Task

Demonstrate how to achieve movement of the terminal cursor:

 how to move the cursor one position to the left
 how to move the cursor one position to the right
 how to move the cursor up one line (without affecting its horizontal position)
 how to move the cursor down one line (without affecting its horizontal position)
 how to move the cursor to the beginning of the line
 how to move the cursor to the end of the line
 how to move the cursor to the top left corner of the screen
 how to move the cursor to the bottom right corner of the screen


For the purpose of this task, it is not permitted to overwrite any characters or attributes on any part of the screen (so outputting a space is not a suitable solution to achieve a movement to the right).



Handling of out of bounds locomotion
This task has no specific requirements to trap or correct cursor movement beyond the terminal boundaries, so the implementer should decide what behavior fits best in terms of the chosen language.   Explanatory notes may be added to clarify how an out of bounds action would behave and the generation of error messages relating to an out of bounds cursor position is permitted.




package main
 
import (
    "fmt"
    "time"
    "os"
    "os/exec"
    "strconv"
)
 
func main() {
    tput("clear") // clear screen
    tput("cup", "6", "3") // an initial position
    time.Sleep(1 * time.Second)
    tput("cub1") // left
    time.Sleep(1 * time.Second)
    tput("cuf1") // right
    time.Sleep(1 * time.Second)
    tput("cuu1") // up
    time.Sleep(1 * time.Second)
    // cud1 seems broken for me.  cud 1 works fine though.
    tput("cud", "1") // down
    time.Sleep(1 * time.Second)
    tput("cr") // begining of line
    time.Sleep(1 * time.Second)
    // get screen size here
    var h, w int
    cmd := exec.Command("stty", "size")
    cmd.Stdin = os.Stdin
    d, _ := cmd.Output()
    fmt.Sscan(string(d), &h, &w)
    // end of line
    tput("hpa", strconv.Itoa(w-1))
    time.Sleep(2 * time.Second)
    // top left
    tput("home")
    time.Sleep(2 * time.Second)
    // bottom right
    tput("cup", strconv.Itoa(h-1), strconv.Itoa(w-1))
    time.Sleep(3 * time.Second)
}
 
func tput(args ...string) error {
    cmd := exec.Command("tput", args...)
    cmd.Stdout = os.Stdout
    return cmd.Run()
}