add_label.yml

name: "Add labels"

on:
  pull_request:

permissions:
  pull-requests: write

jobs:
  apply-label:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 0

      - uses: actions/github-script@v7
        with:
          script: |
            const { execSync } = require('child_process')
            const { commits } = context.payload.pull_request
            const rawFiles = execSync(`git diff --name-only HEAD HEAD~${commits}`).toString()
            const files = rawFiles.split('\n').filter(Boolean)

            console.log('##### Modified Files #####')
            console.log(files)
            console.log('##########################')

            // verify packages
            const packagesFiles = files.filter(file => file.startsWith('packages/') && !file.includes('mix_lint_test'))
            const packages = packagesFiles.map(file => file.split('/')[1])
            const newLabels = Array.from(new Set(packages))

            console.log('##### PackagesLabels #####')
            console.log(newLabels)
            console.log('##########################')
            
            // verify documentation 
            const wasDocModified = files.filter(file => file.startsWith('website/')).length > 0
            if (wasDocModified) {
              newLabels.push('documentation')
              console.log('documentation label was added')
            }

            // verify examples
            const wasExampleModified = files.filter(file => file.startsWith('examples/')).length > 0
            if (wasExampleModified) {
              newLabels.push('examples')
              console.log('examples label was added')
            }

            // verify repo
            const wasRepoModified = files.filter(file => !file.startsWith('website/') && !file.startsWith('packages/') && !file.startsWith('examples/')).length > 0
            if (wasRepoModified) {
              newLabels.push('repo')
              console.log('rep label was added')
            }

            console.log('##### New Labels #####')
            console.log(newLabels)
            console.log('##########################')

            // Get existing labels
            const existingLabels = await github.rest.issues.listLabelsOnIssue({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
            })

            const labelsToAdd = newLabels.filter(label => !existingLabels.data.some(existingLabel => existingLabel.name === label))
            const labelsToRemove = existingLabels.data.filter(existingLabel => !newLabels.includes(existingLabel.name))

            console.log('##### Labels to Add #####')
            console.log(labelsToAdd)
            console.log('##########################')

            console.log('##### Labels to Remove #####')
            console.log(labelsToRemove)
            console.log('##########################')

            // Add new labels
            if (labelsToAdd.length > 0) {
              await github.rest.issues.addLabels({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                labels: labelsToAdd
              })
            }

            // Remove unnecessary labels
            for (const label of labelsToRemove) {
              await github.rest.issues.removeLabel({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                name: label.name
              })
            }