;bin: a version of hledger-register-max using a newer API

This one uses Hledger.Cli.Script to reduce import boilerplate,
and supports --help.

bin/hledger-register-max2.hs

@@ -0,0 +1,53 @@
+#!/usr/bin/env stack
+-- stack runghc --verbosity error --package hledger
+-- stack runghc --verbosity error --package hledger --package hledger-lib --package text --package safe 
+-- stack script --compile --resolver lts-20.8 --verbosity error --package hledger --package text
+-- stack script --compile --resolver lts-20.8 --verbosity error --package hledger --package hledger-lib --package text --package safe
+-- The topmost stack command above is used to run this script.
+-- stack script uses released hledger, stack runghc uses local hledger source.
+-- This script currently requires local hledger source, for Hledger.Cli.Script.
+------------------------------------78----------------------------------------
+
+{-# LANGUAGE OverloadedStrings, PackageImports #-}
+
+import Hledger.Cli.Script
+import qualified "text" Data.Text as T
+import qualified "text" Data.Text.IO as T
+
+cmdmode = hledgerCommandMode (unlines
+    -- Command name, then --help text, then _FLAGS; empty help lines get stripped:
+  ["register-match"
+  ,"Show the register item(s) with maximum (or with --invert, minimum) balance."
+  ,"Usage: hledger-register-max [REGISTERARGS]"
+  ,"or:    hledger register-max -- [REGISTERARGS]"
+  ,"For historical balances, add -H. For value, add -V --infer-market-prices."
+  ,"Examples:"
+  ,"$ hledger-register-max -f examples/bcexample.hledger -H checking"
+  ,"2013-01-03 Payroll  Assets:US:BofA:Checking  1350.60 USD  8799.22 USD"
+    ------------------------------------78----------------------------------------
+  ,""
+  ,"_FLAGS"
+  ])
+  [] [generalflagsgroup1] [] ([], Just $ argsFlag "[ARGS]")  -- or Nothing
+
+main = do
+  opts@CliOpts{reportspec_=rspec} <- getHledgerCliOpts cmdmode
+  withJournalDo opts $ \j -> do
+    let
+      r = postingsReport rspec j
+      maxbal = fifth5 $ maximumBy (comparing fifth5) r
+      is = filter ((== maxbal).fifth5) r
+    mapM_ printItem is
+
+printItem (_, _, _, p, bal) = do
+  let
+    d      = postingDate p
+    mt     = ptransaction p
+    desc   = fmt  30 $ maybe "-" tdescription mt
+    acct   = fmt  30 $ paccount p
+    amt    = fmta 12 $ T.pack $ showMixedAmountOneLine $ pamount p
+    baltxt = fmta 12 $ T.pack $ showMixedAmountOneLine bal
+  T.putStrLn $ T.unwords [showDate d, desc, "", acct, "", amt, " ", baltxt]
+  where
+    fmt w  = formatText True (Just w) (Just w) . textElideRight w
+    fmta w = formatText False (Just w) Nothing