diff --git a/CHANGES b/CHANGES
new file mode 100644
--- /dev/null
+++ b/CHANGES
@@ -0,0 +1,27 @@
+User-visible changes in hledger-ui.
+See also hledger's change log.
+
+0.27 (unreleased)
+
+- hledger-ui is a new curses-style UI, intended to be a standard part
+  of the hledger toolset for all users (except on native MS Windows,
+  where the vty lib is not yet supported).
+
+    The UI is quite simple, allowing just browsing of accounts and
+  transactions, but it has a number of improvements over the old
+  hledger-vty, which it replaces:
+
+    - adapts to screen size
+    - handles wide characters
+    - shows multi-commodity amounts on one line
+    - manages cursor and scroll position better
+    - allows depth adjustment
+    - allows --flat toggle
+    - allows --cleared toggle
+    - allows journal reloading
+    - shows a more useful transaction register, like hledger-web
+    - offers multiple color themes
+    - includes some built-in help
+
+    hledger-ui is built with brick, a new higher-level UI library based
+  on vty, making it relatively easy to grow and maintain.
diff --git a/Hledger/UI.hs b/Hledger/UI.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI.hs
@@ -0,0 +1,23 @@
+{-|
+Re-export the modules of the hledger-ui program.
+-}
+
+module Hledger.UI (
+                     module Hledger.UI.Main,
+                     module Hledger.UI.UIOptions,
+                     module Hledger.UI.Theme,
+                     tests_Hledger_UI
+              )
+where
+import Test.HUnit
+
+import Hledger.UI.Main
+import Hledger.UI.UIOptions
+import Hledger.UI.Theme
+
+tests_Hledger_UI :: Test
+tests_Hledger_UI = TestList
+ [
+ --  tests_Hledger_UI_Main
+ --  tests_Hledger_UI_UIOptions
+ ]
diff --git a/Hledger/UI/AccountsScreen.hs b/Hledger/UI/AccountsScreen.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI/AccountsScreen.hs
@@ -0,0 +1,309 @@
+-- The accounts screen, showing accounts and balances like the CLI balance command.
+
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+
+module Hledger.UI.AccountsScreen
+ (screen
+ ,initAccountsScreen
+ ,asSetSelectedAccount
+ )
+where
+
+import Control.Lens ((^.))
+-- import Control.Monad
+import Control.Monad.IO.Class (liftIO)
+-- import Data.Default
+import Data.List
+import Data.Maybe
+import Data.Monoid
+import Data.Time.Calendar (Day)
+import System.FilePath (takeFileName)
+import qualified Data.Vector as V
+import Graphics.Vty as Vty
+import Brick
+import Brick.Widgets.List
+import Brick.Widgets.Border (borderAttr)
+-- import Brick.Widgets.Center
+
+import Hledger
+import Hledger.Cli hiding (progname,prognameandversion,green)
+-- import Hledger.Cli.CliOptions (defaultBalanceLineFormat)
+import Hledger.UI.UIOptions
+-- import Hledger.UI.Theme
+import Hledger.UI.UITypes
+import Hledger.UI.UIUtils
+import qualified Hledger.UI.RegisterScreen as RS (screen, rsSetCurrentAccount)
+import qualified Hledger.UI.ErrorScreen as ES (screen)
+
+screen = AccountsScreen{
+   asState   = (list "accounts" V.empty 1, "")
+  ,sInitFn   = initAccountsScreen
+  ,sDrawFn   = drawAccountsScreen
+  ,sHandleFn = handleAccountsScreen
+  }
+
+asSetSelectedAccount a scr@AccountsScreen{asState=(l,_)} = scr{asState=(l,a)}
+asSetSelectedAccount _ scr = scr
+
+initAccountsScreen :: Day -> AppState -> AppState
+initAccountsScreen d st@AppState{
+  aopts=uopts@UIOpts{cliopts_=copts@CliOpts{reportopts_=ropts}},
+  ajournal=j,
+  aScreen=s@AccountsScreen{asState=(_,selacct)}
+  } =
+  st{aopts=uopts', aScreen=s{asState=(l',selacct)}}
+   where
+    l = list (Name "accounts") (V.fromList displayitems) 1
+
+    -- keep the selection near the last known selected account if possible
+    l' | null selacct = l
+       | otherwise = maybe l (flip listMoveTo l) midx
+      where
+        midx = findIndex (\((a,_,_),_) -> a==selacctclipped) items
+        selacctclipped = case depth_ ropts of
+                          Nothing -> selacct
+                          Just d  -> clipAccountName d selacct
+
+    uopts' = uopts{cliopts_=copts{reportopts_=ropts'}}
+    ropts' = ropts {
+      -- XXX balanceReport doesn't respect this yet
+      balancetype_=HistoricalBalance
+      }
+
+    q = queryFromOpts d ropts
+
+    -- maybe convert balances to market value
+    convert | value_ ropts' = balanceReportValue j valuedate
+            | otherwise    = id
+      where
+        valuedate = fromMaybe d $ queryEndDate False q
+
+    -- run the report
+    (items,_total) = convert $ balanceReport ropts' q j
+
+    -- pre-render the list items
+    displayitem ((fullacct, shortacct, indent), bal) =
+      (indent
+      ,fullacct
+      ,if flat_ ropts' then fullacct else shortacct
+      ,map showAmountWithoutPrice amts -- like showMixedAmountOneLineWithoutPrice
+      )
+      where
+        Mixed amts = normaliseMixedAmountSquashPricesForDisplay $ stripPrices bal
+        stripPrices (Mixed as) = Mixed $ map stripprice as where stripprice a = a{aprice=NoPrice}
+    displayitems = map displayitem items
+
+
+initAccountsScreen _ _ = error "init function called with wrong screen type, should not happen"
+
+drawAccountsScreen :: AppState -> [Widget]
+drawAccountsScreen _st@AppState{aopts=uopts, ajournal=j, aScreen=AccountsScreen{asState=(l,_)}} =
+  [ui]
+    where
+      toplabel = files
+              <+> str " accounts"
+              <+> borderQueryStr querystr
+              <+> cleared
+              <+> borderDepthStr mdepth
+              <+> str " ("
+              <+> cur
+              <+> str "/"
+              <+> total
+              <+> str ")"
+      files = case journalFilePaths j of
+                     [] -> str ""
+                     f:_ -> withAttr ("border" <> "bold") $ str $ takeFileName f
+                     -- [f,_:[]] -> (withAttr ("border" <> "bold") $ str $ takeFileName f) <+> str " (& 1 included file)"
+                     -- f:fs  -> (withAttr ("border" <> "bold") $ str $ takeFileName f) <+> str (" (& " ++ show (length fs) ++ " included files)")
+      querystr = query_ $ reportopts_ $ cliopts_ uopts
+      mdepth = depth_ $ reportopts_ $ cliopts_ uopts
+      cleared = if (cleared_ $ reportopts_ $ cliopts_ uopts)
+                then str " with " <+> withAttr (borderAttr <> "query") (str "cleared") <+> str " txns"
+                else str ""
+      cur = str (case l^.listSelectedL of
+                  Nothing -> "-"
+                  Just i -> show (i + 1))
+      total = str $ show $ V.length $ l^.listElementsL
+
+      bottomlabel = borderKeysStr [
+         -- ("up/down/pgup/pgdown/home/end", "move")
+         ("-=1234567890", "depth")
+        ,("F", "flat?")
+        ,("C", "cleared?")
+        ,("right/enter", "register")
+        ,("g", "reload")
+        ,("q", "quit")
+        ]
+
+      ui = Widget Greedy Greedy $ do
+        c <- getContext
+        let
+          availwidth =
+            -- ltrace "availwidth" $
+            c^.availWidthL
+            - 2 -- XXX due to margin ? shouldn't be necessary (cf UIUtils)
+          displayitems = listElements l
+          maxacctwidthseen =
+            -- ltrace "maxacctwidthseen" $
+            V.maximum $
+            V.map (\(indent,_,displayacct,_) -> indent*2 + strWidth displayacct) $
+            -- V.filter (\(indent,_,_,_) -> (indent-1) <= fromMaybe 99999 mdepth) $
+            displayitems
+          maxbalwidthseen =
+            -- ltrace "maxbalwidthseen" $
+            V.maximum $ V.map (\(_,_,_,amts) -> sum (map strWidth amts) + 2 * (length amts-1)) displayitems
+          maxbalwidth =
+            -- ltrace "maxbalwidth" $
+            max 0 (availwidth - 2 - 4) -- leave 2 whitespace plus least 4 for accts
+          balwidth =
+            -- ltrace "balwidth" $
+            min maxbalwidth maxbalwidthseen
+          maxacctwidth =
+            -- ltrace "maxacctwidth" $
+            availwidth - 2 - balwidth
+          acctwidth =
+            -- ltrace "acctwidth" $
+            min maxacctwidth maxacctwidthseen
+
+          -- XXX how to minimise the balance column's jumping around
+          -- as you change the depth limit ?
