tests/regres/cmd/export_to_sheets/main.go - SwiftShader - Git at Google

 // Copyright 2019 The SwiftShader Authors. All Rights Reserved.
 //
 // 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.

 // export_to_sheets updates a Google sheets document with the latest test
 // results
 package main

 import (
 	"bufio"
 	"bytes"
 	"context"
 	"encoding/json"
 	"flag"
 	"fmt"
 	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
 	"path/filepath"
 	"strings"

 	"../../cause"
 	"../../consts"
 	"../../git"
 	"../../testlist"

 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 	"google.golang.org/api/sheets/v4"
 )

 var (
 	authdir       = flag.String("authdir", "~/.regres-auth", "directory to hold credentials.json and generated token")
 	projectPath   = flag.String("projpath", ".", "project path")
 	testListPath  = flag.String("testlist", "tests/regres/full-tests.json", "project relative path to the test list .json file")
 	spreadsheetID = flag.String("spreadsheet", "1RCxbqtKNDG9rVMe_xHMapMBgzOCp24mumab73SbHtfw", "identifier of the spreadsheet to update")
 )

 const (
 	columnGitHash = "GIT_HASH"
 	columnGitDate = "GIT_DATE"
 )

 func main() {
 	flag.Parse()

 	if err := run(); err != nil {
 		log.Fatalln(err)
 	}
 }

 func run() error {
 	// Load the full test list. We use this to find the test file names.
 	lists, err := testlist.Load(".", *testListPath)
 	if err != nil {
 		return cause.Wrap(err, "Unable to load test list")
 	}

 	// Load the creditials used for editing the Google Sheets spreadsheet.
 	srv, err := createSheetsService(*authdir)
 	if err != nil {
 		return cause.Wrap(err, "Unable to authenticate")
 	}

 	// Ensure that there is a sheet for each of the test lists.
 	if err := createTestListSheets(srv, lists); err != nil {
 		return cause.Wrap(err, "Unable to create sheets")
 	}

 	spreadsheet, err := srv.Spreadsheets.Get(*spreadsheetID).Do()
 	if err != nil {
 		return cause.Wrap(err, "Unable to get spreadsheet")
 	}

 	req := sheets.BatchUpdateValuesRequest{
 		ValueInputOption: "RAW",
 	}

 	testListDir := filepath.Dir(filepath.Join(*projectPath, *testListPath))
 	changes, err := git.Log(testListDir, 100)
 	if err != nil {
 		return cause.Wrap(err, "Couldn't get git changes for '%v'", testListDir)
 	}

 	for _, group := range lists {
 		sheetName := group.Name
 		fmt.Println("Processing sheet", sheetName)
 		sheet := getSheet(spreadsheet, sheetName)
 		if sheet == nil {
 			return cause.Wrap(err, "Sheet '%v' not found", sheetName)
 		}

 		columnHeaders, err := fetchRow(srv, spreadsheet, sheet, 0)
 		if err != nil {
 			return cause.Wrap(err, "Couldn't get sheet '%v' column headers", sheetName)
 		}

 		columnIndices := listToMap(columnHeaders)

 		hashColumnIndex, found := columnIndices[columnGitHash]
 		if !found {
 			return cause.Wrap(err, "Couldn't find sheet '%v' column header '%v'", sheetName, columnGitHash)
 		}

 		hashValues, err := fetchColumn(srv, spreadsheet, sheet, hashColumnIndex)
 		if err != nil {
 			return cause.Wrap(err, "Couldn't get sheet '%v' column headers", sheetName)
 		}
 		hashValues = hashValues[1:] // Skip header

 		hashIndices := listToMap(hashValues)
 		rowValues := map[string]interface{}{}

 		rowInsertionPoint := 1 + len(hashValues)

 		for i := len(changes) - 1; i >= 0; i-- {
 			change := changes[i]
 			if !strings.HasPrefix(change.Subject, consts.TestListUpdateCommitSubjectPrefix) {
 				continue
 			}

 			hash := change.Hash.String()
 			if _, found := hashIndices[hash]; found {
 				continue // Already in the sheet
 			}

 			rowValues[columnGitHash] = change.Hash.String()
 			rowValues[columnGitDate] = change.Date.Format("2006-01-02")

