refactor: add file watcher to project_manager and watch project

src/project_manager.zig

@@ -3,6 +3,7 @@ const tp = @import("thespian");
 const cbor = @import("cbor");
 const log = @import("log");
 const tracy = @import("tracy");
+const file_watcher = @import("file_watcher");
 const file_type_config = @import("file_type_config");
 const lsp_config = @import("lsp_config");
 const root = @import("soft_root").root;
@@ -520,6 +521,7 @@ const Process = struct {
             self.logger.print("{s} error: {s}", .{ tag, message });
         } else if (try cbor.match(m.buf, .{"shutdown"})) {
             self.persist_projects();
+            file_watcher.shutdown();
             from.send(.{ "project_manager", "shutdown" }) catch return error.ClientFailed;
             return error.ExitNormal;
         } else if (try cbor.match(m.buf, .{ "exit", "normal" })) {
@@ -548,6 +550,7 @@ const Process = struct {
             try self.projects.put(self.allocator, try self.allocator.dupe(u8, project_directory), project);
             self.restore_project(project) catch |e| self.logger.err("restore_project", e);
             project.query_git();
+            file_watcher.watch(project_directory) catch |e| self.logger.err("file_watcher.watch", e);
         }
     }
 
@@ -558,6 +561,7 @@ const Process = struct {
             kv.value.deinit();
             self.allocator.destroy(kv.value);
             self.logger.print("closed: {s}", .{project_directory});
+            file_watcher.unwatch(project_directory) catch |e| self.logger.err("file_watcher.unwatch", e);
         }
     }