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main.go
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main.go
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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"sort"
"strings"
)
type Comic struct {
Transcript string `json:"Transcript"`
Img string `json:"Img"`
}
func main() {
if len(os.Args) != 2 {
fmt.Printf("usage: go run main.go <KEYWORD>\n")
os.Exit(2)
}
keyword := os.Args[1]
num := 1
wd, err := os.Getwd()
if err != nil {
fmt.Printf("get wd failed %s", err.Error())
os.Exit(1)
}
_, err = os.Stat(fmt.Sprintf("%s/indexes", wd))
if err != nil {
if err := os.Mkdir(fmt.Sprintf("%s/indexes", wd), 0777); err != nil {
fmt.Printf("create dir failed %s", err.Error())
os.Exit(1)
}
}
comics := make(map[int]Comic)
fmt.Println("create indexes...")
for {
// TODO 以下をgo routine化したい
// 404は `status code` が404になるので...
for num == 404 {
num++
continue
}
fname := fmt.Sprintf("%s/indexes/%d", wd, num)
_, err := os.Stat(fname)
// すでに取得済みならskip
if err == nil {
buf, err := ioutil.ReadFile(fname)
if err != nil {
fmt.Printf("read file failed %s\n", err.Error())
os.Exit(1)
}
c := Comic{}
if err := json.Unmarshal(buf, &c); err != nil {
fmt.Printf("unmarshal failed %s\n", err.Error())
os.Exit(1)
}
comics[num] = c
num++
continue
}
resp, err := http.Get(fmt.Sprintf("https://xkcd.com/%d/info.0.json", num))
if err != nil {
fmt.Printf("fetch failed %s", err.Error())
os.Exit(1)
}
// 最新刊まで到達したらbreak
if resp.StatusCode == 404 {
break
}
defer resp.Body.Close()
buf, err := ioutil.ReadAll(resp.Body)
if err != nil {
fmt.Printf("read failed %s", err.Error())
os.Exit(1)
}
if err = ioutil.WriteFile(fname, buf, 0644); err != nil {
fmt.Printf("create file failed %s\n", err.Error())
os.Exit(1)
}
c := Comic{}
if err := json.Unmarshal(buf, &c); err != nil {
fmt.Printf("unmarshal failed %s\n", err.Error())
os.Exit(1)
}
comics[num] = c
num++
}
fmt.Println("created indexes")
fmt.Println("search comics...")
fmt.Println()
var keys []int
for k := range comics {
keys = append(keys, k)
}
sort.Ints(keys)
for k := range keys {
c := comics[k]
if strings.Contains(c.Transcript, keyword) {
fmt.Printf("img:\n%s\n\ntranscript:\n%s\n", c.Img, c.Transcript)
os.Exit(0)
}
}
fmt.Println("comic not found")
}