restore terminal state when loading term view

pkg/blockcontroller/blockcontroller.go

@@ -4,6 +4,7 @@
 package blockcontroller
 
 import (
+	"bytes"
 	"context"
 	"encoding/base64"
 	"encoding/json"
@@ -108,6 +109,21 @@ func (bc *BlockController) handleShellProcData(data []byte, seqNum int) error {
 	return nil
 }
 
+func (bc *BlockController) resetTerminalState() {
+	ctx, cancelFn := context.WithTimeout(context.Background(), DefaultTimeout)
+	defer cancelFn()
+	var buf bytes.Buffer
+	// buf.WriteString("\x1b[?1049l") // disable alternative buffer
+	buf.WriteString("\x1b[0m")     // reset attributes
+	buf.WriteString("\x1b[?25h")   // show cursor
+	buf.WriteString("\x1b[?1000l") // disable mouse tracking
+	buf.WriteString("\r\n\r\n(restored terminal state)\r\n\r\n")
+	err := blockstore.GBS.AppendData(ctx, bc.BlockId, "main", buf.Bytes())
+	if err != nil {
+		log.Printf("error appending to blockfile (terminal reset): %v\n", err)
+	}
+}
+
 func (bc *BlockController) DoRunShellCommand(rc *RunShellOpts) error {
 	// create a circular blockfile for the output
 	ctx, cancelFn := context.WithTimeout(context.Background(), 2*time.Second)
@@ -116,6 +132,10 @@ func (bc *BlockController) DoRunShellCommand(rc *RunShellOpts) error {
 	if err != nil && err != blockstore.ErrAlreadyExists {
 		return fmt.Errorf("error creating blockfile: %w", err)
 	}
+	if err == blockstore.ErrAlreadyExists {
+		// reset the terminal state
+		bc.resetTerminalState()
+	}
 	if bc.getShellProc() != nil {
 		return nil
 	}