Init

lib/markdown.go

@@ -0,0 +1,65 @@
+package lib
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"io/fs"
+	"strings"
+
+	"github.com/yuin/goldmark"
+	"gopkg.in/yaml.v2"
+)
+
+type FrontMatter struct {
+	Name string
+	Date string
+	Tags []string
+}
+
+func ExtractFrontMatter(file fs.DirEntry, contentFS fs.FS) (CardLink, error) {
+	f, err := contentFS.Open(file.Name())
+	if err != nil {
+		return CardLink{}, fmt.Errorf("failed to open file: %w", err)
+	}
+	defer f.Close()
+
+	scanner := bufio.NewScanner(f)
+	var lines []string
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+	if err := scanner.Err(); err != nil {
+		return CardLink{}, fmt.Errorf("failed to read file: %w", err)
+	}
+
+	content := strings.Join(lines, "\n")
+	splitContent := strings.SplitN(content, "---", 3)
+	if len(splitContent) < 3 {
+		return CardLink{}, fmt.Errorf("invalid file format: %s", file.Name())
+	}
+
+	frontMatter := CardLink{}
+	if err := yaml.Unmarshal([]byte(splitContent[1]), &frontMatter); err != nil {
+		return CardLink{}, fmt.Errorf("failed to unmarshal frontmatter: %w", err)
+	}
+
+	md := goldmark.New(goldmark.WithExtensions())
+	var buf bytes.Buffer
+	if err := md.Convert([]byte(splitContent[2]), &buf); err != nil {
+		return CardLink{}, fmt.Errorf("failed to convert markdown: %w", err)
+	}
+
+	return frontMatter, nil
+}
+
+func SplitFrontmatter(md []byte) (frontmatter []byte, content []byte, err error) {
+	parts := bytes.SplitN(md, []byte("---"), 3)
+
+	if len(parts) < 3 {
+		return nil, nil, errors.New("invalid or missing frontmatter")
+	}
+
+	return parts[1], parts[2], nil
+}