Use $HOME/Library/Caches on macOS instead of $HOME/.cache

src/os/xdg.zig

@@ -30,6 +30,22 @@ pub fn config(alloc: Allocator, opts: Options) ![]u8 {
 
 /// Get the XDG cache directory. The returned value is allocated.
 pub fn cache(alloc: Allocator, opts: Options) ![]u8 {
+    // On macOS we should use ~/Library/Caches instead of ~/.cache
+    if (builtin.os.tag == .macos) {
+        // Get our home dir if not provided
+        const home = if (opts.home) |h| h else blk: {
+            var buf: [1024]u8 = undefined;
+            break :blk try homedir.home(&buf) orelse return error.NoHomeDir;
+        };
+
+        return try std.fs.path.join(alloc, &[_][]const u8{
+            home,
+            "Library",
+            "Caches",
+            opts.subdir orelse "",
+        });
+    }
+
     return try dir(alloc, opts, .{
         .env = "XDG_CACHE_HOME",
         .windows_env = "LOCALAPPDATA",
@@ -143,6 +159,52 @@ test {
     }
 }
 
+test "cache directory paths" {
+    const testing = std.testing;
+    const alloc = testing.allocator;
+    const mock_home = "/Users/test";
+
+    // Test macOS path
+    if (builtin.os.tag == .macos) {
+        // Test base path
+        {
+            const cache_path = try cache(alloc, .{ .home = mock_home });
+            defer alloc.free(cache_path);
+            try testing.expectEqualStrings("/Users/test/Library/Caches", cache_path);
+        }
+
+        // Test with subdir
+        {
+            const cache_path = try cache(alloc, .{
+                .home = mock_home,
+                .subdir = "ghostty",
+            });
+            defer alloc.free(cache_path);
+            try testing.expectEqualStrings("/Users/test/Library/Caches/ghostty", cache_path);
+        }
+    }
+
+    // Test Linux path (when XDG_CACHE_HOME is not set)
+    if (builtin.os.tag == .linux) {
+        // Test base path
+        {
+            const cache_path = try cache(alloc, .{ .home = mock_home });
+            defer alloc.free(cache_path);
+            try testing.expectEqualStrings("/Users/test/.cache", cache_path);
+        }
+
+        // Test with subdir
+        {
+            const cache_path = try cache(alloc, .{
+                .home = mock_home,
+                .subdir = "ghostty",
+            });
+            defer alloc.free(cache_path);
+            try testing.expectEqualStrings("/Users/test/.cache/ghostty", cache_path);
+        }
+    }
+}
+
 test parseTerminalExec {
     const testing = std.testing;