feat(workflow): add automated pull request triage (#513)

Author: Harxhit

.github/scripts/triagePr.js

@@ -0,0 +1,116 @@
+module.exports = async ({github, context}) => {
+    const owner = context.repo.owner; 
+    const repo = context.repo.repo;
+    const pr = context.payload.pull_request;
+    const prNumber = pr.number;  
+    const username = pr.user.login; 
+
+    const backendFiles = []; 
+    const webFiles = []; 
+    const mobileFiles = []; 
+    const devopsFiles = []; 
+
+    const labels = []; 
+    let primaryArea = null;
+    let reviewer = null; 
+
+    try {
+        const changedFiles = await github.paginate(
+            github.rest.pulls.listFiles,
+            {
+                owner,
+                repo,
+                pull_number: prNumber
+            }
+        );
+        
+        changedFiles.forEach((file) => {
+            const fileName = file.filename;
+            
+            if(fileName.startsWith('apps/backend/')){
+                backendFiles.push(fileName); 
+            }else if(fileName.startsWith('apps/web/')){
+                webFiles.push(fileName); 
+            }else if(fileName.startsWith('apps/mobile/')){
+                mobileFiles.push(fileName)
+            }else if(fileName.startsWith('.github/') || fileName.startsWith('infra/') || fileName.startsWith('terraform/')){
+                devopsFiles.push(fileName)
+            }
+        })
+
+
+        if(backendFiles.length > 0){
+            labels.push('backend')
+
+            if(!primaryArea){
+                primaryArea = 'backend'; 
+                reviewer = '@Harxhit'
+            }
+        }
+        if(mobileFiles.length > 0){
+          labels.push('mobile'); 
+          if(!primaryArea){
+            primaryArea = 'mobile'; 
+            reviewer = '@blankirigaya'
+          }
+        }
+        if(webFiles.length > 0){
+            labels.push('web'); 
+            if(!primaryArea){
+                primaryArea = 'web'; 
+                reviewer = '@ShantKhatri'
+            }
+        }
+        if(devopsFiles.length > 0){
+            labels.push('devops')
+            if(!primaryArea){
+                primaryArea = 'devops'
+                reviewer = '@ShantKhatri'
+            }
+        }
+
+        if(labels.length === 0){
+            return; 
+        }
+
+        await github.rest.issues.addLabels({
+            owner,
+            repo,
+            issue_number: prNumber,
+            labels
+        });
+    const body = `Hi @${username},
+
+Thanks for opening this pull request.
+
+This PR has been automatically classified based on the files modified.
+
+### Applied Labels
+
+${labels.map(label => `- ${label}`).join('\n')}
+
+### Primary Review Area
+
+* ${primaryArea}
+
+### Reviewer
+
+${reviewer} has been identified as the primary reviewer for this pull request.
+
+If you have any questions regarding the affected area or implementation details, feel free to reach out to the assigned reviewer.
+
+Thank you for your contribution! `;
+
+
+        await github.rest.issues.createComment({
+            owner,
+            repo,
+            issue_number: prNumber,
+            body: body
+        });
+
+    } catch (error) {
+        console.error(error)
+    }
+
+}

.github/workflows/triagePr.yml

@@ -0,0 +1,25 @@
+name: Pull request triage
+
+on:
+  pull_request:
+    types: [opened]
+
+permissions:
+  pull-requests: write
+  issues: write
+
+jobs: 
+  assignLabel: 
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd #v6.0.2
+
+      - name: Triage pull request
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 #v9.0.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const script = require('./.github/scripts/triagePr.js');
+            await script({ github, context });