fix: introduce lint command (#26)

Author: patrickmichalina

src/commands/index.ts

@@ -4,6 +4,7 @@ import './serve'
 import './favicon'
 import './config'
 import './update'
+import './lint'
 import { argv } from 'yargs'
 
 argv

src/commands/lint.ts

@@ -0,0 +1,63 @@
+import { command } from 'yargs'
+import { logInfo, log } from '../utilities/log'
+import { Linter, Configuration, ILinterOptions } from 'tslint'
+import * as fs from 'fs'
+import chalk from 'chalk'
+import { resolve } from 'path'
+
+const fileName = resolve('src/server/server.ts')
+const configurationFilename = resolve('tslint.json')
+const options: ILinterOptions = {
+  fix: false,
+  formatter: 'json'
+}
+
+const fileContents = fs.readFileSync(fileName, 'utf8')
+const linter = new Linter(options)
+const configuration = Configuration.findConfiguration(
+  configurationFilename,
+  fileName
+).results
+linter.lint(fileName, fileContents, configuration)
+
+command(
+  'lint',
+  'check your code quality',
+  args => {
+    return args
+  },
+  args => {
+    lint()
+  }
+)
+
+function warnings(count: number) {
+  const str = count.toString()
+  return count > 0
+    ? chalk.underline(chalk.bgYellow(`  ${str}  `))
+    : chalk.underline(`  ${str}  `)
+}
+
+function errors(count: number) {
+  const str = count.toString()
+  return count > 0
+    ? chalk.underline(chalk.bgRed(`  ${str}  `))
+    : chalk.underline(`  ${str}  `)
+}
+
+function lint() {
+  logInfo('Linter\n')
+  const result = linter.getResult()
+  log(`  Errors: `, errors(result.errorCount))
+  log(`Warnings: `, warnings(result.warningCount), '\n')
+
+  result.failures.map(obj => obj.toJson()).forEach(json => {
+    log(
+      `${json.ruleSeverity}(${json.ruleName}): ${json.name} (${
+        json.startPosition.line
+      }, ${json.startPosition.character}): ${json.failure}`
+    )
+  })
+
+  log('\n')
+}

src/utilities/log.ts

@@ -14,7 +14,7 @@ export function logErrorWithPrefix(msg: any) {
   log(chalk.bgRedBright(`Error: ${msg}`))
 }
 
-export function logInfo(msg: any) {
+export function logInfo(msg: string) {
   log(chalk.blue(msg))
 }