refactor: Extract github-related calls

src/pr-collector/gitHelper.ts

@@ -0,0 +1,74 @@
+import * as exec from '@actions/exec'
+import * as io from '@actions/io'
+import {directoryExistsSync} from './utils'
+
+export async function createCommandManager(workingDirectory: string): Promise<GitCommandManager> {
+  return await GitCommandManager.createCommandManager(workingDirectory)
+}
+
+class GitCommandManager {
+  private gitPath = ''
+  private workingDirectory = ''
+
+  // Private constructor; use createCommandManager()
+  private constructor() {}
+
+  getWorkingDirectory(): string {
+    return this.workingDirectory
+  }
+
+  async latestTag(): Promise<string> {
+    const revListOutput = await this.execGit(['rev-list', '--tags', '--skip=0', '--max-count=1'])
+    const output = await this.execGit(['describe', '--abbrev=0', '--tags', revListOutput.stdout.trim()])
+    return output.stdout.trim()
+  }
+
+  async initialCommit(): Promise<string> {
+    const revListOutput = await this.execGit(['rev-list', '--max-parents=0', 'HEAD'])
+    return revListOutput.stdout.trim()
+  }
+
+  async tagCreation(tagName: string): Promise<string> {
+    const creationDate = await this.execGit(['for-each-ref', '--format="%(creatordate:rfc)"', `refs/tags/${tagName}`])
+    return creationDate.stdout.trim().replace(/"/g, '')
+  }
+
+  static async createCommandManager(workingDirectory: string): Promise<GitCommandManager> {
+    const result = new GitCommandManager()
+    await result.initializeCommandManager(workingDirectory)
+    return result
+  }
+
+  private async execGit(args: string[], allowAllExitCodes = false, silent = false): Promise<GitOutput> {
+    directoryExistsSync(this.workingDirectory, true)
+
+    const result = new GitOutput()
+
+    const stdout: string[] = []
+
+    const options = {
+      cwd: this.workingDirectory,
+      silent,
+      ignoreReturnCode: allowAllExitCodes,
+      listeners: {
+        stdout: (data: Buffer) => {
+          stdout.push(data.toString())
+        }
+      }
+    }
+
+    result.exitCode = await exec.exec(`"${this.gitPath}"`, args, options)
+    result.stdout = stdout.join('')
+    return result
+  }
+
+  private async initializeCommandManager(workingDirectory: string): Promise<void> {
+    this.workingDirectory = workingDirectory
+    this.gitPath = await io.which('git', true)
+  }
+}
+
+class GitOutput {
+  stdout = ''
+  exitCode = 0
+}