feat(rule): infra-change detection (closes #15)

__tests__/infrastructure/infra-change.test.js

@@ -0,0 +1,79 @@
+const rule = require('../../src/rules/infrastructure/infra-change');
+
+describe('Infra Change Rule', () => {
+  it('labels for terraform files', () => {
+    const files = [{ filename: 'infra/main.tf' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('infra-change');
+  });
+
+  it('labels for terraform variables', () => {
+    const files = [{ filename: 'terraform/vars.tfvars' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('infra-change');
+  });
+
+  it('labels for HCL files', () => {
+    const files = [{ filename: 'config/setup.hcl' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('infra-change');
+  });
+
+  it('labels for docker-compose', () => {
+    const files = [{ filename: 'docker-compose.yml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('infra-change');
+  });
+
+  it('labels for Dockerfile', () => {
+    const files = [{ filename: 'services/Dockerfile' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('infra-change');
+  });
+
+  it('labels for infra directory', () => {
+    const files = [{ filename: 'infrastructure/setup.yaml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('infra-change');
+  });
+
+  it('labels for k8s directory', () => {
+    const files = [{ filename: 'k8s/deployment.yaml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('infra-change');
+  });
+
+  it('labels for helm charts', () => {
+    const files = [{ filename: 'charts/app/values.yaml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('infra-change');
+  });
+
+  it('labels for config directory', () => {
+    const files = [{ filename: 'config/production.yml' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toContain('infra-change');
+  });
+
+  it('does not label for app code', () => {
+    const files = [{ filename: 'src/app.js' }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toEqual([]);
+  });
+
+  it('handles empty files array', () => {
+    const labels = rule({ files: [], pr: {}, enableDebug: false });
+    expect(labels).toEqual([]);
+  });
+
+  it('handles null filename', () => {
+    const files = [{ filename: null }];
+    const labels = rule({ files, pr: {}, enableDebug: false });
+    expect(labels).toEqual([]);
+  });
+
+  it('handles debug mode', () => {
+    const files = [{ filename: 'infra/main.tf' }];
+    expect(() => rule({ files, pr: {}, enableDebug: true })).not.toThrow();
+  });
+});

src/rules/infrastructure/infra-change.js

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+/**
+ * Infrastructure Config Change Rule
+ *
+ * Adds `infra-change` if infra-related files are modified.
+ */
+
+module.exports = function infraChangeRule({ files, pr, enableDebug }) {
+  const labels = [];
+
+  const hints = [
+    /^(infra|infrastructure|ops|deploy|deployment|k8s|helm|charts|terraform|ansible|chef|salt)\//i,
+    /^config\//i,
+    /\.(tf|tfvars|hcl|tpl)$/i,
+    /(^|\/)Dockerfile(\.|$)/i,
+    /(^|\/)docker-compose\.(ya?ml)$/i
+  ];
+
+  const detected = (files || []).some(f => {
+    const name = (f && f.filename ? String(f.filename) : '').toLowerCase();
+    return name && hints.some(rx => rx.test(name));
+  });
+
+  if (detected) {
+    labels.push('infra-change');
+  }
+
+  if (enableDebug) {
+    console.log(`[Infra Change Rule] → ${labels.join(', ') || 'none'}`);
+  }
+
+  return labels;
+};
+
+module.exports.metadata = {
+  name: 'Infrastructure Config Changes',
+  description: 'Detects changes to infrastructure/configuration files',
+  labels: [
+    { name: 'infra-change', color: '0075CA', description: 'Infrastructure/config changed' }
+  ],
+  author: 'pr-auto-labeler',
+  version: '1.0.0',
+  category: 'infrastructure'
+};
+
+