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main.go
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main.go
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package main
import (
"flag"
"fmt"
"io"
"net/http"
"net/url"
"os"
"strings"
"github.com/cheggaaa/pb"
"time"
)
/*
usage = usage text
version = current number
help use Sprintf
about (me :))
*cliUrl from cmd
*cliVersion from cmd
*cliHelp from cmd
*cliAbout from cmd
*/
var (
usage = "Usage: ./gofret -url=http://some/do.zip"
version = "Version: 0.1"
about = "Coded by Ali GOREN, aligoren.com"
help = fmt.Sprintf("\n\n %s\n\n\n %s\n\n\n %s", usage, version, about)
cliUrl *string
cliVersion *bool
cliHelp *bool
cliAbout *bool
)
func init() {
/*
if *cliUrl != "" {
fmt.Println(*cliUrl)
}
./gofret -url=http://somesite.com/somefile.zip
./gofret -url=https://github.com/aligoren/syspy/archive/master.zip
*/
cliUrl = flag.String("url", "", usage)
/*
else if *cliVersion{
fmt.Println(flag.Lookup("version").Usage)
}
./gofret -version
*/
cliVersion = flag.Bool("version", false, version)
/*
if *cliHelp {
fmt.Println(flag.Lookup("help").Usage)
}
./gofret -help
*/
cliHelp = flag.Bool("help", false, help)
/*
if *cliAbout {
fmt.Println(flag.Lookup("about").Usage)
}
*/
cliAbout = flag.Bool("about", false, about)
}
func main() {
/*
Parse all flags
*/
flag.Parse()
if *cliUrl != "" {
fmt.Println("\nDownloading file...\n")
/* parse url from *cliUrl */
fileUrl, err := url.Parse(*cliUrl)
if err != nil {
panic(err)
}
/* get path from *cliUrl */
filePath := fileUrl.Path
/*
seperate file.
http://+site.com/+(file.zip)
*/
segments := strings.Split(filePath, "/")
/*
file.zip filename lenth -1
*/
fileName := segments[len(segments)-1]
/*
Create new file.
Filename from fileName variable
*/
file, err := os.Create(fileName)
if err != nil {
fmt.Println(err)
panic(err)
}
defer file.Close()
/*
check status and CheckRedirect
*/
checkStatus := http.Client{
CheckRedirect: func(r *http.Request, via []*http.Request) error {
r.URL.Opaque = r.URL.Path
return nil
},
}
/*
Get Response: 200 OK?
*/
response, err := checkStatus.Get(*cliUrl)
if err != nil {
fmt.Println(err)
panic(err)
}
defer response.Body.Close()
fmt.Printf("Request Status: %s\n\n", response.Status) // Example: 200 OK
/*
filesize example: 12572 bytes
*/
filesize := response.ContentLength
/*
go func == goroutines
more on my topic: http://stackoverflow.com/a/30534837/3821823
*/
go func() {
n, err := io.Copy(file, response.Body)
if n != filesize {
fmt.Println("Truncated")
}
if err != nil {
fmt.Printf("Error: %v", err)
}
}()
/*
countSize == fileSize := 20000 / 1000
=> 20
*/
countSize := int(filesize / 1000)
bar := pb.StartNew(countSize) // start new progressbar
var fi os.FileInfo // get file information from os
for fi == nil || fi.Size() < filesize { // for like while
fi, _ = file.Stat() // File status
bar.Set(int(fi.Size() / 1000)) // File size / 1000
time.Sleep(time.Millisecond) // wait millisecond
}
finishMessage := fmt.Sprintf("\n%s with %v bytes downloaded",
fileName, filesize)
bar.FinishPrint(finishMessage) // finished messages
if err != nil {
panic(err)
}
} else if *cliVersion {
/*
lookup version flag's usage text
*/
fmt.Println(flag.Lookup("version").Usage)
} else if *cliHelp {
/*
lookup help flag's usage text
*/
fmt.Println(flag.Lookup("help").Usage)
} else if *cliAbout{
/*
lookup about flag's usage text
*/
fmt.Println("\n\n"+flag.Lookup("about").Usage)
} else {
/*
using help's usage text for handling other status
*/
fmt.Println(flag.Lookup("help").Usage)
}
}