feat: support hledger-ui on windows

Introduced or bumped dependencies:

- brick-2.1.1
- vty-6.1
- vty-crossplatform-0.4.0.0
- vty-windows-0.2.0.1 conditionally on windows (current version of
  vty-crossplatform has 0.2.0.0 as a lower bound, need to put a newer version explcitly;
  once we get a newer vty-crossplatform, we will be able to drop this conditional)
- vty-unix (indirectly via vty-crossplatform)

hledger-ui/Hledger/UI/Main.hs

@@ -20,7 +20,8 @@ import Data.List (find)
 import Data.List.Extra (nubSort)
 import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
-import Graphics.Vty (mkVty, Mode (Mouse), Vty (outputIface), Output (setMode))
+import Graphics.Vty (Mode (Mouse), Vty (outputIface), Output (setMode))
+import Graphics.Vty.CrossPlatform (mkVty)
 import Lens.Micro ((^.))
 import System.Directory (canonicalizePath)
 import System.Environment (withProgName)

hledger-ui/hledger-ui.cabal

@@ -73,7 +73,7 @@ library
       ansi-terminal >=0.9
     , async
     , base >=4.14 && <4.19
-    , brick >=1.5 && <2
+    , brick >=2.1.1 && <3
     , cmdargs >=0.8
     , containers >=0.5.9
     , data-default
@@ -95,14 +95,13 @@ library
     , text-zipper >=0.4
     , time >=1.5
     , transformers
-    , unix
     , vector
-    , vty >=5.15 && <6
+    , vty >=6.1 && <7
+    , vty-crossplatform >=0.4.0.0 && <0.5.0.0
   default-language: Haskell2010
   if os(windows)
-    buildable: False
-  else
-    buildable: True
+    build-depends:
+        vty-windows >=0.2.0.1 && <0.3
 
 executable hledger-ui
   main-is: hledger-ui.hs
@@ -116,9 +115,5 @@ executable hledger-ui
       base >=4.14 && <4.19
     , hledger-ui
   default-language: Haskell2010
-  if os(windows)
-    buildable: False
-  else
-    buildable: True
   if flag(threaded)
     ghc-options: -threaded

hledger-ui/package.yaml

@@ -51,7 +51,6 @@ ghc-options:
 dependencies:
 - base >=4.14 && <4.19
 
-when:
  # curses is required to build terminfo for vty for hledger-ui.
  # On POSIX systems it might be not present.
  # On windows it's very likely not present, but possibly it could be.
@@ -61,12 +60,10 @@ when:
  #  curses
  #    default: True
  #    description:
- # For now, just don't build hledger-ui on windows
- - condition: os(windows)
-   then:
-     buildable: false
-   else:
-     buildable: true
+ # 
+ # note on windows: the vty-windows (and hence hledger-ui) will reliably work only on the newer backends
+ # like Windows Terminal.
+ # mintty-based backends (default for cygwin/gitbash/msys2) are not supported (yet)
 
 library:
   source-dirs: .
@@ -101,10 +98,13 @@ library:
   - time >=1.5
   - transformers
   - vector
-  # not installable on windows, cf buildable flag below
-  - brick >=1.5 && <2
-  - vty >=5.15 && <6
-  - unix
+  - brick >=2.1.1 && <3
+  - vty >=6.1 && <7
+  - vty-crossplatform >= 0.4.0.0 && < 0.5.0.0
+  when:
+    - condition: os(windows)
+      dependencies: vty-windows >= 0.2.0.1 && < 0.3
+
 
 executables:
   hledger-ui:

stack.yaml

@@ -31,3 +31,8 @@ nix:
 # #  "$targets": -Werror
 # #  "$everything": -O2
 # #  some-package: -DSOME_CPP_FLAG
+extra-deps:
+  - vty-windows-0.2.0.1
+  - vty-crossplatform-0.4.0.0
+  - brick-2.1.1
+  - vty-6.1