treat message by pointer

scripts/lib/generator.go

@@ -122,14 +122,9 @@ func (g *HTMLGenerator) generateChannelDir(path string, channel Channel) (bool,
 		return false, fmt.Errorf("could not create %s directory: %w", path, err)
 	}
 
-	keys := make([]MessageMonthKey, 0, len(msgsMap))
-	for key := range msgsMap {
-		keys = append(keys, key)
-	}
-
 	if err := g.generateChannelIndex(
 		channel,
-		keys,
+		msgsMap.Keys(),
 		filepath.Join(path, "index.html"),
 	); err != nil {
 		return true, err
@@ -178,7 +173,7 @@ func (g *HTMLGenerator) generateChannelIndex(channel Channel, keys []MessageMont
 	return nil
 }
 
-func (g *HTMLGenerator) generateMessageDir(channel Channel, key MessageMonthKey, msgs []Message, path string) error {
+func (g *HTMLGenerator) generateMessageDir(channel Channel, key MessageMonthKey, msgs Messages, path string) error {
 	if err := os.MkdirAll(path, 0777); err != nil {
 		return fmt.Errorf("could not create %s directory: %w", path, err)
 	}
@@ -233,7 +228,7 @@ func (g *HTMLGenerator) generateMessageDir(channel Channel, key MessageMonthKey,
 				}
 				return ""
 			},
-			"threads": func(ts string) []Message {
+			"threads": func(ts string) Messages {
 				if t, ok := g.s.GetThread(channel.ID, ts); ok {
 					return t.Replies()
 				}

scripts/lib/message.go

@@ -11,6 +11,29 @@ import (
 	"strings"
 )
 
+// Messages is an array of `*Message`.
+type Messages []*Message
+
+// Sort sorts messages by `Message.Ts` ascendant order.
+func (msgs Messages) Sort() {
+	sort.SliceStable(msgs, func(i, j int) bool {
+		// must be the same digits, so no need to convert the timestamp to a number
+		return msgs[i].Ts < msgs[j].Ts
+	})
+}
+
+// MessagesMap is a map, maps MessageMonthKey to Messages.
+type MessagesMap map[MessageMonthKey]Messages
+
+// Keys returns all keys in the map.
+func (mm MessagesMap) Keys() []MessageMonthKey {
+	keys := make([]MessageMonthKey, 0, len(mm))
+	for key := range mm {
+		keys = append(keys, key)
+	}
+	return keys
+}
+
 // MessageTable : メッセージデータを保持する
 // スレッドは投稿時刻からどのスレッドへの返信かが判断できるためThreadMapのキー
 // はtsである。
@@ -20,7 +43,7 @@ import (
 type MessageTable struct {
 	// key: thread timestamp
 	ThreadMap map[string]*Thread
-	MsgsMap   map[MessageMonthKey][]Message
+	MsgsMap   MessagesMap
 	// key: file path
 	loadedFiles map[string]struct{}
 }
@@ -32,7 +55,7 @@ type MessageTable struct {
 func NewMessageTable() *MessageTable {
 	return &MessageTable{
 		ThreadMap:   map[string]*Thread{},
-		MsgsMap:     map[MessageMonthKey][]Message{},
+		MsgsMap:     MessagesMap{},
 		loadedFiles: map[string]struct{}{},
 	}
 }
@@ -79,13 +102,15 @@ func (m *MessageTable) ReadLogFile(path string) error {
 		return nil
 	}
 
