Add checks for titles & descriptions of PRs

.github/workflows/pr-text-checker.yaml

@@ -0,0 +1,116 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+# Check the subject and description of each PR for basic best practices and
+# fail with an error if a PR doesn't meet the conditions.
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+name: 'Pull request text checker'
+run-name: >-
+  Check text of PR
+  #${{github.event.inputs.pr-number || github.event.pull_request.number}}
+  by ${{github.actor}}
+
+on:
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+    branches:
+      - main
+      - master
+
+  # Allow manual invocation.
+  workflow_dispatch:
+    inputs:
+      pr-number:
+        description: 'The PR number of the PR to check:'
+        type: string
+        required: true
+      debug:
+        description: 'Run with debugging options'
+        type: boolean
+        default: true
+
+# Declare default workflow permissions as read only.
+permissions: read-all
+
+concurrency:
+  # Cancel any previously-started but still active runs on the same branch.
+  cancel-in-progress: true
+  group: ${{github.workflow}}-${{github.event.pull_request.number||github.ref}}
+
+jobs:
+  check-pr-text:
+    if: github.repository_owner == 'quantumlib'
+    name: Check PR text
+    runs-on: ubuntu-24.04
+    timeout-minutes: 5
+    env:
+      GH_TOKEN: ${{github.token}}
+      PR_NUMBER: ${{inputs.pr-number || github.event.pull_request.number}}
+      # The next var is used by Bash. We add 'xtrace' to the options if this run
+      # is a workflow_dispatch invocation and the user set the 'debug' option.
+      SHELLOPTS: ${{inputs.debug && 'xtrace' || '' }}
+    steps:
+      # Note that this workflow does not need to check out the git repo because
+      # it does not need to read any files in the repo.
+
+      - name: Check title and description
+        run: |
+          declare -i exit_code=0
+          declare success=":white_check_mark:"
+          declare failure=":x:"
+
+          check() {
+            local condition="$1"
+            local message="$2"
+            local result=""
+
+            eval "$condition" && result="$success" || result="$failure"
+            echo "| $message | $result |" >> "$GITHUB_STEP_SUMMARY"
+            if [[ "$result" == "$failure" ]]; then
+              exit_code=1
+            fi
+          }
+
+          data=$(gh pr view -R ${{github.repository}} "$PR_NUMBER" --json title,body)
+          title=$(jq -r .title <<< "$data")
+          body=$(jq -r .body <<< "$data")
+
+          {
+          echo "## Results of checking pull request #$PR_NUMBER"
+          echo ""
+          echo "| Check | Result |"
+          echo "|-------|:------:|"
+          } >> "$GITHUB_STEP_SUMMARY"
+
+          check "[[ $(echo "$title" | wc -w) -ge 1 ]]" "Title contains at least one word"
+          check "[[ ${#title} -ge 6 ]]" "Title is at least 6 characters long"
+          check "[[ -n \"$body\" && \"$body\" != \"null\" ]]" "Description is not empty"
+
+          echo "" >> "$GITHUB_STEP_SUMMARY"
+          if (( exit_code == 0 )); then
+            echo "All checks passed." >> "$GITHUB_STEP_SUMMARY"
+          else
+            echo '::error::Failed checks. Please check the workflow summary page.'
+            {
+            echo "Checks failed."
+            echo "Please make appropriate corrections to this PR."
+            } >> "$GITHUB_STEP_SUMMARY"
+          fi
+          # shellcheck disable=2086
+          exit $exit_code