feat: quarterly feature

Author: FreaKzero

index.js

@@ -1,6 +1,7 @@
 const langParser = (pattern, string) => {
   const matchyear = /yearly/.test(string);
   const matchweek = /weekly/.test(string);
+  const matchquarter = /quarterly/.test(string);
   if (matchyear) {
     return pattern.map((e, idx) => {
       if ([3, 4].indexOf(idx) > -1) {
@@ -18,7 +19,7 @@ const langParser = (pattern, string) => {
     pattern[3] = '*/7';
     let changed = false;
     return pattern.map((e, idx) => {
-      if (idx < 4 && e === '*' && !changed) {
+      if (idx < 3 && e === '*' && !changed) {
         return 0;
       } else if (idx === 5) {
         return '*';
@@ -28,6 +29,17 @@ const langParser = (pattern, string) => {
     });
   }
 
+  if (matchquarter) {
+    pattern[4] = '*/3';
+    let changed = false;
+    return pattern.map((e, idx) => {
+      if (idx < 3 && e === '*' && !changed) {
+        return 0;
+      }
+      changed = true;
+      return e;
+    });
+  }
   return pattern;
 };
 

readme.md

@@ -96,7 +96,7 @@ Be sure when you want to use intervals that you dont use the _at_ token in your
 
 ### Tokens:
 
-`second, minute, hour, day, month`  
+`second, minute, hour, day, month`
 
 Examples:
 
@@ -106,24 +106,40 @@ on december every 1 hour
 every 12 hours
 ```
 
-### Special Tokens 
+### Special Tokens
 
 ## Yearly
+
 Always will run on first of january at 0:00 if no time is given.  
 Weekdays are not possible with this expression and will be overwritten.
 
-Examples:  
+Examples:
+
 ```
 yearly
 yearly at 9:30
 ```
 
 ## Weekly
-Weekly will run on every 7th day of month (*/7) at 0:00 if no time is given.
+
+Weekly will run on every 7th day of month (\*/7) at 0:00 if no time is given.  
 Weekdays are not possible with this expression and will be overwritten.
 
-Examples:  
+Examples:
+
 ```
 weekly at 9:30
 weekly in 15 minute intervals on january
 ```
+
+## Quarterly
+
+Quarterly will run on every 3rd month of year (\*/3) at 0:00 if no time is given.  
+Weekdays are possible
+
+Examples:
+
+```
+quarterly at 9:30
+quarterly at 9:30 on mondays
+```

test.js

@@ -58,6 +58,8 @@ test('weekly in 15 minute intervals on january', '0 */15 * */7 1 *');
 test('weekly on january', '0 0 0 */7 1 *');
 test('weekly at 9:30:15', '15 30 9 */7 * *');
 test('weekly at 9:30', '0 30 9 */7 * *');
+test('quarterly', '0 0 0 * */3 *');
+test('quarterly at 9:30 on mondays', '0 30 9 * */3 1');
 
 if (process.env.TESTWATCH) {
   process.stdout.write('\u001b[3J\u001b[2J\u001b[1J');