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package content
import (
"bytes"
"os"
"path"
"path/filepath"
"slices"
"strings"
"time"
"go.alanpearce.eu/website/internal/log"
"github.com/adrg/frontmatter"
mapset "github.com/deckarep/golang-set/v2"
"gitlab.com/tozd/go/errors"
fences "github.com/stefanfritsch/goldmark-fences"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/extension"
htmlrenderer "github.com/yuin/goldmark/renderer/html"
)
type PostMatter struct {
Date time.Time `toml:"date"`
Description string `toml:"description"`
Title string `toml:"title"`
Taxonomies struct {
Tags []string `toml:"tags"`
} `toml:"taxonomies"`
}
type Post struct {
Input string
Output string
Basename string
URL string
Content string
PostMatter
}
type Tags mapset.Set[string]
var markdown = goldmark.New(
goldmark.WithRendererOptions(
htmlrenderer.WithUnsafe(),
),
goldmark.WithExtensions(
extension.GFM,
extension.Footnote,
extension.Typographer,
&fences.Extender{},
),
)
func GetPost(filename string) (*PostMatter, []byte, error) {
matter := PostMatter{}
content, err := os.Open(filename)
if err != nil {
return nil, nil, errors.WithMessagef(err, "could not open post %s", filename)
}
defer content.Close()
rest, err := frontmatter.MustParse(content, &matter)
if err != nil {
return nil, nil, errors.WithMessagef(
err,
"could not parse front matter of post %s",
filename,
)
}
return &matter, rest, nil
}
func RenderMarkdown(content []byte) (string, error) {
var buf bytes.Buffer
if err := markdown.Convert(content, &buf); err != nil {
return "", errors.WithMessage(err, "could not convert markdown content")
}
return buf.String(), nil
}
func ReadPosts(root string, inputDir string, outputDir string) ([]Post, Tags, error) {
tags := mapset.NewSet[string]()
posts := []Post{}
subdir := filepath.Join(root, inputDir)
files, err := os.ReadDir(subdir)
if err != nil {
return nil, nil, errors.WithMessagef(err, "could not read post directory %s", subdir)
}
outputReplacer := strings.NewReplacer(root, outputDir, ".md", "/index.html")
urlReplacer := strings.NewReplacer(root, "", ".md", "/")
for _, f := range files {
pathFromRoot := filepath.Join(subdir, f.Name())
if !f.IsDir() && path.Ext(pathFromRoot) == ".md" {
output := outputReplacer.Replace(pathFromRoot)
url := urlReplacer.Replace(pathFromRoot)
log.Debug("reading post", "post", pathFromRoot)
matter, content, err := GetPost(pathFromRoot)
if err != nil {
return nil, nil, err
}
for _, tag := range matter.Taxonomies.Tags {
tags.Add(strings.ToLower(tag))
}
log.Debug("rendering markdown in post", "post", pathFromRoot)
html, err := RenderMarkdown(content)
if err != nil {
return nil, nil, err
}
post := Post{
Input: pathFromRoot,
Output: output,
Basename: filepath.Base(url),
URL: url,
PostMatter: *matter,
Content: html,
}
posts = append(posts, post)
}
}
slices.SortFunc(posts, func(a, b Post) int {
return b.Date.Compare(a.Date)
})
return posts, tags, nil
}
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