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25
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1 package main
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2
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3 import (
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4 "fmt"
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5 "flag"
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6 "log"
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7 "net/http"
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8 "os"
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9 "strconv"
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10 "time"
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11
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12 "golang.org/x/net/html"
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13 )
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14
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15 func main() {
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16
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17 var thro, thru float64
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18 var help bool
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19
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20 flag.Float64Var( &thro, "o", 999.9, "over" )
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21 flag.Float64Var( &thru, "u", 0.0, "under" )
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22 flag.BoolVar( &help, "h", false, "print help" )
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23 flag.Parse()
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24
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25 if help {
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26 PrintHelp()
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27 os.Exit( 0 )
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28 }
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29 if thro < thru {
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30 fmt.Println( "bad rate." )
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31 os.Exit( 0 )
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32 }
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33
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34 url := "http://finance.yahoo.co.jp/"
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35 fmt.Printf( "> get rate from '%s' ...\n", url )
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36 usd, err := GetUSD( time.Now(), url )
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37 if err != nil {
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38 log.Fatal( err )
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39 }
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40 if ( thro == 999.9 && thru == 0.0 ) ||
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41 ( thro < usd && thru == 0.0 ) ||
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42 ( thru > usd && thro == 999.9 ) ||
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43 ( thru > usd && thro < usd ) {
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44 os.Exit( 0 )
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45 }
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46
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47 c := time.Tick( 30 * time.Second )
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48 for now := range c {
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49 usd, _ := GetUSD( now, url )
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50 if thro < usd || thru > usd {
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51 os.Exit( 0 )
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52 }
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53 }
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54 }
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55
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56 func GetUSD( now time.Time, url string ) ( float64, error ) {
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57
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58 resp, err := http.Get( url )
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59 if err != nil {
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60 return 0, err
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61 }
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62
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63 z := html.NewTokenizer( resp.Body )
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64 usd, _ := ParseHtml( z )
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65 defer resp.Body.Close()
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66 fmt.Println( fmt.Sprintf( "%s [ %.3f ]", now.Format( "15:04:05" ), usd ) )
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67
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68 return usd, nil
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69 }
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70
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71 func ParseHtml( z *html.Tokenizer ) ( float64, error ) {
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72 for {
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73 tt := z.Next()
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74 switch tt {
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75 case html.ErrorToken:
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76 return 0.0, nil
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77
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78 case html.StartTagToken:
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79 tag, _ := z.TagName()
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80 key, val, _ := z.TagAttr()
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81 if string( tag ) == "strong" && string( key ) == "class" && string( val ) == "bkLine" {
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82 z.Next()
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83 //fmt.Printf( "%s %s %s\n", key, val, z.Token() )
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84 return strconv.ParseFloat( z.Token().String(), 32 )
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85 }
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86 }
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87 }
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88 }
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89
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90 func PrintHelp() {
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91 fmt.Fprint( os.Stderr, "Usage:\n" )
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92 fmt.Fprint( os.Stderr, "> checkusd # print rate.\n" )
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93 fmt.Fprint( os.Stderr, "> checkusd -o 112.987 # continue printing rate and stop when rate over.\n" )
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94 fmt.Fprint( os.Stderr, "> checkusd -u 112.987 # continue printing rate and stop when rate under.\n" )
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95 fmt.Fprint( os.Stderr, "> checkusd -o 112.987 -u 112.789 # both.\n" )
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96 fmt.Fprint( os.Stderr, "> checkusd -h # print this help\n" )
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97 }
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98
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