feat: add formatTime function, add tests

src/util.js

@@ -1,5 +1,26 @@
-function formatTime () {
-  //
+/**
+ * Converts Elmas weird int-as-string times to formatted strings.
+ * @param {string} str String to pad
+ * @param {integer} pad Amount to pad
+ * @returns {string} string
+ */
+function formatTime (time) {
+  time = time.toString()
+  let formatted = ['0', '0', ':', '0', '0', ',', '0', '0']
+
+  // If input time is longer than 6 characters, return max time?
+  if (time.length > 6) return '59:59,99'
+
+  let n = 7
+  for (let i = time.length - 1; i >= 0; i--) {
+    // If first digit of minutes or seconds are over 5, throw error?
+    if (((n === 3) || (n === 0)) && (time.charCodeAt(i) > 53)) throw new Error('Invalid time format')
+    formatted[n] = time[i]
+    if (n === 6 || n === 3) n -= 2
+    else if (n > 0) n -= 1
+  }
+
+  return formatted.join('')
 }
 
 /**

test/test.js

@@ -457,3 +457,37 @@ test('getTime, unfinished, single, event, framediff', t => {
 /* * * * * * * *
  * Util tests  *
  * * * * * * * */
+test('nullpadString, string length longer than padding', t => {
+  t.is(nullpadString('teststring', 4), 'test')
+})
+
+test('nullpadString, non-ASCII string throws error', t => {
+  const error = t.throws(() => {
+    nullpadString('this is not ascii: ►', 4)
+  }, Error)
+
+  t.is(error.message, 'String contains non-ASCII values')
+})
+
+test('formatTime gives correct values', t => {
+  t.is(formatTime(114801), '11:48,01')
+  t.is(formatTime(10021), '01:00,21')
+  t.is(formatTime(10099), '01:00,99')
+  t.is(formatTime(590099), '59:00,99')
+  t.is(formatTime(1000), '00:10,00')
+  t.is(formatTime(0), '00:00,00')
+  t.is(formatTime(1922039), '59:59,99')
+})
+
+test('formatTime, invalid time format throws error', t => {
+  const error1 = t.throws(() => {
+    formatTime(601039)
+  }, Error)
+
+  const error2 = t.throws(() => {
+    formatTime(16039)
+  }, Error)
+
+  t.is(error1.message, 'Invalid time format')
+  t.is(error2.message, 'Invalid time format')
+})