+
+          colwidths = (acctwidth, balwidth)
+
+        render $ defaultLayout toplabel bottomlabel $ renderList l (drawAccountsItem colwidths)
+
+drawAccountsScreen _ = error "draw function called with wrong screen type, should not happen"
+
+drawAccountsItem :: (Int,Int) -> Bool -> (Int, String, String, [String]) -> Widget
+drawAccountsItem (acctwidth, balwidth) selected (indent, _fullacct, displayacct, balamts) =
+  Widget Greedy Fixed $ do
+    -- c <- getContext
+      -- let showitem = intercalate "\n" . balanceReportItemAsText defreportopts fmt
+    render $
+      addamts balamts $
+      str (fitString (Just acctwidth) (Just acctwidth) True True $ replicate (2*indent) ' ' ++ displayacct) <+>
+      str "  " <+>
+      str (balspace balamts)
+      where
+        balspace as = replicate n ' '
+          where n = max 0 (balwidth - (sum (map strWidth as) + 2 * (length as - 1)))
+        addamts :: [String] -> Widget -> Widget
+        addamts [] w = w
+        addamts [a] w = (<+> renderamt a) w
+        -- foldl' :: (b -> a -> b) -> b -> t a -> b
+        -- foldl' (Widget -> String -> Widget) -> Widget -> [String] -> Widget
+        addamts (a:as) w = foldl' addamt (addamts [a] w) as
+        addamt :: Widget -> String -> Widget
+        addamt w a = ((<+> renderamt a) . (<+> str ", ")) w
+        renderamt :: String -> Widget
+        renderamt a | '-' `elem` a = withAttr (sel $ "list" <> "balance" <> "negative") $ str a
+                    | otherwise    = withAttr (sel $ "list" <> "balance" <> "positive") $ str a
+        sel | selected  = (<> "selected")
+            | otherwise = id
+
+handleAccountsScreen :: AppState -> Vty.Event -> EventM (Next AppState)
+handleAccountsScreen st@AppState{
+   aScreen=scr@AccountsScreen{asState=(l,selacct)}
+  ,ajournal=j
+  } e = do
+    d <- liftIO getCurrentDay
+    -- c <- getContext
+    -- let h = c^.availHeightL
+    --     moveSel n l = listMoveBy n l
+
+    -- before we go anywhere, remember the currently selected account.
+    -- (This is preserved across screen changes, unlike List's selection state)
+    let
+      selacct' = case listSelectedElement l of
+                  Just (_, (_, fullacct, _, _)) -> fullacct
+                  Nothing -> selacct
+      st' = st{aScreen=scr{asState=(l,selacct')}}
+
+    case e of
+        Vty.EvKey Vty.KEsc []        -> halt st'
+        Vty.EvKey (Vty.KChar 'q') [] -> halt st'
+        -- Vty.EvKey (Vty.KChar 'l') [Vty.MCtrl] -> do
+
+        Vty.EvKey (Vty.KChar 'g') [] -> do
+          ej <- liftIO $ journalReload j  -- (ej, changed) <- liftIO $ journalReloadIfChanged copts j
+          case ej of
+            Right j' -> continue $ reload j' d st'
+            Left err -> continue $ screenEnter d ES.screen{esState=err} st'
+
+        Vty.EvKey (Vty.KChar '-') [] -> continue $ reload j d $ decDepth st'
+        Vty.EvKey (Vty.KChar '+') [] -> continue $ reload j d $ incDepth st'
+        Vty.EvKey (Vty.KChar '=') [] -> continue $ reload j d $ incDepth st'
+        Vty.EvKey (Vty.KChar '1') [] -> continue $ reload j d $ setDepth 1 st'
+        Vty.EvKey (Vty.KChar '2') [] -> continue $ reload j d $ setDepth 2 st'
+        Vty.EvKey (Vty.KChar '3') [] -> continue $ reload j d $ setDepth 3 st'
+        Vty.EvKey (Vty.KChar '4') [] -> continue $ reload j d $ setDepth 4 st'
+        Vty.EvKey (Vty.KChar '5') [] -> continue $ reload j d $ setDepth 5 st'
+        Vty.EvKey (Vty.KChar '6') [] -> continue $ reload j d $ setDepth 6 st'
+        Vty.EvKey (Vty.KChar '7') [] -> continue $ reload j d $ setDepth 7 st'
+        Vty.EvKey (Vty.KChar '8') [] -> continue $ reload j d $ setDepth 8 st'
+        Vty.EvKey (Vty.KChar '9') [] -> continue $ reload j d $ setDepth 9 st'
+        Vty.EvKey (Vty.KChar '0') [] -> continue $ reload j d $ setDepth 0 st'
+        Vty.EvKey (Vty.KChar 'F') [] -> continue $ reload j d $ stToggleFlat st'
+        Vty.EvKey (Vty.KChar 'C') [] -> continue $ reload j d $ stToggleCleared st'
+        Vty.EvKey (Vty.KLeft) []     -> continue $ popScreen st'
+        Vty.EvKey (k) [] | k `elem` [Vty.KRight, Vty.KEnter] -> do
+          let
+            scr = RS.rsSetCurrentAccount selacct' RS.screen
+            st'' = screenEnter d scr st'
+          vScrollToBeginning $ viewportScroll "register"
+          continue st''
+
+        -- fall through to the list's event handler (handles up/down)
+        ev                       -> do
+                                     l' <- handleEvent ev l
+                                     continue $ st'{aScreen=scr{asState=(l',selacct')}}
+                                 -- continue =<< handleEventLensed st' someLens ev
+handleAccountsScreen _ _ = error "event handler called with wrong screen type, should not happen"
+
+stToggleFlat :: AppState -> AppState
+stToggleFlat st@AppState{aopts=uopts@UIOpts{cliopts_=copts@CliOpts{reportopts_=ropts}}} =
+  st{aopts=uopts{cliopts_=copts{reportopts_=toggleFlatMode ropts}}}
+
+-- | Toggle between flat and tree mode. If in the third "default" mode, go to flat mode.
+toggleFlatMode :: ReportOpts -> ReportOpts
+toggleFlatMode ropts@ReportOpts{accountlistmode_=ALFlat} = ropts{accountlistmode_=ALTree}
+toggleFlatMode ropts = ropts{accountlistmode_=ALFlat}
+
+-- | Get the maximum account depth in the current journal.
+maxDepth :: AppState -> Int
+maxDepth AppState{ajournal=j} = maximum $ map accountNameLevel $ journalAccountNames j
+
+-- | Decrement the current depth limit towards 0. If there was no depth limit,
+-- set it to one less than the maximum account depth.
+decDepth :: AppState -> AppState
+decDepth st@AppState{aopts=uopts@UIOpts{cliopts_=copts@CliOpts{reportopts_=ropts@ReportOpts{..}}}}
+  = st{aopts=uopts{cliopts_=copts{reportopts_=ropts{depth_=dec depth_}}}}
+  where
+    dec (Just d) = Just $ max 0 (d-1)
+    dec Nothing  = Just $ maxDepth st - 1
+
+-- | Increment the current depth limit. If this makes it equal to the
+-- the maximum account depth, remove the depth limit.
+incDepth :: AppState -> AppState
+incDepth st@AppState{aopts=uopts@UIOpts{cliopts_=copts@CliOpts{reportopts_=ropts@ReportOpts{..}}}}
+  = st{aopts=uopts{cliopts_=copts{reportopts_=ropts{depth_=inc depth_}}}}
+  where
+    inc (Just d) | d < (maxDepth st - 1) = Just $ d+1
+    inc _ = Nothing
+
+-- | Set the current depth limit to the specified depth, which should
+-- be a positive number.  If it is zero, or equal to or greater than the
+-- current maximum account depth, the depth limit will be removed.
+-- (Slight inconsistency here: zero is currently a valid display depth
+-- which can be reached using the - key.  But we need a key to remove
+-- the depth limit, and 0 is it.)
+setDepth :: Int -> AppState -> AppState
+setDepth depth st@AppState{aopts=uopts@UIOpts{cliopts_=copts@CliOpts{reportopts_=ropts}}}
+  = st{aopts=uopts{cliopts_=copts{reportopts_=ropts{depth_=mdepth'}}}}
+  where
+    mdepth' | depth < 0            = depth_ ropts
+            | depth == 0           = Nothing
+            | depth >= maxDepth st = Nothing
+            | otherwise            = Just depth
+
diff --git a/Hledger/UI/ErrorScreen.hs b/Hledger/UI/ErrorScreen.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI/ErrorScreen.hs
@@ -0,0 +1,125 @@
+-- The error screen, showing a current error condition (such as a parse error after reloading the journal)
+
+{-# LANGUAGE OverloadedStrings, FlexibleContexts #-}
+
+module Hledger.UI.ErrorScreen
+ (screen)
+where
+
+-- import Control.Lens ((^.))
