	if err = t.ExecuteTemplate(w, metaTemplate, data); err != nil {
70		return err
71	}
72	return nil
73}