create phplint-problem-matcher

.github/workflows/lint.yml

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+name: Test
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+    - name: Set up php${{ matrix.php-versions }}
+      uses: shivammathur/setup-php@v1
+    - name: add problem matcher for php lint
+      run: ./index.js
+    - name: lint PHP file with syntax error
+      run: php -l test/error.php || true
+

README.md

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+# phplint-problem-matcher
+
+This problem matcher lets you show errors from `php -l` as annotation in GitHub Actions.
+
+## Usage
+
+Add the step to your workflow, before `php -l` is called.
+
+```yaml
+    - uses: korelstar/phplint-problem-matcher@v1
+```

action.yml

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+name: 'phplint problem matcher'
+author: 'Kristof Hamann'
+description: 'Shows php lint errors as annotation (with file and code line) in GitHub Actions'
+runs:
+  using: 'node12'
+  main: 'index.js'
+branding:
+  icon: 'check-square'
+  color: 'green'

index.js

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+#!/usr/bin/env node
+console.log(`::add-matcher::${__dirname}/phplint-matcher.json`);

phplint-matcher.json

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+{
+	"problemMatcher": [
+		{
+			"owner": "phplint-matcher",
+			"pattern": [
+				{
+					"regexp": "^(.+):\\s+\\s+(.+) in (.+) on line (\\d+)$",
+					"code": 1,
+					"message": 2,
+					"file": 3,
+					"line": 4
+				}
+			]
+		}
+	]
+}

test/error.php

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+<?php
+
+echo "syntax error"