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package main
import (
"flag"
"fmt"
"io"
"log"
"net/http"
"os"
"path/filepath"
"github.com/charmbracelet/bubbles/progress"
tea "github.com/charmbracelet/bubbletea"
)
var p *tea.Program
type progressWriter struct {
total int
downloaded int
file *os.File
reader io.Reader
onProgress func(float64)
}
func (pw *progressWriter) Start() {
// TeeReader calls pw.Write() each time a new response is received
_, err := io.Copy(pw.file, io.TeeReader(pw.reader, pw))
if err != nil {
p.Send(progressErrMsg{err})
}
}
func (pw *progressWriter) Write(p []byte) (int, error) {
pw.downloaded += len(p)
if pw.total > 0 && pw.onProgress != nil {
pw.onProgress(float64(pw.downloaded) / float64(pw.total))
}
return len(p), nil
}
func getResponse(url string) (*http.Response, error) {
resp, err := http.Get(url) // nolint:gosec
if err != nil {
log.Fatal(err)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("receiving status of %d for url: %s", resp.StatusCode, url)
}
return resp, nil
}
func main() {
url := flag.String("url", "", "url for the file to download")
flag.Parse()
if *url == "" {
flag.Usage()
os.Exit(1)
}
resp, err := getResponse(*url)
if err != nil {
fmt.Println("could not get response", err)
os.Exit(1)
}
defer resp.Body.Close() // nolint:errcheck
// Don't add TUI if the header doesn't include content size
// it's impossible see progress without total
if resp.ContentLength <= 0 {
fmt.Println("can't parse content length, aborting download")
os.Exit(1)
}
filename := filepath.Base(*url)
file, err := os.Create(filename)
if err != nil {
fmt.Println("could not create file:", err)
os.Exit(1)
}
defer file.Close() // nolint:errcheck
pw := &progressWriter{
total: int(resp.ContentLength),
file: file,
reader: resp.Body,
onProgress: func(ratio float64) {
p.Send(progressMsg(ratio))
},
}
m := model{
pw: pw,
progress: progress.New(progress.WithDefaultGradient()),
}
// Start Bubble Tea
p = tea.NewProgram(m)
// Start the download
go pw.Start()
if _, err := p.Run(); err != nil {
fmt.Println("error running program:", err)
os.Exit(1)
}
}
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