beginning of xml parsing

nix-shell -p "haskellPackages.ghcWithPackages (pkgs: with pkgs; [  cabal-install ])" --run "cabal init"

CHANGELOG.md

@@ -0,0 +1,5 @@
+# Revision history for souplesse
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.

app/Main.hs

@@ -0,0 +1,4 @@
+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, Haskell!"

default.nix

@@ -0,0 +1,20 @@
+let
+  pkgs = import <nixpkgs> { };
+  haskellEnv = pkgs.haskellPackages.developPackage {
+    root = ./.;
+    modifier = drv:
+      pkgs.haskell.lib.addBuildTools drv (with pkgs.haskellPackages;
+        [
+          cabal-install
+        ]);
+  };
+in haskellEnv.overrideAttrs(o: {
+  buildInputs = o.buildInputs ++
+                (with pkgs.elmPackages; [
+                  elm
+                  elm-format
+                  elm-optimize-level-2
+                  elm-review
+                  elm-test
+                ]);
+})

elm.json

@@ -1,7 +1,7 @@
 {
     "type": "application",
     "source-directories": [
-        "src"
+        "frontend/src"
     ],
     "elm-version": "0.19.1",
     "dependencies": {
@@ -9,13 +9,17 @@
             "elm/browser": "1.0.2",
             "elm/core": "1.0.5",
             "elm/html": "1.0.0",
+            "elm/http": "2.0.0",
+            "elm/svg": "1.0.1",
             "elm/time": "1.0.0",
             "elm-explorations/test": "2.2.0",
+            "mpizenberg/elm-pointer-events": "5.0.0",
             "rtfeldman/elm-iso8601-date-strings": "1.1.4",
             "ymtszw/elm-xml-decode": "3.2.2"
         },
         "indirect": {
             "elm/bytes": "1.0.8",
+            "elm/file": "1.0.5",
             "elm/json": "1.1.3",
             "elm/parser": "1.1.0",
             "elm/random": "1.0.0",

