Included Guilherme Victal works on overduedate

See https://github.com/freitass/todo.txt-vim/pull/45

syntax/python/dateregex/dateregex/before.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# File:        before.py
+# Author:      Guilherme Victal <guilherme at victal.eti.br>
+# Description: Generates regexes before a certain date
+# License:     Vim license
+# Website:     http://github.com/freitass/todo.txt-vim
+# Version:     0.1
+
+from datetime import date, timedelta, MINYEAR
+
+def _year_regex_before(year):
+    if int(year) <= MINYEAR: 
+        return None
+    year_regex = r'('
+    year_regex += r'\d{1,%s}' % str(len(year) - 1) if len(year) > 1 else ''
+    for idx, digit in enumerate(year):
+        if digit != '0':
+            regex = '|' + year[0:idx]
+            regex += '0' if digit == '1' else '[0-%s]' % str(int(digit) - 1)
+            if idx < len(year) - 1:
+                regex += '\d{%s}' % (len(year) - (idx + 1)) 
+            year_regex += regex
+
+    year_regex += ')'
+    return '-'.join((year_regex, r'\d{2}', r'\d{2}'))
+    
+def _month_regex_before(year, month):
+    if month == '01':
+        return None
+
+    digit1, digit2 = month
+    if digit1 == '0':
+        month_regex = '01' if month == '02' else r'0[1-%s]' % str(int(digit2) - 1)
+    elif month == '10':
+        month_regex = r'0\d' 
+    elif month == '11':
+        month_regex = r'(0\d|10)'
+    else:
+        month_regex = r'(0\d|1[01])'
+
+    return '-'.join((year, month_regex, r'\d{2}'))
+
+def _day_regex_before(year, month, day):
+    if day == '01':
+        return None
+    last_month_day = str((date(int(year), (int(month) + 1) % 12, 1) + - date.resolution).day)
+    last_digit1, last_digit2 = last_month_day
+
+    digit1, digit2 = day
+    if digit1 == '0':
+        day_regex = '01' if day == '02' else r'0[1-%s]' % str(int(digit2) - 1)
+    else:
+        day_regex = r'('
+        day_regex += '0' if digit1 == '1' else r'[0-%s]' % str(int(digit1) - 1)
+        day_regex += r'\d'
+        if digit2 != '0':
+            day_regex += '|'
+            day_regex += digit1
+            day_regex += '0' if digit2 == '1' else r'[0-%s]' % str(int(digit2) - 1)
+        day_regex += ')'
+
+    return '-'.join((year, month, day_regex))
+
+
+    
+
+def regex_date_before(given_date):
+    year, month, day = given_date.isoformat().split('-')
+
+    year_regex = _year_regex_before(year)
+    month_regex = _month_regex_before(year, month)
+    day_regex = _day_regex_before(year, month, day)
+
+    date_regex = '(' + year_regex if year_regex else '('
+    date_regex += ('|' + month_regex) if month_regex else ''
+    date_regex += ('|' + day_regex) if day_regex else ''
+    date_regex += ')'
+    return date_regex