sbt: allow managing the ~/.sbt/repositories file

sbt allows overriding the default repositories to use to resolve
dependencies. This is often used with proxies and/or private
repositories to host internal packages.

This change adds a `repositories` attribute to `sbt` to allow
specifying the values that will go in `~/.sbt/repositories` file.

To support the above change we also deprecate the `baseConfigPath`
option in favour of `baseUserConfigPath` which points one level higher
by default. This allows not using relative paths to refer to the
top-level configuration directory.

Also adds tests for the new option and the deprecation of the previous
one.

tests/modules/programs/sbt/default.nix

@@ -1,4 +1,7 @@
 {
-  sbt-plugins = ./plugins.nix;
   sbt-credentials = ./credentials.nix;
+  sbt-deprecated-options = ./deprecated-options.nix;
+  sbt-plugins = ./plugins.nix;
+  sbt-repositories = ./repositories.nix;
+  sbt-user-config-path = ./user-config-path.nix;
 }

tests/modules/programs/sbt/deprecated-options.nix

@@ -0,0 +1,18 @@
+{ ... }:
+
+{
+  programs.sbt = {
+    enable = true;
+    baseConfigPath = "gone";
+  };
+
+  test.stubs.sbt = { };
+
+  test.asserts.assertions.expected = [
+    (let offendingFile = toString ./deprecated-options.nix;
+    in ''
+      The option definition `programs.sbt.baseConfigPath' in `${offendingFile}' no longer has any effect; please remove it.
+      Use programs.sbt.baseUserConfigPath instead, but note that the semantics are slightly different.
+    '')
+  ];
+}

tests/modules/programs/sbt/repositories.nix

@@ -0,0 +1,38 @@
+{ pkgs, ... }:
+
+let
+  repositories = [
+    "local"
+    { my-maven-proxy = "http://repo.mavenproxy.io/a/b/c/d"; }
+    "maven-local"
+    {
+      my-ivy-proxy =
+        "http://repo.company.com/ivy-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]";
+    }
+    "maven-central"
+  ];
+
+  expectedRepositories = builtins.toFile "repositories" ''
+    [repositories]
+    local
+    my-maven-proxy: http://repo.mavenproxy.io/a/b/c/d
+    maven-local
+    my-ivy-proxy: http://repo.company.com/ivy-releases/, [organization]/[module]/(scala_[scalaVersion]/)(sbt_[sbtVersion]/)[revision]/[type]s/[artifact](-[classifier]).[ext]
+    maven-central
+  '';
+
+  repositoriesSbtPath = ".sbt/repositories";
+in {
+  config = {
+    programs.sbt = {
+      enable = true;
+      repositories = repositories;
+      package = pkgs.writeScriptBin "sbt" "";
+    };
+
+    nmt.script = ''
+      assertFileExists "home-files/${repositoriesSbtPath}"
+      assertFileContent "home-files/${repositoriesSbtPath}" "${expectedRepositories}"
+    '';
+  };
+}

tests/modules/programs/sbt/user-config-path.nix

@@ -0,0 +1,39 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  plugins = [{
+    org = "a";
+    artifact = "b";
+    version = "c";
+  }];
+
+  credentials = [{
+    realm = "a";
+    host = "b";
+    user = "c";
+    passwordCommand = "d";
+  }];
+
+  repositories = [ "local" ];
+
+  baseSbtPath = ".config/sbt";
+in {
+  config = {
+    programs.sbt = {
+      enable = true;
+      plugins = plugins;
+      credentials = credentials;
+      repositories = repositories;
+      baseUserConfigPath = ".config/sbt";
+      package = pkgs.writeScriptBin "sbt" "";
+    };
+
+    nmt.script = ''
+      assertFileExists "home-files/${baseSbtPath}/1.0/plugins/plugins.sbt"
+      assertFileExists "home-files/${baseSbtPath}/1.0/credentials.sbt"
+      assertFileExists "home-files/${baseSbtPath}/repositories"
+    '';
+  };
+}