cli: Commands.Balance.registerQueryUrl: correctly escape URL using modern-uri package

hledger/Hledger/Cli/Commands/Balance.hs

@@ -238,6 +238,7 @@ Currently, empty cells show 0.
 {-# LANGUAGE RecordWildCards      #-}
 {-# LANGUAGE ScopedTypeVariables  #-}
 {-# LANGUAGE TemplateHaskell      #-}
+{-# LANGUAGE QuasiQuotes          #-}
 
 module Hledger.Cli.Commands.Balance (
   -- ** balance command
@@ -283,6 +284,8 @@ import Data.Time (addDays, fromGregorian)
 import System.Console.CmdArgs.Explicit as C (flagNone, flagReq, flagOpt)
 import Lucid as L hiding (value_)
 import Safe (headMay, maximumMay)
+import qualified Text.URI as Uri
+import qualified Text.URI.QQ as UriQQ
 import Text.Tabular.AsciiWide
     (Header(..), Align(..), Properties(..), Cell(..), Table(..), TableOpts(..),
     cellWidth, concatTables, renderColumns, renderRowB, renderTableByRowsB, textCell)
@@ -586,8 +589,14 @@ headerCell text =
 
 registerQueryUrl :: [Text] -> Text
 registerQueryUrl query =
-    "register?q=" <>
+    Uri.render $
-    T.intercalate "+" (map quoteIfSpaced $ filter (not . T.null) query)
+    [UriQQ.uri|register|] {
+        Uri.uriQuery =
+            [Uri.QueryParam [UriQQ.queryKey|q|] $
+             fromMaybe (error "register URI query construction failed") $
+             Uri.mkQueryValue $ T.unwords $
+             map quoteIfSpaced $ filter (not . T.null) query]
+    }
 
 -- cf. Web.Widget.Common
 removeDates :: [Text] -> [Text]

hledger/hledger.cabal

@@ -172,6 +172,7 @@ library
     , math-functions >=0.3.3.0
     , megaparsec >=7.0.0 && <9.7
     , microlens >=0.4
+    , modern-uri >=0.3
     , mtl >=2.2.1
     , process
     , regex-tdfa

hledger/package.yaml

@@ -205,6 +205,7 @@ library:
   - Diff >=0.2
   - hashable >=1.2.4
   - lucid
+  - modern-uri >=0.3
 
 executables:
   hledger: