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browser.go

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// Package browser provides helpers to open files, readers, and urls in a browser window.

//

// The choice of which browser is started is entirely client dependent.

package browser

import (

"fmt"

"io"

"os"

"os/exec"

"path/filepath"

)

// Stdout is the io.Writer to which executed commands write standard output.

var Stdout io.Writer = os.Stdout

// Stderr is the io.Writer to which executed commands write standard error.

var Stderr io.Writer = os.Stderr

// OpenFile opens new browser window for the file path.

func OpenFile(path string) error {

path, err := filepath.Abs(path)

if err != nil {

return err

}

return OpenURL("file://" + path)

}

// OpenReader consumes the contents of r and presents the

// results in a new browser window.

func OpenReader(r io.Reader) error {

f, err := os.CreateTemp("", "browser.*.html")

if err != nil {

return fmt.Errorf("browser: could not create temporary file: %w", err)

}

if _, err := io.Copy(f, r); err != nil {

f.Close()

return fmt.Errorf("browser: caching temporary file failed: %w", err)

}

if err := f.Close(); err != nil {

return fmt.Errorf("browser: caching temporary file failed: %w", err)

}

return OpenFile(f.Name())

}

// OpenURL opens a new browser window pointing to url.

func OpenURL(url string) error {

return openBrowser(url)

}

func runCmd(prog string, args ...string) error {

cmd := exec.Command(prog, args...)

cmd.Stdout = Stdout

cmd.Stderr = Stderr

return cmd.Run()

}