Swap a running app's module: --watch and the swap command

vega tui|web MODULE --watch replaces the running app's module when its
file is written again (aup watch writes it); states keep their values by
name through pure_app_replace and every web page hears of it. The file is
compared by the digest of its bytes, at most five times a second, so a
module of the same size written within the same second is not missed; a
module that does not load leaves the app as it was and is not tried
again. Modules alternate between two slots so a failed load never touches
the running one. Scripts get swap MODULE; whether a module runs frames is
now a property of the screen.

1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index ce490dd..6c89767 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,8 @@ build/vega tui todo.pmod --store ~/.todo      # 터미널. 글자 입력 후 Ent
                                               # --store가 있으면 목록이 다음 실행에도 남는다(어느 표면이든)
 printf 'text 6d696c6b\nkey Space\nshow\n' | build/vega cli todo.pmod
 printf 'text 6d696c6b\nkey Space\nshow\n' | build/vega say todo.pmod
+build/vega web todo.pmod --watch              # 브라우저(GUI). --watch: 모듈이 다시 빌드되면 상태를 이어 바꾼다
+                                              # (옆에서 AUP_PATH=lib aup watch examples/todo.aup -o todo.pmod)
 make check                                    # 참조 모델 대조, 프레임 검사, 대화형 pty 검사, 견고성
 ```