Asterius toolchains declaration.

WORKSPACE

@@ -38,6 +38,7 @@ haskell_cabal_binary(
 
 load(
     "@rules_haskell//:constants.bzl",
+    "test_asterius_version",
     "test_ghc_version",
     "test_stack_snapshot",
 )
@@ -271,6 +272,25 @@ haskell_register_ghc_nixpkgs(
     version = test_ghc_version,
 )
 
+load(
+    "//haskell/asterius:repositories.bzl",
+    "asterius_dependencies_bindist",
+    "asterius_dependencies_nix",
+    "rules_haskell_asterius_toolchains",
+)
+
+(asterius_dependencies_nix(
+    nix_repository = "@nixpkgs_default",
+    nixpkgs_package_rule = nixpkgs_package,
+) if is_nix_shell else asterius_dependencies_bindist())
+
+rules_haskell_asterius_toolchains(
+    cabalopts = test_cabalopts,
+    ghcopts = test_ghcopts,
+    repl_ghci_args = test_repl_ghci_args,
+    version = test_asterius_version,
+)
+
 load(
     "@rules_haskell//haskell:ghc_bindist.bzl",
     "haskell_register_ghc_bindists",
@@ -460,17 +480,6 @@ maybe(
     urls = ["https://github.com/bazelbuild/rules_nodejs/releases/download/3.6.0/rules_nodejs-3.6.0.tar.gz"],
 )
 
-load(
-    "//haskell/asterius:asterius_repositories.bzl",
-    "asterius_dependencies_bindist",
-    "asterius_dependencies_nix",
-)
-
-(asterius_dependencies_nix(
-    nix_repository = "@nixpkgs_default",
-    nixpkgs_package_rule = nixpkgs_package,
-) if is_nix_shell else asterius_dependencies_bindist())
-
 http_archive(
     name = "io_bazel_rules_sass",
     sha256 = "86f734253cb2480acab150f37eb6c5952f33ed463182f77eedf2e41ba2fe2e8f",

constants.bzl

@@ -1,2 +1,3 @@
 test_ghc_version = "8.10.4"
 test_stack_snapshot = "lts-18.0"
+test_asterius_version = "0.0.1"

haskell/asterius/BUILD.bazel

@@ -4,6 +4,24 @@ bzl_library(
     name = "asterius_bzl",
     srcs = [
         "asterius_config.bzl",
+        "repositories.bzl",
     ],
     visibility = ["//haskell:__pkg__"],
+    deps = [
+        "//haskell/platforms",
+    ],
+)
+
+platform(
+    name = "asterius_platform",
+    constraint_values = [
+        "@platforms//cpu:wasm32",
+    ],
+)
+
+# Toolchain type for asterius specific tools such as ahc-dist,
+# which are not part of the regular haskell toolchain.
+toolchain_type(
+    name = "toolchain_type",
+    visibility = ["//visibility:public"],
 )

haskell/asterius/asterius_config.bzl

@@ -1,3 +1,21 @@
+# From the asterius/cabal/config file of asterius and ahc-cabal.hs
+asterius_cabalopts = [
+    "--enable-library-vanilla",
+    "--disable-executable-dynamic",
+    "--disable-profiling",
+    "-O 2",
+    "--disable-debug-info",
+    "--disable-library-for-ghci",
+    "--disable-split-sections",
+    "--disable-split-objs",
+    "--disable-executable-stripping",
+    "--disable-library-stripping",
+    "--disable-tests",
+    "--disable-coverage",
+    "--disable-benchmarks",
+    "--hsc2hs-options=--cross-compile",
+]
+
 # asterius equivalents of tools from the haskell toolchain.
 ASTERIUS_BINARIES = {
     "ahc": "ghc",

haskell/asterius/asterius_repositories.bzl → haskell/asterius/asterius_dependencies.bzl

@@ -75,7 +75,7 @@ def asterius_dependencies_nix(
       nixpkgs_package_rule: The `nixpkgs_package` rule from `rules_nixpkgs`.
       package_json: The package.json file that will be passed to [yarn_install](https://bazelbuild.github.io/rules_nodejs/Built-ins.html#yarn_install)
       yarn_lock: The yarn.lock file that will be passed to [yarn_install](https://bazelbuild.github.io/rules_nodejs/Built-ins.html#yarn_install)
-      nixpkgs_nodejs = The name for the nodejs that will be installed with `nixpkgs_package`.
+      nixpkgs_nodejs: The name for the nodejs that will be installed with `nixpkgs_package`.
     """
     _nixpkgs_nodejs(nixpkgs_nodejs, nix_repository, nixpkgs_package_rule)
     node_repositories(

haskell/asterius/defs.bzl

@@ -0,0 +1,33 @@
+load("@bazel_skylib//lib:paths.bzl", "paths")
+
+def _asterius_toolchain_impl(ctx):
+    ahc_dist = None
+    for file in ctx.files.binaries:
+        basename_no_ext = paths.split_extension(file.basename)[0]
+        if basename_no_ext == "ahc-dist":
+            ahc_dist = file
+    if ahc_dist == None:
+        fail("ahc-dist was not found when defining the asterius toolchain")
+
+    return [
+        platform_common.ToolchainInfo(
+            name = ctx.label.name,
+            ahc_dist = ahc_dist,
+            tools = ctx.files.tools,
+        ),
+    ]
+
+asterius_toolchain = rule(
+    _asterius_toolchain_impl,
+    attrs = {
+        "binaries": attr.label_list(
+            mandatory = True,
+            doc = "The asterius top level wrappers",
+        ),
+        "tools": attr.label_list(
+            mandatory = True,
+            doc = "The complete asterius bundle, which is needed to execute the wrappers.",
+        ),
+    },
+    doc = "Toolchain for asterius tools that are not part of the regular haskell toolchain",
+)