gilo/terminal/size.go

62 lines
1.1 KiB
Go
Raw Normal View History

2021-03-19 16:36:02 -04:00
package terminal
import (
"fmt"
2021-03-19 17:08:19 -04:00
"golang.org/x/term"
2021-03-24 16:23:17 -04:00
"os"
2021-03-19 16:36:02 -04:00
)
type Screen struct {
Rows int
Cols int
}
2021-03-24 16:23:17 -04:00
// Get the size of the terminal in rows and columns
func Size () *Screen {
cols := 80
rows := 24
2021-03-24 16:23:17 -04:00
// Try the syscall first
cols, rows, err := term.GetSize(int(os.Stdin.Fd()))
if err == nil {
return &Screen {rows, cols }
2021-03-19 16:36:02 -04:00
}
2021-03-24 16:23:17 -04:00
// Figure out the size the hard way
2021-03-31 19:17:04 -04:00
if term.IsTerminal(int(os.Stdin.Fd())) {
rows, cols = sizeTrick()
}
2021-03-19 16:36:02 -04:00
return &Screen{ rows, cols }
2021-03-19 16:36:02 -04:00
}
2021-03-24 13:24:40 -04:00
func sizeTrick () (rows int, cols int) {
// Move cursor to location further than likely screen size
// The cursor will move to maximum available position
2021-03-26 12:01:17 -04:00
fmt.Print(Code("999C") + Code("999B"))
2021-03-24 13:24:40 -04:00
// Ask the terminal where the cursor is
2021-03-26 12:01:17 -04:00
fmt.Print(LocateCursor)
2021-03-24 13:24:40 -04:00
// Read stdin looking for the reported location
buffer := ""
for char, _ := ReadKey(); char != 'R'; char, _ = ReadKey() {
if char == '\x1b' || char == '[' {
continue
}
if char == 'R' || char == '\x00'{
break
}
buffer += string(char)
}
_, err := fmt.Sscanf(buffer, "%d;%d", &rows, &cols)
if err != nil {
panic(err)
}
return rows, cols
2021-03-24 16:23:17 -04:00
}