Method readFile

cmd/errtrace/main.go:640–665

(r fileRequest)

}

func (cmd *mainCmd) readFile(r fileRequest) ([]byte, error) {
	if r.Filepath != "-" {
		return errtrace.Wrap2(os.ReadFile(r.Filename))
	}

	if r.Write {
		return nil, errtrace.Wrap(fmt.Errorf("can't use -w with stdin"))
	}

	if r.ImplicitStdin {
		// Running with no args reads from stdin, but this is not obvious
		// so print a usage hint to stderr, if we think stdin is a TTY.
		// Best-effort check for a TTY by looking for a character device.
		type statter interface {
			Stat() (os.FileInfo, error)
		}
		if st, ok := cmd.Stdin.(statter); ok {
			if fi, err := st.Stat(); err == nil &&
				fi.Mode()&os.ModeCharDevice == os.ModeCharDevice {
				cmd.log.Println("reading from stdin; use '-h' for help")
			}
		}
	}

	return errtrace.Wrap2(io.ReadAll(cmd.Stdin))
}

type walker struct {
	// Inputs