feat: add lolwut command (#1137)

compat.md

@@ -82,7 +82,7 @@
 | [linsert]              | :white_check_mark: | :white_check_mark: |
 | [llen]                 | :white_check_mark: | :white_check_mark: |
 | [lmove]                | :white_check_mark: |        :x:         |
-| [lolwut]               | :white_check_mark: |        :x:         |
+| [lolwut]               | :white_check_mark: | :white_check_mark: |
 | [lpop]                 | :white_check_mark: | :white_check_mark: |
 | [lpos]                 | :white_check_mark: |        :x:         |
 | [lpush]                | :white_check_mark: | :white_check_mark: |

src/commands/index.js

@@ -51,6 +51,7 @@ export * from './lastsave'
 export * from './lindex'
 export * from './linsert'
 export * from './llen'
+export * from './lolwut'
 export * from './lpop'
 export * from './lpush'
 export * from './lpushx'

src/commands/lolwut.js

@@ -0,0 +1,60 @@
+const redisVersion = '6.2.3'
+
+// schotter, plotter on paper, by Georg Nees
+function version5() {
+  // Using lolwut version 5 20 10
+  return `⢰⠒⢲⠒⢲⠒⣶⠒⡖⢲⡖⢲⠒⣶⠒⡖⠒⡖⠒⡆
+  ⢸⠒⢺⠒⢺⠒⣿⠒⡗⢺⡗⢺⠒⣿⠒⡗⠒⡗⠒⡇
+  ⡞⠒⣾⣛⣻⣛⣿⢻⡟⢻⠛⣿⢻⡟⢻⠓⢲⣗⣒⡇
+  ⣻⠿⣿⣉⣯⣹⣏⣹⣯⣹⣏⣹⣉⣿⢹⣟⣻⣓⣺⠃
+  ⣌⣉⣿⠭⣧⣸⣏⣹⣯⣯⣯⣯⣽⣯⣿⣉⣹⣄⣸⠀
+  ⣯⣁⣿⣭⣽⣼⣼⡼⣿⣬⣇⣹⡮⣿⣻⣗⣽⣒⡼⡅
+  ⢗⣉⢿⣦⣿⣿⣧⢷⣷⣯⣧⣟⣷⣾⣼⣗⣿⢗⣹⢇
+  ⢳⠞⢺⠶⣿⠾⣟⣻⣾⠟⢷⣟⢾⢷⣿⣓⢧⡧⠴⡎
+  ⡼⠶⡞⢒⡾⠾⡝⢲⡷⡽⢾⣿⢼⣾⢿⠒⣾⡿⠶⡧
+  ⢷⠶⣷⣺⢷⣹⢟⣲⢫⠷⡯⢿⢽⢿⢾⡟⢺⢳⢲⠁
+  ⡸⠺⡺⣺⡻⢾⠞⢛⢶⡻⢞⠾⣹⢿⣾⠙⣻⠛⠺⡀
+  ⠈⠢⠊⠚⠒⠚⠑⠔⠑⠜⠣⠛⠼⠥⠼⠉⠋⠢⠊⠀
+  
+  Georg Nees - schotter, plotter on paper, 1968. Redis ver. ${redisVersion}`
+}
+
+// Plaguemon by hikimori
+function version6() {
+  // Using lolwut version 6 20 10
+  return `                    
+                    
+                    
+                    
+                    
+                    
+                    
+                    
+                    
+                    
+Dedicated to the 8 bit game developers of past and present.
+Original 8 bit image from Plaguemon by hikikomori. Redis ver. ${redisVersion}`
+}
+
+export function lolwut(VERSION = 'VERSION', version) {
+  if (VERSION && VERSION.toUpperCase() !== 'VERSION') {
+    throw new Error('ERR value is not an integer or out of range')
+  }
+
+  // eslint-disable-next-line eqeqeq
+  if (version == 6) {
+    return version6()
+  }
+
+  // eslint-disable-next-line eqeqeq
+  if (version == 5) {
+    return version5()
+  }
+
+  return version6()
+}
+
+export function lolwutBuffer(...args) {
+  const val = lolwut.apply(this, args)
+  return val ? Buffer.from(val) : val
+}

test/integration/commands/lolwut.js

@@ -0,0 +1,45 @@
+import Redis from 'ioredis'
+
+// eslint-disable-next-line import/no-relative-parent-imports
+import { runTwinSuite } from '../../../test-utils'
+
+runTwinSuite('lolwut', command => {
+  describe(command, () => {
+    const redis = new Redis()
+
+    afterAll(() => {
+      redis.disconnect()
+    })
+
+    test('should throw on invalid arguments', async () => {
+      expect.hasAssertions()
+
+      try {
+        await redis[command]('ver', 5)
+      } catch (err) {
+        expect(err.message).toMatch('ERR')
+      }
+    })
+
+    test('should return Plaguemon by hikikomori. by default', async () => {
+      const result = await redis[command]()
+      expect(Buffer.isBuffer(result) ? result.toString() : result).toMatch(
+        'hikikomori'
+      )
+    })
+
+    test('version 6', async () => {
+      const result = await redis[command]('version', 6, 20, 10)
+      expect(Buffer.isBuffer(result) ? result.toString() : result).toMatch(
+        'hikikomori'
+      )
+    })
+
+    test('version 5', async () => {
+      const result = await redis[command]('version', 5, 20, 10)
+      expect(Buffer.isBuffer(result) ? result.toString() : result).toMatch(
+        'schotter'
+      )
+    })
+  })
+})