Step by Step solution about How to resolve the algorithm Terminal control/Preserve screen step by step in the Go programming language

This code demonstrates the use of alternate screen buffers in Go, providing a full-screen text-based interface. Let's break down the code step by step:

1. Package Import: The code starts by importing the necessary package:

   • "fmt" for input/output operations
   • "time" for sleep functionality

2. Main Function: The main function is the entry point of the program.

3. Entering Alternate Screen Buffer:

   • fmt.Print("\033[?1049h\033[H"): This line enters the alternate screen buffer. The escape sequence \033[?1049h tells the terminal to enter the alternate screen buffer, and \033[H moves the cursor to the home position at the top left of the screen.

4. Displaying a Message:

   • fmt.Println("Alternate screen buffer\n"): This line prints the message "Alternate screen buffer" followed by a newline to the alternate screen buffer.

5. Countdown Loop:

   • for i := 5; i > 0; i--: This loop starts with i set to 5 and decrements it until it reaches 0.
   • if i == 1: This conditional checks if i is equal to 1. If it is, it changes the suffix s to an empty string so that the grammar is correct in the countdown message.
   • fmt.Printf("\rgoing back in %d second%s...", i, s): This line prints a message to the alternate screen buffer, replacing the previous line with the updated countdown. The \r escape sequence moves the cursor to the beginning of the current line, allowing the countdown to be updated in place.
   • time.Sleep(time.Second): This line pauses the program for one second.

6. Exiting Alternate Screen Buffer:

   • fmt.Print("\033[?1049l"): This line exits the alternate screen buffer and returns to the normal terminal screen. The escape sequence \033[?1049l tells the terminal to leave the alternate screen buffer.

In summary, this code uses alternate screen buffers to provide a full-screen user interface for a simple countdown. It demonstrates how to enter the alternate screen buffer, display text, and exit the alternate screen buffer in Go.

package main

import (
    "fmt"
    "time"
)

func main() {
    fmt.Print("\033[?1049h\033[H")
    fmt.Println("Alternate screen buffer\n")
    s := "s"
    for i := 5; i > 0; i-- {
        if i == 1 {
            s = ""
        }
        fmt.Printf("\rgoing back in %d second%s...", i, s)
        time.Sleep(time.Second)
    }
    fmt.Print("\033[?1049l")
}