cdt-141 Add Cron Job support

package.json

@@ -20,6 +20,8 @@
     "axios": "^0.21.1",
     "chalk": "^3.0.0",
     "codecov": "^3.8.1",
+    "cron-validator": "^1.2.1",
+    "cronstrue": "^1.110.0",
     "crypto-js": "^4.0.0",
     "detect-character-encoding": "^0.8.0",
     "encoding-japanese": "^1.0.30",

src/commands/cron.ts

@@ -0,0 +1,71 @@
+import {Command, flags} from '@oclif/command'
+import chalk from 'chalk'
+import {isValidCron} from 'cron-validator'
+import cronstrue from 'cronstrue'
+
+import Logger from '../utilities/logger'
+import Utilities from '../utilities/utilities'
+/*
+* this Commands add support for cron jobs
+*  */
+export default class Cron extends Command {
+  static description = 'Cron Expressions helper and scheduler'
+
+  static RUN = 'run'
+  static DESCRIBE = 'desc'
+
+  static flags = {
+    help: flags.help({char: 'h'}),
+    string: flags.string({char: 's' , description: 'Cron expression'}),
+    describe: flags.boolean({char: 'd' , description: 'Describe cron expressions into human readable descriptions'}),
+    run: flags.boolean({char: 'r' , description: 'run command using cron expression'}),
+  }
+
+  static args = [{name: 'string'}]
+
+  // only 2 parameters required HASH_TYPE and INPUT_STRING
+  async run() {
+    const {args, flags} = this.parse(Cron)
+
+    args.string = Utilities.getInputStringFromCmd(this, flags, args) // from either -s or args
+    args.action = this.getAction(flags, args) //by default let it be sha1
+
+    //check params after evaluating all
+    this.checkParameters(flags, args)
+    this.evalCron(flags, args)
+  }
+
+  // to check required parameters passed or not
+  // tslint:disable-next-line:no-unused
+  private checkParameters(flags: any, args: any) {
+    if (args.string === undefined || args.string === '')
+      Logger.error(this, 'Input string is empty or undefined')
+
+    if (!isValidCron(args.string)) {
+      Logger.error(this, `Invalid Cron expression : ${chalk.red(args.string)}`)
+    }
+
+    if (args.action === undefined || args.string === '')
+      Logger.error(this, 'Action empty or undefined')
+  }
+
+  // tslint:disable-next-line:no-unused
+  private evalCron(flags: any, args: any) {
+    // Logger.success(this, `Action: ${chalk.green(args.action)}`)
+    if (args.action === Cron.DESCRIBE) {
+      let output = cronstrue.toString(args.string)
+      Logger.success(this, output)
+    } else if (args.action === Cron.RUN) {
+      Logger.success(this, 'run command, coming soon...')
+    }
+  }
+
+  // tslint:disable-next-line:no-unused
+  private getAction(flags: any, args: any) {
+    if (flags.describe) // find  human readable descriptions for cron
+      return Cron.DESCRIBE
+    else if (flags.run) // if run is given
+      return Cron.RUN
+    Logger.error(this, 'Invalid Or Unsupported action')
+  }
+}

src/utilities/utilities.ts

@@ -40,6 +40,15 @@ export default class Utilities {
       return args.string
   }
 
+  // tslint:disable-next-line:no-unused
+  public static getInputStringFromCmd(thisRef: Command, flags: any, args: any) { //need to make it static so Crypto can use this
+    // if -s is not passed we will take it from args
+    if (flags.string) //if -s given
+      return flags.string
+    else
+      return args.string
+  }
+
   public static writeStringToFile(thisRef: Command, filePath: string, string: string) {
     if (!fs.existsSync(filePath))
       Logger.info(thisRef, `Could not find file: ${chalk.yellow(filePath + ', creating new one')}`) // this will output error and exit command

test/commands/cron.test.ts

@@ -0,0 +1,33 @@
+import {expect, test} from '@oclif/test'
+
+describe('cron', () => {
+  test
+    .stdout()
+    .command(['cron'])
+    .exit(0)
+    .it('Nothing is passed', ctx => {
+      expect(ctx.stdout).to.contain('Invalid Or Unsupported action')
+    })
+  test
+    .stdout()
+    .command(['cron', '-d', '* * * x *'])
+    .exit(0)
+    .it('Invalid Cron Expression', ctx => {
+      expect(ctx.stdout).to.contain('Invalid Cron expression')
+    })
+
+  test
+    .stdout()
+    .command(['cron', '-d', '15 14 1 * *'])
+    .it('Describe cron with arg for input', ctx => {
+      expect(ctx.stdout).to.contain('At 02:15 PM, on day 1 of the month')
+    })
+
+  test
+    .stdout()
+    .command(['cron', '-d', '-s', '0 22 * * 1-5'])
+    .it('Describe cron with -s flag for input', ctx => {
+      expect(ctx.stdout).to.contain('At 10:00 PM, Monday through Friday')
+    })
+
+})