ci: add darglint to ci

.github/workflows/ci.yml

@@ -69,6 +69,23 @@ jobs:
           # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
           flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --exclude .git,__pycache__,docs/source/conf.py,old,build,dist,tests/,jina/hub/
 
+  check-docstring:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Python 3.7
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
+      - id: file_changes
+        uses: jitterbit/get-changed-files@v1
+      - name: docstring check with darglint and pydocstyle
+        run: ./scripts/docstrings_lint.sh
+        env:
+          CHANGED_FILES: ${{ steps.file_changes.outputs.all }}
+
   prep-testbed:
     runs-on: ubuntu-18.04
     steps:

scripts/docstrings_lint.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# required in order to get the status of all the files at once
+pip install darglint==1.6.0
+pip install pydocstyle==5.1.1
+echo ====================================================================================
+echo DOCSTRINGS LINT: checking $CHANGED_FILES
+echo ------------------------------------------------------------------------------------
+echo 'removing files under /tests...'
+arrVar=()
+# we ignore tests files
+for changed_file in $CHANGED_FILES; do
+  if [[ ${changed_file}} != tests/* ]]; then
+    echo keeping ${changed_file}
+    arrVar+=(${changed_file})
+  fi
+done
+DARGLINT_OUTPUT=$(darglint -v 2 -s sphinx "${arrVar[@]}"); PYDOCSTYLE_OUTPUT=$(pydocstyle --select=D101,D102,D103 "${arrVar[@]}")
+# status captured here
+if [[ -z "$PYDOCSTYLE_OUTPUT" ]] && [[ -z "$DARGLINT_OUTPUT" ]]; then
+  echo 'OK'
+  exit 0
+else
+  echo 'failure'
+  echo $DARGLINT_OUTPUT
+  echo $PYDOCSTYLE_OUTPUT
+  exit 1
+fi
+echo ====================================================================================