Simple reflex-platform app with JavaScript interop.

CHANGELOG.md

Revision history for small-viz

0.1.0.0 -- YYYY-mm-dd

• First version. Released on an unsuspecting world.

default.nix

let
  # ./updater versions.json reflex-platform
  fetcher = { owner, repo, rev, sha256, ... }: builtins.fetchTarball {
    inherit sha256;
    url = "https://github.com/${owner}/${repo}/tarball/${rev}";
  };
  reflex-platform = fetcher (builtins.fromJSON (builtins.readFile ./versions.json)).reflex-platform;
in (import reflex-platform { system = builtins.currentSystem; }).project ({ pkgs, ... }: {
  useWarp = true;
  withHoogle = false;
  packages = {
    small-viz = ./.;
  };
  shells = {
    ghc = ["small-viz"];
    ghcjs = ["small-viz"];
  };
})

LICENSE

Copyright (c) 2019, Vaibhav Sagar

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.

    * Neither the name of Vaibhav Sagar nor the names of other
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Main.hs

{-# LANGUAGE OverloadedStrings #-}
import Reflex.Dom
import Language.Javascript.JSaddle (liftJSM, toJSVal)
import Viz (viz)

main = mainWidgetWithHead widgetHead $ el "div" $ do
  t <- textArea def
  e <- _element_raw . fst <$> el' "div" blank
  performEvent_ $ ffor (updated (_textArea_value t)) $ \text -> liftJSM $ do
    jsE <- toJSVal e
    jsT <- toJSVal text
    viz jsE jsT
  where
    widgetHead :: DomBuilder t m => m ()
    widgetHead = do
      script "https://cdn.jsdelivr.net/npm/viz.js@2.1.2/viz.min.js"
      script "https://cdn.jsdelivr.net/npm/viz.js@2.1.2/full.render.min.js"
    script src = elAttr "script" ("type" =: "text/javascript" <> "src" =: src) blank

Setup.hs

import Distribution.Simple
main = defaultMain

small-viz.cabal

cabal-version:       >=1.10
-- Initial package description 'small-viz.cabal' generated by 'cabal init'.
--   For further documentation, see http://haskell.org/cabal/users-guide/

name:                small-viz
version:             0.1.0.0
-- synopsis:
-- description:
-- bug-reports:
license:             BSD3
license-file:        LICENSE
author:              Vaibhav Sagar
maintainer:          vaibhavsagar@gmail.com
-- copyright:
-- category:
build-type:          Simple
extra-source-files:  CHANGELOG.md

executable small-viz
  main-is:             Main.hs
  other-modules:       Viz
  -- other-extensions:
  build-depends:       base >=4.12 && <4.13
                     , jsaddle
                     , reflex
                     , reflex-dom
  -- hs-source-dirs:
  default-language:    Haskell2010

updater

#! /usr/bin/env nix-shell
#! nix-shell -i bash
#! nix-shell -p curl jq nix

set -eufo pipefail

FILE=$1
PROJECT=$2

OWNER=$(jq -r '.[$project].owner' --arg project "$PROJECT" < "$FILE")
REPO=$(jq -r '.[$project].repo' --arg project "$PROJECT" < "$FILE")
DEFAULT_BRANCH=$(jq -r '.[$project].branch // "master"' --arg project "$PROJECT" < "$FILE")

BRANCH=${3:-$DEFAULT_BRANCH}

REV=$(curl "https://api.github.com/repos/$OWNER/$REPO/branches/$BRANCH" | jq -r '.commit.sha')
SHA256=$(nix-prefetch-url --unpack "https://github.com/$OWNER/$REPO/tarball/$REV")
TJQ=$(jq '.[$project] = {owner: $owner, repo: $repo, branch: $branch, rev: $rev, sha256: $sha256}' \
  --arg project "$PROJECT" \
  --arg owner "$OWNER" \
  --arg repo "$REPO" \
  --arg branch "$BRANCH" \
  --arg rev "$REV" \
  --arg sha256 "$SHA256" \
  < "$FILE")
[[ $? == 0 ]] && echo "${TJQ}" >| "$FILE"

versions.json

{
  "reflex-platform": {
    "owner": "reflex-frp",
    "repo": "reflex-platform",
    "branch": "develop",
    "rev": "8f4b8973a06f78c7aaf1a222f8f8443cd934569f",
    "sha256": "167smg7dyvg5yf1wn9bx6yxvazlk0qk64rzgm2kfzn9mx873s0vp"
  }
}

Viz.hs

module Viz where

import Language.Javascript.JSaddle

viz :: JSVal -> JSVal -> JSM ()
viz element string = do
  call vizJs vizJs [element, string]
  pure ()

vizJs :: JSM JSVal
vizJs = eval
  "(function(e, string) { \
  \  var viz = new Viz(); \
  \  viz.renderSVGElement(string) \
  \  .then(function(element) { \
  \    e.innerHTML = element.outerHTML; \
  \  }) \
  \  .catch(function(error) { \
  \    e.innerHTML = error; \
  \  }) \
  \})"