Add problem matchers

.github/problem-matchers/README.md

@@ -0,0 +1,25 @@
+# Problem Matchers
+
+GitHub [Problem
+Matchers](https://github.com/actions/toolkit/blob/main/docs/problem-matchers.md)
+are a mechanism that enable workflow steps to scan the outputs of GitHub
+Actions for regex patterns and automatically write annotations in the workflow
+summary page. Using Problem Matchers allows information to be displayed more
+prominently in the GitHub user interface.
+
+This directory contains Problem Matchers used by the GitHub Actions workflows
+in the [`workflows`](./workflows) subdirectory.
+
+The following problem matcher JSON file for Pylint was copied from the [Home
+Assistant](https://github.com/home-assistant/core) project on GitHub. The Home
+Assistant project is licensed under the Apache 2.0 open-source license. The
+versions of the file at the time it was copied was 2025.1.2.
+
+- [`pylint.json`](https://github.com/home-assistant/core/blob/dev/.github/workflows/matchers/pylint.json)
+
+The following problem matcher for Black came from a fork of the
+[MLflow](https://github.com/mlflow/mlflow) project by user Sumanth077 on
+GitHub. The MLflow project is licensed under the Apache 2.0 open-source
+license. The version of the file copied was dated 2022-05-29.
+
+- [`black.json`](https://github.com/Sumanth077/mlflow/blob/problem-matcher-for-black/.github/workflows/matchers/black.json)

.github/problem-matchers/black.json

@@ -0,0 +1,15 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "black",
+      "severity": "error",
+      "pattern": [
+        {
+          "regexp": "^(would reformat) (.+)$",
+          "file": 2,
+          "message": 1
+        }
+      ]
+    }
+  ]
+}

.github/problem-matchers/pylint.json

@@ -0,0 +1,32 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "pylint-error",
+      "severity": "error",
+      "pattern": [
+        {
+          "regexp": "^(.+):(\\d+):(\\d+):\\s(([EF]\\d{4}):\\s.+)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4,
+          "code": 5
+        }
+      ]
+    },
+    {
+      "owner": "pylint-warning",
+      "severity": "warning",
+      "pattern": [
+        {
+          "regexp": "^(.+):(\\d+):(\\d+):\\s(([CRW]\\d{4}):\\s.+)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4,
+          "code": 5
+        }
+      ]
+    }
+  ]
+}

.github/workflows/black.yml

@@ -12,6 +12,8 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - name: Set up problem matcher for Black output
+        run: echo '::add-matcher::.github/problem-matchers/black.json'
       - uses: psf/black@8a737e727ac5ab2f1d4cf5876720ed276dc8dc4b # stable
         with:
           src: "./unitary"

.github/workflows/pylint.yml

@@ -19,5 +19,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install pylint
+      - name: Set up problem matcher for Pylint output
+        run: echo '::add-matcher::.github/problem-matchers/pylint.json'
       - name: Pylint check
         run: dev_tools/pylint