feat: add supervisor prototype with embedded frontend

internal/session/process.go

@@ -0,0 +1,53 @@
+package session
+
+import (
+	"os"
+	"os/exec"
+	"syscall"
+
+	"github.com/creack/pty"
+)
+
+type DefaultPTYFactory struct{}
+
+type shellProcess struct {
+	cmd *exec.Cmd
+	pty *os.File
+}
+
+func (f DefaultPTYFactory) Start(command string) (PTYProcess, error) {
+	cmd := exec.Command("bash", "-lc", command)
+	cmd.Env = os.Environ()
+	ptmx, err := pty.Start(cmd)
+	if err != nil {
+		return nil, err
+	}
+	return &shellProcess{cmd: cmd, pty: ptmx}, nil
+}
+
+func (p *shellProcess) Read(b []byte) (int, error) {
+	return p.pty.Read(b)
+}
+
+func (p *shellProcess) Write(b []byte) (int, error) {
+	return p.pty.Write(b)
+}
+
+func (p *shellProcess) Close() error {
+	return p.pty.Close()
+}
+
+func (p *shellProcess) Wait() error {
+	return p.cmd.Wait()
+}
+
+func (p *shellProcess) Resize(cols, rows uint16) error {
+	return pty.Setsize(p.pty, &pty.Winsize{Cols: cols, Rows: rows})
+}
+
+func (p *shellProcess) SignalStop() error {
+	if p.cmd.Process == nil {
+		return nil
+	}
+	return p.cmd.Process.Signal(syscall.SIGTERM)
+}