add telegram bot

internal/config/config.go

@@ -3,10 +3,13 @@ package config
 import (
 	"fmt"
 	"os"
+	"regexp"
 
 	"github.com/BurntSushi/toml"
 )
 
+var timeFormatRe = regexp.MustCompile(`^\d{2}:\d{2}$`)
+
 type Config struct {
 	Memos    MemosConfig    `toml:"memos"`
 	Database DatabaseConfig `toml:"database"`
@@ -119,6 +122,9 @@ func setDefaults(cfg *Config) {
 	if cfg.General.LogLevel == "" {
 		cfg.General.LogLevel = "info"
 	}
+	if cfg.Telegram.SendAt == "" {
+		cfg.Telegram.SendAt = "09:00"
+	}
 }
 
 func validate(cfg *Config) error {
@@ -131,5 +137,13 @@ func validate(cfg *Config) error {
 	if sum := cfg.Search.TierWeights.Sum(); sum != 100 {
 		return fmt.Errorf("search.tier_weights must sum to 100, got %d", sum)
 	}
+	if cfg.Telegram.Token != "" {
+		if cfg.Telegram.ChatID == 0 {
+			return fmt.Errorf("telegram.chat_id is required when telegram.token is set")
+		}
+		if !timeFormatRe.MatchString(cfg.Telegram.SendAt) {
+			return fmt.Errorf("telegram.send_at must be in HH:MM format, got %q", cfg.Telegram.SendAt)
+		}
+	}
 	return nil
 }