Make lint script return non-zero upon any change

So that the CI fails when reformatting needed to occur.

Author: ctrueden

bin/lint.sh

@@ -4,10 +4,19 @@ dir=$(dirname "$0")
 cd "$dir/.."
 
 exitCode=0
+
+# Check for errors and capture non-zero exit codes.
 uv run validate-pyproject pyproject.toml
 code=$?; test $code -eq 0 || exitCode=$code
+uv run ruff check >/dev/null 2>&1
+code=$?; test $code -eq 0 || exitCode=$code
+uv run ruff format --check >/dev/null 2>&1
+code=$?; test $code -eq 0 || exitCode=$code
+
+# Do actual code reformatting.
 uv run ruff check --fix
 code=$?; test $code -eq 0 || exitCode=$code
 uv run ruff format
 code=$?; test $code -eq 0 || exitCode=$code
+
 exit $exitCode

pyproject.toml

@@ -47,7 +47,7 @@ dev = [
     "pandas",
     "ruff",
     "toml",
-    "validate-pyproject[all]"
+    "validate-pyproject[all]",
 ]
 
 [project.urls]
@@ -65,7 +65,6 @@ include-package-data = false
 where = ["src"]
 namespaces = false
 
-# ruff configuration
 [tool.ruff]
 line-length = 88
 src = ["src", "tests"]