frontend/src/Main.elm

@@ -0,0 +1,291 @@
+module Main exposing (view)
+
+import Browser
+import Html exposing (Html, button, div, span, text, img, pre)
+import Html.Attributes as H exposing (src, style, width, height)
+import Html.Events exposing (onClick)
+import Html.Events.Extra.Pointer as Pointer
+import Maybe exposing (Maybe)
+import Http
+import Svg exposing (Svg, svg, rect, circle, g)
+import Svg.Attributes as S exposing
+    ( viewBox
+    , x, y
+    , r, rx, ry
+    , cx, cy
+    , fill
+    , stroke, strokeWidth, strokeOpacity)
+
+import Track exposing (Track)
+-- import ExampleTrack
+
+
+-- MAIN
+
+
+main =
+  Browser.element { init = init
+                  , update = update
+                  , subscriptions = subscriptions
+                  , view = view }
+
+
+
+-- MATHS
+
+-- Coordinates in a Mercator projection
+type alias Coord = { x: Float, y: Float }
+
+-- zoom level
+type alias Zoom = Int
+
+type alias TileNumber = { x: Int, y: Int }
+
+type alias Lat = Float
+type alias Lng = Float
+
+-- project latling to co-ordinates based on pseudocode at
+-- https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#Zoom_levels
+
+sec x = 1 / (cos x)
+
+toCoord : Lat -> Lng -> Coord
+toCoord lat lng =
+    let
+        lat_rad = lat * pi / 180
+        x = (lng + 180) / 360
+        y = (1 - (logBase e ((tan lat_rad) + (sec lat_rad))) / pi) / 2
+    in
+        Coord x y
+
+pixelsToCoord z (x,y) =
+    let x_float = toFloat x / toFloat ( 2 ^ (z + 8))
+        y_float = toFloat y / toFloat ( 2 ^ (z + 8))
+    in Coord x_float y_float
+
+reflect : Coord -> Coord
+reflect c = Coord -c.x -c.y
+
+-- translate : a -> a -> a
+translate base offset =
+    { base | x = (base.x + offset.x), y = (base.y + offset.y) }
+
+translatePixels : Coord -> Zoom -> (Int, Int) -> Coord
+translatePixels old z (x, y) = translate old (pixelsToCoord z (x, y))
+
+
+tileCovering : Coord -> Zoom -> TileNumber
+tileCovering c z =
+    TileNumber (truncate (toFloat (2 ^ z) * c.x)) (truncate (toFloat (2 ^ z) * c.y))
+
+pixelFromCoord : Coord -> Zoom -> (Int, Int)
+pixelFromCoord c z =
+    let {x,y} = tileCovering c (z + 8)
+    in (x,y)
+
+boundingTiles : Coord -> Zoom -> Int -> Int -> (TileNumber, TileNumber)
+boundingTiles centre z width height =
+    -- find the tiles needed to cover the area (`width` x `height`)
+    -- about the point at `centre`
+    let delta = pixelsToCoord z ((width // 2), (height // 2))
+        minCoord = translate centre (reflect delta)
+        maxCoord = translate centre delta
+    in ((tileCovering minCoord z),
+        (translate (tileCovering maxCoord z) (TileNumber 1 1)))
+
+-- MODEL
+
+type Drag
+    = None
+    | Dragging  (Int, Int)  (Int, Int)
+
+dragTo : Drag ->  (Int, Int) -> Drag
+dragTo d dest =
+    case d of
+        None -> None
+        Dragging from to -> Dragging from dest
+
+dragDelta d =
+    case d of
+        None -> (0,0)
+        Dragging (fx,fy) (tx,ty) -> (fx-tx, fy-ty)
+
+type TrackState = Empty | Loading | Failure String | Present Track
+type alias Model =
+    { centre: Coord
+    , zoom: Zoom
+    , drag: Drag
+    , track: TrackState }
+
+init : () -> (Model, Cmd Msg)
+init _ = ((Model (toCoord 51.60 -0.01) 16 None Empty), fetchTrack)
+
+-- SUBSCRIPTIONS
+
+subscriptions : Model -> Sub Msg
+subscriptions model = Sub.none
+
+
+fetchTrack = Http.get
+        { url = "/track.gpx.xml"
+        , expect = Http.expectString Loaded
+        }
+
+
+-- UPDATE
+
+type Msg
+  = ZoomIn
+  | ZoomOut
+  | Scroll Int Int
+  | PointerDown (Int, Int)
+  | PointerMove (Int, Int)
+  | PointerUp (Int, Int)
+  | Loaded (Result Http.Error String)
+
+
+update : Msg -> Model -> (Model, Cmd Msg)
+
+update msg model = (newModel msg model, Cmd.none)
+
+newModel msg model =
+    case msg of
+        ZoomIn ->
+            { model | zoom = model.zoom + 1 }
+
+        ZoomOut ->
+            { model | zoom = model.zoom - 1 }
+
+        Scroll x y ->
+            { model | centre = translatePixels model.centre model.zoom (x,y) }
+
+        PointerDown (x,y) ->
+            { model | drag = Dragging (x,y) (x,y) }
+
+        PointerMove (x,y) ->
+            { model | drag = dragTo model.drag (x,y) }
+
+        PointerUp (x,y) ->
+            { model | drag = None,
+                  centre = translatePixels model.centre model.zoom (dragDelta model.drag) }
+
+        Loaded result ->
+            case result of
+                Ok trk -> { model
+                              | track = case Track.parse trk of
+                                            Ok track -> Present track
+                                            Err _ -> Failure "parse failed"
+                          }
+                Err e -> { model | track = Failure "e" }
+
+-- VIEW
+
+tileUrl : TileNumber -> Zoom -> String
+tileUrl {x,y} z =
+    String.concat ["https://a.tile.openstreetmap.org",
+                       "/", String.fromInt z,
+                       "/", String.fromInt x,
+                       "/", String.fromInt y,
+                       ".png" ]
+
+tileImg zoom tilenumber = img [ width 256,
+                                height 256,
+                                src (tileUrl tilenumber zoom) ] []
+
+trackView : Track -> Svg Msg
+
+
+trackView track =
+    svg
+    [H.style "width" "100%"
+    ,H.style "height" "100%"
+    ,H.style "position" "absolute"
+    ]
+    [ g
+      [fill "none"
+      ,stroke "blue"
+      ,strokeWidth "7"
+      ,strokeOpacity "0.5"]
+      [ rect
+        [ x "10"
+        , y "10"
+        , S.width "100"
+        , S.height "100"
+        , rx "15"
+        , ry "15"
+        ]
+        []
+      , circle
+        [ cx "50"
+        , cy "50"
+        , r "50"
+        ]
+        []
+    ]]
+
+px x = String.fromInt x ++ "px"
+
+tiles xs ys zoom =
+    List.map
+        (\ y -> div []
+             (List.map (\ x -> tileImg zoom (TileNumber x y)) xs))
+        ys
+
+
+canvas centre zoom width height track =
+    let (mintile, maxtile) = boundingTiles centre zoom width height
+        -- offset is pixel difference between centre (which *should*
+        -- be the middle of the image) and actual middle of the canvas
+        (pixelCentreX,pixelCentreY) = pixelFromCoord centre zoom
+        leftedge = mintile.x * 256
+        topedge = mintile.y * 256
+        offsetX = pixelCentreX - (width // 2) - leftedge
+        offsetY = pixelCentreY - (height // 2) - topedge
+        pixWidth = (1 + maxtile.x - mintile.x) * 256
+        pixHeight = (1 + maxtile.y - mintile.y) * 256
+        xs = List.range mintile.x maxtile.x
+        ys = List.range mintile.y maxtile.y
+        epos e = Tuple.mapBoth floor floor e.pointer.clientPos
+        tv = case track of
+                 Present t -> trackView t
+                 Failure f -> div [] [ text "failure", text f]
+                 Loading -> div [] [text "loading"]
+                 Empty -> div [] [text "no points"]
+    in  div [style "position" "absolute"
+            ,style "width" (px pixWidth)
+            ,style "height" (px pixHeight)
+            ,style "left" (px -offsetX)
+            ,style "top" (px -offsetY)
+            ,style "lineHeight" (px 0)
+            ,Pointer.onUp (\e -> PointerUp (epos e))
+            ,Pointer.onMove (\e -> PointerMove (epos e))
+            ,Pointer.onDown (\e -> PointerDown (epos e)) ]
+        (tv :: tiles xs ys zoom)
+
+portalWidth = 600
+portalHeight = 600
+
+view : Model -> Html Msg
+view model =
+    let coord = translate model.centre (pixelsToCoord model.zoom (dragDelta model.drag))
+        canvasV = canvas coord model.zoom portalWidth portalHeight model.track
+    in div []
+        [ (div [ style "width" (px portalWidth)
+               , style "height" (px portalHeight)
+               , style "display" "inline-block"
+               , style "position" "relative"
+               , style "overflow" "hidden"]
+               [canvasV])
+        , div [] [ text (String.fromInt model.zoom ) ]
+        , div [] [ case model.track of
+                       Present tk -> text (String.fromInt (List.length tk))
+                       _ -> text "dgdfg"
+                 ]
+        , button [ onClick ZoomOut ] [ text "-" ]
+        , button [ onClick ZoomIn ] [ text "+" ]
+        , button [ onClick (Scroll 0 -10) ] [ text "^" ]
+        , button [ onClick (Scroll 0 10) ] [ text "V" ]
+        , button [ onClick (Scroll -10 0) ] [ text "<" ]
+        , button [ onClick (Scroll 10 0) ] [ text ">" ]
+--        , div [] [ text (Debug.toString (List.length model.track)) ]
+        ]