-	var msgs []Message
-	var visibleMsgs []Message
+	var msgs Messages
 	err = ReadFileAsJSON(path, &msgs)
 	if err != nil {
 		return fmt.Errorf("failed to unmarshal %s: %w", path, err)
 	}
-	for i, msg := range msgs {
+
+	// assort messages, visible and threaded.
+	var visibleMsgs Messages
+	for _, msg := range msgs {
 		if !msg.IsVisible() {
 			continue
 		}
@@ -97,18 +122,12 @@ func (m *MessageTable) ReadLogFile(path string) error {
 			visibleMsgs = append(visibleMsgs, msg)
 		}
 		if threadTs != "" {
-			if m.ThreadMap[threadTs] == nil {
-				m.ThreadMap[threadTs] = &Thread{}
-			}
-			if msg.IsRootOfThread() {
-				m.ThreadMap[threadTs].rootMsg = &msgs[i]
-			} else {
-				if m.ThreadMap[threadTs].replies == nil {
-					m.ThreadMap[threadTs].replies = []Message{msg}
-				} else {
-					m.ThreadMap[threadTs].replies = append(m.ThreadMap[threadTs].replies, msg)
-				}
+			thread, ok := m.ThreadMap[threadTs]
+			if !ok {
+				thread = &Thread{}
+				m.ThreadMap[threadTs] = thread
 			}
+			thread.Put(msg)
 		}
 	}
 
@@ -117,22 +136,15 @@ func (m *MessageTable) ReadLogFile(path string) error {
 		return err
 	}
 	if len(visibleMsgs) != 0 {
-		if _, ok := m.MsgsMap[key]; !ok {
-			m.MsgsMap[key] = visibleMsgs
-		} else {
-			m.MsgsMap[key] = append(m.MsgsMap[key], visibleMsgs...)
-		}
+		m.MsgsMap[key] = append(m.MsgsMap[key], visibleMsgs...)
 	}
 
-	for key, msgs := range m.MsgsMap {
-		sort.SliceStable(m.MsgsMap[key], func(i, j int) bool {
-			// must be the same digits, so no need to convert the timestamp to a number
-			return m.MsgsMap[key][i].Ts < m.MsgsMap[key][j].Ts
-		})
+	for _, msgs := range m.MsgsMap {
+		msgs.Sort()
 		var lastUser string
-		for i, msg := range msgs {
+		for _, msg := range msgs {
 			if lastUser == msg.User {
-				(&msgs[i]).Trail = true
+				msg.Trail = true
 			} else {
 				lastUser = msg.User
 			}

scripts/lib/store.go

@@ -73,7 +73,7 @@ func (s *LogStore) HasPrevMonth(channelID string, key MessageMonthKey) bool {
 	return false
 }
 
-func (s *LogStore) GetMessagesPerMonth(channelID string) (map[MessageMonthKey][]Message, error) {
+func (s *LogStore) GetMessagesPerMonth(channelID string) (MessagesMap, error) {
 	mt, ok := s.mts[channelID]
 	if !ok {
 		return nil, fmt.Errorf("not found channel: id=%s", channelID)

scripts/lib/thread.go

@@ -9,21 +9,30 @@ import (
 // repliesにはそのスレッドへの返信メッセージが入る。先頭メッセージは含まない。
 type Thread struct {
 	rootMsg *Message
-	replies []Message
+	replies Messages
 }
 
-func (t Thread) LastReplyTime() time.Time {
-	return TsToDateTime(t.replies[len(t.replies)-1].Ts)
+func (th Thread) LastReplyTime() time.Time {
+	return TsToDateTime(th.replies[len(th.replies)-1].Ts)
 }
 
-func (t Thread) ReplyCount() int {
-	return len(t.replies)
+func (th Thread) ReplyCount() int {
+	return len(th.replies)
 }
 
-func (t Thread) RootText() string {
-	return t.rootMsg.Text
+func (th Thread) RootText() string {
+	return th.rootMsg.Text
 }
 
-func (t Thread) Replies() []Message {
-	return t.replies
+func (th Thread) Replies() Messages {
+	return th.replies
+}
+
+// Put puts a message to the thread as "root" or "reply".
+func (th *Thread) Put(m *Message) {
+	if m.IsRootOfThread() {
+		th.rootMsg = m
+	} else {
+		th.replies = append(th.replies, m)
+	}
 }