From 9df08455302ba4a195b479f0eed716abe0522169 Mon Sep 17 00:00:00 2001
From: utox39 <francescomoccaldi39@gmail.com>
Date: Thu, 31 Jul 2025 01:43:40 +0200
Subject: [PATCH] feat: add a utility function to retrieve the terminal size

---
 src/utils.zig | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/utils.zig

diff --git a/src/utils.zig b/src/utils.zig
new file mode 100644
index 0000000..0520d6c
--- /dev/null
+++ b/src/utils.zig
@@ -0,0 +1,51 @@
+const std = @import("std");
+const builtin = @import("builtin");
+
+pub const TermSize = struct {
+    width: u16,
+    height: u16,
+};
+
+pub fn getTerminalSize() !TermSize {
+    // https://github.com/softprops/zig-termsize (https://github.com/softprops/zig-termsize/blob/main/src/main.zig)
+
+    const stdout = std.io.getStdIn();
+
+    switch (builtin.os.tag) {
+        .windows => {
+            var buf: std.os.windows.CONSOLE_SCREEN_BUFFER_INFO = undefined;
+            switch (std.os.windows.kernel32.GetConsoleScreenBufferInfo(stdout.handle, &buf)) {
+                std.os.windows.TRUE => return TermSize{
+                    .width = @intCast(buf.srWindow.Right - buf.srWindow.Left + 1),
+                    .height = @intCast(buf.srWindow.Bottom - buf.srWindow.Top + 1),
+                },
+                else => return error.GetConsoleScreenBufferInfoFailed,
+            }
+        },
+        .linux, .macos => {
+            var buf: std.posix.winsize = undefined;
+            switch (std.posix.errno(
+                std.posix.system.ioctl(
+                    stdout.handle,
+                    std.posix.T.IOCGWINSZ,
+                    @intFromPtr(&buf),
+                ),
+            )) {
+                std.posix.E.SUCCESS => return TermSize{
+                    .width = buf.col,
+                    .height = buf.row,
+                },
+                else => return error.IoctlFailed,
+            }
+        },
+        else => return error.UnsupportedOperatingSystem,
+    }
+}
+
+test "getTerminalSize" {
+    const terminal_size = try getTerminalSize();
+
+    std.debug.print("Height: {}, Width {}\n", .{ terminal_size.height, terminal_size.width });
+
+    try std.testing.expect((terminal_size.height > 0) and (terminal_size.width > 0));
+}