Detect if STDIN is terminal and print hint

Signed-off-by: eternal-flame-AD <[email protected]>

command/read.go

@@ -3,23 +3,37 @@ package command
 import (
 	"bufio"
 	"errors"
+	"fmt"
 	"io"
+	"os"
+	"runtime"
 	"strings"
 
 	"github.com/gotify/cli/v2/utils"
+	"github.com/mattn/go-isatty"
 )
 
 func readMessage(args []string, r io.Reader, output chan<- string, splitOnNull bool) {
 	defer close(output)
 
-	switch {
-	case len(args) > 0:
+	if len(args) > 0 {
 		if utils.ProbeStdin(r) {
 			utils.Exit1With("message is set via arguments and stdin, use only one of them")
 		}
 
 		output <- strings.Join(args, " ")
-	case splitOnNull:
+		return
+	}
+
+	if isatty.IsTerminal(os.Stdin.Fd()) {
+		eofKey := "Ctrl+D"
+		if runtime.GOOS == "windows" {
+			eofKey = "Ctrl+Z"
+		}
+		fmt.Fprintf(os.Stderr, "Enter your message, press Enter and then %s to finish:\n", eofKey)
+	}
+
+	if splitOnNull {
 		read := bufio.NewReader(r)
 		for {
 			s, err := read.ReadString('\x00')
@@ -37,7 +51,7 @@ func readMessage(args []string, r io.Reader, output chan<- string, splitOnNull b
 				}
 			}
 		}
-	default:
+	} else {
 		bytes, err := io.ReadAll(r)
 		if err != nil {
 			utils.Exit1With("cannot read", err)

go.mod

@@ -27,6 +27,7 @@ require (
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/oklog/ulid v1.3.1 // indirect
 	github.com/opentracing/opentracing-go v1.2.0 // indirect

go.sum

@@ -61,6 +61,8 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/mailru/easyjson v0.0.0-20180823135443-60711f1a8329/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
 github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
 github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
@@ -94,6 +96,7 @@ golang.org/x/net v0.0.0-20181005035420-146acd28ed58/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
 golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
 golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.21.0 h1:WVXCp+/EBEHOj53Rvu+7KiT/iElMrO8ACK16SMZ3jaA=