+import Control.Monad.IO.Class (liftIO)
+import Data.Monoid
+-- import Data.Maybe
+import Data.Time.Calendar (Day)
+import Graphics.Vty as Vty
+import Brick
+-- import Brick.Widgets.List
+-- import Brick.Widgets.Border
+-- import Brick.Widgets.Border.Style
+-- import Brick.Widgets.Center
+-- import Text.Printf
+
+-- import Hledger
+import Hledger.Cli hiding (progname,prognameandversion,green)
+import Hledger.UI.UIOptions
+-- import Hledger.UI.Theme
+import Hledger.UI.UITypes
+import Hledger.UI.UIUtils
+
+screen = ErrorScreen{
+   esState  = ""
+  ,sInitFn    = initErrorScreen
+  ,sDrawFn    = drawErrorScreen
+  ,sHandleFn = handleErrorScreen
+  }
+
+initErrorScreen :: Day -> AppState -> AppState
+initErrorScreen _ st@AppState{aScreen=ErrorScreen{}} = st
+initErrorScreen _ _ = error "init function called with wrong screen type, should not happen"
+
+drawErrorScreen :: AppState -> [Widget]
+drawErrorScreen AppState{ -- aopts=_uopts@UIOpts{cliopts_=_copts@CliOpts{reportopts_=_ropts@ReportOpts{query_=querystr}}},
+                             aScreen=ErrorScreen{esState=err}} = [ui]
+  where
+    toplabel = withAttr ("border" <> "bold") (str "Oops. Please fix this problem then press g to reload")
+            -- <+> str " transactions"
+            -- <+> borderQueryStr querystr -- no, account transactions report shows all transactions in the acct ?
+            -- <+> str " and subs"
+    --         <+> str " ("
+    --         <+> cur
+    --         <+> str "/"
+    --         <+> total
+    --         <+> str ")"
+    -- cur = str $ case l^.listSelectedL of
+    --              Nothing -> "-"
+    --              Just i -> show (i + 1)
+    -- total = str $ show $ length displayitems
+    -- displayitems = V.toList $ l^.listElementsL
+    bottomlabel = borderKeysStr [
+       -- ("up/down/pgup/pgdown/home/end", "move")
+       ("g", "reload")
+      -- ,("left", "return to accounts")
+      ]
+
+
+    -- query = query_ $ reportopts_ $ cliopts_ opts
+
+    ui = Widget Greedy Greedy $ do
+
+      -- calculate column widths, based on current available width
+      -- c <- getContext
+      -- let
+      --   totalwidth = c^.availWidthL
+      --                - 2 -- XXX due to margin ? shouldn't be necessary (cf UIUtils)
+
+      render $ defaultLayout toplabel bottomlabel $ withAttr "error" $ str err
+
+drawErrorScreen _ = error "draw function called with wrong screen type, should not happen"
+
+-- drawErrorItem :: (Int,Int,Int,Int,Int) -> Bool -> (String,String,String,String,String) -> Widget
+-- drawErrorItem (datewidth,descwidth,acctswidth,changewidth,balwidth) selected (date,desc,accts,change,bal) =
+--   Widget Greedy Fixed $ do
+--     render $
+--       str (fitString (Just datewidth) (Just datewidth) True True date) <+>
+--       str "  " <+>
+--       str (fitString (Just descwidth) (Just descwidth) True True desc) <+>
+--       str "  " <+>
+--       str (fitString (Just acctswidth) (Just acctswidth) True True accts) <+>
+--       str "   " <+>
+--       withAttr changeattr (str (fitString (Just changewidth) (Just changewidth) True False change)) <+>
+--       str "   " <+>
+--       withAttr balattr (str (fitString (Just balwidth) (Just balwidth) True False bal))
+--   where
+--     changeattr | '-' `elem` change = sel $ "list" <> "amount" <> "decrease"
+--                | otherwise         = sel $ "list" <> "amount" <> "increase"
+--     balattr    | '-' `elem` bal    = sel $ "list" <> "balance" <> "negative"
+--                | otherwise         = sel $ "list" <> "balance" <> "positive"
+--     sel | selected  = (<> "selected")
+--         | otherwise = id
+
+handleErrorScreen :: AppState -> Vty.Event -> EventM (Next AppState)
+handleErrorScreen st@AppState{
+   aScreen=s@ErrorScreen{esState=_err}
+  ,aopts=UIOpts{cliopts_=_copts}
+  ,ajournal=j
+  } e = do
+  case e of
+    Vty.EvKey Vty.KEsc []        -> halt st
+    Vty.EvKey (Vty.KChar 'q') [] -> halt st
+
+    Vty.EvKey (Vty.KChar 'g') [] -> do
+      d <- liftIO getCurrentDay
+      ej <- liftIO $ journalReload j -- (ej, changed) <- liftIO $ journalReloadIfChanged copts j
+      case ej of
+        Left err -> continue st{aScreen=s{esState=err}} -- show latest parse error
+        Right j' -> continue $ reload j' d $ popScreen st  -- return to previous screen, and reload it
+
+    -- Vty.EvKey (Vty.KLeft) []     -> continue $ popScreen st
+    -- Vty.EvKey (Vty.KRight) []    -> error (show curItem) where curItem = listSelectedElement is
+    -- fall through to the list's event handler (handles [pg]up/down)
+    _                       -> do continue st
+                                 -- is' <- handleEvent ev is
+                                 -- continue st{aScreen=s{rsState=is'}}
+                                 -- continue =<< handleEventLensed st someLens e
+handleErrorScreen _ _ = error "event handler called with wrong screen type, should not happen"
+
diff --git a/Hledger/UI/Main.hs b/Hledger/UI/Main.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI/Main.hs
@@ -0,0 +1,137 @@
+{-|
+hledger-ui - a hledger add-on providing a curses-style interface.
+Copyright (c) 2007-2015 Simon Michael <simon@joyful.com>
+Released under GPL version 3 or later.
+-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+
+module Hledger.UI.Main where
+
+-- import Control.Applicative
+-- import Control.Lens ((^.))
+import Control.Monad
+-- import Control.Monad.IO.Class (liftIO)
+-- import Data.Default
+-- import Data.Monoid              -- 
+import Data.List
+import Data.Maybe
+-- import Data.Time.Calendar
+import Safe
+import System.Exit
+
+import qualified Graphics.Vty as V
+import Brick
+
+import Hledger
+import Hledger.Cli hiding (progname,prognameandversion,green)
+import Hledger.UI.UIOptions
+import Hledger.UI.UITypes
+-- import Hledger.UI.UIUtils
+import Hledger.UI.Theme
+import Hledger.UI.AccountsScreen as AS
+import Hledger.UI.RegisterScreen as RS
+
+----------------------------------------------------------------------
+
+main :: IO ()
+main = do
+  opts <- getHledgerUIOpts
+  -- when (debug_ $ cliopts_ opts) $ printf "%s\n" prognameandversion >> printf "opts: %s\n" (show opts)
+  run opts
+    where
+      run opts
+        | "help" `inRawOpts` (rawopts_ $ cliopts_ opts)            = putStr (showModeHelp uimode) >> exitSuccess
+        | "version" `inRawOpts` (rawopts_ $ cliopts_ opts)         = putStrLn prognameandversion >> exitSuccess
+        | "binary-filename" `inRawOpts` (rawopts_ $ cliopts_ opts) = putStrLn (binaryfilename progname)
+        | otherwise                                                = withJournalDoUICommand opts runBrickUi
+
+-- XXX withJournalDo specialised for UIOpts
+withJournalDoUICommand :: UIOpts -> (UIOpts -> Journal -> IO ()) -> IO ()
+withJournalDoUICommand uopts@UIOpts{cliopts_=copts} cmd = do
+  rulespath <- rulesFilePathFromOpts copts
+  journalpath <- journalFilePathFromOpts copts
+  ej <- readJournalFiles Nothing rulespath (not $ ignore_assertions_ copts) journalpath
+  either error' (cmd uopts . journalApplyAliases (aliasesFromOpts copts)) ej
+
+runBrickUi :: UIOpts -> Journal -> IO ()
+runBrickUi uopts@UIOpts{cliopts_=copts@CliOpts{reportopts_=ropts}} j = do
+  d <- getCurrentDay
+
+  let
+
+    -- depth: is a bit different from other queries. In hledger cli,
+    -- - reportopts{depth_} indicates --depth options
+    -- - reportopts{query_} is the query arguments as a string
+    -- - the report query is based on both of these.
