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