- use different pen for write logs

- remove default value for configuration, to cleanly fallback to defaults
- rename gitHelper, move dir exists helper
- add reading input values group
- improve warning for configuration

src/gitHelper.ts

@@ -0,0 +1,85 @@
+import * as exec from '@actions/exec'
+import * as fs from 'fs'
+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()
+  }
+
+  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
+}