fix: Show deprecation warnings only if DEV_SERVER is set

This will show warnings in bench start commands by default as this
envvar is set.

frappe/__init__.py

@@ -10,9 +10,16 @@ be used to build database driven apps.
 
 Read the documentation: https://frappeframework.com/docs
 """
+import os, warnings
+
+_dev_server = os.environ.get('DEV_SERVER', False)
+
+if _dev_server:
+	warnings.simplefilter('always', DeprecationWarning)
+	warnings.simplefilter('always', PendingDeprecationWarning)
 
 from werkzeug.local import Local, release_local
-import os, sys, importlib, inspect, json, warnings
+import sys, importlib, inspect, json
 import typing
 from past.builtins import cmp
 import click
@@ -31,8 +38,6 @@ __title__ = "Frappe Framework"
 
 local = Local()
 controllers = {}
-warnings.simplefilter('always', DeprecationWarning)
-warnings.simplefilter('always', PendingDeprecationWarning)
 
 class _dict(dict):
 	"""dict like object that exposes keys as attributes"""
@@ -197,7 +202,7 @@ def init(site, sites_path=None, new_site=False):
 	local.meta_cache = {}
 	local.form_dict = _dict()
 	local.session = _dict()
-	local.dev_server = os.environ.get('DEV_SERVER', False)
+	local.dev_server = _dev_server
 
 	setup_module_map()
 

frappe/utils/bench_helper.py

@@ -99,5 +99,6 @@ def get_apps():
 	return frappe.get_all_apps(with_internal_apps=False, sites_path='.')
 
 if __name__ == "__main__":
-	warnings.simplefilter('ignore')
+	if not frappe._dev_server:
+		warnings.simplefilter('ignore')
 	main()

frappe/utils/safe_exec.py

@@ -119,7 +119,7 @@ def get_safe_globals():
 		scrub=scrub,
 		guess_mimetype=mimetypes.guess_type,
 		html2text=html2text,
-		dev_server=1 if os.environ.get('DEV_SERVER', False) else 0,
+		dev_server=1 if frappe._dev_server else 0,
 		run_script=run_script
 	)