 			path := filepath.Join(*projectPath, group.File)
 			hasData := false
 			for _, status := range testlist.Statuses {
 				path := testlist.FilePathWithStatus(path, status)
 				data, err := git.Show(path, hash)
 				if err != nil {
 					continue
 				}
 				lines, err := countLines(data)
 				if err != nil {
 					return cause.Wrap(err, "Couldn't count lines in file '%s'", path)
 				}

 				rowValues[string(status)] = lines
 				hasData = true
 			}

 			if !hasData {
 				continue
 			}

 			data, err := mapToList(columnIndices, rowValues)
 			if err != nil {
 				return cause.Wrap(err, "Couldn't map row values to column for sheet %v. Column headers: [%+v]", sheetName, columnHeaders)
 			}

 			req.Data = append(req.Data, &sheets.ValueRange{
 				Range:  rowRange(rowInsertionPoint, sheet),
 				Values: [][]interface{}{data},
 			})
 			rowInsertionPoint++

 			fmt.Printf("Adding test data at %v to %v\n", hash[:8], sheetName)
 		}
 	}

 	if _, err := srv.Spreadsheets.Values.BatchUpdate(*spreadsheetID, &req).Do(); err != nil {
 		return cause.Wrap(err, "Values BatchUpdate failed")
 	}

 	return nil
 }

 // listToMap returns the list l as a map where the key is the stringification
 // of the element, and the value is the element index.
 func listToMap(l []interface{}) map[string]int {
 	out := map[string]int{}
 	for i, v := range l {
 		out[fmt.Sprint(v)] = i
 	}
 	return out
 }

 // mapToList transforms the two maps into a single slice of values.
 // indices is a map of identifier to output slice element index.
 // values is a map of identifier to value.
 func mapToList(indices map[string]int, values map[string]interface{}) ([]interface{}, error) {
 	out := []interface{}{}
 	for name, value := range values {
 		index, ok := indices[name]
 		if !ok {
 			return nil, fmt.Errorf("No index for '%v'", name)
 		}
 		for len(out) <= index {
 			out = append(out, nil)
 		}
 		out[index] = value
 	}
 	return out, nil
 }

 // countLines returns the number of new lines in the byte slice data.
 func countLines(data []byte) (int, error) {
 	scanner := bufio.NewScanner(bytes.NewReader(data))
 	lines := 0
 	for scanner.Scan() {
 		lines++
 	}
 	return lines, nil
 }

 // getSheet returns the sheet with the given title name, or nil if the sheet
 // cannot be found.
 func getSheet(spreadsheet *sheets.Spreadsheet, name string) *sheets.Sheet {
 	for _, sheet := range spreadsheet.Sheets {
 		if sheet.Properties.Title == name {
 			return sheet
 		}
 	}
 	return nil
 }

 // rowRange returns a sheets range ("name!Ai:i") for the entire row with the
 // given index.
 func rowRange(index int, sheet *sheets.Sheet) string {
 	return fmt.Sprintf("%v!A%v:%v", sheet.Properties.Title, index+1, index+1)
 }

 // columnRange returns a sheets range ("name!i1:i") for the entire column with
 // the given index.
 func columnRange(index int, sheet *sheets.Sheet) string {
 	col := 'A' + index
 	if index > 25 {
 		panic("UNIMPLEMENTED")
 	}
 	return fmt.Sprintf("%v!%c1:%c", sheet.Properties.Title, col, col)
 }

 // fetchRow returns all the values in the given sheet's row.
 func fetchRow(srv *sheets.Service, spreadsheet *sheets.Spreadsheet, sheet *sheets.Sheet, row int) ([]interface{}, error) {
 	rng := rowRange(row, sheet)
 	data, err := srv.Spreadsheets.Values.Get(spreadsheet.SpreadsheetId, rng).Do()
 	if err != nil {
 		return nil, cause.Wrap(err, "Couldn't fetch %v", rng)
 	}
 	return data.Values[0], nil
 }

