feat(macos): add disk info

src/macos/macos.zig

@@ -5,6 +5,7 @@ const c_sysctl = @cImport(@cInclude("sys/sysctl.h"));
 const c_iokit = @cImport(@cInclude("IOKit/IOKitLib.h"));
 const c_core_foundation = @cImport(@cInclude("CoreFoundation/CoreFoundation.h"));
 const c_mach = @cImport(@cInclude("mach/mach.h"));
+const c_statvfs = @cImport(@cInclude("sys/statvfs.h"));
 
 /// Structure representing system uptime in days, hours, and minutes.
 pub const SystemUptime = struct {
@@ -29,6 +30,13 @@ pub const RamInfo = struct {
     ram_usage_percentage: u8,
 };
 
+pub const DiskInfo = struct {
+    disk_path: []const u8,
+    disk_size: f64,
+    disk_usage: f64,
+    disk_usage_percentage: u8,
+};
+
 /// Returns the current logged-in uesr's username.
 /// Uses the environment variable `USER`.
 /// The caller is responsible for freeing the allocated memory.
@@ -256,3 +264,23 @@ pub fn getRamInfo() !RamInfo {
 
     return ram_info;
 }
+
+pub fn getDiskSize(disk_path: []const u8) !DiskInfo {
+    var stat: c_statvfs.struct_statvfs = undefined;
+    if (c_statvfs.statvfs(disk_path.ptr, &stat) != 0) {
+        return error.StatvfsFailed;
+    }
+
+    const total_size = stat.f_blocks * stat.f_frsize;
+    const free_size = stat.f_bavail * stat.f_frsize;
+    const used_size = total_size - free_size;
+
+    const used_size_percentage = (used_size * 100) / total_size;
+
+    return DiskInfo{
+        .disk_path = disk_path,
+        .disk_size = @as(f64, @floatFromInt(total_size)) / 1e9,
+        .disk_usage = @as(f64, @floatFromInt(used_size)) / 1e9,
+        .disk_usage_percentage = @as(u8, @intCast(used_size_percentage)),
+    };
+}