Initial commit

entrypoint.js

@@ -0,0 +1,103 @@
+const {Toolkit} = require('actions-toolkit')
+const fs = require('fs')
+const minimatch = require('minimatch')
+const yaml = require('js-yaml')
+
+const tools = new Toolkit()
+
+main().catch(err => {
+  tools.log.fatal(err)
+  tools.exit.failure()
+})
+
+async function main() {
+  const specFile = readSpecFile()
+  const changedFiles = await getChangedFiles()
+
+  for (const label in specFile) {
+    let globs
+
+    if (typeof specFile[label] === 'string') {
+      globs = [specFile[label]]
+    } else if (Array.isArray(specFile[label])) {
+      globs = specFile[label]
+    } else {
+      throw new Error('Spec file values must be strings or arrays of strings')
+    }
+
+    for (const glob of globs) {
+      for (const changedFile of changedFiles) {
+        if (minimatch(changedFile, glob)) {
+          await tools.github.issues.addLabels(
+            tools.context.issue({labels: [label]})
+          )
+        }
+      }
+    }
+  }
+}
+
+async function getChangedFiles(changedFiles = [], cursor = null) {
+  const [nextCursor, paths] = await queryChangedFiles(cursor)
+
+  if (paths.length < 100) {
+    return changedFiles.concat(paths)
+  }
+
+  return getChangedFiles(changedFiles.concat(paths), nextCursor)
+}
+
+async function queryChangedFiles(cursor) {
+  const result = await tools.github.graphql(
+    `
+    query($owner: String!, $repo: String!, $number: Int!, $cursor: String) {
+      repository(owner: $owner, name: $repo) {
+        pullRequest(number: $number) {
+          files(first: 100, after: $cursor) {
+            edges {
+              cursor
+            }
+
+            nodes {
+              path
+            }
+          }
+        }
+      }
+    }
+  `,
+    tools.context.issue({cursor})
+  )
+
+  const nextCursor = result.repository.pullRequest.files.edges.cursor
+  const paths = result.repository.pullRequest.files.nodes.map(node => node.path)
+  return [nextCursor, paths]
+}
+
+function readSpecFile() {
+  const specFilePath = process.env.LABEL_SPEC_FILE
+
+  let specFile
+
+  try {
+    specFile = yaml.safeLoad(fs.readFileSync(specFilePath))
+  } catch (err) {
+    if (err.code === 'ERR_INVALID_ARG_TYPE') {
+      tools.log.error('You must provide a LABEL_SPEC_FILE environment variable')
+    }
+
+    if (err.code === 'ENOENT') {
+      tools.log.error(
+        `Expected a configuration file at "${specFilePath}", but no file was found`
+      )
+    }
+
+    if (err.name === 'YAMLException') {
+      tools.log.error('Configuration file is not valid YAML')
+    }
+
+    throw err
+  }
+
+  return specFile
+}