Add first cut at golang monitor program

monitor/devrunner.go

@@ -0,0 +1,84 @@
+// a vibe coded el cheapo: https://claude.ai/chat/328ca558-1019-49b9-9f08-e85cfcea2ceb
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"sync"
+	"time"
+)
+
+func runProcess(ctx context.Context, wg *sync.WaitGroup, name, command string) {
+	defer wg.Done()
+
+	for {
+		select {
+		case <-ctx.Done():
+			fmt.Printf("[%s] Stopping\n", name)
+			return
+		default:
+			fmt.Printf("[%s] Starting: %s\n", name, command)
+
+			// Create command with context for cancellation
+			cmd := exec.CommandContext(ctx, "sh", "-c", command)
+
+			// Setup stdout pipe
+			stdout, err := cmd.StdoutPipe()
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "[%s] Error creating stdout pipe: %v\n", name, err)
+				return
+			}
+
+			// Setup stderr pipe
+			stderr, err := cmd.StderrPipe()
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "[%s] Error creating stderr pipe: %v\n", name, err)
+				return
+			}
+
+			// Start the command
+			if err := cmd.Start(); err != nil {
+				fmt.Fprintf(os.Stderr, "[%s] Error starting command: %v\n", name, err)
+				time.Sleep(time.Second)
+				continue
+			}
+
+			// Copy output in separate goroutines
+			var ioWg sync.WaitGroup
+			ioWg.Add(2)
+
+			go func() {
+				defer ioWg.Done()
+				io.Copy(os.Stdout, stdout)
+			}()
+
+			go func() {
+				defer ioWg.Done()
+				io.Copy(os.Stderr, stderr)
+			}()
+
+			// Wait for command to finish
+			err = cmd.Wait()
+			ioWg.Wait() // Ensure all output is copied
+
+			// Check if we should restart
+			select {
+			case <-ctx.Done():
+				fmt.Printf("[%s] Stopped\n", name)
+				return
+			default:
+				if err != nil {
+					fmt.Fprintf(os.Stderr, "[%s] Process exited with error: %v\n", name, err)
+				} else {
+					fmt.Printf("[%s] Process exited normally\n", name)
+				}
+				fmt.Printf("[%s] Restarting in 1 second...\n", name)
+				time.Sleep(time.Second)
+			}
+		}
+	}
+}