frontend/src/Track.elm

@@ -12,6 +12,7 @@ type alias Point =
     , time : Maybe Time.Posix
     , power : Maybe Int
     , cadence : Maybe Int
+    , hr : Maybe Int
     }
 
 type alias Track =  List Point
@@ -26,12 +27,13 @@ timeDecoder = XD.andThen (\ts ->
 
 triple x y z = (x,y,z)
 
-pointDecoder = XD.map4 Point
+pointDecoder = XD.map5 Point
                (XD.map3 triple (floatAttr "lat") (floatAttr "lon")
                         (XD.maybe (path ["ele"] (single XD.float))))
                (XD.maybe (path ["time"] (single timeDecoder)))
                (XD.maybe (path ["extensions", "gpxtpx:TrackPointExtension", "pwr:PowerInWatts"] (single XD.int)))
                (XD.maybe (path ["extensions", "gpxtpx:TrackPointExtension", "gpxtpx:cad"] (single XD.int)))
+               (XD.maybe (path ["extensions", "gpxtpx:TrackPointExtension", "gpxtpx:hr"] (single XD.int)))
 
 
 gpxDecoder =

frontend/tests/Fixtures.elm

@@ -70,17 +70,20 @@ threepoints_expected  =
            (Just (Time.millisToPosix 1729669252256))
            (Just 89)
            (Just 110)
+           Nothing
       )
     , (Point
            (51.600679, -0.018179, Just 65.5)
            (Just (Time.millisToPosix 1729669255259))
            (Just 86)
            (Just 111)
+           Nothing
       )
     , (Point
            (51.600697, -0.018064, Just 66.2)
            (Just (Time.millisToPosix 1729669256231))
            (Just 86)
            (Just 111)
+           Nothing
       )
     ]