+    -- For hledger-ui, for now, move depth: arguments out of reportopts{query_}
+    -- and into reportopts{depth_}, so that depth and other kinds of filter query
+    -- can be displayed independently.
+    uopts' = uopts{
+      cliopts_=copts{
+         reportopts_= ropts{
+            -- ensure depth_ also reflects depth: args
+            depth_=depthfromoptsandargs,
+            -- remove depth: args from query_
+            query_=unwords $ -- as in ReportOptions, with same limitations
+                   [v | (k,v) <- rawopts_ copts, k=="args", not $ "depth" `isPrefixOf` v]
+            }
+         }
+      }
+      where
+        q = queryFromOpts d ropts
+        depthfromoptsandargs = case queryDepth q of 99999 -> Nothing
+                                                    d     -> Just d
+
+    -- XXX move this stuff into Options, UIOpts
+    theme = maybe defaultTheme (fromMaybe defaultTheme . getTheme) $
+            maybestringopt "theme" $ rawopts_ copts
+    mregister = maybestringopt "register" $ rawopts_ copts
+
+    (scr, prevscrs) = case mregister of
+      Nothing   -> (AS.screen, [])
+      -- with --register, start on the register screen, and also put
+      -- the accounts screen on the prev screens stack so you can exit
+      -- to that as usual.
+      Just apat -> (rsSetCurrentAccount acct RS.screen, [ascr'])
+        where
+          acct = headDef
+                 (error' $ "--register "++apat++" did not match any account")
+                 $ filter (regexMatches apat) $ journalAccountNames j
+          -- Initialising the accounts screen is awkward, requiring
+          -- another temporary AppState value..
+          ascr' = aScreen $
+                  AS.initAccountsScreen d $
+                  AppState{
+                    aopts=uopts'
+                   ,ajournal=j
+                   ,aScreen=asSetSelectedAccount acct AS.screen
+                   ,aPrevScreens=[]
+                   }
+  
+    st = (sInitFn scr) d
+         AppState{
+            aopts=uopts'
+           ,ajournal=j
+           ,aScreen=scr
+           ,aPrevScreens=prevscrs
+           }
+         
+    app :: App (AppState) V.Event
+    app = App {
+        appLiftVtyEvent = id
+      , appStartEvent   = return
+      , appAttrMap      = const theme
+      , appChooseCursor = showFirstCursor
+      , appHandleEvent  = \st ev -> sHandleFn (aScreen st) st ev
+      , appDraw         = \st -> sDrawFn (aScreen st) st
+         -- XXX bizarro. removing the st arg and parameter above,
+         -- which according to GHCI does not change the type,
+         -- causes "Exception: draw function called with wrong screen type"
+         -- on entering a register. Likewise, removing the st ev args and parameters
+         -- causes an exception on exiting a register.
+      }
+
+  void $ defaultMain app st
+
diff --git a/Hledger/UI/RegisterScreen.hs b/Hledger/UI/RegisterScreen.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI/RegisterScreen.hs
@@ -0,0 +1,233 @@
+-- The account register screen, showing transactions in an account, like hledger-web's register.
+
+{-# LANGUAGE OverloadedStrings, FlexibleContexts #-}
+
+module Hledger.UI.RegisterScreen
+ (screen
+ ,rsSetCurrentAccount
+ )
+where
+
+import Control.Lens ((^.))
+import Control.Monad.IO.Class (liftIO)
+import Data.List
+import Data.List.Split (splitOn)
+import Data.Monoid
+-- import Data.Maybe
+import Data.Time.Calendar (Day)
+import qualified Data.Vector as V
+import Graphics.Vty as Vty
+import Brick
+import Brick.Widgets.List
+import Brick.Widgets.Border (borderAttr)
+-- import Brick.Widgets.Center
+-- import Text.Printf
+
+import Hledger
+import Hledger.Cli hiding (progname,prognameandversion,green)
+import Hledger.UI.UIOptions
+-- import Hledger.UI.Theme
+import Hledger.UI.UITypes
+import Hledger.UI.UIUtils
+import qualified Hledger.UI.TransactionScreen as TS (screen)
+import qualified Hledger.UI.ErrorScreen as ES (screen)
+
+screen = RegisterScreen{
+   rsState   = (list "register" V.empty 1, "")
+  ,sInitFn   = initRegisterScreen
+  ,sDrawFn   = drawRegisterScreen
+  ,sHandleFn = handleRegisterScreen
+  }
+
+rsSetCurrentAccount a scr@RegisterScreen{rsState=(l,_)} = scr{rsState=(l,a)}
+rsSetCurrentAccount _ scr = scr
+
+initRegisterScreen :: Day -> AppState -> AppState
+initRegisterScreen d st@AppState{aopts=opts, ajournal=j, aScreen=s@RegisterScreen{rsState=(_,acct)}} =
+  st{aScreen=s{rsState=(l,acct)}}
+  where
+    -- gather arguments and queries
+    ropts = (reportopts_ $ cliopts_ opts)
+            {
+              depth_=Nothing,
+              balancetype_=HistoricalBalance
+            }
+    -- XXX temp
+    thisacctq = Acct $ accountNameToAccountRegex acct -- includes subs
+    q = filterQuery (not . queryIsDepth) $ queryFromOpts d ropts
+
+    -- run a transactions report, most recent last
+    q' =
+      -- ltrace "q"
+      q
+    thisacctq' =
+      -- ltrace "thisacctq"
+      thisacctq
+    (_label,items') = accountTransactionsReport ropts j q' thisacctq'
+    items = reverse items'
+
+    -- pre-render all items; these will be the List elements. This helps calculate column widths.
+    displayitem (t, _, _issplit, otheracctsstr, change, bal) =
+      (showDate $ tdate t
+      ,tdescription t
+      ,case splitOn ", " otheracctsstr of
+        [s] -> s
+        ss  -> intercalate ", " ss
+        -- _   -> "<split>"  -- should do this if accounts field width < 30
+      ,showMixedAmountOneLineWithoutPrice change
+      ,showMixedAmountOneLineWithoutPrice bal
+      ,t
+      )
+    displayitems = map displayitem items
+
+    -- build the List, moving the selection to the end
+    l = listMoveTo (length items) $
+        list (Name "register") (V.fromList displayitems) 1
+
+        -- (listName someList)
+
+initRegisterScreen _ _ = error "init function called with wrong screen type, should not happen"
+
+drawRegisterScreen :: AppState -> [Widget]
+drawRegisterScreen AppState{aopts=uopts -- @UIOpts{cliopts_=_copts@CliOpts{reportopts_=_ropts@ReportOpts{query_=querystr}}
+                           ,aScreen=RegisterScreen{rsState=(l,acct)}} = [ui]
+  where
+    toplabel = withAttr ("border" <> "bold") (str acct)
+            <+> cleared
+            <+> str " transactions"
+            -- <+> borderQueryStr querystr -- no, account transactions report shows all transactions in the acct ?
+            -- <+> str " and subs"
+            <+> str " ("
+            <+> cur
+            <+> str "/"
+            <+> total
+            <+> str ")"
+    cleared = if (cleared_ $ reportopts_ $ cliopts_ uopts)
+              then withAttr (borderAttr <> "query") (str " cleared")
+              else str ""
+    cur = str $ case l^.listSelectedL of
+                 Nothing -> "-"
+                 Just i -> show (i + 1)
+    total = str $ show $ length displayitems
+    displayitems = V.toList $ l^.listElementsL
+
+    -- query = query_ $ reportopts_ $ cliopts_ opts
+
+    ui = Widget Greedy Greedy $ do
+
+      -- calculate column widths, based on current available width
+      c <- getContext
+      let
+        totalwidth = c^.availWidthL
+                     - 2 -- XXX due to margin ? shouldn't be necessary (cf UIUtils)
+
+        -- the date column is fixed width
+        datewidth = 10
+
+        -- multi-commodity amounts rendered on one line can be
+        -- arbitrarily wide.  Give the two amounts as much space as
+        -- they need, while reserving a minimum of space for other
+        -- columns and whitespace.  If they don't get all they need,
+        -- allocate it to them proportionally to their maximum widths.
+        whitespacewidth = 10 -- inter-column whitespace, fixed width
+        minnonamtcolswidth = datewidth + 2 + 2 -- date column plus at least 2 for desc and accts
+        maxamtswidth = max 0 (totalwidth - minnonamtcolswidth - whitespacewidth)
+        maxchangewidthseen = maximum' $ map (strWidth . fourth6) displayitems
+        maxbalwidthseen = maximum' $ map (strWidth . fifth6) displayitems
+        changewidthproportion = fromIntegral maxchangewidthseen / fromIntegral (maxchangewidthseen + maxbalwidthseen)
+        maxchangewidth = round $ changewidthproportion * fromIntegral maxamtswidth
+        maxbalwidth = maxamtswidth - maxchangewidth
+        changewidth = min maxchangewidth maxchangewidthseen 
+        balwidth = min maxbalwidth maxbalwidthseen
+
+        -- assign the remaining space to the description and accounts columns
+        -- maxdescacctswidth = totalwidth - (whitespacewidth - 4) - changewidth - balwidth
+        maxdescacctswidth =
+          -- trace (show (totalwidth, datewidth, changewidth, balwidth, whitespacewidth)) $
+          max 0 (totalwidth - datewidth - changewidth - balwidth - whitespacewidth)
+        -- allocating proportionally.
