Adding a workflow for scanning component files for stats

.github/workflows/codescan.yml

@@ -0,0 +1,73 @@
+name: 'Code Scan'
+
+on:
+  schedule:
+    - cron: '0 * * * *'
+
+jobs:
+  codescan:
+    name: Scan the repository
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+      - run: npm i -g npm@^10.5.1
+      - name: Install dependencies
+        run: npm ci
+
+      - uses: actions/github-script@v7
+        id: file-counts
+        with:
+          script: |
+            const fg = require('fast-glob')
+            const fs = require('fs')
+            const path = require('path')
+            const files = await fg.glob(['packages/react/src/**/*.tsx', 'packages/react/src/**/*.module.css'], {
+              ignore: [
+                '**/__tests__/**',
+                '**/_*.tsx',
+                '**/*.figma.tsx',
+                '**/*.stories.tsx',
+                '**/*.test.tsx',
+                '**/CSSComponent/**',
+                '**/hooks/**',
+                '**/index.tsx',
+                '**/utils/**',
+              ],
+            })
+
+            const metrics = []
+
+            for (const file of files) {
+              const content = fs.readFileSync(file, 'utf8')
+              const name = path.parse(file).name.replace('.module', '')
+              if (file.endsWith('.tsx')) {
+                const matched = content.match(/.`$([^`]*)^`$/gm)
+                if (matched) {
+                  const count = matched.join('\n').split('\n').length
+                  metrics.push(
+                    `- type: "count"\n  name: "primer.react.styled-system.count"\n  value: ${count}\n  tags:\n    - "path:${file}"\n    - "component:${name}"`,
+                  )
+                }
+              } else {
+                const count = content.split('\n').length
+                metrics.push(
+                  `- type: "count"\n  name: "primer.react.css-module.count"\n  value: ${count}\n  tags:\n    - "path:${file}"\n    - "component:${name}"`,
+                )
+              }
+            }
+
+            core.setOutput('metrics', metrics.join('\n'))
+
+      - name: Build count
+        uses: masci/datadog@v1
+        with:
+          api-key: ${{ secrets.datadog_api_key }}
+          metrics: ${{ steps.file-counts.outputs.metrics }}