You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: stat.go
    path of file: ./repos/fabio/vendor/github.com/prometheus/procfs
    
    the code of the file until where you have to start completion: // Copyright 2018 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package procfs

import (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"strconv"
	"strings"

	"github.com/prometheus/procfs/internal/fs"
	"github.com/prometheus/procfs/internal/util"
)

// CPUStat shows how much time the cpu spend in various stages.
type CPUStat struct {
	User      float64
	Nice      float64
	System    float64
	Idle      float64
	Iowait    float64
	IRQ       float64
	SoftIRQ   float64
	Steal     float64
	Guest     float64
	GuestNice float64
}

// SoftIRQStat represent the softirq statistics as exported in the procfs stat file.
// A nice introduction can be found at https://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-9.html
// It is possible to get per-cpu stats by reading /proc/softirqs
type SoftIRQStat struct {
	Hi          uint64
	Timer 
    
func (fs FS) Stat() (Stat, error) {
	fileName := fs.proc.Path("stat")
	data, err := util.ReadFileNoStat(fileName)
	if err != nil {
		return Stat{}, err
	}

	stat := Stat{}

	scanner := bufio.NewScanner(bytes.NewReader(data))
	for scanner.Scan() {
		line := scanner.Text()
		parts := strings.Fields(scanner.Text())
		// require at least <key> <value>
		if len(parts) < 2 {
			continue
		}
		switch {
		case parts[0] == "btime":
			if stat.BootTime, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
				return Stat{}, fmt.Errorf("couldn't parse %s (btime): %s", parts[1], err)
			}
		case parts[0] == "intr":
			if stat.IRQTotal, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
				return Stat{}, fmt.Errorf("couldn't parse %s (intr): %s", parts[1], err)
			}
			numberedIRQs := parts[2:]
			stat.IRQ = make([]uint64, len(numberedIRQs))
			for i, count := range numberedIRQs {
				if stat.IRQ[i], err = strconv.ParseUint(count, 10, 64); err != nil {
					return Stat{}, fmt.Errorf("couldn't parse %s (intr%d): %s", count, i, err)
				}
			}
		case parts[0] == "ctxt":
			if stat.ContextSwitches, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
				return Stat{}, fmt.Errorf("couldn't parse %s (ctxt): %s", parts[1], err)
			}
		case parts[0] == "processes":
			if stat.ProcessCreated, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
				return Stat{}, fmt.Errorf("couldn't parse %s (processes): %s", parts[1], err)
			}
		case parts[0] == "procs_running":
			if stat.ProcessesRunning, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
				return Stat{}, fmt.Errorf("couldn't parse %s (procs_running): %s", parts[1], err)
			}
		case parts[0] == "procs_blocked":
			if stat.ProcessesBlocked, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
				return Stat{}, fmt.Errorf("couldn't parse %s (procs_blocked): %s", parts[1], err)
			}
		case parts[0] == "softirq":
			softIRQStats, total, err := parseSoftIRQStat(line)
			if err != nil {
				return Stat{}, err
			}
			stat.SoftIRQTotal = total
			stat.SoftIRQ = softIRQStats
		case strings.HasPrefix(parts[0], "cpu"):
			cpuStat, cpuID, err := parseCPUStat(line)
			if err != nil {
				return Stat{}, err
			}
			if cpuID == -1 {
				stat.CPUTotal = cpuStat
			} else {
				for int64(len(stat.CPU)) <= cpuID {
					stat.CPU = append(stat.CPU, CPUStat{})
				}
				stat.CPU[cpuID] = cpuStat
			}
		}
	}

	if err := scanner.Err(); err != nil {
		return Stat{}, fmt.Errorf("couldn't parse %s: %s", fileName, err)
	}

	return stat, nil
}