+        -- descwidth' = maximum' $ map (strWidth . second6) displayitems
+        -- acctswidth' = maximum' $ map (strWidth . third6) displayitems
+        -- descwidthproportion = (descwidth' + acctswidth') / descwidth'
+        -- maxdescwidth = min (maxdescacctswidth - 7) (maxdescacctswidth / descwidthproportion)
+        -- maxacctswidth = maxdescacctswidth - maxdescwidth
+        -- descwidth = min maxdescwidth descwidth' 
+        -- acctswidth = min maxacctswidth acctswidth'
+        -- allocating equally.
+        descwidth = maxdescacctswidth `div` 2
+        acctswidth = maxdescacctswidth - descwidth
+        colwidths = (datewidth,descwidth,acctswidth,changewidth,balwidth)
+
+        bottomlabel = borderKeysStr [
+           -- ("up/down/pgup/pgdown/home/end", "move")
+           ("left", "back")
+          ,("C", "cleared?")
+          ,("right/enter", "transaction")
+          ,("g", "reload")
+          ,("q", "quit")
+          ]
+
+      render $ defaultLayout toplabel bottomlabel $ renderList l (drawRegisterItem colwidths)
+
+drawRegisterScreen _ = error "draw function called with wrong screen type, should not happen"
+
+drawRegisterItem :: (Int,Int,Int,Int,Int) -> Bool -> (String,String,String,String,String,Transaction) -> Widget
+drawRegisterItem (datewidth,descwidth,acctswidth,changewidth,balwidth) selected (date,desc,accts,change,bal,_) =
+  Widget Greedy Fixed $ do
+    render $
+      str (fitString (Just datewidth) (Just datewidth) True True date) <+>
+      str "  " <+>
+      str (fitString (Just descwidth) (Just descwidth) True True desc) <+>
+      str "  " <+>
+      str (fitString (Just acctswidth) (Just acctswidth) True True accts) <+>
+      str "   " <+>
+      withAttr changeattr (str (fitString (Just changewidth) (Just changewidth) True False change)) <+>
+      str "   " <+>
+      withAttr balattr (str (fitString (Just balwidth) (Just balwidth) True False bal))
+  where
+    changeattr | '-' `elem` change = sel $ "list" <> "amount" <> "decrease"
+               | otherwise         = sel $ "list" <> "amount" <> "increase"
+    balattr    | '-' `elem` bal    = sel $ "list" <> "balance" <> "negative"
+               | otherwise         = sel $ "list" <> "balance" <> "positive"
+    sel | selected  = (<> "selected")
+        | otherwise = id
+
+handleRegisterScreen :: AppState -> Vty.Event -> EventM (Next AppState)
+handleRegisterScreen st@AppState{
+   aScreen=s@RegisterScreen{rsState=(l,acct)}
+  ,aopts=UIOpts{cliopts_=_copts}
+  ,ajournal=j
+  } e = do
+  d <- liftIO getCurrentDay
+  case e of
+    Vty.EvKey Vty.KEsc []        -> halt st
+    Vty.EvKey (Vty.KChar 'q') [] -> halt st
+
+    Vty.EvKey (Vty.KChar 'g') [] -> do
+      ej <- liftIO $ journalReload j  -- (ej, changed) <- liftIO $ journalReloadIfChanged copts j
+      case ej of
+        Right j' -> continue $ reload j' d st
+        Left err -> continue $ screenEnter d ES.screen{esState=err} st
+
+    Vty.EvKey (Vty.KChar 'C') [] -> continue $ reload j d $ stToggleCleared st
+
+    Vty.EvKey (Vty.KLeft) []     -> continue $ popScreen st
+
+    Vty.EvKey (k) [] | k `elem` [Vty.KRight, Vty.KEnter] -> do
+      case listSelectedElement l of
+        Just (_, (_, _, _, _, _, t)) ->
+          let
+            ts = map sixth6 $ V.toList $ listElements l
+            numberedts = zip [1..] ts
+            i = fromIntegral $ maybe 0 (+1) $ elemIndex t ts -- XXX
+          in
+            continue $ screenEnter d TS.screen{tsState=((i,t),numberedts,acct)} st
+        Nothing -> continue st
+
+    -- fall through to the list's event handler (handles [pg]up/down)
+    ev                       -> do
+                                 l' <- handleEvent ev l
+                                 continue st{aScreen=s{rsState=(l',acct)}}
+                                 -- continue =<< handleEventLensed st someLens ev
+
+handleRegisterScreen _ _ = error "event handler called with wrong screen type, should not happen"
diff --git a/Hledger/UI/Theme.hs b/Hledger/UI/Theme.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI/Theme.hs
@@ -0,0 +1,119 @@
+-- | The all-important theming engine!
+--
+-- Cf
+-- https://hackage.haskell.org/package/vty/docs/Graphics-Vty-Attributes.html
+-- http://hackage.haskell.org/package/brick/docs/Brick-AttrMap.html
+-- http://hackage.haskell.org/package/brick-0.1/docs/Brick-Util.html
+-- http://hackage.haskell.org/package/brick-0.1/docs/Brick-Widgets-Core.html#g:5
+-- http://hackage.haskell.org/package/brick-0.1/docs/Brick-Widgets-Border.html
+
+
+{-# LANGUAGE OverloadedStrings #-}
+
+module Hledger.UI.Theme (
+   defaultTheme
+  ,getTheme
+  ,themes
+  ,themeNames
+ ) where
+
+import qualified Data.Map as M
+import Data.Maybe
+import Data.Monoid
+import Graphics.Vty
+import Brick
+import Brick.Widgets.Border
+import Brick.Widgets.List
+
+defaultTheme :: AttrMap
+defaultTheme = fromMaybe (snd $ head themesList) $ getTheme "white"
+  -- the theme named here should exist;
+  -- otherwise it will take the first one from the list,
+  -- which must be non-empty.
+
+-- | Look up the named theme, if it exists.
+getTheme :: String -> Maybe AttrMap
+getTheme name = M.lookup name themes
+
+-- | A selection of named themes specifying terminal colours and styles.
+-- One of these is active at a time.
+--
+-- A hledger-ui theme is a vty/brick AttrMap.  Each theme specifies a
+-- default style (Attr), plus extra styles which are applied when
+-- their (hierarchical) name matches the widget rendering context.
+-- "More specific styles, if present, are used and only fall back to
+-- more general ones when the more specific ones are absent, but also
+-- these styles get merged, so that if a more specific style only
+-- provides the foreground color, its more general parent style can
+-- set the background color, too."
+-- For example: rendering a widget named "b" inside a widget named "a",
+-- - if a style named "a" <> "b" exists, it will be used. Anything it
+--   does not specify will be taken from a style named "a" if that
+--   exists, otherwise from the default style.
+-- - otherwise if a style named "a" exists, it will be used, and
+--   anything it does not specify will be taken from the default style.
+-- - otherwise (you guessed it) the default style is used.