 // fetchColumn returns all the values in the given sheet's column.
 func fetchColumn(srv *sheets.Service, spreadsheet *sheets.Spreadsheet, sheet *sheets.Sheet, row int) ([]interface{}, error) {
 	rng := columnRange(row, sheet)
 	data, err := srv.Spreadsheets.Values.Get(spreadsheet.SpreadsheetId, rng).Do()
 	if err != nil {
 		return nil, cause.Wrap(err, "Couldn't fetch %v", rng)
 	}
 	out := make([]interface{}, len(data.Values))
 	for i, l := range data.Values {
 		if len(l) > 0 {
 			out[i] = l[0]
 		}
 	}
 	return out, nil
 }

 // insertRows inserts blank rows into the given sheet.
 func insertRows(srv *sheets.Service, spreadsheet *sheets.Spreadsheet, sheet *sheets.Sheet, aboveRow, count int) error {
 	req := sheets.BatchUpdateSpreadsheetRequest{
 		Requests: []*sheets.Request{{
 			InsertRange: &sheets.InsertRangeRequest{
 				Range: &sheets.GridRange{
 					SheetId:       sheet.Properties.SheetId,
 					StartRowIndex: int64(aboveRow),
 					EndRowIndex:   int64(aboveRow + count),
 				},
 				ShiftDimension: "ROWS",
 			}},
 		},
 	}
 	if _, err := srv.Spreadsheets.BatchUpdate(*spreadsheetID, &req).Do(); err != nil {
 		return cause.Wrap(err, "Values BatchUpdate failed")
 	}
 	return nil
 }

 // createTestListSheets adds a new sheet for each of the test lists, if they
 // do not already exist. These new sheets are populated with column headers.
 func createTestListSheets(srv *sheets.Service, testlists testlist.Lists) error {
 	spreadsheet, err := srv.Spreadsheets.Get(*spreadsheetID).Do()
 	if err != nil {
 		return cause.Wrap(err, "Unable to get spreadsheet")
 	}

 	spreadsheetReq := sheets.BatchUpdateSpreadsheetRequest{}
 	updateReq := sheets.BatchUpdateValuesRequest{ValueInputOption: "RAW"}
 	headers := []interface{}{columnGitHash, columnGitDate}
 	for _, s := range testlist.Statuses {
 		headers = append(headers, string(s))
 	}

 	for _, group := range testlists {
 		name := group.Name
 		if getSheet(spreadsheet, name) == nil {
 			spreadsheetReq.Requests = append(spreadsheetReq.Requests, &sheets.Request{
 				AddSheet: &sheets.AddSheetRequest{
 					Properties: &sheets.SheetProperties{
 						Title: name,
 					},
 				},
 			})
 			updateReq.Data = append(updateReq.Data,
 				&sheets.ValueRange{
 					Range:  name + "!A1:Z",
 					Values: [][]interface{}{headers},
 				},
 			)
 		}
 	}

 	if len(spreadsheetReq.Requests) > 0 {
 		if _, err := srv.Spreadsheets.BatchUpdate(*spreadsheetID, &spreadsheetReq).Do(); err != nil {
 			return cause.Wrap(err, "Spreadsheets BatchUpdate failed")
 		}
 	}
 	if len(updateReq.Data) > 0 {
 		if _, err := srv.Spreadsheets.Values.BatchUpdate(*spreadsheetID, &updateReq).Do(); err != nil {
 			return cause.Wrap(err, "Values BatchUpdate failed")
 		}
 	}

 	return nil
 }

 // createSheetsService creates a new Google Sheets service using the credentials
 // in the credentials.json file.
 func createSheetsService(authdir string) (*sheets.Service, error) {
 	authdir = os.ExpandEnv(authdir)
 	if home, err := os.UserHomeDir(); err == nil {
 		authdir = strings.ReplaceAll(authdir, "~", home)
 	}

 	os.MkdirAll(authdir, 0777)

 	credentialsPath := filepath.Join(authdir, "credentials.json")
 	b, err := ioutil.ReadFile(credentialsPath)
 	if err != nil {
 		return nil, cause.Wrap(err, "Unable to read client secret file '%v'\n"+
 			"Obtain this file from: https://console.developers.google.com/apis/credentials", credentialsPath)
 	}

 	config, err := google.ConfigFromJSON(b, "https://www.googleapis.com/auth/spreadsheets")
 	if err != nil {
 		return nil, cause.Wrap(err, "Unable to parse client secret file to config")
 	}

 	client, err := getClient(authdir, config)
 	if err != nil {
 		return nil, cause.Wrap(err, "Unable obtain client")
 	}

 	srv, err := sheets.New(client)
 	if err != nil {
 		return nil, cause.Wrap(err, "Unable to retrieve Sheets client")
 	}
 	return srv, nil
 }

