Only provide the commit summary for Discord webhook push events (go-gitea#32432)

Resolves go-gitea#32371.

go-gitea#31970 should have just showed the commit summary, but
`strings.SplitN()` was misused such that we did not perform any
splitting at all and just used the message. This was not caught in the
unit test made in that PR since the test commit summary was > 50 (which
truncated away the commit description).

This snapshot resolves this and adds another unit test to ensure that we
only show the commit summary.

Author: kemzeb

services/webhook/discord.go

@@ -151,7 +151,7 @@ func (d discordConvertor) Push(p *api.PushPayload) (DiscordPayload, error) {
 	// for each commit, generate attachment text
 	for i, commit := range p.Commits {
 		// limit the commit message display to just the summary, otherwise it would be hard to read
-		message := strings.TrimRight(strings.SplitN(commit.Message, "\n", 1)[0], "\r")
+		message := strings.TrimRight(strings.SplitN(commit.Message, "\n", 2)[0], "\r")
 
 		// a limit of 50 is set because GitHub does the same
 		if utf8.RuneCountInString(message) > 50 {

services/webhook/discord_test.go

@@ -80,12 +80,26 @@ func TestDiscordPayload(t *testing.T) {
 		assert.Equal(t, p.Sender.AvatarURL, pl.Embeds[0].Author.IconURL)
 	})
 
-	t.Run("PushWithLongCommitMessage", func(t *testing.T) {
+	t.Run("PushWithMultilineCommitMessage", func(t *testing.T) {
 		p := pushTestMultilineCommitMessagePayload()
 
 		pl, err := dc.Push(p)
 		require.NoError(t, err)
 
+		assert.Len(t, pl.Embeds, 1)
+		assert.Equal(t, "[test/repo:test] 2 new commits", pl.Embeds[0].Title)
+		assert.Equal(t, "[2020558](http://localhost:3000/test/repo/commit/2020558fe2e34debb818a514715839cabd25e778) chore: This is a commit summary - user1\n[2020558](http://localhost:3000/test/repo/commit/2020558fe2e34debb818a514715839cabd25e778) chore: This is a commit summary - user1", pl.Embeds[0].Description)
+		assert.Equal(t, p.Sender.UserName, pl.Embeds[0].Author.Name)
+		assert.Equal(t, setting.AppURL+p.Sender.UserName, pl.Embeds[0].Author.URL)
+		assert.Equal(t, p.Sender.AvatarURL, pl.Embeds[0].Author.IconURL)
+	})
+
+	t.Run("PushWithLongCommitSummary", func(t *testing.T) {
+		p := pushTestPayloadWithCommitMessage("This is a commit summary ⚠️⚠️⚠️⚠️ containing 你好 ⚠️⚠️️\n\nThis is the message body")
+
+		pl, err := dc.Push(p)
+		require.NoError(t, err)
+
 		assert.Len(t, pl.Embeds, 1)
 		assert.Equal(t, "[test/repo:test] 2 new commits", pl.Embeds[0].Title)
 		assert.Equal(t, "[2020558](http://localhost:3000/test/repo/commit/2020558fe2e34debb818a514715839cabd25e778) This is a commit summary ⚠️⚠️⚠️⚠️ containing 你好... - user1\n[2020558](http://localhost:3000/test/repo/commit/2020558fe2e34debb818a514715839cabd25e778) This is a commit summary ⚠️⚠️⚠️⚠️ containing 你好... - user1", pl.Embeds[0].Description)

services/webhook/general_test.go

@@ -68,7 +68,7 @@ func pushTestPayload() *api.PushPayload {
 }
 
 func pushTestMultilineCommitMessagePayload() *api.PushPayload {
-	return pushTestPayloadWithCommitMessage("This is a commit summary ⚠️⚠️⚠️⚠️ containing 你好 ⚠️⚠️️\n\nThis is the message body.")
+	return pushTestPayloadWithCommitMessage("chore: This is a commit summary\n\nThis is a commit description.")
 }
 
 func pushTestPayloadWithCommitMessage(message string) *api.PushPayload {