[units] add length units

units.py

@@ -5,10 +5,11 @@
 Licensed under the Eiffel Forum License 2.
 
 """
-from willie.module import command, example
+from willie.module import command, commands, example
 import re
 
 find_temp = re.compile('([0-9]*\.?[0-9]*)[ °]*(K|C|F)',  re.IGNORECASE)
+find_length = re.compile('([0-9]*\.?[0-9]*)[ ]*(mile|m|meter|km|cm|kilometer|inch|in|ft|foot|feet)',  re.IGNORECASE)
 
 def f_to_c(temp):
     return (float(temp) - 32) * 5/9
@@ -43,3 +44,35 @@ def temperature(bot, trigger):
     kelvin = c_to_k(celsius)
     fahrenheit = c_to_f(celsius)
     bot.reply("%s°C = %s°F = %s°K" % (celsius, fahrenheit, kelvin))
+
+@commands('length', 'distance')
+@example('.distance 3km')
+def distance(bot, trigger):
+    """
+    Convert distances
+    """
+    source = find_length.match(trigger.group(2)).groups()
+    unit = source[1].lower()
+    numeric = float(source[0])
+    meter = 0
+    if unit == "m" or unit == "meter":
+        meter = numeric
+    elif unit == "kilometer" or unit == "km":
+        meter = numeric * 1000
+    elif unit == "mile":
+        meter = numeric / 0.00062137
+    elif unit == "inch" or unit == "in":
+        meter = numeric / 39.370
+    elif unit == "cm":
+        meter = numeric / 100
+    elif unit == "ft" or unit == "foot" or unit == "feet":
+        meter = numeric / 3.2808
+
+    inch = meter * 39.370
+    mile = meter * 0.00062137
+    if meter >= 1000:
+        bot.reply("%skm = %smile" % (meter/1000, mile))
+    elif meter < 1:
+        bot.reply("%scm = %sinch" % (meter*100, inch))
+    else:
+        bot.reply("%sm = %sinch" % (meter, inch))