only do to_pretty_time as relative when requested

modules/coins.py

@@ -194,7 +194,7 @@ class Module(ModuleManager.BaseModule):
                 time_left = self.bot.cache.until_expiration(cache)
                 event["stderr"].write("%s: Please wait %s before redeeming" % (
                     event["user"].nickname,
-                    utils.datetime.format.to_pretty_time(time_left)))
+                    utils.datetime.format.to_pretty_until(time_left)))
         else:
             event["stderr"].write(
                 "%s: You can only redeem coins when you have none" %
@@ -492,7 +492,7 @@ class Module(ModuleManager.BaseModule):
     def next_lottery(self, event):
         until = self._until_next_6_hour()
         event["stdout"].write("Next lottery is in: %s" %
-            utils.datetime.format.to_pretty_time(until))
+            utils.datetime.format.to_pretty_until(until))
 
     @utils.hook("received.command.lotterywinner")
     @utils.kwarg("help", "Show who last won the lottery")

modules/messages.py

@@ -16,7 +16,7 @@ class Module(ModuleManager.BaseModule):
             for i, message in enumerate(message_list):
                 seconds = utils.datetime.seconds_since(message.line.timestamp)
                 messages.append("(%d/%d) %s ago %s" % (i+1, message_count,
-                    utils.datetime.format.to_pretty_time(seconds),
+                    utils.datetime.format.to_pretty_since(seconds),
                     message.line.format()))
 
             event["stdout"].write("%s: found: %s"

modules/seen.py

@@ -35,7 +35,7 @@ class Module(ModuleManager.BaseModule):
                     seen_info = " (%s%s)" % (seen_info["action"],
                         utils.consts.RESET)
 
-            since = utils.datetime.format.to_pretty_time(
+            since = utils.datetime.format.to_pretty_since(
                 time.time()-seen_seconds, max_units=2)
             event["stdout"].write("%s was last seen %s ago%s" % (
                 event["args_split"][0], since, seen_info or ""))

modules/stats.py

@@ -7,7 +7,7 @@ HIDDEN_MODES = set(["s", "p"])
 
 class Module(ModuleManager.BaseModule):
     def _uptime(self):
-        return utils.datetime.format.to_pretty_time(
+        return utils.datetime.format.to_pretty_since(
             int(time.time()-self.bot.start_time))
 
     @utils.hook("received.command.uptime")

modules/tweets/format.py

@@ -3,7 +3,7 @@ from src import utils
 
 def _timestamp(dt):
     seconds_since = time.time()-dt.timestamp()
-    timestamp = utils.datetime.format.to_pretty_time(
+    timestamp = utils.datetime.format.to_pretty_since(
         seconds_since, max_units=2)
     return "%s ago" % timestamp
 

src/utils/datetime/common.py

@@ -40,3 +40,7 @@ def timestamp(seconds: float) -> _datetime.datetime:
 
 def seconds_since(dt: _datetime.datetime) -> float:
     return (utcnow()-dt).total_seconds()
+
+class RelativeDirection(enum.Enum):
+    FORWARD = 1
+    BACKWARD = 2

src/utils/datetime/format.py

@@ -48,31 +48,55 @@ def time_unit(seconds: int) -> typing.Tuple[int, str]:
         unit = "%ss" % unit # pluralise the unit
     return (since, unit)
 
-def to_pretty_time(total_seconds: int, minimum_unit: int=UNIT_SECOND,
+def to_pretty_time(total_seconds: int, max_units: int=UNIT_MINIMUM,
-        max_units: int=UNIT_MINIMUM) -> str:
+        direction: typing.Optional[RelativeDirection]=None) -> str:
     if total_seconds == 0:
         return "0s"
 
+    if not direction == None:
         now = utcnow()
-    later = now+_datetime.timedelta(seconds=total_seconds)
+        later = now
-    relative = dateutil.relativedelta.relativedelta(later, now)
+        mod = _datetime.timedelta(seconds=total_seconds)
+        if direction == RelativeDirection.FORWARD:
+            later += mod
+        else:
+            later -= mod
+        relative = dateutil.relativedelta.relativedelta(
+            *sorted([later, now], reverse=True))
+        years = relative.years
+        months = relative.months
+        weeks, days = divmod(relative.days, 7)
+        hours = relative.hours
+        minutes = relative.minutes
+        seconds = relative.seconds
+    else:
+        years, months    = 0, 0
+        weeks, days      = divmod(total_seconds, SECONDS_WEEKS)
+        days, hours      = divmod(days, SECONDS_DAYS)
+        hours, minutes   = divmod(hours, SECONDS_HOURS)
+        minutes, seconds = divmod(minutes, SECONDS_MINUTES)
 
     out: typing.List[str] = []
-    if relative.years and minimum_unit >= UNIT_YEAR and len(out) < max_units:
+    if years and len(out) < max_units:
-        out.append("%dy" % relative.years)
+        out.append("%dy" % years)
-    if relative.months and minimum_unit >= UNIT_MONTH and len(out) < max_units:
+    if months and len(out) < max_units:
-        out.append("%dmo" % relative.months)
+        out.append("%dmo" % months)
-    weeks, days = divmod(relative.days, 7)
+    if weeks and len(out) < max_units:
-    if weeks and minimum_unit >= UNIT_WEEK and len(out) < max_units:
         out.append("%dw" % weeks)
-    if days and minimum_unit >= UNIT_DAY and len(out) < max_units:
+    if days and len(out) < max_units:
         out.append("%dd" % days)
-    if relative.hours and minimum_unit >= UNIT_HOUR and len(out) < max_units:
+    if hours and len(out) < max_units:
-        out.append("%dh" % relative.hours)
+        out.append("%dh" % hours)
-    if relative.minutes and minimum_unit >= UNIT_MINUTE and len(out) < max_units:
+    if minutes and len(out) < max_units:
-        out.append("%dmi" % relative.minutes)
+        out.append("%dmi" % minutes)
-    if relative.seconds and minimum_unit >= UNIT_SECOND and len(out) < max_units:
+    if seconds and len(out) < max_units:
-        out.append("%ds" % relative.seconds)
+        out.append("%ds" % seconds)
 
     return " ".join(out)
 
+def to_pretty_since(total_seconds: int, max_units: int=UNIT_MINIMUM
+        ) -> str:
+    return to_pretty_time(total_seconds, max_units, RelativeDirection.BACKWARD)
+def to_pretty_until(total_seconds: int, max_units: int=UNIT_MINIMUM
+        ) -> str:
+    return to_pretty_time(total_seconds, max_units, RelativeDirection.FORWARD)