Add check for input file in CLI Run method

cli/cli.go

@@ -15,6 +15,7 @@ import (
 	"github.com/catatsuy/notify_slack/config"
 	"github.com/catatsuy/notify_slack/slack"
 	"github.com/catatsuy/notify_slack/throttle"
+	"golang.org/x/term"
 )
 
 var (
@@ -106,6 +107,9 @@ func (c *CLI) Run(args []string) int {
 			fmt.Fprintln(c.errStream, "You cannot pass multiple files")
 			return ExitCodeParseFlagError
 		}
+	} else if term.IsTerminal(int(os.Stdin.Fd())) {
+		fmt.Fprintln(c.errStream, "No input file specified")
+		return ExitCodeFail
 	}
 
 	tomlFile = config.LoadTOMLFilename(tomlFile)

cli/cli_test.go

@@ -4,6 +4,9 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"io"
+	"os"
+	"runtime"
 	"strings"
 	"testing"
 
@@ -42,6 +45,42 @@ func TestRun_versionFlg(t *testing.T) {
 	}
 }
 
+func TestRun_providedStdin(t *testing.T) {
+	errStream, inputStream := new(bytes.Buffer), new(bytes.Buffer)
+
+	// cf: https://cs.opensource.google/go/x/term/+/master:term_test.go
+	if runtime.GOOS != "linux" {
+		t.Skipf("unknown terminal path for GOOS %v", runtime.GOOS)
+	}
+	file, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer file.Close()
+
+	var outStream io.Writer = file
+
+	cl := &CLI{
+		outStream:   outStream,
+		errStream:   errStream,
+		inputStream: inputStream,
+		sClient:     &fakeSlackClient{},
+		conf:        config.NewConfig(),
+	}
+
+	args := strings.Split("notify_slack", " ")
+	status := cl.Run(args)
+
+	if status != ExitCodeFail {
+		t.Errorf("ExitStatus=%d, want %d", status, ExitCodeOK)
+	}
+
+	expected := "No input file specified"
+	if !strings.Contains(errStream.String(), expected) {
+		t.Errorf("Output=%q, want %q", errStream.String(), expected)
+	}
+}
+
 func TestUploadSnippet(t *testing.T) {
 	cl := &CLI{
 		sClient: &fakeSlackClient{},

go.mod

@@ -1,5 +1,10 @@
 module github.com/catatsuy/notify_slack
 
-go 1.19
+go 1.22.1
 
-require github.com/pelletier/go-toml/v2 v2.2.0
+require (
+	github.com/pelletier/go-toml/v2 v2.2.0
+	golang.org/x/term v0.18.0
+)
+
+require golang.org/x/sys v0.18.0 // indirect

go.sum

@@ -14,6 +14,10 @@ github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
+golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.18.0 h1:FcHjZXDMxI8mM3nwhX9HlKop4C0YQvCVCdwYl2wOtE8=
+golang.org/x/term v0.18.0/go.mod h1:ILwASektA3OnRv7amZ1xhE/KTR+u50pbXfZ03+6Nx58=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=