Add Export utils

Author: Schmidely Stéphane

src/utils/commands/export/utils.ts

@@ -0,0 +1,27 @@
+import { EOL } from 'os'
+
+export default class ExportUtils {
+  constructor() {}
+
+  /**
+   * CLI flags of 'export' commands
+   * Filter 'help' command
+   */
+  public availableFlags(flags: any) {
+    return Object.keys(flags).filter((el, _index, _array) => {
+      return el !== 'help'
+    })
+  }
+
+  /**
+   * Format error message
+   */
+  public errorMessage(singularTitle: string, errorList: Array<string>) {
+    const plural = (errorList.length > 1) ? 's' : ''
+    const title = `${singularTitle}${plural}`
+    const details = errorList.map((error: string) => {
+      return `• ${error}`
+    }).join(EOL)
+    return `${title}${EOL}${details}`
+  }
+}