From fc129c8a6af2734828bc8a0d7fcd2ffa83f58c16 Mon Sep 17 00:00:00 2001
From: Liang Ding <d@b3log.org>
Date: Sat, 17 Dec 2022 11:53:11 +0800
Subject: [PATCH] =?UTF-8?q?:art:=20=E5=AF=BC=E5=87=BA=20Markdown=20?=
 =?UTF-8?q?=E6=96=87=E4=BB=B6=E6=97=B6=E5=BC=80=E5=A4=B4=E9=99=84=E4=B8=8A?=
 =?UTF-8?q?=E4=B8=80=E4=BA=9B=E5=85=83=E6=95=B0=E6=8D=AE=20Fix=20https://g?=
 =?UTF-8?q?ithub.com/siyuan-note/siyuan/issues/6880?=
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---
 kernel/model/export.go | 58 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/kernel/model/export.go b/kernel/model/export.go
index 8a6d3a5b3..d26e8085b 100644
--- a/kernel/model/export.go
+++ b/kernel/model/export.go
@@ -28,6 +28,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"time"
 	"unicode/utf8"
 
 	"github.com/88250/gulu"
@@ -684,6 +685,7 @@ func exportMarkdownZip(boxID, baseFolderName string, docPaths []string) (zipPath
 
 		id := docIAL["id"]
 		hPath, md := exportMarkdownContent(id)
+		md = yfm(docIAL) + md
 		dir, name = path.Split(hPath)
 		dir = util.FilterFilePath(dir) // 导出文档时未移除不支持的文件名符号 https://github.com/siyuan-note/siyuan/issues/4590
 		name = util.FilterFileName(name)
@@ -769,6 +771,62 @@ func exportMarkdownZip(boxID, baseFolderName string, docPaths []string) (zipPath
 	return
 }
 
+func yfm(docIAL map[string]string) string {
+	// 导出 Markdown 文件时开头附上一些元数据 https://github.com/siyuan-note/siyuan/issues/6880
+
+	buf := bytes.Buffer{}
+	buf.WriteString("---\n")
+	var title, created, updated, tags string
+	for k, v := range docIAL {
+		if "id" == k {
+			createdTime, parseErr := time.Parse("20060102150405", util.TimeFromID(v))
+			if nil == parseErr {
+				created = createdTime.Format(time.RFC3339)
+			}
+			continue
+		}
+		if "title" == k {
+			title = v
+			continue
+		}
+		if "updated" == k {
+			updatedTime, parseErr := time.Parse("20060102150405", v)
+			if nil == parseErr {
+				updated = updatedTime.Format(time.RFC3339)
+			}
+			continue
+		}
+		if "tags" == k {
+			tags = v
+			continue
+		}
+	}
+	if "" != title {
+		buf.WriteString("title: ")
+		buf.WriteString(title)
+		buf.WriteString("\n")
+	}
+	if "" == updated {
+		updated = time.Now().Format(time.RFC3339)
+	}
+	if "" == created {
+		created = updated
+	}
+	buf.WriteString("created: ")
+	buf.WriteString(created)
+	buf.WriteString("\n")
+	buf.WriteString("updated: ")
+	buf.WriteString(updated)
+	buf.WriteString("\n")
+	if "" != tags {
+		buf.WriteString("tags: [")
+		buf.WriteString(tags)
+		buf.WriteString("]\n")
+	}
+	buf.WriteString("---\n\n")
+	return buf.String()
+}
+
 func exportBoxSYZip(boxID string) (zipPath string) {
 	box := Conf.Box(boxID)
 	if nil == box {