frontend/tests/TrackTest.elm

@@ -28,6 +28,19 @@ specs =
                               (_, _, ele) -> Expect.equal ele Nothing
                       Ok _ -> Expect.fail "empty list"
                       (Err f) -> Expect.fail f
+        , test "heart rate" <|
+              \_ ->
+              let
+                  xml = String.replace
+                        "</gpxtpx:TrackPointExtension>"
+                        "<gpxtpx:hr>97</gpxtpx:hr></gpxtpx:TrackPointExtension>"
+                        Fixtures.threepoints
+              in
+                  case Track.parse xml of
+                      Ok (p::pts) ->
+                          Expect.equal p.hr (Just 97)
+                      Ok _ -> Expect.fail "no points"
+                      (Err f) -> Expect.fail f
 
         , test "multiple trksegs are coalesced" <|
               \_ ->

lib/Track.hs

@@ -0,0 +1,89 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module Track where
+import Data.Time
+import qualified Data.List
+-- import qualified Text.XML as X
+import Text.XML
+import Text.XML.Cursor as Cursor
+import qualified Data.Text
+-- import qualified Data.Text.Lazy
+import Data.Text.Lazy as T
+import Debug.Trace (trace, traceShow)
+import Data.List as List
+import Data.Map as Map
+import Control.Exception
+
+data Pos = Pos Float Float Float deriving (Show)
+
+
+type Power = Maybe Int
+type Cadence = Maybe Int
+type HeartRate = Maybe Int
+
+data Point = Point {
+  pos :: Pos,
+  time :: UTCTime,
+  power :: Power,
+  cadence :: Cadence,
+  heartRate :: HeartRate
+} deriving (Show)
+
+type Track = [Point]
+
+mkPoint pos =
+  Point
+    pos
+    (UTCTime (toEnum  60631) 43200)
+    (Just 0)
+    (Just 0)
+    (Just 0)
+
+parse :: String -> Either SomeException [Point]
+parse' str = [
+  Point
+    (Pos 51.6 0 0)
+    (UTCTime (toEnum  60631) 43200)
+    (Just 0)
+    (Just 0)
+    (Just 0)
+  ]
+
+elToPoint :: Cursor -> Point
+elToPoint n =
+  trace "el" $
+  case traceShow (node n) (node n) of
+    NodeElement (Element _ attrs _) ->
+      let
+        lat = traceShow (getAttr "lat") (getAttr "lat")
+        lon = getAttr "lon"
+      in mkPoint (Pos lat lon 0)
+      where getAttr name =
+              case (Map.lookup name attrs) of
+                Just v -> (read (Data.Text.unpack v) :: Float)
+                _ -> 0
+    _ -> mkPoint (Pos 1 2 3)
+
+getPoints :: Cursor -> [Point]
+getPoints c =
+  let
+    trkpts =
+      child c >>=
+      -- element "gpx" >>= child >>=
+      element "trk" >>= descendant >>=
+      element "trkpt"
+  in
+    List.map elToPoint trkpts
+
+
+parse str =
+  case parseText def (T.pack str) of
+    Right gpx ->
+      let
+        points = getPoints $ fromDocument gpx
+      in traceShow "(gpx)" (Right points)
+    Left err ->
+      Left err
+
+length :: Track -> Int
+length trk = Data.List.length trk

shell.nix

@@ -1,13 +0,0 @@
-with import <nixpkgs> {} ; 
-pkgs.mkShell {
-  packages = [
-    pkgs.caddy
-    pkgs.elmPackages.elm
-    pkgs.elmPackages.elm-format
-    pkgs.elmPackages.elm-optimize-level-2
-    pkgs.elmPackages.elm-review
-    pkgs.elmPackages.elm-test
-#    pkgs.nodejs_18
-#    pkgs.shellcheck
-  ];
-}

