ui.options.UI.PrintErr(err)
		return nil, nil
	}
	if configEditor != nil {
		configEditor(&cfg)
	}
	catcher := &errorCatcher{UI: ui.options.UI}
	options := *ui.options
	options.UI = catcher
	_, rpt, err := generateRawReport(ui.copier.newCopy(), cmd, cfg, &options)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		ui.options.UI.PrintErr(err)
		return nil, nil

func greetings(p *profile.Profile, ui plugin.UI) {
	numLabelUnits := identifyNumLabelUnits(p, ui)
	ropt, err := reportOptions(p, numLabelUnits, currentConfig())
	if err == nil {
		rpt := report.New(p, ropt)
		ui.Print(strings.Join(report.ProfileLabels(rpt), "\n"))
		if rpt.Total() == 0 && len(p.SampleType) > 1 {
			ui.Print(`No samples were found with the default sample value type.`)

				o.UI.PrintErr("Saved profile in ", tempFile.Name())
			}
		}
		if err != nil {
			o.UI.PrintErr("Could not save profile: ", err)
		}
	}

	if err := p.CheckValid(); err != nil {
		return nil, err
	}

	return p, nil
}

		http.Error(w, "error serializing stacks for flame graph",
			http.StatusInternalServerError)
		ui.options.UI.PrintErr(err)
		return
	}

	nodes := make([]string, len(stacks.Sources))
	for i, src := range stacks.Sources {
		nodes[i] = src.FullName
	}
	nodes[0] = "" // root is not a real node

	_, legend := report.TextItems(rpt)
	ui.render(w, req, "stacks", rpt, errList, legend, webArgs{
		Stacks:   template.JS(b),

			case "default":
				continue
			}
			s.UI.PrintErr("ignoring unrecognized symbolization option: " + mode)
			s.UI.PrintErr("expecting -symbolize=[local|fastlocal|remote|none][:force][:demangle=[none|full|templates|default]")
		}
	}

	var err error
	if local {
		// Symbolize locally using binutils.
		if err = localSymbolize(p, fast, force, s.Obj, s.UI); err != nil {
			s.UI.PrintErr("local symbolization: " + err.Error())
		}
	}

func generateTagRootsLeaves(prof *profile.Profile, cfg config, ui plugin.UI) {
	tagRootLabelKeys := dropEmptyStrings(strings.Split(cfg.TagRoot, ","))
	tagLeafLabelKeys := dropEmptyStrings(strings.Split(cfg.TagLeaf, ","))
	rootm, leafm := addLabelNodes(prof, tagRootLabelKeys, tagLeafLabelKeys, cfg.Unit)
	warnNoMatches(cfg.TagRoot == "" || rootm, "TagRoot", ui)
	warnNoMatches(cfg.TagLeaf == "" || leafm, "TagLeaf", ui)
}

	si = sampleIndex(flagTotalDelay, si, "delay", "-total_delay", o.UI)
	si = sampleIndex(flagMeanDelay, si, "delay", "-mean_delay", o.UI)
	si = sampleIndex(flagContentions, si, "contentions", "-contentions", o.UI)
	si = sampleIndex(flagInUseSpace, si, "inuse_space", "-inuse_space", o.UI)
	si = sampleIndex(flagInUseObjects, si, "inuse_objects", "-inuse_objects", o.UI)
	si = sampleIndex(flagAllocSpace, si, "alloc_space", "-alloc_space", o.UI)

}

// A UI manages user interactions.
type UI interface {
	// ReadLine returns a line of text (a command) read from the user.
	// prompt is printed before reading the command.
	ReadLine(prompt string) (string, error)

	// Print shows a message to the user.
	// It formats the text as fmt.Print would and adds a final \n if not already present.
	// For line-based UI, Print writes to standard error.

// the screen.
func awayFromTTY(format string) PostProcessor {
	return func(input io.Reader, output io.Writer, ui plugin.UI) error {
		if output == os.Stdout && (ui.IsTerminal() || interactiveMode) {
			tempFile, err := newTempFile("", "profile", "."+format)
			if err != nil {
				return err
			}
			ui.PrintErr("Generating report in ", tempFile.Name())
			output = tempFile
		}
		_, err := io.Copy(output, input)

func init() {
	newUI = newReadlineUI
}

// readlineUI implements driver.UI interface using the
// golang.org/x/term package.
// The upstream pprof command implements the same functionality
// using the github.com/chzyer/readline package.
type readlineUI struct {
	term *term.Terminal
}

func newReadlineUI() driver.UI {
	// disable readline UI in dumb terminal. (golang.org/issue/26254)