Lisplog

How do I run elm-test in Elm 0.19?

Submitted by Bill St. Clair on Mon, 17 Sep 2018 00:24:33 GMT

This is a FAQ, so I'm making a blog post to answer it.

elm-test is still in beta for Elm 0.19. To install it:

$ npm install -g elm-test@beta

The tests directory no longer needs an elm-package.json file (nor does it need elm.json).

Your top-level elm.json file needs to include the following:

    "test-dependencies": {
        "elm-explorations/test": "1.0.0 <= v < 2.0.0"
    }

The easiest way to get it there is with elm-test itself. The following will create a tests directory, containing an example test file, Example.elm, and will add test-dependencies to elm.json.

$ elm-test init

That's it. There is not yet support for running elm-test in the browser, nor is there support for testing DOM output.

billstclair/elm-localstorage is configured with a tests directory to test its JSON encoders and decoders: github.com/billstclair/elm-localstorage. To run the tests:

$ git clone git@github.com:billstclair/elm-localstorage.git
$ cd elm-localstorage
$ elm-test

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iPhone Xs Pricing

Submitted by Bill St. Clair on Wed, 12 Sep 2018 19:22:55 GMT

From the www.apple.com/iphone pages.

Watch the 12 September keynote.

Prices (in parentheses) are per month for Apple financing.

Model	64 gig	128 gig	256 gig	512 gig	Order	Ship
iPhone Xs:	$999 ($49.91)		$1149 ($56.16)	$1349 ($64.50)	9/14	9/21
Xs Max:	$1099 ($54.08)		$1249 ($60.33)	$1449 ($68.66)
Xr:	$749 ($37.41)	$799 ($39.50)	$899 ($43.66)		10/19	10/26
iOS 12:	Free					9/17
macOS Mojave	Free					9/24

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Building the Elm compiler

Submitted by Bill St. Clair on Fri, 07 Sep 2018 07:01:51 GMT

I learned how to build the Elm version 0.19 compiler, in an effort to get it to provide full backtraces of a bug I was tickling. I failed at getting the full backtraces, but I succeeded in adding some debugging output. Anyway, here's how to do it.

First, you need to install Haskell on your machine. You need version 8.2.2 for the Elm 0.19 compiler. www.haskell.org/platform/prior.html

Then do the following:

$ git clone git@github.com:elm/compiler.git
$ cd compiler
$ cabal sandbox init
$ cabal install

The Elm executable will be in .cabal-sandbox/bin/elm.

The first build takes a while, as it needs to download and build all the dependenies. After that, it gets faster. cabal sandbox delete lets you start over.

After making changes to the source, run cabal install again, and it will compile only the changed files and files that depend on them.

---

To build the entire Haskell stack, with stack backtraces enabled, from @mfeineis on the Elm Slack channel (I haven't tried this):

Init with stack:

$ stack init --resolver lts-11.20

Add options in elm.cabal:

Executable elm
    if flag(dev)
        ghc-options: -O0 -Wall -Werror -rtsopts -eventlog

Build with stack:

$ stack build --flag elm:dev --profile

Run with RTS options:

$ elm make ./src/Main.elm \
   --output=./dist/app.js +RTS -xc -lu -RTC \
   2>eventlog_readable.log

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Server Updated to Ubuntu 16.04LTS

Submitted by Bill St. Clair on Fri, 27 Apr 2018 12:51:49 GMT

With the release of Ubuntu 18.04LTS, I have upgraded the server for this web site to Ubuntu 16.04LTS. I feel no need to follow the bleeding edge for a stable operating system, but 14.04 will only be supported for another year, so it was time to go to 16.04.

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JSMaze Returns, in Elm!

Submitted by Bill St. Clair on Thu, 29 Mar 2018 03:52:05 GMT

I mentioned JSMaze.com in my last post. Here are some more details.

I wrote a little maze game in 2012, as my first introduction to Node.js, and put it up on an Amazon AWS machine at JSMaze.com. I took it down a few months back, to save the $18/month it was costing me. I decided to remake it, in Elm, and it's back up, running on one of my Digital Ocean VMs, for no additional cost, again at JSMaze.com. Link there to GitHub repository.

So far I have the basic 2D and perspective rendering working, with movement via keyboard or buttons. It works in a touch-screen browser, though the keyboard is a much nicer control interface.

Next I'll work on a maze editor and persistent storage for mazes. Then a server, with war mode and the nice spinning bullet animation I did before. Then I'll add chat and sound, and I'll be back where I was before, but with code that's much easier to understand and expand.

My plan then is to do what I had in mind for the original, but that was too painful in plain JavaScript, the ability to have lots of mazes running at once, invitations to private mazes, drawings and uploaded images on the walls.

I'm having a blast!

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