Add sort by number

Allow sorting the legend by interpreting the labels as numbers if possible.
This is helpful when viewing era profiles, as these only have a number
label.

src/Eventlog/Args.hs

@@ -21,7 +21,7 @@ data Option
   = ShowVersion
   | Run Args
 
-data Sort = Size | StdDev | Name | Gradient
+data Sort = Size | StdDev | Name | Gradient | Number
 
 data Args = Args
   {
@@ -47,7 +47,7 @@ argParser :: Parser Option
 argParser = Run <$> (Args
       <$> option parseSort
           ( long "sort"
-         <> help "How to sort the bands.  One of: size (default), stddev, name, gradient."
+         <> help "How to sort the bands.  One of: size (default), stddev, name, number, gradient."
          <> value Size
          <> metavar "FIELD" )
       <*> switch
@@ -118,8 +118,9 @@ parseSort = eitherReader $ \s -> case s of
   "size" -> Right Size
   "stddev" -> Right StdDev
   "name" -> Right Name
+  "number" -> Right Number
   "gradient" -> Right Gradient
-  _ -> Left "expected one of: size, stddev, name"
+  _ -> Left "expected one of: size, stddev, name, number"
 
 args :: IO Option
 args = execParser argsInfo

src/Eventlog/Prune.hs

@@ -1,5 +1,6 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ViewPatterns #-}
+{-# LANGUAGE TypeApplications #-}
 module Eventlog.Prune
   ( pruneBands, pruneDetailed
   ) where
@@ -11,6 +12,8 @@ import Data.Map (Map, fromList, (!), toList)
 
 import Eventlog.Args (Args(..), Sort(..))
 import Data.Maybe
+import Text.Read (readMaybe)
+import qualified Data.Text as T
 
 type Compare a = a -> a -> Ordering
 
@@ -21,15 +24,20 @@ getComparison Args { sorting = StdDev, reversing = False }  = cmpStdDevDescendin
 getComparison Args { sorting = StdDev, reversing = True } = cmpStdDevAscending
 getComparison Args { sorting = Name,   reversing = True }  = cmpNameDescending
 getComparison Args { sorting = Name,   reversing = False } = cmpNameAscending
+getComparison Args { sorting = Number,   reversing = True }  = cmpNumberDescending
+getComparison Args { sorting = Number,   reversing = False } = cmpNumberAscending
 getComparison Args { sorting = Gradient,   reversing = True }  = cmpGradientAscending
 getComparison Args { sorting = Gradient,   reversing = False } = cmpGradientDescending
 
 cmpNameAscending, cmpNameDescending,
+  cmpNumberAscending, cmpNumberDescending,
   cmpStdDevAscending, cmpStdDevDescending,
   cmpSizeAscending, cmpSizeDescending,
   cmpGradientAscending, cmpGradientDescending :: Compare (Bucket, BucketInfo)
 cmpNameAscending = comparing fst
 cmpNameDescending = flip cmpNameAscending
+cmpNumberAscending (Bucket a, _) (Bucket b, _) = comparing (readMaybe @Int . T.unpack) a b <> compare a b
+cmpNumberDescending = flip cmpNumberAscending
 cmpStdDevAscending = comparing (bucketStddev . snd)
 cmpStdDevDescending = flip cmpStdDevAscending
 cmpSizeAscending = comparing (bucketTotal . snd)