 // Retrieve a token, saves the token, then returns the generated client.
 func getClient(authdir string, config *oauth2.Config) (*http.Client, error) {
 	// The file token.json stores the user's access and refresh tokens, and is
 	// created automatically when the authorization flow completes for the first
 	// time.
 	tokFile := filepath.Join(authdir, "token.json")
 	tok, err := tokenFromFile(tokFile)
 	if err != nil {
 		tok, err = getTokenFromWeb(config)
 		if err != nil {
 			return nil, cause.Wrap(err, "Unable to get token from web")
 		}
 		if err := saveToken(tokFile, tok); err != nil {
 			log.Println("Warning: failed to write token: %v", err)
 		}
 	}
 	return config.Client(context.Background(), tok), nil
 }

 // Request a token from the web, then returns the retrieved token.
 func getTokenFromWeb(config *oauth2.Config) (*oauth2.Token, error) {
 	authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
 	fmt.Printf("Go to the following link in your browser then type the "+
 		"authorization code: \n%v\n", authURL)

 	var authCode string
 	if _, err := fmt.Scan(&authCode); err != nil {
 		return nil, cause.Wrap(err, "Unable to read authorization code")
 	}

 	tok, err := config.Exchange(context.TODO(), authCode)
 	if err != nil {
 		return nil, cause.Wrap(err, "Unable to retrieve token from web")
 	}
 	return tok, nil
 }

 // Retrieves a token from a local file.
 func tokenFromFile(path string) (*oauth2.Token, error) {
 	f, err := os.Open(path)
 	if err != nil {
 		return nil, err
 	}
 	defer f.Close()
 	tok := &oauth2.Token{}
 	err = json.NewDecoder(f).Decode(tok)
 	return tok, err
 }

 // Saves a token to a file path.
 func saveToken(path string, token *oauth2.Token) error {
 	fmt.Printf("Saving credential file to: %s\n", path)
 	f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
 	if err != nil {
 		return cause.Wrap(err, "Unable to cache oauth token")
 	}
 	defer f.Close()
 	json.NewEncoder(f).Encode(token)
 	return nil
 }
	// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
	//
	// 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.

	// export_to_sheets updates a Google sheets document with the latest test
	// results
	package main

	import (
	"bufio"
	"bytes"
	"context"
	"encoding/json"
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strings"

	"../../cause"
	"../../consts"
	"../../git"
	"../../testlist"

	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
	"google.golang.org/api/sheets/v4"
	)

	var (
	authdir = flag.String("authdir", "~/.regres-auth", "directory to hold credentials.json and generated token")
	projectPath = flag.String("projpath", ".", "project path")
	testListPath = flag.String("testlist", "tests/regres/full-tests.json", "project relative path to the test list .json file")
	spreadsheetID = flag.String("spreadsheet", "1RCxbqtKNDG9rVMe_xHMapMBgzOCp24mumab73SbHtfw", "identifier of the spreadsheet to update")
	)

	const (
	columnGitHash = "GIT_HASH"
	columnGitDate = "GIT_DATE"
	)

	func main() {
	flag.Parse()

	if err := run(); err != nil {
	log.Fatalln(err)
	}
	}

	func run() error {
	// Load the full test list. We use this to find the test file names.
	lists, err := testlist.Load(".", *testListPath)
	if err != nil {
	return cause.Wrap(err, "Unable to load test list")
	}

	// Load the creditials used for editing the Google Sheets spreadsheet.
	srv, err := createSheetsService(*authdir)
	if err != nil {
	return cause.Wrap(err, "Unable to authenticate")
	}

