Started working on the frontend

- Added the new post frontend
- Hooked up publishing of posts to the site publisher
- Added an site exporter as a publishing target

providers/siteexporter/exporter.go

@@ -0,0 +1,80 @@
+package siteexporter
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"gopkg.in/yaml.v3"
+	"lmika.dev/lmika/weiro/handlers/importexport"
+	"lmika.dev/lmika/weiro/models"
+)
+
+type SiteExporter struct {
+	site    models.Site
+	baseURL string
+	baseDir string
+}
+
+func New(site models.Site, baseURL, baseDir string) *SiteExporter {
+	return &SiteExporter{
+		site:    site,
+		baseDir: baseDir,
+		baseURL: baseURL,
+	}
+}
+
+func (s *SiteExporter) WriteSiteYAML() error {
+	siteYAML := importexport.Site{
+		Title:   s.site.Title,
+		Tagline: s.site.Tagline,
+		BaseURL: s.baseURL,
+	}
+
+	bytes, err := yaml.Marshal(siteYAML)
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(filepath.Join(s.baseDir, "site.yaml"), bytes, 0644)
+}
+
+func (s *SiteExporter) WritePost(post *models.Post) error {
+	postMeta := importexport.Post{
+		ID:    post.GUID,
+		Title: post.Title,
+		Date:  post.PublishedAt,
+		Slug:  post.Slug,
+	}
+	frontMatter, err := yaml.Marshal(postMeta)
+
+	slugBasePath := filepath.Base(post.Slug)
+	postFilename := filepath.Join(s.baseDir, fmt.Sprintf("posts/%04d/%02d/%02d-%s.md",
+		post.PublishedAt.Year(), post.PublishedAt.Month(), post.PublishedAt.Day(), slugBasePath))
+
+	if err := os.MkdirAll(filepath.Dir(postFilename), 0755); err != nil {
+		return err
+	}
+
+	f, err := os.Create(postFilename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	if _, err := f.WriteString("---\n"); err != nil {
+		return err
+	}
+
+	if _, err = f.Write(frontMatter); err != nil {
+		return err
+	}
+
+	_, err = f.WriteString("---\n")
+	if err != nil {
+		return err
+	}
+
+	_, err = f.WriteString(post.Body)
+	return err
+}