init bot

.gitignore

@@ -0,0 +1,29 @@
+# ---> Go
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+# Goland
+.idea
+bin
+
+# bot
+token.txt

commands/command.go

@@ -0,0 +1,9 @@
+package commands
+
+type Command string
+
+const (
+	Start = Command("/start")
+	Help  = Command("/help")
+	Ping  = Command("/ping")
+)

go.mod

@@ -1,3 +1,10 @@
 module valera
 
 go 1.17
+
+require (
+	github.com/go-telegram-bot-api/telegram-bot-api v4.6.4+incompatible
+	github.com/umputun/go-flags v1.5.1
+)
+
+require github.com/technoweenie/multipartstreamer v1.0.1 // indirect

go.sum

@@ -0,0 +1,6 @@
+github.com/go-telegram-bot-api/telegram-bot-api v4.6.4+incompatible h1:2cauKuaELYAEARXRkq2LrJ0yDDv1rW7+wrTEdVL3uaU=
+github.com/go-telegram-bot-api/telegram-bot-api v4.6.4+incompatible/go.mod h1:qf9acutJ8cwBUhm1bqgz6Bei9/C/c93FPDljKWwsOgM=
+github.com/technoweenie/multipartstreamer v1.0.1 h1:XRztA5MXiR1TIRHxH2uNxXxaIkKQDeX7m2XsSOlQEnM=
+github.com/technoweenie/multipartstreamer v1.0.1/go.mod h1:jNVxdtShOxzAsukZwTSw6MDx5eUJoiEBsSvzDU9uzog=
+github.com/umputun/go-flags v1.5.1 h1:vRauoXV3Ultt1HrxivSxowbintgZLJE+EcBy5ta3/mY=
+github.com/umputun/go-flags v1.5.1/go.mod h1:nTbvsO/hKqe7Utri/NoyN18GR3+EWf+9RrmsdwdhrEc=

main.go

@@ -1,11 +1,93 @@
 package main
 
-import "fmt"
+import (
+	"errors"
+	"fmt"
+	tgbot "github.com/go-telegram-bot-api/telegram-bot-api"
+	"github.com/umputun/go-flags"
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+	"valera/commands"
+)
 
 const (
 	version = "v0.1.1"
 )
 
-func main() {
-  fmt.Println("Hello, Go!")
+type Opts struct {
+	Token string `short:"t" long:"token" description:"Telegram api token"`
+	Name  string `short:"n" long:"name" description:"Telegram bot name" default:"@body_weight_loss_bot"`
+}
+
+var opts Opts
+
+func readToken() (string, error) {
+	b, err := ioutil.ReadFile("token.txt")
+	if err != nil {
+		return "", err
+	}
+	str := string(b)
+	return str, nil
+}
+
+func main() {
+	run()
+}
+
+func run() {
+	p := flags.NewParser(&opts, flags.PrintErrors|flags.PassDoubleDash|flags.HelpFlag)
+	p.SubcommandsOptional = true
+	if _, err := p.Parse(); err != nil {
+		if err.(*flags.Error).Type != flags.ErrHelp {
+			log.Println(errors.New("[ERROR] cli error: " + err.Error()))
+		}
+		os.Exit(2)
+	}
+
+	if opts.Token == "" {
+		token, err := readToken()
+		if err != nil {
+			panic(err)
+		}
+		opts.Token = strings.ReplaceAll(token, "\n", "")
+	}
+	fmt.Println(opts.Token)
+
+	bot, err := tgbot.NewBotAPI(opts.Token)
+	if err != nil {
+		panic(err)
+	}
+
+	u := tgbot.NewUpdate(0)
+	u.Timeout = 60
+
+	updates, err := bot.GetUpdatesChan(u)
+	if err != nil {
+		panic(err)
+	}
+
+	log.Println("Run", opts.Name)
+
+	for update := range updates {
+
+		if update.Message == nil {
+			continue
+		}
+
+		text := update.Message.Text
+		chatID := update.Message.Chat.ID
+//		username := update.Message.From.UserName
+
+		command := commands.Command(strings.Replace(text, opts.Name, "", 1))
+		switch command {
+		case commands.Start:
+			_, _ = bot.Send(tgbot.NewMessage(chatID, fmt.Sprintf("Здорова, я Валера (%s), твой тренер (%d).", version, chatID)))
+		case commands.Help:
+			_, _ = bot.Send(tgbot.NewMessage(chatID, "Вот что я умею:\n\n1) Ничего"))
+		case commands.Ping:
+			_, _ = bot.Send(tgbot.NewMessage(chatID, "pong"))
+		}
+	}
 }