refactor: move common snippet to util.go

1 files changed, 29 insertions, 0 deletions

diff --git a/cmd/util.go b/cmd/util.go
new file mode 100644
index 0000000..93199da
--- /dev/null
+++ b/cmd/util.go
@@ -0,0 +1,29 @@
+package cmd
+
+import (
+	"github.com/nsfisis/term-clock/internal/term"
+)
+
+func calcSquareSize(scr *term.Screen) (int, int, int, int) {
+	// Calculate square width/height and offset.
+	scrW, scrH := scr.Size()
+	//         17
+	// <--------------->
+	// ### ###   ### ### ^
+	// # # # # # # # # # |
+	// # # # #   # # # # | 5
+	// # # # # # # # # # |
+	// ### ###   ### ### v
+	squareW := scrW / (17 + 2)
+	squareH := scrH / (5 + 2)
+	if squareH > squareW {
+		squareH = squareW
+	}
+	if squareW > squareH*3/2 {
+		squareW = squareH * 3 / 2
+	}
+	xOffset := (scrW - squareW*17) / 2
+	yOffset := (scrH - squareH*5) / 2
+
+	return squareW, squareH, xOffset, yOffset
+}