Meta: Port recent changes to the GN build

2ce61fe6ea

Meta/gn/secondary/Meta/Lagom/Tools/CodeGenerators/LibTextCodec/BUILD.gn

@@ -0,0 +1,6 @@
+import("//Meta/Lagom/Tools/lagom_tool.gni")
+
+lagom_tool("GenerateEncodingIndexes") {
+  sources = [ "GenerateEncodingIndexes.cpp" ]
+  deps = [ "//Userland/Libraries/LibMain" ]
+}

Meta/gn/secondary/Userland/Libraries/LibTextCodec/BUILD.gn

@@ -1,9 +1,35 @@
+import("//Meta/gn/build/compiled_action.gni")
+
+compiled_action("generate_encoding_indexes") {
+  tool =
+      "//Meta/Lagom/Tools/CodeGenerators/LibTextCodec:GenerateEncodingIndexes"
+
+  outputs = [
+    "$target_gen_dir/LookupTables.h",
+    "$target_gen_dir/LookupTables.cpp",
+  ]
+
+  args = [
+    "-h",
+    rebase_path(outputs[0], root_build_dir),
+    "-c",
+    rebase_path(outputs[1], root_build_dir),
+    "-j",
+    rebase_path("//Userland/Libraries/LibTextCodec/indexes.json"),
+  ]
+}
+
 shared_library("LibTextCodec") {
   output_name = "textcodec"
-  include_dirs = [ "//Userland/Libraries" ]
+  include_dirs = [
+    "//Userland/Libraries",
+    "$target_gen_dir/..",
+  ]
   deps = [
+    ":generate_encoding_indexes",
     "//AK",
     "//Userland/Libraries/LibUnicode",
   ]
   sources = [ "Decoder.cpp" ]
+  sources += get_target_outputs(":generate_encoding_indexes")
 }