internal/content/posts.go (view raw)
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import (
"bytes"
"context"
"io"
"os"
"path"
"path/filepath"
"slices"
"strings"
"time"
"go.alanpearce.eu/x/log"
"github.com/adrg/frontmatter"
mapset "github.com/deckarep/golang-set/v2"
fences "github.com/stefanfritsch/goldmark-fences"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/extension"
htmlrenderer "github.com/yuin/goldmark/renderer/html"
"gitlab.com/tozd/go/errors"
)
type PostMatter struct {
Date time.Time
Description string
Title string
Taxonomies struct {
Tags []string
}
}
type Post struct {
Input string
Output string
Basename string
URL string
*PostMatter
content []byte
}
type Config struct {
Root string
InputDir string
}
type PostsCollection struct {
config *Config
Posts []Post
Tags mapset.Set[string]
}
var markdown = goldmark.New(
goldmark.WithRendererOptions(
htmlrenderer.WithUnsafe(),
),
goldmark.WithExtensions(
extension.GFM,
extension.Footnote,
extension.Typographer,
&fences.Extender{},
),
)
var outputReplacer = strings.NewReplacer(
"index.md", "index.html",
".md", "/index.html",
)
var urlReplacer = strings.NewReplacer(
"index.md", "",
".md", "/",
)
func (pc *PostsCollection) GetPost(filename string) (*Post, error) {
fp := filepath.Join(pc.config.Root, filename)
url := path.Join("/", urlReplacer.Replace(filename)) + "/"
post := &Post{
Input: fp,
Output: path.Join(pc.config.InputDir, outputReplacer.Replace(filename)),
Basename: filepath.Base(url),
URL: url,
PostMatter: &PostMatter{},
}
content, err := os.Open(fp)
if err != nil {
return nil, errors.WithMessagef(err, "could not open post %s", fp)
}
defer content.Close()
post.content, err = frontmatter.Parse(content, post.PostMatter)
if err != nil {
return nil, errors.WithMessagef(
err,
"could not parse front matter of post %s",
fp,
)
}
return post, nil
}
// implements templ.Component
func (p *Post) Render(_ context.Context, w io.Writer) error {
return markdown.Convert(p.content, w)
}
func (p *Post) RenderString() (string, error) {
var buf bytes.Buffer
if err := p.Render(context.Background(), &buf); err != nil {
return "", errors.WithMessage(err, "could not convert markdown content")
}
return buf.String(), nil
}
func NewPostsCollection(config *Config, log *log.Logger) (*PostsCollection, error) {
pc := &PostsCollection{
Posts: []Post{},
Tags: mapset.NewSet[string](),
config: config,
}
log.Debug("reading posts", "root", config.Root, "input_dir", config.InputDir)
subdir := filepath.Join(config.Root, config.InputDir)
files, err := os.ReadDir(subdir)
if err != nil {
return nil, errors.WithMessagef(err, "could not read post directory %s", subdir)
}
for _, f := range files {
fn := f.Name()
if !f.IsDir() && path.Ext(fn) == ".md" {
log.Debug("reading post", "post", fn)
post, err := pc.GetPost(filepath.Join(config.InputDir, fn))
if err != nil {
return nil, err
}
for _, tag := range post.PostMatter.Taxonomies.Tags {
pc.Tags.Add(strings.ToLower(tag))
}
pc.Posts = append(pc.Posts, *post)
}
}
slices.SortFunc(pc.Posts, func(a, b Post) int {
return b.Date.Compare(a.Date)
})
return pc, nil
}
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