souplesse.cabal

@@ -0,0 +1,105 @@
+cabal-version:      3.0
+-- The cabal-version field refers to the version of the .cabal specification,
+-- and can be different from the cabal-install (the tool) version and the
+-- Cabal (the library) version you are using. As such, the Cabal (the library)
+-- version used must be equal or greater than the version stated in this field.
+-- Starting from the specification version 2.2, the cabal-version field must be
+-- the first thing in the cabal file.
+
+-- Initial package description 'souplesse' generated by
+-- 'cabal init'. For further documentation, see:
+--   http://haskell.org/cabal/users-guide/
+--
+-- The name of the package.
+name:               souplesse
+
+-- The package version.
+-- See the Haskell package versioning policy (PVP) for standards
+-- guiding when and how versions should be incremented.
+-- https://pvp.haskell.org
+-- PVP summary:     +-+------- breaking API changes
+--                  | | +----- non-breaking API additions
+--                  | | | +--- code changes with no API change
+version:            0.1.0.0
+
+-- A short (one-line) description of the package.
+-- synopsis:
+
+-- A longer description of the package.
+-- description:
+
+-- The license under which the package is released.
+license:            AGPL-3.0-only
+
+-- The file containing the license text.
+license-file:       LICENSE
+
+-- The package author(s).
+author:             Daniel Barlow
+
+-- An email address to which users can send suggestions, bug reports, and patches.
+maintainer:         <dan@telent.net>
+
+-- A copyright notice.
+-- copyright:
+category:           Web
+build-type:         Simple
+
+-- Extra doc files to be distributed with the package, such as a CHANGELOG or a README.
+extra-doc-files:    CHANGELOG.md
+
+-- Extra source files to be distributed with the package, such as examples, or a tutorial module.
+-- extra-source-files:
+
+common warnings
+    ghc-options: -Wall
+
+executable souplesse
+    -- Import common warning flags.
+    import:           warnings
+
+    -- .hs or .lhs file containing the Main module.
+    main-is:          Main.hs
+
+    -- Modules included in this executable, other than Main.
+    -- other-modules:
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+
+    -- Other library packages from which modules are imported.
+    build-depends:    base ^>=4.18.2.1
+
+    -- Directories containing source files.
+    hs-source-dirs:   app
+
+    -- Base language which the package is written in.
+    default-language: GHC2021
+
+-- mostly copied from
+-- https://functional.works-hub.com/learn/basic-unit-testing-in-haskell-using-hunit-and-cabal-29e47
+
+library souplesse-lib
+    exposed-modules:
+        Track
+    hs-source-dirs:
+        lib
+    build-depends:
+        base >=4.7 && <5
+      , xml-conduit
+      , time
+      , containers
+      , text
+      -- , text-iso8601
+    default-language: GHC2021
+
+test-suite tests
+    type: exitcode-stdio-1.0
+    main-is: UnitTest.hs
+    hs-source-dirs:
+        tests
+    build-depends:
+        base >=4.7 && <5
+      , souplesse-lib
+      , HUnit
+    default-language: GHC2021

src/Main.elm

@@ -1,56 +0,0 @@
-module Main exposing (..)
-
-import Browser
-import Html exposing (Html, button, div, text)
-import Html.Events exposing (onClick)
-import Track exposing (Track)
-
--- MAIN
-
-
-main =
-  Browser.sandbox { init = init, update = update, view = view }
-
-
-
--- MODEL
-
-
-type alias Model = Track
-
-
-init : Model
-init =
-  Track.read "hello"
-
-
-
--- UPDATE
-
-
-type Msg
-  = Increment
-  | Decrement
-
-
-update : Msg -> Model -> Model
-update msg model =
-  case msg of
-    Increment ->
-      model
-
-    Decrement ->
-      model
-
-
-
--- VIEW
-
-
-view : Model -> Html Msg
-view model =
-  div []
-    [ button [ onClick Decrement ] [ text "-" ]
-    , div [] [ text (String.fromInt (List.length model)) ]
-    , button [ onClick Increment ] [ text "+" ]
-    ]

tests/UnitTest.hs

@@ -0,0 +1,40 @@
+module Main where
+
+import qualified Track (Track, parse, length )
+import Test.HUnit
+import qualified System.Exit as Exit
+import Control.Exception
+import Debug.Trace (trace, traceShow)
+
+
+-- test1 :: Test
+-- test1 = TestCase $
+--         let
+--           trk = Track.parse "<gpx></gpx>"
+--         in
+--           assertEqual "empty track has no elements"
+--           0 (Track.length trk)
+
+test3 = TestCase $  assertEqual "empty track has no elements" 1 2
+
+test2 = TestCase $
+        case Track.parse
+            "<gpx> <trk> <trkseg> \n\
+            \<trkpt lat=\"51\" lon=\"-0.1\"> </trkpt> \n\
+            \</trkseg> </trk> </gpx>"
+        of
+          Left err -> assertFailure (displayException err)
+          Right trk ->
+            traceShow trk $
+              assertEqual "one el" 1 (Track.length trk)
+
+tests :: Test
+tests = TestList [
+--  TestLabel "test1" test1,
+  TestLabel "test2" test2
+  ]
+
+main :: IO ()
+main = do
+    result <- runTestTT tests
+    if failures result > 0 then Exit.exitFailure else Exit.exitSuccess