Implement new Go based Desktop app

This focuses on Windows first, but coudl be used for Mac
and possibly linux in the future.

cmd/start_windows.go

@@ -0,0 +1,81 @@
+package cmd
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"syscall"
+
+	"golang.org/x/sys/windows"
+
+	"github.com/jmorganca/ollama/api"
+)
+
+func init() {
+	var inMode uint32
+	var outMode uint32
+	var errMode uint32
+
+	in := windows.Handle(os.Stdin.Fd())
+	if err := windows.GetConsoleMode(in, &inMode); err == nil {
+		windows.SetConsoleMode(in, inMode|windows.ENABLE_VIRTUAL_TERMINAL_INPUT) //nolint:errcheck
+	}
+
+	out := windows.Handle(os.Stdout.Fd())
+	if err := windows.GetConsoleMode(out, &outMode); err == nil {
+		windows.SetConsoleMode(out, outMode|windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING) //nolint:errcheck
+	}
+
+	errf := windows.Handle(os.Stderr.Fd())
+	if err := windows.GetConsoleMode(errf, &errMode); err == nil {
+		windows.SetConsoleMode(errf, errMode|windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING) //nolint:errcheck
+	}
+}
+
+func startApp(ctx context.Context, client *api.Client) error {
+	// log.Printf("XXX Attempting to find and start ollama app")
+	AppName := "ollama app.exe"
+	exe, err := os.Executable()
+	if err != nil {
+		return err
+	}
+	appExe := filepath.Join(filepath.Dir(exe), AppName)
+	_, err = os.Stat(appExe)
+	if errors.Is(err, os.ErrNotExist) {
+		// Try the standard install location
+		localAppData := os.Getenv("LOCALAPPDATA")
+		appExe = filepath.Join(localAppData, "Ollama", AppName)
+		_, err := os.Stat(appExe)
+		if errors.Is(err, os.ErrNotExist) {
+			// Finally look in the path
+			appExe, err = exec.LookPath(AppName)
+			if err != nil {
+				return fmt.Errorf("could not locate ollama app")
+			}
+		}
+	}
+	// log.Printf("XXX attempting to start app %s", appExe)
+
+	cmd_path := "c:\\Windows\\system32\\cmd.exe"
+	cmd := exec.Command(cmd_path, "/c", appExe)
+	// TODO - these hide flags aren't working - still pops up a command window for some reason
+	cmd.SysProcAttr = &syscall.SysProcAttr{CreationFlags: 0x08000000, HideWindow: true}
+
+	// TODO this didn't help either...
+	cmd.Stdin = strings.NewReader("")
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	if err := cmd.Start(); err != nil {
+		return fmt.Errorf("unable to start ollama app %w", err)
+	}
+
+	if cmd.Process != nil {
+		defer cmd.Process.Release() //nolint:errcheck
+	}
+	return waitForServer(ctx, client)
+}