channel.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"strings"
)

type Data struct {
	Ok       bool      `json:"ok"`
	Channels []Channel `json:"channels"`
}

type Channel struct {
	ID             string   `json:"id"`
	Name           string   `json:"name"`
	IsChannel      bool     `json:"is_channel"`
	Created        int32    `json:"created"`
	IsArchived     bool     `json:"is_archived"`
	IsGeneral      bool     `json:"is_general"`
	Unlinked       int32    `json:"unlinked"`
	Creator        string   `json:"creator"`
	NameNormalized string   `json:"name_normalized"`
	IsShared       bool     `json:"is_shared"`
	IsOrgShared    bool     `json:"is_org_shared"`
	IsMember       bool     `json:"is_member"`
	IsPrivate      bool     `json:"is_private"`
	IsMpim         bool     `json:"is_mpim"`
	Members        []string `json:"members"`
	Topic          Topic    `json:"topic"`
	Purpose        Purpose  `json:"purpose"`
	PreviousNames  []string `json:"previous_names"`
	NumMembers     int32    `json:"num_members"`
}

type Topic struct {
	Value   string `json:"value"`
	Creator string `json:"creator"`
	LastSet int32  `json:"last_set"`
}

type Purpose struct {
	Value   string `json:"value"`
	Creator string `json:"creator"`
	LastSet int32  `json:"last_set"`
}

func main() {
  url := "https://slack.com/api/channels.list?token={YOUR_TOKEN}&exclude_archived=true&pretty=1"
	resp, err := http.Get(url)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()

	bytes, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatal(err)
	}

	var data Data
	json.Unmarshal(bytes, &data)

	c1 := []string{}
	c2 := []string{}

	for _, c := range data.Channels {
		if c.IsPrivate || c.IsArchived {
			continue
		}
		if strings.Index(c.Name, "time") < 0 {
			c1 = append(c1, c.Name)
			continue
		}

		c2 = append(c2, c.Name)
	}

	fmt.Println("=== Times Channels ======")
	for _, n := range c2 {
		fmt.Printf("#%s\n", n)
	}

	fmt.Println("")
	fmt.Println("=== Public Channels ======")
	for _, n := range c1 {
		fmt.Printf("#%s\n", n)
	}
}