Method ExecForEach

script.go:465–505

ExecForEach renders cmdLine as a Go template for each line of input, running the resulting command, and produces the combined output of all these commands in sequence. See [Pipe.Exec] for details on error handling and environment variables. This is mostly useful for substituting data into commands

(cmdLine string)

//
//	ListFiles("*").ExecForEach("touch {{.}}").Wait()
func (p *Pipe) ExecForEach(cmdLine string) *Pipe {
	tpl, err := template.New("").Parse(cmdLine)
	if err != nil {
		return p.WithError(err)
	}
	return p.Filter(func(r io.Reader, w io.Writer) error {
		scanner := newScanner(r)
		for scanner.Scan() {
			cmdLine := new(strings.Builder)
			err := tpl.Execute(cmdLine, scanner.Text())
			if err != nil {
				return err
			}
			args, err := shell.Fields(cmdLine.String(), nil)
			if err != nil {
				return err
			}
			cmd := exec.Command(args[0], args[1:]...)
			cmd.Stdout = w
			cmd.Stderr = w
			pipeStderr := p.stdErr()
			if pipeStderr != nil {
				cmd.Stderr = pipeStderr
			}
			if p.env != nil {
				cmd.Env = p.env
			}
			err = cmd.Start()
			if err != nil {
				fmt.Fprintln(cmd.Stderr, err)
				continue
			}
			err = cmd.Wait()
			if err != nil {
				fmt.Fprintln(cmd.Stderr, err)
				continue
			}
		}
		return scanner.Err()
	})
}

var exitStatusPattern = regexp.MustCompile(`exit status (\d+)$`)