remove 'isatty' because isatty==false in CI server

cmd/reviewdog/main.go

@@ -25,7 +25,6 @@ import (
 	"github.com/haya14busa/errorformat/fmts"
 	"github.com/haya14busa/reviewdog"
 	"github.com/haya14busa/reviewdog/project"
-	isatty "github.com/mattn/go-isatty"
 	"github.com/mattn/go-shellwords"
 )
 
@@ -45,8 +44,6 @@ type option struct {
 	name      string // tool name which is used in comment
 	ci        string
 	conf      string
-
-	isatty bool // it's not specified by flag
 }
 
 // flags doc
@@ -89,8 +86,6 @@ func init() {
 	flag.StringVar(&opt.name, "name", "", nameDoc)
 	flag.StringVar(&opt.ci, "ci", "", ciDoc)
 	flag.StringVar(&opt.conf, "conf", "reviewdog.yml", confDoc)
-
-	opt.isatty = isatty.IsTerminal(os.Stdin.Fd())
 }
 
 func usage() {
@@ -116,7 +111,8 @@ func run(r io.Reader, w io.Writer, opt *option) error {
 		return runList(w)
 	}
 
-	isProject := opt.isatty && len(opt.efms) == 0 && opt.f == ""
+	// assume it's project based run when both -efm ane -f are not specified
+	isProject := len(opt.efms) == 0 && opt.f == ""
 
 	var cs reviewdog.CommentService
 	var ds reviewdog.DiffService

cmd/reviewdog/main_test.go

@@ -71,8 +71,7 @@ line3
 func TestRun_project(t *testing.T) {
 	t.Run("diff command is empty", func(t *testing.T) {
 		opt := &option{
-			conf:   "reviewdog.yml",
-			isatty: true,
+			conf: "reviewdog.yml",
 		}
 		stdout := new(bytes.Buffer)
 		if err := run(nil, stdout, opt); err == nil {
@@ -86,7 +85,6 @@ func TestRun_project(t *testing.T) {
 		opt := &option{
 			conf:    "reviewdog.notfound.yml",
 			diffCmd: "echo ''",
-			isatty:  true,
 		}
 		stdout := new(bytes.Buffer)
 		if err := run(nil, stdout, opt); err == nil {
@@ -107,7 +105,6 @@ func TestRun_project(t *testing.T) {
 		opt := &option{
 			conf:    conffile.Name(),
 			diffCmd: "echo ''",
-			isatty:  true,
 		}
 		stdout := new(bytes.Buffer)
 		if err := run(nil, stdout, opt); err == nil {
@@ -128,7 +125,6 @@ func TestRun_project(t *testing.T) {
 		opt := &option{
 			conf:    conffile.Name(),
 			diffCmd: "echo ''",
-			isatty:  true,
 		}
 		stdout := new(bytes.Buffer)
 		if err := run(nil, stdout, opt); err != nil {