ensure no dupe letters when generating hints

dev/generate-alphabets.js

@@ -1,5 +1,6 @@
 const huffman = require('n-ary-huffman')
 const range = require('lodash.range')
+const uniq = require('lodash.uniq')
 const path = require('path')
 const fs = require('fs')
 const MAX_MATCHES = 200
@@ -9,8 +10,6 @@ const exec = promisify(require('child_process').exec)
 
 const alphabetsDefinition = require('./alphabets.json')
 
-const alphabet = (process.argv[2] || '').split('')
-
 const ALPHABETS_DIR = path.resolve(__dirname, '../alphabets/')
 
 const items = range(1, MAX_MATCHES).map((i) => ({
@@ -35,6 +34,11 @@ async function main() {
   Object.keys(alphabetsDefinition).forEach(async alphabetName => {
     const alphabet = alphabetsDefinition[alphabetName].split('')
 
+    if (alphabet.length !== uniq(alphabet).length) {
+      console.error(`ERROR: ${alphabetName} contains duplicate characters`);
+      process.exit(1)
+    }
+
     const alphabetDir = path.resolve(ALPHABETS_DIR, alphabetName)
 
     await ensureDir(alphabetDir)

dev/package.json

@@ -9,6 +9,7 @@
   "dependencies": {
     "lodash.chunk": "^4.2.0",
     "lodash.range": "^3.2.0",
+    "lodash.uniq": "^4.5.0",
     "n-ary-huffman": "^4.0.0"
   }
 }

dev/yarn.lock

@@ -12,6 +12,11 @@ lodash.range@^3.2.0:
   resolved "https://registry.yarnpkg.com/lodash.range/-/lodash.range-3.2.0.tgz#f461e588f66683f7eadeade513e38a69a565a15d"
   integrity sha1-9GHliPZmg/fq3q3lE+OKaaVloV0=
 
+lodash.uniq@^4.5.0:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/lodash.uniq/-/lodash.uniq-4.5.0.tgz#d0225373aeb652adc1bc82e4945339a842754773"
+  integrity sha1-0CJTc662Uq3BvILklFM5qEJ1R3M=
+
 n-ary-huffman@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/n-ary-huffman/-/n-ary-huffman-4.0.0.tgz#a1b2efff0becf2d98b6591f31a29e0621b2d8320"