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display.go
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display.go
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package main
import (
"bytes"
"fmt"
"os"
"os/exec"
"os/signal"
"syscall"
)
func initialize() (rows int, columns int) {
var output bytes.Buffer
cmd := exec.Command("stty", "cbreak", "-echo", "size")
cmd.Stdout = &output
cmd.Stdin = os.Stdin
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
panic(err)
}
_, err = fmt.Sscanf(output.String(), "%d %d", &rows, &columns)
if err != nil {
panic(fmt.Errorf("Unable to read screen size: %s", err))
}
return
}
func cleanup() {
showCursor()
cmd := exec.Command("stty", "-cbreak", "echo")
cmd.Stdin = os.Stdin
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
panic(err)
}
}
func clear() {
fmt.Print("\x1b[2J")
}
func move(x, y int) {
fmt.Printf("\x1b[%d;%df", x+1, y+1)
}
func resize() (rows int, columns int) {
var output bytes.Buffer
cmd := exec.Command("stty", "size")
cmd.Stdout = &output
cmd.Stdin = os.Stdin
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
panic(err)
}
_, err = fmt.Sscanf(output.String(), "%d %d", &rows, &columns)
if err != nil {
panic(fmt.Errorf("Unable to read screen size: %s", err))
}
return
}
func hideCursor() {
fmt.Print("\x1b[?25l")
}
func showCursor() {
fmt.Print("\x1b[?25h")
}
func interruptHandling(endrow, endcol int) {
c := make(chan os.Signal)
go func() {
<-c
move(endrow, endcol)
cleanup()
os.Exit(0)
}()
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
}