// intermediate representation.
package pgo

import (
	"errors"
	"fmt"
	"internal/profile"
	"io"
	"sort"
)

// FromPProf parses Profile from a pprof profile.
func FromPProf(r io.Reader) (*Profile, error) {
	p, err := profile.Parse(r)
	if errors.Is(err, profile.ErrNoData) {
		// Treat a completely empty file the same as a profile with no
		// samples: nothing to do.

	f, err := os.Open(profileFile)
	if err != nil {
		return fmt.Errorf("error opening profile: %w", err)
	}
	defer f.Close()

	r := bufio.NewReader(f)
	d, err := pgo.FromPProf(r)
	if err != nil {
		return fmt.Errorf("error parsing profile: %w", err)
	}

	var out *os.File
	if outputFile == "" {
		out = os.Stdout
	} else {
		out, err = os.Create(outputFile)
		if err != nil {