feat(frontmatter): parsing and tag extract

core/frontmatter/parser.go

@@ -3,10 +3,20 @@ package frontmatter
 import (
 	"bufio"
 	"bytes"
+	"encoding/json"
 	"errors"
 	"io"
 )
 
+type FrontMatter struct {
+	Title   string
+	Tags    []string
+	Created string
+	Updated string
+	Author  string
+
+}
+
 func ParseFrontMatter(r io.Reader) (map[string]string, error) {
 	scanner := bufio.NewScanner(r)
 	frontMatter := make(map[string]string)
@@ -31,3 +41,16 @@ func ParseFrontMatter(r io.Reader) (map[string]string, error) {
 
 	return frontMatter, nil
 }
+
+func ExtractTags(frontMatter map[string]string) ([]string, error) {
+	tagsStr, ok := frontMatter["tags"]
+	if !ok {
+		return nil, errors.New("tags not found in front matter")
+	}
+	var tags []string
+	err := json.Unmarshal([]byte(tagsStr), &tags)
+	if err != nil {
+		return nil, err
+	}
+	return tags, nil
+}

test/doc.go

@@ -1,2 +0,0 @@
-// Package test contains all test files for the project.
-package test

test/frontmatter_test.go

@@ -1,4 +1,4 @@
-package test
+package frontmatter_test
 
 import (
 	"strings"
@@ -31,3 +31,26 @@ This is the content of the note.`
 		}
 	}
 }
+
+func TestExtractTags(t *testing.T) {
+	frontMatter := map[string]string{
+		"tags": `["test", "note"]`,
+	}
+
+	expected := []string{"test", "note"}
+
+	result, err := frontmatter.ExtractTags(frontMatter)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if len(result) != len(expected) {
+		t.Fatalf("expected %d tags, got %d", len(expected), len(result))
+	}
+
+	for i, expectedTag := range expected {
+		if result[i] != expectedTag {
+			t.Errorf("expected tag %d to be %s, got %s", i, expectedTag, result[i])
+		}
+	}
+}