Add support for Gleam language.

examples/gleam/.test.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+set -ex
+gleam --version

examples/gleam/devenv.nix

@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+{
+  # https://devenv.sh/languages/
+  languages.gleam.enable = true;
+
+  enterShell = ''
+    gleam --version
+  '';
+
+  # See full reference at https://devenv.sh/reference/options/
+}

examples/gleam/devenv.yaml

@@ -0,0 +1,15 @@
+inputs:
+  nixpkgs:
+    url: github:NixOS/nixpkgs/nixpkgs-unstable
+
+  gleam:
+    url: github:gleam-lang/gleam/v0.28.3 # or any other release
+    flake: false
+
+  gleam-nix:
+    url: github:vic/gleam-nix
+    overlays:
+      - default
+    inputs:
+      gleam:
+        follows: gleam

examples/supported-languages/devenv.nix

@@ -14,6 +14,7 @@
   languages.elm.enable = true;
   languages.erlang.enable = true;
   languages.gawk.enable = true;
+  languages.gleam.enable = true;
   languages.go.enable = true;
   languages.haskell.enable = true;
   languages.java.enable = true;

src/modules/languages/gleam.nix

@@ -0,0 +1,51 @@
+{ pkgs, config, lib, inputs, ... }:
+
+let
+  cfg = config.languages.gleam;
+
+  setup = ''
+    To use gleam, you need to add the following to your devenv.yaml:
+
+      inputs:
+         gleam-nix:
+           url: github:vic/gleam-nix
+           overlays:
+             - default
+
+
+    Optionally, if you want a specific gleam branch or version, do
+    the following:
+
+      inputs:
+        gleam:
+           url: github:gleam-lang/gleam/main # or any other branch
+           flake: false
+        gleam-nix:
+           url: github:vic/gleam-nix
+           overlays:
+             - default
+           inputs:
+             gleam = "gleam"
+  '';
+
+  gleamPkg = pkgs.gleam or (throw setup);
+
+in
+{
+  options.languages.gleam = {
+    enable = lib.mkEnableOption "tools for Gleam development";
+
+    package = lib.mkOption {
+      type = lib.types.package;
+      default = gleamPkg;
+      description = "The Gleam package to use.";
+      defaultText = lib.literalExpression "pkgs.gleam";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    packages = [
+      cfg.package
+    ];
+  };
+}