From 219a850d93374beb77ad85661efe76cbffc07709 Mon Sep 17 00:00:00 2001
From: ryan <kuyoeku@gmail.com>
Date: Thu, 27 Aug 2026 16:58:41 +0800
Subject: [PATCH] =?UTF-8?q?fix(=E9=92=89=E9=92=89=E9=80=9A=E7=9F=A5):=20?=
 =?UTF-8?q?=E4=BF=AE=E5=A4=8D=20Markdown=20=E6=B6=88=E6=81=AF=E6=8D=A2?=
 =?UTF-8?q?=E8=A1=8C=E8=A2=AB=E6=8A=98=E5=8F=A0=E5=AF=BC=E8=87=B4=E6=8E=92?=
 =?UTF-8?q?=E7=89=88=E9=94=99=E4=B9=B1=E7=9A=84=E9=97=AE=E9=A2=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Motivation:
钉钉 Markdown 渲染时会将单个换行符折叠为空格，导致推送的通知内容被压缩成一行，严重影响消息可读性。

Changes:

* 发送前将消息正文中的单个换行统一转换为段落分隔（\n\n），确保模板换行在钉钉中正确渲染
* 归一化 \r\n 与 \r 换行，并合并已有连续换行，避免产生多余空行
* 新增换行转换逻辑的单元测试
---
 internal/adapter/dingtalk.go      | 15 ++++++++++++++-
 internal/adapter/dingtalk_test.go |  9 +++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/internal/adapter/dingtalk.go b/internal/adapter/dingtalk.go
index 5f4cd03..7e5a467 100644
--- a/internal/adapter/dingtalk.go
+++ b/internal/adapter/dingtalk.go
@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"strings"
 	"time"
 )
 
@@ -69,7 +70,7 @@ func (s *DingTalkSender) Send(title, content string, config json.RawMessage) err
 		MsgType: "markdown",
 		Markdown: &dingtalkMD{
 			Title: title,
-			Text:  content,
+			Text:  dingtalkMarkdownText(content),
 		},
 	}
 
@@ -86,6 +87,18 @@ func (s *DingTalkSender) Send(title, content string, config json.RawMessage) err
 	return nil
 }
 
+// dingtalkMarkdownText turns template newlines into DingTalk markdown paragraph
+// breaks. A single \n is collapsed to a space by DingTalk markdown, so each
+// logical line must be separated by \n\n.
+func dingtalkMarkdownText(content string) string {
+	content = strings.ReplaceAll(content, "\r\n", "\n")
+	content = strings.ReplaceAll(content, "\r", "\n")
+	for strings.Contains(content, "\n\n") {
+		content = strings.ReplaceAll(content, "\n\n", "\n")
+	}
+	return strings.ReplaceAll(content, "\n", "\n\n")
+}
+
 func dingtalkSign(timestamp int64, secret string) string {
 	mac := hmac.New(sha256.New, []byte(secret))
 	fmt.Fprintf(mac, "%d\n%s", timestamp, secret)
diff --git a/internal/adapter/dingtalk_test.go b/internal/adapter/dingtalk_test.go
index 0716e19..bb00def 100644
--- a/internal/adapter/dingtalk_test.go
+++ b/internal/adapter/dingtalk_test.go
@@ -2,6 +2,15 @@ package adapter
 
 import "testing"
 
+func TestDingTalkMarkdownTextDoublesNewlines(t *testing.T) {
+	in := "空单开仓\n交易品种: ETHUSDT\n开仓价格: 2542.33\n\n推送时间: 2026.08.27 16:30:12"
+	got := dingtalkMarkdownText(in)
+	want := "空单开仓\n\n交易品种: ETHUSDT\n\n开仓价格: 2542.33\n\n推送时间: 2026.08.27 16:30:12"
+	if got != want {
+		t.Fatalf("got %q\nwant %q", got, want)
+	}
+}
+
 func TestDingtalkConfigWebhookURL(t *testing.T) {
 	tests := []struct {
 		name    string