Add Flake8 problem matcher

Author: tetienne

.github/workflows/build.yaml

@@ -28,6 +28,11 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
+    - name: Register problems matchers
+      run: |
+        echo "::add-matcher::.github/workflows/matchers/flake8.json"
+        echo "::add-matcher::.github/workflows/matchers/python.json"
+
     - name: Install tox
       run: pip install tox
 

.github/workflows/matchers/flake8.json

@@ -0,0 +1,30 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "flake8-error",
+      "severity": "error",
+      "pattern": [
+        {
+          "regexp": "^(.*):(\\d+):(\\d+):\\s([EF]\\d{3}\\s.*)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4
+        }
+      ]
+    },
+    {
+      "owner": "flake8-warning",
+      "severity": "warning",
+      "pattern": [
+        {
+          "regexp": "^(.*):(\\d+):(\\d+):\\s([CDNW]\\d{3}\\s.*)$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4
+        }
+      ]
+    }
+  ]
+}

.github/workflows/matchers/python.json

@@ -0,0 +1,18 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "python",
+      "pattern": [
+        {
+          "regexp": "^\\s*File\\s\\\"(.*)\\\",\\sline\\s(\\d+),\\sin\\s(.*)$",
+          "file": 1,
+          "line": 2
+        },
+        {
+          "regexp": "^\\s*raise\\s(.*)\\(\\'(.*)\\'\\)$",
+          "message": 2
+        }
+      ]
+    }
+  ]
+}