+--
+themes :: M.Map String AttrMap
+themes = M.fromList themesList
+
+themeNames :: [String]
+themeNames = map fst themesList
+
+(&) = withStyle
+
+themesList :: [(String, AttrMap)]
+themesList = [
+  ("default", attrMap
+            (black `on` white & bold) [ -- default style for this theme
+              ("error", currentAttr `withForeColor` red),
+              (borderAttr       , white `on` black & dim),
+              (borderAttr <> "bold", white `on` black & bold),
+              (borderAttr <> "query", cyan `on` black & bold),
+              (borderAttr <> "depth", yellow `on` black & bold),
+              (borderAttr <> "keys", white `on` black & bold),
+              -- ("normal"                , black `on` white),
+              ("list"                  , black `on` white),      -- regular list items
+              ("list" <> "selected"    , white `on` blue & bold), -- selected list items
+              -- ("list" <> "selected"     , black `on` brightYellow),
+              -- ("list" <> "accounts"  , white `on` brightGreen),
+              ("list" <> "amount" <> "increase", currentAttr `withForeColor` green),
+              ("list" <> "amount" <> "decrease", currentAttr `withForeColor` red),
+              ("list" <> "balance" <> "positive",  currentAttr `withForeColor` black),
+              ("list" <> "balance" <> "negative", currentAttr `withForeColor` red),
+              ("list" <> "amount" <> "increase" <> "selected", brightGreen `on` blue & bold),
+              ("list" <> "amount" <> "decrease" <> "selected", brightRed `on` blue & bold),
+              ("list" <> "balance" <> "positive" <> "selected",  white `on` blue & bold),
+              ("list" <> "balance" <> "negative" <> "selected", brightRed `on` blue & bold)
+              ]),
+
+  ("terminal", attrMap
+            defAttr [  -- use the current terminal's default style
+              (borderAttr       , white `on` black),
+              -- ("normal"         , defAttr),
+              (listAttr         , defAttr),
+              (listSelectedAttr , defAttr & reverseVideo & bold)
+              -- ("status"         , defAttr & reverseVideo)
+              ]),
+
+  ("greenterm", attrMap
+            (green `on` black) [
+              -- (listAttr                  , green `on` black),
+              (listSelectedAttr          , black `on` green & bold)
+              ])
+  -- ("colorful", attrMap
+  --           defAttr [
+  --             (listAttr         , defAttr & reverseVideo),
+  --             (listSelectedAttr , defAttr `withForeColor` white `withBackColor` red)
+  --             -- ("status"         , defAttr `withForeColor` black `withBackColor` green)
+  --             ])
+
+  ]
+
+-- halfbrightattr = defAttr & dim
+-- reverseattr = defAttr & reverseVideo
+-- redattr = defAttr `withForeColor` red
+-- greenattr = defAttr `withForeColor` green
+-- reverseredattr = defAttr & reverseVideo `withForeColor` red
+-- reversegreenattr= defAttr & reverseVideo `withForeColor` green
+
diff --git a/Hledger/UI/TransactionScreen.hs b/Hledger/UI/TransactionScreen.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI/TransactionScreen.hs
@@ -0,0 +1,109 @@
+-- The transaction screen, showing a single transaction's general journal entry.
+
+{-# LANGUAGE OverloadedStrings, TupleSections #-} -- , FlexibleContexts
+
+module Hledger.UI.TransactionScreen
+ (screen
+ )
+where
+
+-- import Control.Lens ((^.))
+import Control.Monad.IO.Class (liftIO)
+-- import Data.List
+-- import Data.List.Split (splitOn)
+-- import Data.Ord
+import Data.Monoid
+-- import Data.Maybe
+import Data.Time.Calendar (Day)
+-- import qualified Data.Vector as V
+import Graphics.Vty as Vty
+-- import Safe (headDef, lastDef)
+import Brick
+import Brick.Widgets.List (listMoveTo)
+-- import Brick.Widgets.Border
+-- import Brick.Widgets.Border.Style
+-- import Brick.Widgets.Center
+-- import Text.Printf
+
+import Hledger
+import Hledger.Cli hiding (progname,prognameandversion,green)
+import Hledger.UI.UIOptions
+-- import Hledger.UI.Theme
+import Hledger.UI.UITypes
+import Hledger.UI.UIUtils
+import qualified Hledger.UI.ErrorScreen as ES (screen)
+
+screen = TransactionScreen{
+   tsState   = ((1,nulltransaction),[(1,nulltransaction)],"")
+  ,sInitFn   = initTransactionScreen
+  ,sDrawFn   = drawTransactionScreen
+  ,sHandleFn = handleTransactionScreen
+  }
+
+initTransactionScreen :: Day -> AppState -> AppState
+initTransactionScreen _d st@AppState{aopts=_opts, ajournal=_j, aScreen=_s@TransactionScreen{tsState=_}} = st
+initTransactionScreen _ _ = error "init function called with wrong screen type, should not happen"
+
+drawTransactionScreen :: AppState -> [Widget]
+drawTransactionScreen AppState{ -- aopts=_uopts@UIOpts{cliopts_=_copts@CliOpts{reportopts_=_ropts@ReportOpts{query_=querystr}}},
+                               aScreen=TransactionScreen{tsState=((i,t),nts,acct)}} = [ui]
+  where
+    -- datedesc = show (tdate t) ++ " " ++ tdescription t
+    toplabel =
+      str "Transaction "
+      -- <+> withAttr ("border" <> "bold") (str $ "#" ++ show (tindex t))
+      -- <+> str (" ("++show i++" of "++show (length nts)++" in "++acct++")")
+      <+> (str $ "#" ++ show (tindex t))
+      <+> str " ("
+      <+> withAttr ("border" <> "bold") (str $ show i)
+      <+> str (" of "++show (length nts)++" in "++acct++")")
+    bottomlabel = borderKeysStr [
+       ("left", "back")
+      ,("up/down", "prev/next")
+      ,("g", "reload")
+      ,("q", "quit")
+      ]
+    ui = Widget Greedy Greedy $ do
+      render $ defaultLayout toplabel bottomlabel $ str $ showTransactionUnelidedOneLineAmounts t
+
+drawTransactionScreen _ = error "draw function called with wrong screen type, should not happen"
+
+handleTransactionScreen :: AppState -> Vty.Event -> EventM (Next AppState)
+handleTransactionScreen st@AppState{
+   aScreen=s@TransactionScreen{tsState=((i,t),nts,acct)}
+  ,aopts=UIOpts{cliopts_=_copts}
+  ,ajournal=j
+  } e = do
+  d <- liftIO getCurrentDay
+  let
+    (iprev,tprev) = maybe (i,t) ((i-1),) $ lookup (i-1) nts
+    (inext,tnext) = maybe (i,t) ((i+1),) $ lookup (i+1) nts
+  case e of
+    Vty.EvKey Vty.KEsc []        -> halt st
+    Vty.EvKey (Vty.KChar 'q') [] -> halt st
+
+    Vty.EvKey (Vty.KChar 'g') [] -> do
+      d <- liftIO getCurrentDay
+      ej <- liftIO $ journalReload j  -- (ej, changed) <- liftIO $ journalReloadIfChanged copts j
+      case ej of
+        Right j' -> continue $ reload j' d st
+        Left err -> continue $ screenEnter d ES.screen{esState=err} st
+
+    -- Vty.EvKey (Vty.KChar 'C') [] -> continue $ reload j d $ stToggleCleared st
+
+    Vty.EvKey (Vty.KUp) []       -> continue $ reload j d st{aScreen=s{tsState=((iprev,tprev),nts,acct)}}
+    Vty.EvKey (Vty.KDown) []     -> continue $ reload j d st{aScreen=s{tsState=((inext,tnext),nts,acct)}}
+
+    Vty.EvKey (Vty.KLeft) []     -> continue st''
+      where
+        st'@AppState{aScreen=scr} = popScreen st
+        st'' = st'{aScreen=rsSetSelectedTransaction (fromIntegral i) scr}
+
+    _ev -> continue st
+
+handleTransactionScreen _ _ = error "event handler called with wrong screen type, should not happen"
+
+rsSetSelectedTransaction i scr@RegisterScreen{rsState=(l,a)} = scr{rsState=(l',a)}
+  where l' = listMoveTo (i-1) l
+rsSetSelectedTransaction _ scr = scr
+
diff --git a/Hledger/UI/UIOptions.hs b/Hledger/UI/UIOptions.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI/UIOptions.hs
@@ -0,0 +1,82 @@
+{-# LANGUAGE CPP #-}
+{-|
+
+-}
+
+module Hledger.UI.UIOptions
+where
+#if !MIN_VERSION_base(4,8,0)
+import Data.Functor.Compat ((<$>))
+#endif
+import Data.List (intercalate)
+import System.Console.CmdArgs
+import System.Console.CmdArgs.Explicit
+
+import Hledger.Cli hiding (progname,version,prognameandversion)
+import Hledger.UI.Theme (themeNames)
+
+progname, version :: String
+progname = "hledger-ui"
+#ifdef VERSION
+version = VERSION
+#else
+version = ""
+#endif
+prognameandversion :: String
+prognameandversion = progname ++ " " ++ version :: String
+
+uiflags = [
+  -- flagNone ["debug-ui"]  (\opts -> setboolopt "rules-file" opts) "run with no terminal output, showing console"
+   flagReq  ["theme"] (\s opts -> Right $ setopt "theme" s opts) "THEME" ("use this custom display theme ("++intercalate ", " themeNames++")")
+  ,flagReq  ["register"] (\s opts -> Right $ setopt "register" s opts) "ACCTREGEX" "start in the (first) matched account's register"
+  ,flagNone ["flat"] (\opts -> setboolopt "flat" opts) "show full account names, unindented"
+  -- ,flagReq ["drop"] (\s opts -> Right $ setopt "drop" s opts) "N" "with --flat, omit this many leading account name components"
+  -- ,flagReq  ["format"] (\s opts -> Right $ setopt "format" s opts) "FORMATSTR" "use this custom line format"
+  ,flagNone ["no-elide"] (\opts -> setboolopt "no-elide" opts) "don't compress empty parent accounts on one line"
+  ,flagNone ["value","V"] (setboolopt "value") "show amounts as their market value in their default valuation commodity (accounts screen)"
+ ]
+
+--uimode :: Mode [([Char], [Char])]
+uimode =  (mode "hledger-ui" [("command","ui")]
+            "browse accounts, postings and entries in a full-window curses interface"
+            (argsFlag "[PATTERNS]") []){
+              modeGroupFlags = Group {
+                                groupUnnamed = uiflags
+                               ,groupHidden = []
+                               ,groupNamed = [(generalflagsgroup1)]
+                               }
+             ,modeHelpSuffix=[
+                  -- "Reads your ~/.hledger.journal file, or another specified by $LEDGER_FILE or -f, and starts the full-window curses ui."
