Auto-configure when projects use Elm 0.19 vs 0.18

[purcell]

As detailed in #138 (comment), it's now largely possible to configure elm-mode for Elm 0.19 projects, but it would probably be better if this were auto-detected. In fact, the presence of elm.json vs elm-package.json should be enough of a clue in most cases.

(Noting this here for future implementation by myself or another contributor.)

[saurabhnanda]

I've spent the last 2-3 hours trying to get elm-mode working with my 0.19 project properly, but haven't been successful. Here's what I tried:

• Upgraded spacemacs packages to get the latest version of elm-mode and flycheck-elm
• Tried customising the following variables in ~/.spacemacs file, as well as .dir-locals.el as mentioned at repl does not load after upgrading to elm 0.19 #138 (comment)
  • elm-compile-command
  • elm-interactive-command
  • elm-package-command
  • elm-reactor-command
• Tried setting the command/s to absolute paths, eg. <home-dir>/.nvm/versions/node/v10.4.0/bin/elm
• Tried setting my default NVM to 10.4.0 (it was 6.11.1 earlier). Confirmed that a new bash / terminal is using nvm 10.4.0

        v6.11.1
         v8.2.1
->      v10.4.0
         system
default -> v10.4.0
node -> stable (-> v10.4.0) (default)
stable -> 10.4 (-> v10.4.0) (default)
iojs -> N/A (default)
lts/* -> lts/carbon (-> N/A)
lts/argon -> v4.9.1 (-> N/A)
lts/boron -> v6.14.2 (-> N/A)
lts/carbon -> v8.11.2 (-> N/A)

• Tried uninstalling 0.18 via npm uninstall elm@0.18
• Tried physically removing the elm-make, elm-package, elm-repl and elm-reactor from ~/.nvm/versions/node/v10.4.0/bin

Nothing worked. My brain is fried.

Any help would be appreciated.

[purcell]

Please can you be more specific than "nothing worked"? What steps did you follow, what did you expect, and what happened instead?

[danieljaouen]

Should we expect company-elm to not work until this is resolved?

[purcell]

Should we expect company-elm to not work until this is resolved?

Yes, correct. See #142 for the completion-specific side of things. It's not pretty.

[danieljaouen]

I don't know if you get this often or not, but I just wanted to thank you for your hard work and dedication for working on this project. The whole elm-oracle debacle looks like a mess and I am super glad that there is someone on the other side of things willing to tackle problems like these. :-)

[purcell]

Thanks, I appreciate it, but I should also caution that I haven't concretely tackled it yet. :-) It was frustrating to get elm-oracle completion working so nicely with 0.18 only to have it break.

[danieljaouen]

Nevertheless, it is a noble effort. I don't have much in the way of finances to remunerate you for your hard work, but I figured a word of encouragement wouldn't hurt. :-)

[purcell]

The 0.19 config is now the default. I no longer plan to pursue auto-configuration for older Elm versions.