	// Ensure that there is a sheet for each of the test lists.
	if err := createTestListSheets(srv, lists); err != nil {
	return cause.Wrap(err, "Unable to create sheets")
	}

	spreadsheet, err := srv.Spreadsheets.Get(*spreadsheetID).Do()
	if err != nil {
	return cause.Wrap(err, "Unable to get spreadsheet")
	}

	req := sheets.BatchUpdateValuesRequest{
	ValueInputOption: "RAW",
	}

	testListDir := filepath.Dir(filepath.Join(projectPath, testListPath))
	changes, err := git.Log(testListDir, 100)
	if err != nil {
	return cause.Wrap(err, "Couldn't get git changes for '%v'", testListDir)
	}

	for _, group := range lists {
	sheetName := group.Name
	fmt.Println("Processing sheet", sheetName)
	sheet := getSheet(spreadsheet, sheetName)
	if sheet == nil {
	return cause.Wrap(err, "Sheet '%v' not found", sheetName)
	}

	columnHeaders, err := fetchRow(srv, spreadsheet, sheet, 0)
	if err != nil {
	return cause.Wrap(err, "Couldn't get sheet '%v' column headers", sheetName)
	}

	columnIndices := listToMap(columnHeaders)

	hashColumnIndex, found := columnIndices[columnGitHash]
	if !found {
	return cause.Wrap(err, "Couldn't find sheet '%v' column header '%v'", sheetName, columnGitHash)
	}

	hashValues, err := fetchColumn(srv, spreadsheet, sheet, hashColumnIndex)
	if err != nil {
	return cause.Wrap(err, "Couldn't get sheet '%v' column headers", sheetName)
	}
	hashValues = hashValues[1:] // Skip header

	hashIndices := listToMap(hashValues)
	rowValues := map[string]interface{}{}

	rowInsertionPoint := 1 + len(hashValues)

	for i := len(changes) - 1; i >= 0; i-- {
	change := changes[i]
	if !strings.HasPrefix(change.Subject, consts.TestListUpdateCommitSubjectPrefix) {
	continue
	}

	hash := change.Hash.String()
	if _, found := hashIndices[hash]; found {
	continue // Already in the sheet
	}

	rowValues[columnGitHash] = change.Hash.String()
	rowValues[columnGitDate] = change.Date.Format("2006-01-02")

	path := filepath.Join(*projectPath, group.File)
	hasData := false
	for _, status := range testlist.Statuses {
	path := testlist.FilePathWithStatus(path, status)
	data, err := git.Show(path, hash)
	if err != nil {
	continue
	}
	lines, err := countLines(data)
	if err != nil {
	return cause.Wrap(err, "Couldn't count lines in file '%s'", path)
	}

	rowValues[string(status)] = lines
	hasData = true
	}

	if !hasData {
	continue
	}

	data, err := mapToList(columnIndices, rowValues)
	if err != nil {
	return cause.Wrap(err, "Couldn't map row values to column for sheet %v. Column headers: [%+v]", sheetName, columnHeaders)
	}

	req.Data = append(req.Data, &sheets.ValueRange{
	Range: rowRange(rowInsertionPoint, sheet),
	Values: [][]interface{}{data},
	})
	rowInsertionPoint++

	fmt.Printf("Adding test data at %v to %v\n", hash[:8], sheetName)
	}
	}

	if _, err := srv.Spreadsheets.Values.BatchUpdate(*spreadsheetID, &req).Do(); err != nil {
	return cause.Wrap(err, "Values BatchUpdate failed")
	}

	return nil
	}

	// listToMap returns the list l as a map where the key is the stringification
	// of the element, and the value is the element index.
	func listToMap(l []interface{}) map[string]int {
	out := map[string]int{}
	for i, v := range l {
	out[fmt.Sprint(v)] = i
	}
	return out
	}

	// mapToList transforms the two maps into a single slice of values.
	// indices is a map of identifier to output slice element index.
	// values is a map of identifier to value.
	func mapToList(indices map[string]int, values map[string]interface{}) ([]interface{}, error) {
	out := []interface{}{}
	for name, value := range values {
	index, ok := indices[name]
	if !ok {
	return nil, fmt.Errorf("No index for '%v'", name)
	}
	for len(out) <= index {
	out = append(out, nil)
	}
	out[index] = value
	}
	return out, nil
	}