+                 ]
+           }
+
+-- hledger-ui options, used in hledger-ui and above
+data UIOpts = UIOpts {
+     debug_ui_ :: Bool
+    ,cliopts_   :: CliOpts
+ } deriving (Show)
+
+defuiopts = UIOpts
+    def
+    def
+
+-- instance Default CliOpts where def = defcliopts
+
+rawOptsToUIOpts :: RawOpts -> IO UIOpts
+rawOptsToUIOpts rawopts = checkUIOpts <$> do
+  cliopts <- rawOptsToCliOpts rawopts
+  return defuiopts {
+              debug_ui_ = boolopt "debug-ui" rawopts
+             ,cliopts_   = cliopts
+             }
+
+checkUIOpts :: UIOpts -> UIOpts
+checkUIOpts opts =
+  either optserror (const opts) $ do
+    case maybestringopt "theme" $ rawopts_ $ cliopts_ opts of
+      Just t | not $ elem t themeNames -> Left $ "invalid theme name: "++t
+      _                                -> Right ()
+
+getHledgerUIOpts :: IO UIOpts
+getHledgerUIOpts = processArgs uimode >>= return . decodeRawOpts >>= rawOptsToUIOpts
+
diff --git a/Hledger/UI/UITypes.hs b/Hledger/UI/UITypes.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI/UITypes.hs
@@ -0,0 +1,57 @@
+module Hledger.UI.UITypes where
+
+import Data.Time.Calendar (Day)
+import qualified Graphics.Vty as V
+import Brick
+import Brick.Widgets.List (List)
+
+import Hledger
+import Hledger.UI.UIOptions
+
+----------------------------------------------------------------------
+
+-- | hledger-ui's application state. This is part of, but distinct
+-- from, brick's App.
+data AppState = AppState {
+   aopts :: UIOpts          -- ^ the command-line options and query currently in effect
+  ,ajournal :: Journal      -- ^ the journal being viewed
+  ,aScreen :: Screen        -- ^ the currently active screen
+  ,aPrevScreens :: [Screen] -- ^ previously visited screens, most recent first
+  } deriving (Show)
+
+-- | Types of screen available within the app, along with their state.
+-- Screen types are distinguished by their constructor and their state
+-- field, which must have unique names.
+--
+-- This type causes partial functions, so take care.
+data Screen =
+    AccountsScreen {
+     asState :: (List (Int,String,String,[String]), AccountName)  -- ^ list widget holding (indent level, full account name, full or short account name to display, rendered amounts);
+                                                                  --   the full name of the currently selected account (or "")
+    ,sInitFn :: Day -> AppState -> AppState                       -- ^ function to initialise the screen's state on entry
+    ,sHandleFn :: AppState -> V.Event -> EventM (Next AppState)   -- ^ brick event handler to use for this screen
+    ,sDrawFn :: AppState -> [Widget]                              -- ^ brick renderer to use for this screen
+    }
+  | RegisterScreen {
+     rsState :: (List (String,String,String,String,String,Transaction), AccountName)
+                                                                  -- ^ list widget holding (date, description, other accts, change amt, balance amt, and the full transaction);
+                                                                  --   the full name of the account we are showing a register for
+    ,sInitFn :: Day -> AppState -> AppState
+    ,sHandleFn :: AppState -> V.Event -> EventM (Next AppState)
+    ,sDrawFn :: AppState -> [Widget]
+    }
+  | TransactionScreen {
+     tsState :: ((Integer,Transaction), [(Integer,Transaction)], AccountName)         -- ^ the (numbered) transaction we are viewing, a numbered list of transactions we can step through, and the account whose register we entered this screen from
+    ,sInitFn :: Day -> AppState -> AppState
+    ,sHandleFn :: AppState -> V.Event -> EventM (Next AppState)
+    ,sDrawFn :: AppState -> [Widget]
+    }
+  | ErrorScreen {
+     esState :: String                                            -- ^ error message to display
+    ,sInitFn :: Day -> AppState -> AppState
+    ,sHandleFn :: AppState -> V.Event -> EventM (Next AppState)
+    ,sDrawFn :: AppState -> [Widget]
+    }
+  deriving (Show)
+
+instance Show (List a) where show _ = "<List>"
diff --git a/Hledger/UI/UIUtils.hs b/Hledger/UI/UIUtils.hs
new file mode 100644
--- /dev/null
+++ b/Hledger/UI/UIUtils.hs
@@ -0,0 +1,191 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module Hledger.UI.UIUtils (
+  pushScreen
+ ,popScreen
+ ,screenEnter
+ ,reload
+ ,getViewportSize
+ -- ,margin
+ ,withBorderAttr
+ ,topBottomBorderWithLabel
+ ,topBottomBorderWithLabels
+ ,defaultLayout
+ ,borderQueryStr
+ ,borderDepthStr
+ ,borderKeysStr
+ --
+ ,stToggleCleared
+ ) where
+
+import Control.Lens ((^.))
+-- import Control.Monad
+-- import Control.Monad.IO.Class
+-- import Data.Default
+import Data.List
+import Data.Monoid
+import Data.Time.Calendar (Day)
+import Brick
+-- import Brick.Widgets.List
+import Brick.Widgets.Border
+import Brick.Widgets.Border.Style
+import Graphics.Vty as Vty
+
+import Hledger.UI.UITypes
+import Hledger.Data.Types (Journal)
+import Hledger.UI.UIOptions
+import Hledger.Cli.CliOptions
+import Hledger.Reports.ReportOptions
+import Hledger.Utils (applyN)
+-- import Hledger.Utils.Debug
+
+stToggleCleared :: AppState -> AppState
+stToggleCleared st@AppState{aopts=uopts@UIOpts{cliopts_=copts@CliOpts{reportopts_=ropts}}} =
+  st{aopts=uopts{cliopts_=copts{reportopts_=toggleCleared ropts}}}
+
+-- | Toggle between showing all and showing only cleared items.
+toggleCleared :: ReportOpts -> ReportOpts
+toggleCleared ropts = ropts{cleared_=not $ cleared_ ropts}
+
+-- | Regenerate the content for the current and previous screens, from a new journal and current date.
+reload :: Journal -> Day -> AppState -> AppState
+reload j d st@AppState{aScreen=s,aPrevScreens=ss} =
+  -- clumsy due to entanglement of AppState and Screen.
+  -- sInitFn operates only on an appstate's current screen, so
+  -- remove all the screens from the appstate and then add them back
+  -- one at a time, regenerating as we go.
+  let
+    first:rest = reverse $ s:ss
+    st0 = st{ajournal=j, aScreen=first, aPrevScreens=[]}
+    st1 = (sInitFn first) d st0
+    st2 = foldl' (\st s -> (sInitFn s) d $ pushScreen s st) st1 rest
+  in
+    st2
+
+pushScreen :: Screen -> AppState -> AppState
+pushScreen scr st = st{aPrevScreens=(aScreen st:aPrevScreens st)
+                      ,aScreen=scr
+                      }
+
+popScreen :: AppState -> AppState
+popScreen st@AppState{aPrevScreens=s:ss} = st{aScreen=s, aPrevScreens=ss}
+popScreen st = st
+
+-- clearScreens :: AppState -> AppState
+-- clearScreens st = st{aPrevScreens=[]}
+
+-- | Enter a new screen, saving the old screen & state in the
+-- navigation history and initialising the new screen's state.
+screenEnter :: Day -> Screen -> AppState -> AppState
+screenEnter d scr st = (sInitFn scr) d $
+                       pushScreen scr
+                       st
+
+-- | In the EventM monad, get the named current viewport's width and height,
+-- or (0,0) if the named viewport is not found.
