feat: add file watching module

Author: nooneknowspeter

src/file_watcher.zig

@@ -0,0 +1,28 @@
+const STD = @import("std");
+
+const WATCH_POLLING_RATE_MS: u64 = 500;
+
+pub const FileWatcher = struct {
+    const Self = @This();
+
+    current_file_path: []const u8 = "",
+    previous_mod_time: i128 = 0,
+
+    pub fn init(file_path: []const u8) Self {
+        return Self{
+            .current_file_path = file_path,
+        };
+    }
+
+    pub fn checkForChanges(self: *Self) !bool {
+        const metadata = try STD.fs.cwd().statFile(self.current_file_path);
+        const current_mod_time = metadata.mtime;
+
+        if (current_mod_time != self.previous_mod_time) {
+            self.previous_mod_time = current_mod_time;
+            return true;
+        }
+
+        return false;
+    }
+};