gleam-lang/rebar_gleam

🧰 Build Gleam code with rebar3

rebar_gleam's Issues

Module defined multiple times error

Hi!

When running rebar3 compile and then rebar3 eunit immediately after, this error appears:

$ rm -rf rebar.lock _build/ gen/* && rebar3 compile && rebar3 eunit
===> Fetching rebar_gleam v0.1.0
===> Analyzing applications...
===> Compiling rebar_gleam
===> Verifying dependencies...
===> Fetching gleam_stdlib v0.16.0
Compiling resistor_color
Compiling gleam/string_builder
Compiling gleam/should
Compiling resistor_color_test
Compiling gleam/pair
Compiling gleam/atom
Compiling gleam/bit_string
Compiling gleam/bit_builder
Compiling gleam/io
Compiling gleam/order
Compiling gleam/int
Compiling gleam/list
Compiling gleam/option
Compiling gleam/regex
Compiling gleam/result
Compiling gleam/map
Compiling gleam/queue
Compiling gleam/set
Compiling gleam/float
Compiling gleam/bool
Compiling gleam/dynamic
Compiling gleam/function
Compiling gleam/iterator
Compiling gleam/string
Compiling gleam/base
Compiling gleam/os
Compiling gleam/uri

warning: Unused variable
   ┌─ /home/michal/projects/exercism-gleam/exercises/practice/resistor-color/src/resistor_color.gleam:14:13
   │
14 │ pub fn code(color: Color) -> Int {
   │             ^^^^^^^^^^^^ This variable is never used.

Hint: you can ignore it with an underscore: `_color`.
Done!
===> Analyzing applications...
===> Compiling gleam_stdlib
===> Analyzing applications...
===> Compiling resistor_color
gen/src/resistor_color.erl:19:6: Warning: variable 'Color' is unused

===> Verifying dependencies...

error: Duplicate module

The module `resistor_color` is defined multiple times.

First:  /home/michal/projects/exercism-gleam/exercises/practice/resistor-color/src/resistor_color.gleam
Second: /home/michal/projects/exercism-gleam/exercises/practice/resistor-color/src/resistor_color.gleam

===> Unable to compile Gleam project

Project: https://github.com/exercism/gleam/tree/main/exercises/practice/resistor-color

Gleam 0.16.0, rebar 3.16.1, erlang 24.0.2

Run test project on GitHub actions

Plugin not available

Just installed everything. I can get gleam to compile but I see this when I run rebar3.

===> Plugin {rebar_gleam,{git,"https://github.com/gleam-lang/rebar_gleam"}} not available. It will not be used.

New compiler API

I'm looking to write a new rebar3 plugin for the new compiler API

The API

The API is to be called once per Erlang application within the project, starting with the left applications that have no deps, up to the root, so that dependancy modules are compiled before dependant modules.

It looks something like this:

gleam compile-package \
  --name app_name \
  --src directory/containing/gleam/files \
  --out directory/to/write/to \
  --lib path/to/out/dir/of/dep \
  --lib path/to/out/dir/of/another/dep # ...etc

It reads metadata files from the --lib directories for type information from already compiled Gleam applications, then it reads all the Gleam files from --src, then it writes compiled Erlang files and metadata files to the --out directory.

rebar3 integration

I have been looking at the rebar_compiler behaviour, but it seems to be focused on compiling individual files, but the Gleam compiler operates at the application level.
https://github.com/erlang/rebar3/blob/dd9b8b1f41520c307f08b6005eb77ce70d54ee42/src/rebar_compiler.erl#L34

I found a project_builder concept here. It is just a build/1 function that returns ok or an error tuple.

https://github.com/erlang/rebar3/blob/dd9b8b1f41520c307f08b6005eb77ce70d54ee42/src/rebar_state.erl#L446

Questions

How does the project_type field get set? https://github.com/erlang/rebar3/blob/73aa64fb342ef76bf6fc4d1734c6df711bebe5ab/src/rebar_prv_compile.erl#L326-L339

How do we invoke the normal rebar3 build process after the Gleam project builder has run?

@tsloughter If have a spare moment I would be very grateful if you could share whether you think I'm going in the right direction. Thank you! 🙏