lib: add dropRawOpt, cliOptsDropArgs

hledger-lib/Hledger/Data/RawOptions.hs

@@ -11,6 +11,7 @@ module Hledger.Data.RawOptions (
   RawOpts,
   mkRawOpts,
   overRawOpts,
+  dropRawOpt,
   setopt,
   setboolopt,
   unsetboolopt,
@@ -53,6 +54,9 @@ mkRawOpts = RawOpts
 overRawOpts :: ([(String,String)] -> [(String,String)]) -> RawOpts -> RawOpts
 overRawOpts f = RawOpts . f . unRawOpts
 
+dropRawOpt :: String -> RawOpts -> RawOpts
+dropRawOpt a = overRawOpts $ filter (not.(==a).fst)
+
 setopt :: String -> String -> RawOpts -> RawOpts
 setopt name val = overRawOpts (++ [(name, val)])
 

hledger/Hledger/Cli/CliOptions.hs

@@ -58,6 +58,7 @@ module Hledger.Cli.CliOptions (
   getHledgerCliOpts,
   getHledgerCliOpts',
   rawOptsToCliOpts,
+  cliOptsDropArgs,
   outputFormats,
   defaultOutputFormat,
   CommandHelpStr,
@@ -641,6 +642,10 @@ rawOptsToCliOpts rawopts = do
              ,available_width_ = availablewidth
              }
 
+-- | Drop the arguments ("args") from this CliOpts' rawopts field.
+cliOptsDropArgs :: CliOpts -> CliOpts
+cliOptsDropArgs copts@CliOpts{rawopts_} = copts{rawopts_ = dropRawOpt "args" rawopts_}
+
 -- | A helper for addon commands: this parses options and arguments from
 -- the current command line using the given hledger-style cmdargs mode,
 -- and returns a CliOpts. Or, with --help or -h present, it prints