Only apply isort to known source files/dirs

For example, if you would create a virtual environment in the subfolder
venv, isort will check all of the installed packages in that venv.

This also fixes a small bug where the ">=5" at the end of the pip
install command for isort would be interpreted as a redirect, creating a
file "=5" with the output from pip.

Author: VincentVanlaer

ci.sh

@@ -2,6 +2,7 @@
 
 set -ex
 
+CHECK_FILES="setup.py src tests"
 YAPF_VERSION=0.20.1
 
 pip install -U pip setuptools wheel
@@ -10,16 +11,16 @@ python setup.py sdist --formats=zip
 pip install dist/*.zip
 
 if [ "$CHECK_FORMATTING" = "1" ]; then
-    pip install yapf==${YAPF_VERSION} isort>=5
-    if ! yapf -rpd setup.py src tests; then
+    pip install yapf==${YAPF_VERSION} "isort>=5"
+    if ! yapf -rpd $CHECK_FILES; then
         cat <<EOF
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
 Formatting problems were found (listed above). To fix them, run
 
    pip install yapf==${YAPF_VERSION}
-   yapf -rpi setup.py src tests
+   yapf -rpi $CHECK_FILES
 
 in your local checkout.
 
@@ -32,15 +33,15 @@ EOF
     # required for isort to order test imports correctly
     pip install -Ur test-requirements.txt
 
-    if ! isort --check-only --diff . ; then
+    if ! isort --check-only --diff $CHECK_FILES ; then
         cat <<EOF
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
 Formatting problems were found (listed above). To fix them, run
 
    pip install isort
-   isort .
+   isort $CHECK_FILES
 
 in your local checkout.