cleanup: Use apigen to generate the FFI code.

Author: iphydf

Diff for: BUILD.bazel

@@ -4,9 +4,24 @@ load("//tools/project:build_defs.bzl", "project")
 
 project()
 
+[genrule(
+    name = "api_" + src[:-2].replace("/", "_"),
+    srcs = ["//c-toxcore:" + src],
+    outs = ["src/FFI/%s.hs" % "/".join([mod.capitalize() for mod in src[:-2].split("/")])],
+    cmd = "$(location //hs-apigen/tools:apigen) -hs $< > $@",
+    exec_tools = ["//hs-apigen/tools:apigen"],
+) for src in [
+    "tox/tox.h",
+]]
+
 haskell_library(
     name = "hs-toxcore-c",
-    srcs = glob(["src/**/*.*hs"]),
+    srcs = glob(
+        ["src/**/*.*hs"],
+        exclude = ["src/FFI/**"],
+    ) + [
+        ":api_tox_tox",
+    ],
     src_strip_prefix = "src",
     version = "0.2.12",
     visibility = ["//visibility:public"],

Diff for: tools/BUILD.bazel

@@ -3,6 +3,7 @@ load("@rules_haskell//haskell:defs.bzl", "haskell_binary")
 haskell_binary(
     name = "groupbot",
     srcs = ["groupbot.hs"],
+    visibility = ["//tools/haskell:__pkg__"],
     deps = [
         "//hs-toxcore-c",
         "//third_party/haskell:base",