	// countLines returns the number of new lines in the byte slice data.
	func countLines(data []byte) (int, error) {
	scanner := bufio.NewScanner(bytes.NewReader(data))
	lines := 0
	for scanner.Scan() {
	lines++
	}
	return lines, nil
	}

	// getSheet returns the sheet with the given title name, or nil if the sheet
	// cannot be found.
	func getSheet(spreadsheet sheets.Spreadsheet, name string) sheets.Sheet {
	for _, sheet := range spreadsheet.Sheets {
	if sheet.Properties.Title == name {
	return sheet
	}
	}
	return nil
	}

	// rowRange returns a sheets range ("name!Ai:i") for the entire row with the
	// given index.
	func rowRange(index int, sheet *sheets.Sheet) string {
	return fmt.Sprintf("%v!A%v:%v", sheet.Properties.Title, index+1, index+1)
	}

	// columnRange returns a sheets range ("name!i1:i") for the entire column with
	// the given index.
	func columnRange(index int, sheet *sheets.Sheet) string {
	col := 'A' + index
	if index > 25 {
	panic("UNIMPLEMENTED")
	}
	return fmt.Sprintf("%v!%c1:%c", sheet.Properties.Title, col, col)
	}

	// fetchRow returns all the values in the given sheet's row.
	func fetchRow(srv sheets.Service, spreadsheet sheets.Spreadsheet, sheet *sheets.Sheet, row int) ([]interface{}, error) {
	rng := rowRange(row, sheet)
	data, err := srv.Spreadsheets.Values.Get(spreadsheet.SpreadsheetId, rng).Do()
	if err != nil {
	return nil, cause.Wrap(err, "Couldn't fetch %v", rng)
	}
	return data.Values[0], nil
	}

	// fetchColumn returns all the values in the given sheet's column.
	func fetchColumn(srv sheets.Service, spreadsheet sheets.Spreadsheet, sheet *sheets.Sheet, row int) ([]interface{}, error) {
	rng := columnRange(row, sheet)
	data, err := srv.Spreadsheets.Values.Get(spreadsheet.SpreadsheetId, rng).Do()
	if err != nil {
	return nil, cause.Wrap(err, "Couldn't fetch %v", rng)
	}
	out := make([]interface{}, len(data.Values))
	for i, l := range data.Values {
	if len(l) > 0 {
	out[i] = l[0]
	}
	}
	return out, nil
	}

	// insertRows inserts blank rows into the given sheet.
	func insertRows(srv sheets.Service, spreadsheet sheets.Spreadsheet, sheet *sheets.Sheet, aboveRow, count int) error {
	req := sheets.BatchUpdateSpreadsheetRequest{
	Requests: []*sheets.Request{{
	InsertRange: &sheets.InsertRangeRequest{
	Range: &sheets.GridRange{
	SheetId: sheet.Properties.SheetId,
	StartRowIndex: int64(aboveRow),
	EndRowIndex: int64(aboveRow + count),
	},
	ShiftDimension: "ROWS",
	}},
	},
	}
	if _, err := srv.Spreadsheets.BatchUpdate(*spreadsheetID, &req).Do(); err != nil {
	return cause.Wrap(err, "Values BatchUpdate failed")
	}
	return nil
	}

	// createTestListSheets adds a new sheet for each of the test lists, if they
	// do not already exist. These new sheets are populated with column headers.
	func createTestListSheets(srv *sheets.Service, testlists testlist.Lists) error {
	spreadsheet, err := srv.Spreadsheets.Get(*spreadsheetID).Do()
	if err != nil {
	return cause.Wrap(err, "Unable to get spreadsheet")
	}

	spreadsheetReq := sheets.BatchUpdateSpreadsheetRequest{}
	updateReq := sheets.BatchUpdateValuesRequest{ValueInputOption: "RAW"}
	headers := []interface{}{columnGitHash, columnGitDate}
	for _, s := range testlist.Statuses {
	headers = append(headers, string(s))
	}

