feat(Output): add Output class for commands

src/Library/Output/Output.ts

@@ -0,0 +1,137 @@
+import Table from 'cli-table';
+import prettyjson from 'prettyjson';
+import PrettyError from 'pretty-error';
+
+export class Output {
+  private exitCode: number = 0;
+
+  private data: any[] = [];
+
+  private prettyError: PrettyError = new PrettyError();
+
+  public static create () {
+    return new this();
+  }
+
+  public static errorOutput (error?: string | Error, exitCode?: number) {
+    const output = new this();
+
+    output.error(error, exitCode);
+
+    return output;
+  }
+
+  /**
+   * Exit code to use upon send.
+   *
+   *  NOTE: Exit codes 1 - 2, 126 - 165, and 255 have special meanings
+   *        and should therefore be avoided for user-specified exit parameters.
+   *        Try restricting user-defined exit codes to the range 64 - 113 (in addition to 0, for success).
+   *
+   * 1 - Catchall for general errors
+   * 2 - Misuse of shell builtins (according to Bash documentation)
+   * 126 - Command invoked cannot execute
+   * 127 - “command not found”
+   * 128 - Invalid argument to exit
+   * 128+n - Fatal error signal “n”
+   * 130 - Script terminated by Control-C
+   * 255\* - Exit status out of range
+   *
+   * @see http://tldp.org/LDP/abs/html/exitcodes.html
+   *
+   * @param {Number} exitCode
+   *
+   * @return {this}
+   */
+  public setExitCode (exitCode: number): this {
+    this.exitCode = exitCode;
+
+    return this;
+  }
+
+  public addData (data: any): this {
+    if (data.constructor === Object) {
+      return this.addData(prettyjson.render(data));
+    }
+
+    this.data.push(data);
+
+    return this;
+  }
+
+  public resetData (): this {
+    this.data = [];
+
+    return this;
+  }
+
+  public addHorizontalTable (head: string[], data: Array<string>[], options: any = {}): this {
+    const table = new Table({ head, ...options });
+
+    table.push(...data);
+
+    this.addData(table);
+
+    return this;
+  }
+
+  public addVerticalTable (data: {[key: string]: string}[], options?: any): this {
+    const table = new Table(options);
+
+    table.push(...data);
+
+    this.addData(table);
+
+    return this;
+  }
+
+  public addCrossTable (head: string[], data: {[key: string]: string[]}[], options: any = {}):this {
+    const table = new Table(options);
+
+    table.push(...data);
+
+    this.addData(table);
+
+    return this;
+  }
+
+  /**
+   * Add/set an error to output.
+   *
+   * @param {Error|string}  [error]     The error to write.         Default to "Unknown error".
+   * @param {Number|null}   [exitCode]  The code to exit with.      Default to 1. Use null to not change the exitCode.
+   * @param {boolean}       [clear]     Clear previously set data.  Default to false.
+   *
+   * @return {this}
+   */
+  public error (error: Error | string = 'Unknown error', exitCode: number = 1, clear: boolean = false): this {
+    if (!this.prettyError) {
+      this.prettyError = new PrettyError();
+    }
+
+    if (exitCode) {
+      this.setExitCode(exitCode);
+    }
+
+    if (clear) {
+      this.resetData();
+    }
+
+    this.addData(this.prettyError.render(error));
+
+    return this;
+  }
+
+  /**
+   * Write the output to the console.
+   */
+  public flush () {
+    this.data.forEach((piece: any) => console.log(piece));
+  }
+
+  public send () {
+    this.flush();
+
+    process.exit(this.exitCode);
+  }
+}

src/Library/Output/OutputService.ts

@@ -0,0 +1,3 @@
+export class OutputService {
+
+}

src/Library/Output/index.ts

@@ -0,0 +1 @@
+export * from './Output';