gilo/terminal/size.go

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package terminal
import (
"fmt"
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"golang.org/x/term"
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"os"
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)
type Screen struct {
Rows int
Cols int
}
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// Get the size of the terminal in rows and columns
func Size () *Screen {
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check()
cols := 80
rows := 24
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// Try the syscall first
cols, rows, err := term.GetSize(int(os.Stdin.Fd()))
if err == nil {
return &Screen {rows, cols }
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}
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// Figure out the size the hard way
rows, cols = sizeTrick()
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return &Screen{ rows, cols }
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}
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func sizeTrick () (rows int, cols int) {
// Move cursor to location further than likely screen size
// The cursor will move to maximum available position
fmt.Print("\x1b[999C\x1b[99B")
// Ask the terminal where the cursor is
fmt.Print("\x1b[6n")
// 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
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}