	for _, group := range testlists {
	name := group.Name
	if getSheet(spreadsheet, name) == nil {
	spreadsheetReq.Requests = append(spreadsheetReq.Requests, &sheets.Request{
	AddSheet: &sheets.AddSheetRequest{
	Properties: &sheets.SheetProperties{
	Title: name,
	},
	},
	})
	updateReq.Data = append(updateReq.Data,
	&sheets.ValueRange{
	Range: name + "!A1:Z",
	Values: [][]interface{}{headers},
	},
	)
	}
	}

	if len(spreadsheetReq.Requests) > 0 {
	if _, err := srv.Spreadsheets.BatchUpdate(*spreadsheetID, &spreadsheetReq).Do(); err != nil {
	return cause.Wrap(err, "Spreadsheets BatchUpdate failed")
	}
	}
	if len(updateReq.Data) > 0 {
	if _, err := srv.Spreadsheets.Values.BatchUpdate(*spreadsheetID, &updateReq).Do(); err != nil {
	return cause.Wrap(err, "Values BatchUpdate failed")
	}
	}

	return nil
	}

	// createSheetsService creates a new Google Sheets service using the credentials
	// in the credentials.json file.
	func createSheetsService(authdir string) (*sheets.Service, error) {
	authdir = os.ExpandEnv(authdir)
	if home, err := os.UserHomeDir(); err == nil {
	authdir = strings.ReplaceAll(authdir, "~", home)
	}

	os.MkdirAll(authdir, 0777)

	credentialsPath := filepath.Join(authdir, "credentials.json")
	b, err := ioutil.ReadFile(credentialsPath)
	if err != nil {
	return nil, cause.Wrap(err, "Unable to read client secret file '%v'\n"+
	"Obtain this file from: https://console.developers.google.com/apis/credentials", credentialsPath)
	}

	config, err := google.ConfigFromJSON(b, "https://www.googleapis.com/auth/spreadsheets")
	if err != nil {
	return nil, cause.Wrap(err, "Unable to parse client secret file to config")
	}

	client, err := getClient(authdir, config)
	if err != nil {
	return nil, cause.Wrap(err, "Unable obtain client")
	}

	srv, err := sheets.New(client)
	if err != nil {
	return nil, cause.Wrap(err, "Unable to retrieve Sheets client")
	}
	return srv, nil
	}

	// Retrieve a token, saves the token, then returns the generated client.
	func getClient(authdir string, config oauth2.Config) (http.Client, error) {
	// The file token.json stores the user's access and refresh tokens, and is
	// created automatically when the authorization flow completes for the first
	// time.
	tokFile := filepath.Join(authdir, "token.json")
	tok, err := tokenFromFile(tokFile)
	if err != nil {
	tok, err = getTokenFromWeb(config)
	if err != nil {
	return nil, cause.Wrap(err, "Unable to get token from web")
	}
	if err := saveToken(tokFile, tok); err != nil {
	log.Println("Warning: failed to write token: %v", err)
	}
	}
	return config.Client(context.Background(), tok), nil
	}

	// Request a token from the web, then returns the retrieved token.
	func getTokenFromWeb(config oauth2.Config) (oauth2.Token, error) {
	authURL := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
	fmt.Printf("Go to the following link in your browser then type the "+
	"authorization code: \n%v\n", authURL)

	var authCode string
	if _, err := fmt.Scan(&authCode); err != nil {
	return nil, cause.Wrap(err, "Unable to read authorization code")
	}

	tok, err := config.Exchange(context.TODO(), authCode)
	if err != nil {
	return nil, cause.Wrap(err, "Unable to retrieve token from web")
	}
	return tok, nil
	}

	// Retrieves a token from a local file.
	func tokenFromFile(path string) (*oauth2.Token, error) {
	f, err := os.Open(path)
	if err != nil {
	return nil, err
	}
	defer f.Close()
	tok := &oauth2.Token{}
	err = json.NewDecoder(f).Decode(tok)
	return tok, err
	}

	// Saves a token to a file path.
	func saveToken(path string, token *oauth2.Token) error {
	fmt.Printf("Saving credential file to: %s\n", path)
	f, err := os.OpenFile(path, os.O_RDWR\|os.O_CREATE\|os.O_TRUNC, 0600)
	if err != nil {
	return cause.Wrap(err, "Unable to cache oauth token")
	}
	defer f.Close()
	json.NewEncoder(f).Encode(token)
	return nil
	}