Working example of piping commands

go.mod

@@ -0,0 +1,3 @@
+module gosay
+
+go 1.24.1

main.go

@@ -0,0 +1,59 @@
+// https://www.dolthub.com/blog/2022-11-28-go-os-exec-patterns/
+
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"log/slog"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+var rawPiperCmd = strings.Split("piper --model /home/toor/piper_models/en_US-ryan-medium.onnx --output-raw", " ")
+var rawAplayCmd = strings.Split("aplay -r 22050 -f S16_LE -t raw -", " ")
+
+func say(msg []byte) error {
+	buf := new(bytes.Buffer)
+	buf.Write(msg)
+	r, w, err := os.Pipe()
+	if err != nil {
+		return err
+	}
+	defer r.Close()
+	piperCmd := exec.Command(rawPiperCmd[0], rawPiperCmd[1:]...)
+	piperCmd.Stdin = buf
+	piperCmd.Stdout = w
+	err = piperCmd.Start()
+	if err != nil {
+		return err
+	}
+	w.Close()
+	defer piperCmd.Wait()
+
+	aplayCmd := exec.Command(rawAplayCmd[0], rawAplayCmd[1:]...)
+	aplayCmd.Stdin = r
+	return aplayCmd.Run()
+}
+
+func main() {
+	fmt.Println("Go say!")
+	reader := bufio.NewReader(os.Stdin)
+
+	for {
+		fmt.Println("Give me something to say: ")
+		msg, err := reader.ReadString('\n')
+		if err != nil {
+			slog.Error("encoutered error reading from stdin", "error", err)
+			continue
+		}
+		contents := strings.TrimSpace(msg)
+		err = say([]byte(contents))
+		if err != nil {
+			slog.Error("encountered error in say command", "error", err)
+		}
+	}
+
+}