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// Copyright 2018 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

package main

import (

"errors"

"flag"

"fmt"

"io"

"os"

"os/exec"

"strings"

"sync/atomic"

"github.com/cli/go-internal/goproxytest"

"github.com/cli/go-internal/gotooltest"

"github.com/cli/go-internal/testscript"

"github.com/cli/go-internal/testscript/plugin"

)

type envVarsFlag struct {

vals []string

}

func (e *envVarsFlag) String() string {

return fmt.Sprintf("%v", e.vals)

}

func (e *envVarsFlag) Set(v string) error {

e.vals = append(e.vals, v)

return nil

}

func main() {

switch err := mainerr(); err {

case nil:

default:

fmt.Fprintln(os.Stderr, err)

os.Exit(1)

}

}

func mainerr() (retErr error) {

flag.Usage = func() {

mainUsage(os.Stderr)

os.Exit(2)

}

var envVars envVarsFlag

fUpdate := flag.Bool("u", false, "update archive file if a cmp fails")

fWork := flag.Bool("work", false, "print temporary work directory and do not remove when done")

fContinue := flag.Bool("continue", false, "continue running the script if an error occurs")

fVerbose := flag.Bool("v", false, "run tests verbosely")

flag.Var(&envVars, "e", "pass through environment variable to script (can appear multiple times)")

flag.Parse()

files := flag.Args()

if len(files) == 0 {

files = []string{"-"}

}

// If we are only reading from stdin, -u cannot be specified. It seems a bit

// bizarre to invoke testscript with '-' and a regular file, but hey. In

// that case the -u flag will only apply to the regular file and we assume

// the user knows it.

onlyReadFromStdin := true

for _, f := range files {

if f != "-" {

onlyReadFromStdin = false

}

}

if onlyReadFromStdin && *fUpdate {

return fmt.Errorf("cannot use -u when reading from stdin")

}

var stdinTempFile string

for i, f := range files {

if f != "-" {

continue

}

if stdinTempFile != "" {

return fmt.Errorf("cannot read stdin twice")

}

data, err := io.ReadAll(os.Stdin)

if err != nil {

return fmt.Errorf("error reading stdin: %v", err)

}

f, err := os.CreateTemp("", "stdin*.txtar")

if err != nil {

return err

}

if _, err := f.Write(data); err != nil {

return err

}

if err := f.Close(); err != nil {

return err

}

stdinTempFile = f.Name()

files[i] = stdinTempFile

defer os.Remove(stdinTempFile)

}

p := testscript.Params{

Setup: func(*testscript.Env) error { return nil },

Files: files,

UpdateScripts: *fUpdate,

ContinueOnError: *fContinue,

TestWork: *fWork,

}

cleanup, err := plugin.Setup(&p)

if err != nil {

return err

}

defer cleanup()

if _, err := exec.LookPath("go"); err == nil {

if err := gotooltest.Setup(&p); err != nil {

return fmt.Errorf("failed to setup go tool: %v", err)

}

}

// When a script provides a .gomodproxy directory, serve those modules

// from a local proxy, overriding any GOPROXY set above.

goproxytest.Setup(&p)

origSetup := p.Setup

p.Setup = func(env *testscript.Env) error {

if err := origSetup(env); err != nil {

return err

}

if *fWork {

env.T().Log("temporary work directory: ", env.WorkDir)

}

for _, v := range envVars.vals {

varName, _, ok := strings.Cut(v, "=")

if !ok {

v += "=" + os.Getenv(v)

}

switch varName {

case "":

return fmt.Errorf("invalid variable name %q", varName)

case "WORK":

return fmt.Errorf("cannot override WORK variable")

}

env.Vars = append(env.Vars, v)

}

return nil

}

r := &runT{

verbose: *fVerbose,

stdinTempFile: stdinTempFile,

}

r.Run("", func(t testscript.T) {

testscript.RunT(t, p)

})

if r.failed.Load() {

return failedRun

}

return nil

}

var (

failedRun = errors.New("failed run")

skipRun = errors.New("skip")

)

// runT implements testscript.T and is used in the call to testscript.Run

type runT struct {

verbose bool

stdinTempFile string

failed atomic.Bool

}

func (r *runT) Skip(is ...any) {

panic(skipRun)

}

func (r *runT) Fatal(is ...any) {

r.Log(is...)

r.FailNow()

}

func (r *runT) Parallel() {

// TODO run tests in parallel.

}

func (r *runT) Log(is ...any) {

msg := fmt.Sprint(is...)

if r.stdinTempFile != "" {

msg = strings.ReplaceAll(msg, r.stdinTempFile, "<stdin>")

}

if !strings.HasSuffix(msg, "\n") {

msg += "\n"

}

fmt.Print(msg)

}

func (r *runT) FailNow() {

panic(failedRun)

}

func (r *runT) Run(name string, f func(t testscript.T)) {

// TODO: perhaps log the test name when there's more

// than one test file?

defer func() {

switch err := recover(); err {

case nil, skipRun:

case failedRun:

r.failed.Store(true)

default:

panic(fmt.Errorf("unexpected panic: %v [%T]", err, err))

}

}()

f(r)

}

func (r *runT) Verbose() bool {

return r.verbose

}