Add terminal size lookup

internal/editor/editor.go

@@ -8,6 +8,11 @@ import (
 	"timshome.page/gilo/internal/terminal"
 )
 
+type Editor struct {
+	rows int
+	cols int
+}
+
 var reader = bufio.NewReader(os.Stdin)
 
 func readKey() (rune, int) {

internal/terminal/terminal.go

@@ -41,6 +41,16 @@ func ANSICode (code string) {
 	fmt.Printf("\x1b[%s", code)
 }
 
+func Size () (width int, height int) {
+	width, height, err := term.GetSize(int(os.Stdin.Fd()))
+	if err != nil {
+		width = 80
+		height = 24
+	}
+
+	return width, height
+}
+
 // Print a formatted string to stdout, with CRLF line endings for proper terminal formatting
 func OutLn(format string, a ...interface{}) {
 	formatted := fmt.Sprintf(format, a...)