Space from config and title from h1 (#153)

* Add option to define Space.
Add option to use H1 heading to define page title.

* Update readme

pkg/mark/markdown.go

@@ -147,3 +147,14 @@ func DropDocumentLeadingH1(
 	markdown = h1.ReplaceAll(markdown, []byte(""))
 	return markdown
 }
+
+// ExtractDocumentLeadingH1 will extract leading H1 heading
+func ExtractDocumentLeadingH1(markdown []byte) string {
+	h1 := regexp.MustCompile(`^#[^#]\s*(.*)\s*\n`)
+	groups := h1.FindSubmatch(markdown)
+	if groups == nil {
+		return ""
+	} else {
+		return string(groups[1])
+	}
+}

pkg/mark/markdown_test.go

@@ -48,3 +48,16 @@ func TestCompileMarkdown(t *testing.T) {
 		test.EqualValues(string(html), actual, filename+" vs "+htmlname)
 	}
 }
+
+func TestExtractDocumentLeadingH1(t *testing.T) {
+	filename := "testdata/header.md"
+
+	markdown, err := ioutil.ReadFile(filename)
+	if err != nil {
+		panic(err)
+	}
+
+	actual := ExtractDocumentLeadingH1(markdown)
+
+	assert.Equal(t, "a", actual)
+}

pkg/mark/meta.go

@@ -128,19 +128,5 @@ func ExtractMeta(data []byte) (*Meta, []byte, error) {
 		return nil, data, nil
 	}
 
-	if meta.Space == "" {
-		return nil, nil, fmt.Errorf(
-			"space key is not set (%s header is not set)",
-			HeaderSpace,
-		)
-	}
-
-	if meta.Title == "" {
-		return nil, nil, fmt.Errorf(
-			"page title is not set (%s header is not set)",
-			HeaderTitle,
-		)
-	}
-
 	return meta, data[offset:], nil
 }