From 7daf197dd602db0ced5b9d6fc16bcfa308528cac Mon Sep 17 00:00:00 2001
From: Grayden <graydenshand@gmail.com>
Date: Thu, 5 Aug 2021 15:46:09 -0400
Subject: [PATCH] Added support for a `FLASK_RUN_EXTRA_FILES` config variable.

Similar to the `flask run --extra_files=..` CLI argument or the `FLASK_RUN_EXTRA_FILES` environment variable, this is another method to specify other files to watch.
---
 docs/cli.rst     | 13 +++++++++++++
 src/flask/app.py |  1 +
 src/flask/cli.py |  5 +++++
 3 files changed, 19 insertions(+)

diff --git a/docs/cli.rst b/docs/cli.rst
index 6036cb2d..4d383fbb 100644
--- a/docs/cli.rst
+++ b/docs/cli.rst
@@ -184,12 +184,16 @@ reloader.
 Watch Extra Files with the Reloader
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+.. versionadded:: 2.1
+  Support for the ``FLASK_RUN_EXTRA_FILES`` config variable was added.
+
 When using development mode, the reloader will trigger whenever your
 Python code or imported modules change. The reloader can watch
 additional files with the ``--extra-files`` option, or the
 ``FLASK_RUN_EXTRA_FILES`` environment variable. Multiple paths are
 separated with ``:``, or ``;`` on Windows.
 
+
 .. tabs::
 
    .. group-tab:: Bash
@@ -226,6 +230,15 @@ separated with ``:``, or ``;`` on Windows.
            * Detected change in '/path/to/file1', reloading
 
 
+Alternatively, you can set the ``FLASK_RUN_EXTRA_FILES`` config
+variable, which takes a list of files::
+  from flask import Flask
+
+  app = Flask(__name__)
+  app.config['FLASK_RUN_EXTRA_FILES'] = ["file1", "dirA/file2", "dirB/"]
+
+
+
 Debug Mode
 ----------
 
diff --git a/src/flask/app.py b/src/flask/app.py
index 8c3c39d4..5dcabeb8 100644
--- a/src/flask/app.py
+++ b/src/flask/app.py
@@ -914,6 +914,7 @@ class Flask(Scaffold):
         options.setdefault("use_reloader", self.debug)
         options.setdefault("use_debugger", self.debug)
         options.setdefault("threaded", True)
+        options.setdefault("extra_files", self.config.get("FLASK_RUN_EXTRA_FILES"))
 
         cli.show_server_banner(self.env, self.debug, self.name, False)
 
diff --git a/src/flask/cli.py b/src/flask/cli.py
index d9e810da..a278bad5 100644
--- a/src/flask/cli.py
+++ b/src/flask/cli.py
@@ -841,6 +841,11 @@ def run_command(
     if debugger is None:
         debugger = debug
 
+    # Override extra_files argument with config variable if specified
+    app = info.load_app()
+    if app.config.get("FLASK_RUN_EXTRA_FILES"):
+        extra_files = app.config.get("FLASK_RUN_EXTRA_FILES")
+
     show_server_banner(get_env(), debug, info.app_import_path, eager_loading)
     app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)