lint: Replace isort with Ruff.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

packaged_helloworld/packaged_helloworld/packaged_helloworld.py

@@ -2,7 +2,6 @@
 from typing import Any, Dict
 
 import packaged_helloworld
-
 from zulip_bots.lib import BotHandler
 
 __version__ = packaged_helloworld.__version__

pyproject.toml

@@ -93,7 +93,21 @@ pythonpath = [
 ]
 
 [tool.ruff]
+select = [
+    "E", # style errors
+    "F", # flakes
+    "I", # import sorting
+]
 ignore = [
     "E402", # Module level import not at top of file
+    "E501", # Line too long
     "E731", # Do not assign a `lambda` expression, use a `def`
 ]
+src = [
+    "tools",
+    "zulip",
+    "zulip/integrations/zephyr",
+    "zulip_bots",
+    "zulip_botserver",
+]
+line-length = 100

requirements.txt

@@ -1,7 +1,6 @@
 crayons
 twine
 black~=23.10.1
-isort
 mock
 pytest
 pytest-cov

tools/lint

@@ -38,13 +38,6 @@ def run() -> None:
     linter_config.external_linter(
         "gitlint", ["tools/lint-commits"], description="Git Lint for commit messages"
     )
-    linter_config.external_linter(
-        "isort",
-        ["isort"],
-        ["py"],
-        description="Sorts Python import statements",
-        check_arg=["--check-only", "--diff"],
-    )
     linter_config.external_linter(
         "black",
         ["black"],