+getViewportSize :: Name -> EventM (Int,Int)
+getViewportSize name = do
+  mvp <- lookupViewport name
+  let (w,h) = case mvp of
+        Just vp -> vp ^. vpSize
+        Nothing -> (0,0)
+  -- liftIO $ putStrLn $ show (w,h)
+  return (w,h)
+
+defaultLayout toplabel bottomlabel =
+  topBottomBorderWithLabels (str " "<+>toplabel<+>str " ") (str " "<+>bottomlabel<+>str " ") .
+  margin 1 0 Nothing
+  -- topBottomBorderWithLabel2 label .
+  -- padLeftRight 1 -- XXX should reduce inner widget's width by 2, but doesn't
+                    -- "the layout adjusts... if you use the core combinators"
+
+topBottomBorderWithLabel label = \wrapped ->
+  Widget Greedy Greedy $ do
+    c <- getContext
+    let (_w,h) = (c^.availWidthL, c^.availHeightL)
+        h' = h - 2
+        wrapped' = vLimit (h') wrapped
+        debugmsg =
+          ""
+          -- "  debug: "++show (_w,h')
+    render $
+      hBorderWithLabel (label <+> str debugmsg)
+      <=>
+      wrapped'
+      <=>
+      hBorder
+
+topBottomBorderWithLabels toplabel bottomlabel = \wrapped ->
+  Widget Greedy Greedy $ do
+    c <- getContext
+    let (_w,h) = (c^.availWidthL, c^.availHeightL)
+        h' = h - 2
+        wrapped' = vLimit (h') wrapped
+        debugmsg =
+          ""
+          -- "  debug: "++show (_w,h')
+    render $
+      hBorderWithLabel (toplabel <+> str debugmsg)
+      <=>
+      wrapped'
+      <=>
+      hBorderWithLabel bottomlabel
+
+-- XXX should be equivalent to the above, but isn't (page down goes offscreen)
+_topBottomBorderWithLabel2 label = \wrapped ->
+ let debugmsg = ""
+ in hBorderWithLabel (label <+> str debugmsg)
+    <=>
+    wrapped
+    <=>
+    hBorder
+
+-- XXX superseded by pad, in theory
+-- | Wrap a widget in a margin with the given horizontal and vertical
+-- thickness, using the current background colour or the specified
+-- colour.
+-- XXX May disrupt border style of inner widgets.
+-- XXX Should reduce the available size visible to inner widget, but doesn't seem to (cf drawRegisterScreen2).
+margin :: Int -> Int -> Maybe Color -> Widget -> Widget
+margin h v mcolour = \w ->
+  Widget Greedy Greedy $ do
+    c <- getContext
+    let w' = vLimit (c^.availHeightL - v*2) $ hLimit (c^.availWidthL - h*2) w
+        attr = maybe currentAttr (\c -> c `on` c) mcolour
+    render $
+      withBorderAttr attr $
+      withBorderStyle (borderStyleFromChar ' ') $
+      applyN v (hBorder <=>) $
+      applyN h (vBorder <+>) $
+      applyN v (<=> hBorder) $
+      applyN h (<+> vBorder) $
+      w'
+
+   -- withBorderAttr attr .
+   -- withBorderStyle (borderStyleFromChar ' ') .
+   -- applyN n border
+
+withBorderAttr attr = updateAttrMap (applyAttrMappings [(borderAttr, attr)])
+
+-- _ui = vCenter $ vBox [ hCenter box
+--                       , str " "
+--                       , hCenter $ str "Press Esc to exit."
+--                       ]
+
+borderQueryStr :: String -> Widget
+borderQueryStr ""  = str ""
+borderQueryStr qry = str " matching " <+> withAttr (borderAttr <> "query") (str qry)
+
+borderDepthStr :: Maybe Int -> Widget
+borderDepthStr Nothing  = str ""
+borderDepthStr (Just d) = str " to " <+> withAttr (borderAttr <> "depth") (str $ "depth "++show d)
+
+borderKeysStr :: [(String,String)] -> Widget
+borderKeysStr keydescs =
+  hBox $
+  intersperse sep $
+  [withAttr (borderAttr <> "keys") (str keys) <+> str ":" <+> str desc | (keys, desc) <- keydescs]
+  where
+    -- sep = str " | "
+    sep = str " "
+
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+
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diff --git a/README b/README
new file mode 100644
--- /dev/null
+++ b/README
@@ -0,0 +1,45 @@
+A curses-style text user interface for the hledger accounting tool.
+
+hledger-ui is the new name for hledger-vty. Revived in 2015, this
+package is intended to be installed as standard by all hledger users,
+except those on (native) Windows, where it is not supported.
+
+hledger-ui currently allows browsing the balance, register and print
+reports, with drill-down and scrolling.
+
+
+# HACKING
+
+## Backlog:
+```
+reg: show historical running balance
+acc: fix -H, show historical balances
+ switch to multibalance report ?
+adjust filter
+ accounts screen
+ register screen
+reg: improve other account names
+ test showing only real postings when there are reals and virtuals
+journal entry view dialog
+blog
+reg: support -V
+redraw on ctrl-l/cmd-r
+ reload on redraw
+ reload on screen change
+ reload on file change
+acc: show total
+fix --drop
+show "modified account names" with --drop or --alias
+journal screen
+bs/is/cf-ish reports
+persistent custom reports
+persistent config
+search in page
+adjust other options
+add
+edit
+custom screens
+plugin screens
+
+
+```
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/hledger-ui.cabal b/hledger-ui.cabal
new file mode 100644
--- /dev/null
+++ b/hledger-ui.cabal
@@ -0,0 +1,92 @@
+-- This file has been generated from package.yaml by hpack version 0.5.4.
+--
+-- see: https://github.com/sol/hpack
+
+name:           hledger-ui
+version:        0.27
+stability:      beta
+category:       Finance, Console
+synopsis:       Curses-style user interface for the hledger accounting tool
+description:
+    This is hledger's curses-style interface.
+    It is simpler and more convenient for browsing data than the command-line interface,
+    but lighter and faster than hledger-web.
+    hledger is a cross-platform program for tracking money, time, or
+    any other commodity, using double-entry accounting and a simple,
+    editable file format. It is inspired by and largely compatible
+    with ledger(1).  hledger provides command-line, curses and web
+    interfaces, and aims to be a reliable, practical tool for daily
+    use.
+license:        GPL
+license-file:   LICENSE
+author:         Simon Michael <simon@joyful.com>
+maintainer:     Simon Michael <simon@joyful.com>
+homepage:       http://hledger.org
+bug-reports:    http://bugs.hledger.org
+cabal-version:  >= 1.10
+build-type:     Simple
+tested-with:    GHC==7.4.2, GHC==7.6.3, GHC==7.8.4, GHC==7.10.2
+
+extra-source-files:
+    CHANGES
+    README
+
+source-repository head
+  type: git
+  location: https://github.com/simonmichael/hledger
+
+flag threaded
+  default: True
+  description:
+    Build with support for multithreaded execution
+
+flag old-locale
+  default: False
+  description:
+    A compatibility flag, set automatically by cabal.
+    If false then depend on time >= 1.5,
+    if true then depend on time < 1.5 together with old-locale.
+
+executable hledger-ui
+  main-is: hledger-ui.hs
+  hs-source-dirs:
+      .
+  ghc-options: -Wall -fno-warn-unused-do-bind -fno-warn-name-shadowing -fno-warn-missing-signatures -fno-warn-type-defaults -fno-warn-orphans
+  if flag(threaded)
+    ghc-options: -threaded
+  cpp-options: -DVERSION="0.27"
+  build-depends:
+      hledger == 0.27
+    , hledger-lib == 0.27
+    , base >= 3 && < 5
+    , base-compat >= 0.8.1
+    , brick >= 0.2 && < 0.3
+    , cmdargs >= 0.8
+    , containers
+    , data-default
+    , filepath
+    , HUnit
+    , lens >= 4.12.3 && < 4.13
+    , safe >= 0.2
+    , split >= 0.1 && < 0.3
+    , transformers
+    , vector
+    , vty >= 5.2 && < 5.5
+  if impl(ghc >= 7.4)
+    build-depends: pretty-show >= 1.6.4
+  if flag(old-locale)
+    build-depends: time < 1.5, old-locale
+  else
+    build-depends: time >= 1.5
+  other-modules:
+      Hledger.UI
+      Hledger.UI.Main
+      Hledger.UI.UIOptions
+      Hledger.UI.Theme
+      Hledger.UI.UITypes
+      Hledger.UI.UIUtils
+      Hledger.UI.AccountsScreen
+      Hledger.UI.ErrorScreen
+      Hledger.UI.RegisterScreen
+      Hledger.UI.TransactionScreen
+  default-language: Haskell2010
diff --git a/hledger-ui.hs b/hledger-ui.hs
new file mode 100644
--- /dev/null
+++ b/hledger-ui.hs
@@ -0,0 +1,2 @@
+#!/usr/bin/env runhaskell
+import Hledger.UI (main)
