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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 dependant.
package browser
import (
"fmt"
"io"
"io/ioutil"
"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 := ioutil.TempFile("", "browser")
if err != nil {
return fmt.Errorf("browser: could not create temporary file: %v", err)
}
if _, err := io.Copy(f, r); err != nil {
f.Close()
return fmt.Errorf("browser: caching temporary file failed: %v", err)
}
if err := f.Close(); err != nil {
return fmt.Errorf("browser: caching temporary file failed: %v", err)
}
oldname := f.Name()
newname := oldname + ".html"
if err := os.Rename(oldname, newname); err != nil {
return fmt.Errorf("browser: renaming temporary file failed: %v", err)
}
return OpenFile(newname)
}
// OpenURL opens a new browser window pointing to url.
func OpenURL(url string) error {
return openBrowser(url)
}
func runCmd(prog string, args ...string) error {
var cmd *exec.Cmd
browser := envBrowserCmd()
if browser != "" {
sh, flag := shell()
url := args[len(args)-1]
browserCmd := fmtBrowserCmd(browser, url)
cmd = exec.Command(sh, flag, browserCmd)
} else {
cmd = exec.Command(prog, args...)
}
cmd.Stdout = Stdout
cmd.Stderr = Stderr
setFlags(cmd)
return cmd.Run()
}
func envBrowserCmd() string {
return os.Getenv("BROWSER")
}
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