nandi.uk
Fork of daniellemaywood.uk/gleam — Wasm codegen work
Add erlang.application_start_argument configuration
author
Louis Pilfold
date
(Sep 21, 2025, 9:51 PM +0100)
commit
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871f6d8cd488e3629bd6cc81e8e2669eba01bbf2
parent
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efe51ee8dec952191f4882504c46b5c78f99a6db
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CHANGELOG.md
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CHANGELOG.md
···
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([sobolevn](https://github.com/sobolevn))
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- The `erlang.application_start_argument` parameter has been added to
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`gleam.toml`. This is a string containing an Erlang term that will be written
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into the package's Erlang `.app` file if `erlang.application_start_module`
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has been set, replacing the default argument of `[]`.
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([Louis Pilfold](https://github.com/lpil))
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- Generated code for the JavaScript target now includes a public API which can
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be used for FFI interacting with Gleam custom types. For example, if you have
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this Gleam code:
+1
compiler-cli/src/dependencies/tests.rs
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compiler-cli/src/dependencies/tests.rs
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-6
compiler-core/src/codegen.rs
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-6
compiler-core/src/codegen.rs
···
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let path = self.output_directory.join(format!("{}.app", &config.name));
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let start_module = config
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.erlang
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.application_start_module
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.as_ref()
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.map(|module| tuple("mod", &format!("{{'{}', []}}", module_erlang_name(module))))
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.unwrap_or_default();
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let start_module = match config.erlang.application_start_module.as_ref() {
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None => "".into(),
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Some(module) => {
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let module = module_erlang_name(module);
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let argument = match config.erlang.application_start_argument.as_ref() {
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Some(argument) => argument.as_str(),
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None => "[]",
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};
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tuple("mod", &format!("{{'{module}', {argument}}}"))
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}
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};
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let modules = modules
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.iter()
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compiler-core/src/config.rs
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compiler-core/src/config.rs
···
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#[derive(Deserialize, Serialize, Debug, PartialEq, Eq, Default, Clone)]
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pub struct ErlangConfig {
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/// An module that can be set in the `.app` file as the entrypoint for a stateful application
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/// that defines a singleton supervision tree.
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/// Erlang syntax.
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#[serde(default)]
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pub application_start_module: Option<EcoString>,
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/// The argument for the start module start function. If not set then `[]` is used as the
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/// default argument.
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/// Erlang syntax.
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#[serde(default)]
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pub application_start_argument: Option<EcoString>,
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#[serde(default)]
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pub extra_applications: Vec<EcoString>,
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}
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-1
compiler-core/src/snapshots/gleam_core__config__barebones_package_config_to_json.snap
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compiler-core/src/snapshots/gleam_core__config__barebones_package_config_to_json.snap
···
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---
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source: compiler-core/src/config.rs
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assertion_line: 1116
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assertion_line: 1187
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expression: output
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snapshot_kind: text
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---
···
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"links": [],
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"erlang": {
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"application_start_module": null,
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"application_start_argument": null,
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"extra_applications": []
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},
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"javascript": {
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compiler-core/src/snapshots/gleam_core__config__package_config_to_json.snap
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compiler-core/src/snapshots/gleam_core__config__package_config_to_json.snap
···
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---
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source: compiler-core/src/config.rs
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assertion_line: 1106
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assertion_line: 1171
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expression: output
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snapshot_kind: text
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---
···
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],
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"erlang": {
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"application_start_module": "my_app/application",
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"application_start_argument": null,
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"extra_applications": [
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"inets",
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"ssl"
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compiler-core/src/snapshots/gleam_core__docs__barebones_package_config_to_json.snap
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compiler-core/src/snapshots/gleam_core__docs__barebones_package_config_to_json.snap
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-1
compiler-core/src/snapshots/gleam_core__docs__package_config_to_json.snap
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compiler-core/src/snapshots/gleam_core__docs__package_config_to_json.snap
···
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---
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source: compiler-core/src/docs.rs
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assertion_line: 765
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assertion_line: 769
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expression: output
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snapshot_kind: text
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---
···
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],
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"erlang": {
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"application_start_module": "my_app/application",
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"application_start_argument": null,
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"extra_applications": [
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"inets",
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"ssl"
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test-package-compiler/cases/erlang_app_generation_with_argument/gleam.toml
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test-package-compiler/cases/erlang_app_generation_with_argument/gleam.toml
···
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# This config file has a bunch of properties that will be entered into the
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# Erlang .app file
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name = "my_erlang_application" # <-
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version = "0.1.0" # <-
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description = "It's very cool" # <-
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target = "erlang"
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[erlang]
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extra_applications = ["inets", "ssl"] # <-
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application_start_module = "my_erlang_application_sup" # <-
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application_start_argument = "[1, two]" # <-
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[dependencies] # <-
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gleam_stdlib = "~> 1337.0"
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gleam_otp = "~> 1337.0"
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[dev-dependencies] # <-
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midas = "~> 1337.0"
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simple_json = "~> 1337.0"
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+1
test-package-compiler/cases/erlang_app_generation_with_argument/src/main.gleam
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test-package-compiler/cases/erlang_app_generation_with_argument/src/main.gleam
···
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test-package-compiler/src/generated_tests.rs
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test-package-compiler/src/generated_tests.rs
···
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#[rustfmt::skip]
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#[test]
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fn erlang_app_generation_with_argument() {
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let output = crate::prepare("./cases/erlang_app_generation_with_argument");
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insta::assert_snapshot!(
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"erlang_app_generation_with_argument",
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output,
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"./cases/erlang_app_generation_with_argument",
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);
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}
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#[rustfmt::skip]
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#[test]
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fn erlang_bug_752() {
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let output = crate::prepare("./cases/erlang_bug_752");
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insta::assert_snapshot!(
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test-package-compiler/src/snapshots/test_package_compiler__generated_tests__erlang_app_generation_with_argument.snap
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test-package-compiler/src/snapshots/test_package_compiler__generated_tests__erlang_app_generation_with_argument.snap
···
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---
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source: test-package-compiler/src/generated_tests.rs
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assertion_line: 74
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expression: "./cases/erlang_app_generation_with_argument"
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snapshot_kind: text
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---
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//// /out/lib/the_package/_gleam_artefacts/main.cache
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<.cache binary>
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//// /out/lib/the_package/_gleam_artefacts/main.cache_inline
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<8 byte binary>
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//// /out/lib/the_package/_gleam_artefacts/main.cache_meta
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<57 byte binary>
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//// /out/lib/the_package/_gleam_artefacts/main.erl
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-module(main).
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//// /out/lib/the_package/ebin/my_erlang_application.app
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{application, my_erlang_application, [
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{mod, {'my_erlang_application_sup', [1, two]}},
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{vsn, "0.1.0"},
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{applications, [gleam_otp,
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gleam_stdlib,
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inets,
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midas,
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simple_json,
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ssl]},
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{description, "It's very cool"},
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{modules, [main]},
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{registered, []}
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]}.