Add test and default value for P escape

escape.go

@@ -1,6 +1,7 @@
 package terminal
 
 import (
+ "fmt"
  "log"
  "strconv"
  "strings"
@@ -130,6 +131,9 @@ func escapeColorMode(t *Terminal, msg string) {
 
 func escapeDeleteChars(t *Terminal, msg string) {
  i, _ := strconv.Atoi(msg)
+ if i == 0 {
+ i = 1
+ }
  right := t.cursorCol + i
 
  row := t.content.Row(t.cursorRow)
@@ -139,6 +143,7 @@ func escapeDeleteChars(t *Terminal, msg string) {
  }
 
  t.content.SetRow(t.cursorRow, widget.TextGridRow{Cells: cells})
+ fmt.Println(t.content.Text())
 }
 
 func escapeEraseInLine(t *Terminal, msg string) {

escape_test.go

@@ -18,6 +18,20 @@ func TestClearScreen(t *testing.T) {
  assert.Equal(t, "", term.content.Text())
 }
 
+func TestInsertDeleteChars(t *testing.T) {
+ term := New()
+ term.config.Columns = 5
+ term.config.Rows = 2
+ term.handleOutput([]byte("Hello"))
+ assert.Equal(t, "Hello", term.content.Text())
+
+ term.moveCursor(0, 2)
+ term.handleEscape("2@")
+ assert.Equal(t, "He llo", term.content.Text())
+ term.handleEscape("3P")
+ assert.Equal(t, "Helo", term.content.Text())
+}
+
 func TestEraseLine(t *testing.T) {
  term := New()
  term.config.Columns = 5